diff --git a/src/xenia/app/emulator_window.cc b/src/xenia/app/emulator_window.cc
index e06b2830e..fe7c38a92 100644
--- a/src/xenia/app/emulator_window.cc
+++ b/src/xenia/app/emulator_window.cc
@@ -294,7 +294,7 @@ void EmulatorWindow::FileDrop(const std::filesystem::path& filename) {
   auto result = emulator_->LaunchPath(filename);
   if (XFAILED(result)) {
     // TODO: Display a message box.
-    XELOGE("Failed to launch target: %.8X", result);
+    XELOGE("Failed to launch target: {:08X}", result);
   }
 }
 
@@ -326,7 +326,7 @@ void EmulatorWindow::FileOpen() {
     auto result = emulator_->LaunchPath(abs_path);
     if (XFAILED(result)) {
       // TODO: Display a message box.
-      XELOGE("Failed to launch target: %.8X", result);
+      XELOGE("Failed to launch target: {:08X}", result);
     }
   }
 }
diff --git a/src/xenia/app/xenia_main.cc b/src/xenia/app/xenia_main.cc
index 4c1d81e6e..a341bc427 100644
--- a/src/xenia/app/xenia_main.cc
+++ b/src/xenia/app/xenia_main.cc
@@ -226,7 +226,7 @@ int xenia_main(const std::vector<std::string>& args) {
     }
   }
   storage_root = std::filesystem::absolute(storage_root);
-  XELOGI("Storage root: %S", storage_root.c_str());
+  XELOGI("Storage root: {}", xe::path_to_utf8(storage_root));
 
   config::SetupConfig(storage_root);
 
@@ -235,7 +235,7 @@ int xenia_main(const std::vector<std::string>& args) {
     content_root = storage_root / "content";
   }
   content_root = std::filesystem::absolute(content_root);
-  XELOGI("Content root: %S", content_root.c_str());
+  XELOGI("Content root: {}", xe::path_to_utf8(content_root));
 
   if (cvars::discord) {
     discord::DiscordPresence::Initialize();
@@ -254,7 +254,7 @@ int xenia_main(const std::vector<std::string>& args) {
       emulator->Setup(emulator_window->window(), CreateAudioSystem,
                       CreateGraphicsSystem, CreateInputDrivers);
   if (XFAILED(result)) {
-    XELOGE("Failed to setup emulator: %.8X", result);
+    XELOGE("Failed to setup emulator: {:08X}", result);
     return 1;
   }
 
diff --git a/src/xenia/apu/sdl/sdl_audio_driver.cc b/src/xenia/apu/sdl/sdl_audio_driver.cc
index 12a7da021..aa42d8a04 100644
--- a/src/xenia/apu/sdl/sdl_audio_driver.cc
+++ b/src/xenia/apu/sdl/sdl_audio_driver.cc
@@ -40,7 +40,7 @@ bool SDLAudioDriver::Initialize() {
     if ((ver.major < 2) ||
         (ver.major == 2 && ver.minor == 0 && ver.patch < 8)) {
       XELOGW(
-          "SDL library version %d.%d.%d is outdated. "
+          "SDL library version {}.{}.{} is outdated. "
           "You may experience choppy audio.",
           ver.major, ver.minor, ver.patch);
     }
diff --git a/src/xenia/apu/xaudio2/xaudio2_audio_driver.cc b/src/xenia/apu/xaudio2/xaudio2_audio_driver.cc
index 4f385126c..4d3ef9c37 100644
--- a/src/xenia/apu/xaudio2/xaudio2_audio_driver.cc
+++ b/src/xenia/apu/xaudio2/xaudio2_audio_driver.cc
@@ -95,7 +95,7 @@ bool XAudio2AudioDriver::Initialize() {
     }
     hr = xaudio2_create(&objects_.api_2_8.audio, 0, processor);
     if (FAILED(hr)) {
-      XELOGE("XAudio2Create failed with %.8X", hr);
+      XELOGE("XAudio2Create failed with {:08X}", hr);
       assert_always();
       return false;
     }
@@ -104,13 +104,13 @@ bool XAudio2AudioDriver::Initialize() {
     hr = CoCreateInstance(__uuidof(api::XAudio2_7), NULL, CLSCTX_INPROC_SERVER,
                           IID_PPV_ARGS(&objects_.api_2_7.audio));
     if (FAILED(hr)) {
-      XELOGE("CoCreateInstance for XAudio2 failed with %.8X", hr);
+      XELOGE("CoCreateInstance for XAudio2 failed with {:08X}", hr);
       assert_always();
       return false;
     }
     hr = objects_.api_2_7.audio->Initialize(0, processor);
     if (FAILED(hr)) {
-      XELOGE("IXAudio2::Initialize failed with %.8X", hr);
+      XELOGE("IXAudio2::Initialize failed with {:08X}", hr);
       assert_always();
       return false;
     }
@@ -133,7 +133,7 @@ bool XAudio2AudioDriver::InitializeObjects(Objects& objects) {
 
   hr = objects.audio->CreateMasteringVoice(&objects.mastering_voice);
   if (FAILED(hr)) {
-    XELOGE("IXAudio2::CreateMasteringVoice failed with %.8X", hr);
+    XELOGE("IXAudio2::CreateMasteringVoice failed with {:08X}", hr);
     assert_always();
     return false;
   }
@@ -171,14 +171,14 @@ bool XAudio2AudioDriver::InitializeObjects(Objects& objects) {
       0,  // api::XE_XAUDIO2_VOICE_NOSRC | api::XE_XAUDIO2_VOICE_NOPITCH,
       api::XE_XAUDIO2_MAX_FREQ_RATIO, voice_callback_);
   if (FAILED(hr)) {
-    XELOGE("IXAudio2::CreateSourceVoice failed with %.8X", hr);
+    XELOGE("IXAudio2::CreateSourceVoice failed with {:08X}", hr);
     assert_always();
     return false;
   }
 
   hr = objects.pcm_voice->Start();
   if (FAILED(hr)) {
-    XELOGE("IXAudio2SourceVoice::Start failed with %.8X", hr);
+    XELOGE("IXAudio2SourceVoice::Start failed with {:08X}", hr);
     assert_always();
     return false;
   }
@@ -231,7 +231,7 @@ void XAudio2AudioDriver::SubmitFrame(uint32_t frame_ptr) {
     hr = objects_.api_2_7.pcm_voice->SubmitSourceBuffer(&buffer);
   }
   if (FAILED(hr)) {
-    XELOGE("SubmitSourceBuffer failed with %.8X", hr);
+    XELOGE("SubmitSourceBuffer failed with {:08X}", hr);
     assert_always();
     return;
   }
diff --git a/src/xenia/apu/xma_context.cc b/src/xenia/apu/xma_context.cc
index 2fd40a928..16d6e66a8 100644
--- a/src/xenia/apu/xma_context.cc
+++ b/src/xenia/apu/xma_context.cc
@@ -119,7 +119,7 @@ void XmaContext::Enable() {
   auto context_ptr = memory()->TranslateVirtual(guest_ptr());
   XMA_CONTEXT_DATA data(context_ptr);
 
-  XELOGAPU("XmaContext: kicking context %d (buffer %d %d/%d bits)", id(),
+  XELOGAPU("XmaContext: kicking context {} (buffer {} {}/{} bits)", id(),
            data.current_buffer, data.input_buffer_read_offset,
            (data.current_buffer == 0 ? data.input_buffer_0_packet_count
                                      : data.input_buffer_1_packet_count) *
@@ -143,7 +143,7 @@ bool XmaContext::Block(bool poll) {
 
 void XmaContext::Clear() {
   std::lock_guard<std::mutex> lock(lock_);
-  XELOGAPU("XmaContext: reset context %d", id());
+  XELOGAPU("XmaContext: reset context {}", id());
 
   auto context_ptr = memory()->TranslateVirtual(guest_ptr());
   XMA_CONTEXT_DATA data(context_ptr);
@@ -160,7 +160,7 @@ void XmaContext::Clear() {
 
 void XmaContext::Disable() {
   std::lock_guard<std::mutex> lock(lock_);
-  XELOGAPU("XmaContext: disabling context %d", id());
+  XELOGAPU("XmaContext: disabling context {}", id());
   set_is_enabled(false);
 }
 
@@ -323,7 +323,7 @@ void XmaContext::DecodePackets(XMA_CONTEXT_DATA* data) {
                      : nullptr;
   uint8_t* current_input_buffer = data->current_buffer ? in1 : in0;
 
-  XELOGAPU("Processing context %d (offset %d, buffer %d, ptr %.8X)", id(),
+  XELOGAPU("Processing context {} (offset {}, buffer {}, ptr {:p})", id(),
            data->input_buffer_read_offset, data->current_buffer,
            current_input_buffer);
 
@@ -392,7 +392,7 @@ void XmaContext::DecodePackets(XMA_CONTEXT_DATA* data) {
 
     if (!ValidFrameOffset(current_input_buffer, current_input_size,
                           data->input_buffer_read_offset)) {
-      XELOGAPU("XmaContext %d: Invalid read offset %d!", id(),
+      XELOGAPU("XmaContext {}: Invalid read offset {}!", id(),
                data->input_buffer_read_offset);
       if (data->current_buffer == 0) {
         data->current_buffer = 1;
@@ -441,7 +441,7 @@ void XmaContext::DecodePackets(XMA_CONTEXT_DATA* data) {
       }
 
       if (partial_frame_saved_) {
-        XELOGAPU("XmaContext %d: saved a partial frame", id());
+        XELOGAPU("XmaContext {}: saved a partial frame", id());
 
         if (data->current_buffer == 0) {
           data->input_buffer_0_valid = 0;
@@ -485,7 +485,7 @@ void XmaContext::DecodePackets(XMA_CONTEXT_DATA* data) {
     bool partial = false;
     size_t bit_offset = data->input_buffer_read_offset;
     if (partial_frame_saved_) {
-      XELOGAPU("XmaContext %d: processing saved partial frame", id());
+      XELOGAPU("XmaContext {}: processing saved partial frame", id());
       packet_->data = partial_frame_buffer_.data();
       packet_->size = (int)partial_frame_buffer_.size();
 
diff --git a/src/xenia/apu/xma_decoder.cc b/src/xenia/apu/xma_decoder.cc
index 85b6d5b5d..eaf0a8c50 100644
--- a/src/xenia/apu/xma_decoder.cc
+++ b/src/xenia/apu/xma_decoder.cc
@@ -91,7 +91,8 @@ void av_log_callback(void* avcl, int level, const char* fmt, va_list va) {
 
   StringBuffer buff;
   buff.AppendVarargs(fmt, va);
-  xe::LogLineFormat(log_level, level_char, "libav: %s", buff.buffer());
+  xe::logging::AppendLogLineFormat(log_level, level_char, "libav: {}",
+                                   buff.to_string_view());
 }
 
 X_STATUS XmaDecoder::Setup(kernel::KernelState* kernel_state) {
@@ -248,7 +249,7 @@ uint32_t XmaDecoder::ReadRegister(uint32_t addr) {
   switch (r) {
     default: {
       if (!register_file_.GetRegisterInfo(r)) {
-        XELOGE("XMA: Read from unknown register (%.4X)", r);
+        XELOGE("XMA: Read from unknown register ({:04X})", r);
       }
     }
 #pragma warning(suppress : 4065)
@@ -285,7 +286,7 @@ void XmaDecoder::WriteRegister(uint32_t addr, uint32_t value) {
   } else {
     switch (r) {
       default: {
-        XELOGE("XMA: Write to unhandled register (%.4X): %.8X", r, value);
+        XELOGE("XMA: Write to unhandled register ({:04X}): {:08X}", r, value);
         break;
       }
 #pragma warning(suppress : 4065)
diff --git a/src/xenia/base/debugging.h b/src/xenia/base/debugging.h
index a65b67f26..b0a99913c 100644
--- a/src/xenia/base/debugging.h
+++ b/src/xenia/base/debugging.h
@@ -12,6 +12,8 @@
 
 #include <cstdint>
 
+#include "third_party/fmt/include/fmt/format.h"
+
 namespace xe {
 namespace debugging {
 
@@ -25,10 +27,18 @@ bool IsDebuggerAttached();
 // If no debugger is present, a signal will be raised.
 void Break();
 
+namespace internal {
+void DebugPrint(const char* s);
+}
+
 // Prints a message to the attached debugger.
 // This bypasses the normal logging mechanism. If no debugger is attached it's
 // likely to no-op.
-void DebugPrint(const char* fmt, ...);
+template <typename... Args>
+void DebugPrint(fmt::string_view format, const Args&... args) {
+  internal::DebugPrint(
+      fmt::vformat(format, fmt::make_format_args(args...)).c_str());
+}
 
 }  // namespace debugging
 }  // namespace xe
diff --git a/src/xenia/base/debugging_posix.cc b/src/xenia/base/debugging_posix.cc
index 32d212d60..a9c08ed60 100644
--- a/src/xenia/base/debugging_posix.cc
+++ b/src/xenia/base/debugging_posix.cc
@@ -20,16 +20,11 @@ namespace debugging {
 bool IsDebuggerAttached() { return false; }
 void Break() { raise(SIGTRAP); }
 
-void DebugPrint(const char* fmt, ...) {
-  StringBuffer buff;
-
-  va_list va;
-  va_start(va, fmt);
-  buff.AppendVarargs(fmt, va);
-  va_end(va);
-
-  // OutputDebugStringA(buff.GetString());
+namespace internal {
+void DebugPrint(const char* s) {
+  // TODO: proper implementation.
 }
+}  // namespace internal
 
 }  // namespace debugging
 }  // namespace xe
diff --git a/src/xenia/base/debugging_win.cc b/src/xenia/base/debugging_win.cc
index d6b468772..fbe269fb2 100644
--- a/src/xenia/base/debugging_win.cc
+++ b/src/xenia/base/debugging_win.cc
@@ -19,16 +19,9 @@ bool IsDebuggerAttached() { return IsDebuggerPresent() ? true : false; }
 
 void Break() { __debugbreak(); }
 
-void DebugPrint(const char* fmt, ...) {
-  StringBuffer buff;
-
-  va_list va;
-  va_start(va, fmt);
-  buff.AppendVarargs(fmt, va);
-  va_end(va);
-
-  OutputDebugStringA(buff.GetString());
-}
+namespace internal {
+void DebugPrint(const char* s) { OutputDebugStringA(s); }
+}  // namespace internal
 
 }  // namespace debugging
 }  // namespace xe
diff --git a/src/xenia/base/filesystem_win.cc b/src/xenia/base/filesystem_win.cc
index 6bbc11577..c2cf6d54a 100644
--- a/src/xenia/base/filesystem_win.cc
+++ b/src/xenia/base/filesystem_win.cc
@@ -160,7 +160,7 @@ class Win32FileHandle : public FileHandle {
     } else {
       if (GetLastError() == ERROR_NOACCESS) {
         XELOGW(
-            "Win32FileHandle::Read(..., %.8llX, %.8llX, ...) returned "
+            "Win32FileHandle::Read(..., {}, {:#X}, ...) returned "
             "ERROR_NOACCESS. Read-only memory?",
             buffer, buffer_length);
       }
diff --git a/src/xenia/base/logging.cc b/src/xenia/base/logging.cc
index 5e13810ad..aa688c87e 100644
--- a/src/xenia/base/logging.cc
+++ b/src/xenia/base/logging.cc
@@ -10,12 +10,13 @@
 #include "xenia/base/logging.h"
 
 #include <atomic>
-#include <cinttypes>
-#include <cstdarg>
-#include <cstdlib>
 #include <mutex>
 #include <vector>
 
+#include "third_party/disruptorplus/include/disruptorplus/multi_threaded_claim_strategy.hpp"
+#include "third_party/disruptorplus/include/disruptorplus/ring_buffer.hpp"
+#include "third_party/disruptorplus/include/disruptorplus/sequence_barrier.hpp"
+#include "third_party/disruptorplus/include/disruptorplus/spin_wait_strategy.hpp"
 #include "xenia/base/atomic.h"
 #include "xenia/base/cvar.h"
 #include "xenia/base/debugging.h"
@@ -47,16 +48,34 @@ DEFINE_int32(
     "Maximum level to be logged. (0=error, 1=warning, 2=info, 3=debug)",
     "Logging");
 
+namespace dp = disruptorplus;
+
 namespace xe {
 
 class Logger;
 
 Logger* logger_ = nullptr;
-thread_local std::vector<char> log_format_buffer_(64 * 1024);
+
+struct LogLine {
+  size_t buffer_length;
+  uint32_t thread_id;
+  uint16_t _pad_0;  // (2b) padding
+  uint8_t _pad_1;   // (1b) padding
+  char prefix_char;
+};
+
+thread_local char thread_log_buffer_[64 * 1024];
 
 class Logger {
  public:
-  explicit Logger(const std::string_view app_name) : running_(true) {
+  explicit Logger(const std::string_view app_name)
+      : file_(nullptr),
+        running_(true),
+        wait_strategy_(),
+        claim_strategy_(kBlockCount, wait_strategy_),
+        consumed_(wait_strategy_) {
+    claim_strategy_.add_claim_barrier(consumed_);
+
     if (cvars::log_file.empty()) {
       // Default to app name.
       auto file_name = fmt::format("{}.log", app_name);
@@ -84,165 +103,189 @@ class Logger {
     fclose(file_);
   }
 
-  void AppendLine(uint32_t thread_id, LogLevel level, const char prefix_char,
-                  const char* buffer, size_t buffer_length) {
-    if (static_cast<int32_t>(level) > cvars::log_level) {
-      // Discard this line.
-      return;
-    }
-
-    LogLine line;
-    line.buffer_length = buffer_length;
-    line.thread_id = thread_id;
-    line.prefix_char = prefix_char;
-
-    // First, run a check and see if we can increment write
-    // head without any problems. If so, cmpxchg it to reserve some space in the
-    // ring. If someone beats us, loop around.
-    //
-    // Once we have a reservation, write our data and then increment the write
-    // tail.
-    size_t size = sizeof(LogLine) + buffer_length;
-    while (true) {
-      // Attempt to make a reservation.
-      size_t write_head = write_head_;
-      size_t read_head = read_head_;
-
-      RingBuffer rb(buffer_, kBufferSize);
-      rb.set_write_offset(write_head);
-      rb.set_read_offset(read_head);
-      if (rb.write_count() < size) {
-        xe::threading::MaybeYield();
-        continue;
-      }
-
-      // We have enough size to make a reservation!
-      rb.AdvanceWrite(size);
-      if (xe::atomic_cas(write_head, rb.write_offset(), &write_head_)) {
-        // Reservation made. Write out logline.
-        rb.set_write_offset(write_head);
-        rb.Write(&line, sizeof(LogLine));
-        rb.Write(buffer, buffer_length);
-
-        while (!xe::atomic_cas(write_head, rb.write_offset(), &write_tail_)) {
-          // Done writing. End the reservation.
-          xe::threading::MaybeYield();
-        }
-
-        break;
-      } else {
-        // Someone beat us to the chase. Loop around.
-        continue;
-      }
-    }
-  }
-
  private:
   static const size_t kBufferSize = 8 * 1024 * 1024;
+  uint8_t buffer_[kBufferSize];
 
-  struct LogLine {
-    size_t buffer_length;
-    uint32_t thread_id;
-    uint16_t _pad_0;  // (2b) padding
-    uint8_t _pad_1;   // (1b) padding
-    char prefix_char;
-  };
+  static const size_t kBlockSize = 256;
+  static const size_t kBlockCount = kBufferSize / kBlockSize;
+  static const size_t kBlockIndexMask = kBlockCount - 1;
+
+  static const size_t kClaimStrategyFootprint =
+      sizeof(std::atomic<dp::sequence_t>[kBlockCount]);
+
+  static size_t BlockOffset(dp::sequence_t sequence) {
+    return (sequence & kBlockIndexMask) * kBlockSize;
+  }
+
+  static size_t BlockCount(size_t byte_size) {
+    return (byte_size + (kBlockSize - 1)) / kBlockSize;
+  }
+
+  dp::spin_wait_strategy wait_strategy_;
+  dp::multi_threaded_claim_strategy<dp::spin_wait_strategy> claim_strategy_;
+  dp::sequence_barrier<dp::spin_wait_strategy> consumed_;
+
+  FILE* file_;
+
+  std::atomic<bool> running_;
+  std::unique_ptr<xe::threading::Thread> write_thread_;
 
   void Write(const char* buf, size_t size) {
     if (file_) {
       fwrite(buf, 1, size, file_);
     }
-
     if (cvars::log_to_debugprint) {
-      debugging::DebugPrint("%.*s", size, buf);
+      debugging::DebugPrint("{}", std::string_view(buf, size));
     }
   }
 
   void WriteThread() {
     RingBuffer rb(buffer_, kBufferSize);
-    uint32_t idle_loops = 0;
+
+    size_t idle_loops = 0;
+
+    dp::sequence_t next_sequence = 0;
+    dp::sequence_t last_sequence = -1;
+
+    size_t desired_count = 1;
     while (true) {
-      bool did_write = false;
-      rb.set_write_offset(write_tail_);
-      if (!running_ && rb.empty()) {
-        break;
-      }
-      while (!rb.empty()) {
-        did_write = true;
+      // We want one block to find out how many blocks we need or we know how
+      // many blocks needed for at least one log line.
+      auto next_range = dp::sequence_range(next_sequence, desired_count);
 
-        // Read line header and write out the line prefix.
-        LogLine line;
-        rb.Read(&line, sizeof(line));
-        char prefix[] = {
-            line.prefix_char,
-            '>',
-            ' ',
-            '0',  // Thread ID gets placed here (8 chars).
-            '0',
-            '0',
-            '0',
-            '0',
-            '0',
-            '0',
-            '0',
-            ' ',
-            0,
-        };
-        std::snprintf(prefix + 3, sizeof(prefix) - 3, "%08" PRIX32 " ",
-                      line.thread_id);
-        Write(prefix, sizeof(prefix) - 1);
-        if (line.buffer_length) {
-          // Get access to the line data - which may be split in the ring buffer
-          // - and write it out in parts.
-          auto line_range = rb.BeginRead(line.buffer_length);
-          Write(reinterpret_cast<const char*>(line_range.first),
-                line_range.first_length);
-          if (line_range.second_length) {
-            Write(reinterpret_cast<const char*>(line_range.second),
-                  line_range.second_length);
+      auto available_sequence = claim_strategy_.wait_until_published(
+          next_range.last(), last_sequence);
+
+      auto available_difference =
+          dp::difference(available_sequence, next_sequence);
+
+      size_t read_count = 0;
+
+      if (available_difference > 0 &&
+          static_cast<size_t>(available_difference) >= desired_count) {
+        auto available_range = dp::sequence_range(
+            next_sequence, static_cast<size_t>(available_difference));
+        auto available_count = available_range.size();
+
+        rb.set_write_offset(BlockOffset(available_range.end()));
+
+        for (size_t i = available_range.first(); i != available_range.end();) {
+          rb.set_read_offset(BlockOffset(i));
+
+          LogLine line;
+          rb.Read(&line, sizeof(line));
+
+          auto needed_count = BlockCount(sizeof(LogLine) + line.buffer_length);
+          if (read_count + needed_count > available_count) {
+            // More blocks are needed for a complete line.
+            desired_count = needed_count;
+            break;
+          } else {
+            // Enough blocks to read this log line, advance by that many.
+            read_count += needed_count;
+            i += needed_count;
+
+            char prefix[] = {
+                line.prefix_char,
+                '>',
+                ' ',
+                '?',  // Thread ID gets placed here (8 chars).
+                '?',
+                '?',
+                '?',
+                '?',
+                '?',
+                '?',
+                '?',
+                ' ',
+                0,
+            };
+            fmt::format_to_n(prefix + 3, sizeof(prefix) - 3, "{:08X}",
+                             line.thread_id);
+            Write(prefix, sizeof(prefix) - 1);
+
+            if (line.buffer_length) {
+              // Get access to the line data - which may be split in the ring
+              // buffer - and write it out in parts.
+              auto line_range = rb.BeginRead(line.buffer_length);
+              Write(reinterpret_cast<const char*>(line_range.first),
+                    line_range.first_length);
+              if (line_range.second_length) {
+                Write(reinterpret_cast<const char*>(line_range.second),
+                      line_range.second_length);
+              }
+
+              // Always ensure there is a newline.
+              char last_char =
+                  line_range.second
+                      ? line_range.second[line_range.second_length - 1]
+                      : line_range.first[line_range.first_length - 1];
+              if (last_char != '\n') {
+                const char suffix[1] = {'\n'};
+                Write(suffix, 1);
+              }
+
+              rb.EndRead(std::move(line_range));
+            } else {
+              // Always ensure there is a newline.
+              const char suffix[1] = {'\n'};
+              Write(suffix, 1);
+            }
           }
-          // Always ensure there is a newline.
-          char last_char = line_range.second
-                               ? line_range.second[line_range.second_length - 1]
-                               : line_range.first[line_range.first_length - 1];
-          if (last_char != '\n') {
-            const char suffix[1] = {'\n'};
-            Write(suffix, 1);
-          }
-          rb.EndRead(std::move(line_range));
-        } else {
-          const char suffix[1] = {'\n'};
-          Write(suffix, 1);
         }
-
-        rb.set_write_offset(write_tail_);
-        read_head_ = rb.read_offset();
       }
-      if (did_write) {
+
+      if (read_count) {
+        // Advance by the number of blocks we read.
+        auto read_range = dp::sequence_range(next_sequence, read_count);
+        next_sequence = read_range.end();
+        last_sequence = read_range.last();
+        consumed_.publish(read_range.last());
+
+        desired_count = 1;
+
         if (cvars::flush_log) {
           fflush(file_);
         }
 
         idle_loops = 0;
       } else {
-        if (idle_loops > 1000) {
+        if (!running_) {
+          break;
+        }
+        if (idle_loops >= 1000) {
           // Introduce a waiting period.
           xe::threading::Sleep(std::chrono::milliseconds(50));
+        } else {
+          idle_loops++;
         }
-
-        idle_loops++;
       }
     }
   }
 
-  volatile size_t write_tail_ = 0;
-  size_t write_head_ = 0;
-  size_t read_head_ = 0;
-  uint8_t buffer_[kBufferSize];
-  FILE* file_ = nullptr;
+ public:
+  void AppendLine(uint32_t thread_id, const char prefix_char,
+                  const char* buffer_data, size_t buffer_length) {
+    size_t count = BlockCount(sizeof(LogLine) + buffer_length);
 
-  std::atomic<bool> running_;
-  std::unique_ptr<xe::threading::Thread> write_thread_;
+    auto range = claim_strategy_.claim(count);
+    assert_true(range.size() == count);
+
+    RingBuffer rb(buffer_, kBufferSize);
+    rb.set_write_offset(BlockOffset(range.first()));
+    rb.set_read_offset(BlockOffset(range.end()));
+
+    LogLine line = {};
+    line.buffer_length = buffer_length;
+    line.thread_id = thread_id;
+    line.prefix_char = prefix_char;
+
+    rb.Write(&line, sizeof(LogLine));
+    rb.Write(buffer_data, buffer_length);
+
+    claim_strategy_.publish(range);
+  }
 };
 
 void InitializeLogging(const std::string_view app_name) {
@@ -258,56 +301,34 @@ void ShutdownLogging() {
   memory::AlignedFree(logger);
 }
 
-void LogLineFormat(LogLevel log_level, const char prefix_char, const char* fmt,
-                   ...) {
-  if (!logger_) {
-    return;
-  }
-
-  va_list args;
-  va_start(args, fmt);
-  int chars_written = std::vsnprintf(log_format_buffer_.data(),
-                                     log_format_buffer_.capacity(), fmt, args);
-  va_end(args);
-  if (chars_written >= 0 && chars_written < log_format_buffer_.capacity()) {
-    logger_->AppendLine(xe::threading::current_thread_id(), log_level,
-                        prefix_char, log_format_buffer_.data(), chars_written);
-  } else if (chars_written >= 0) {
-    logger_->AppendLine(xe::threading::current_thread_id(), log_level,
-                        prefix_char, fmt, std::strlen(fmt));
-  }
+bool logging::internal::ShouldLog(LogLevel log_level) {
+  return logger_ != nullptr &&
+         static_cast<int32_t>(log_level) <= cvars::log_level;
 }
 
-void LogLineVarargs(LogLevel log_level, const char prefix_char, const char* fmt,
-                    va_list args) {
-  if (!logger_) {
+std::pair<char*, size_t> logging::internal::GetThreadBuffer() {
+  return {thread_log_buffer_, sizeof(thread_log_buffer_)};
+}
+
+void logging::internal::AppendLogLine(LogLevel log_level,
+                                      const char prefix_char, size_t written) {
+  if (!ShouldLog(log_level) || !written) {
     return;
   }
-
-  int chars_written = std::vsnprintf(log_format_buffer_.data(),
-                                     log_format_buffer_.capacity(), fmt, args);
-  if (chars_written < 0) {
-    return;
-  }
-
-  auto size =
-      std::min(size_t(chars_written), log_format_buffer_.capacity() - 1);
-  logger_->AppendLine(xe::threading::current_thread_id(), log_level,
-                      prefix_char, log_format_buffer_.data(), size);
+  logger_->AppendLine(xe::threading::current_thread_id(), prefix_char,
+                      thread_log_buffer_, written);
 }
 
 void logging::AppendLogLine(LogLevel log_level, const char prefix_char,
                             const std::string_view str) {
-  if (!logger_) {
+  if (!internal::ShouldLog(log_level) || !str.size()) {
     return;
   }
-
-  logger_->AppendLine(xe::threading::current_thread_id(), log_level,
-                      prefix_char, str.data(), str.length());
+  logger_->AppendLine(xe::threading::current_thread_id(), prefix_char,
+                      str.data(), str.size());
 }
 
 void FatalError(const std::string_view str) {
-  LogLine(LogLevel::Error, 'X', str);
   logging::AppendLogLine(LogLevel::Error, 'X', str);
 
 #if XE_PLATFORM_WIN32
diff --git a/src/xenia/base/logging.h b/src/xenia/base/logging.h
index 2ac8182b6..498ccab0f 100644
--- a/src/xenia/base/logging.h
+++ b/src/xenia/base/logging.h
@@ -14,6 +14,7 @@
 #include <cstdint>
 #include <string>
 
+#include "third_party/fmt/include/fmt/format.h"
 #include "xenia/base/string.h"
 
 namespace xe {
@@ -38,42 +39,104 @@ enum class LogLevel {
 void InitializeLogging(const std::string_view app_name);
 void ShutdownLogging();
 
+namespace logging {
+namespace internal {
+
+bool ShouldLog(LogLevel log_level);
+std::pair<char*, size_t> GetThreadBuffer();
+
+void AppendLogLine(LogLevel log_level, const char prefix_char, size_t written);
+
+}  // namespace internal
+
 // Appends a line to the log with printf-style formatting.
-void LogLineFormat(LogLevel log_level, const char prefix_char, const char* fmt,
-                   ...);
-void LogLineVarargs(LogLevel log_level, const char prefix_char, const char* fmt,
-                    va_list args);
+template <typename... Args>
+void AppendLogLineFormat(LogLevel log_level, const char prefix_char,
+                         const char* format, const Args&... args) {
+  if (!internal::ShouldLog(log_level)) {
+    return;
+  }
+  auto target = internal::GetThreadBuffer();
+  auto result = fmt::format_to_n(target.first, target.second, format, args...);
+  internal::AppendLogLine(log_level, prefix_char, result.size);
+}
+
 // Appends a line to the log.
-void LogLine(LogLevel log_level, const char prefix_char, std::string_view str);
+void AppendLogLine(LogLevel log_level, const char prefix_char,
+                   const std::string_view str);
+
+}  // namespace logging
 
 // Logs a fatal error and aborts the program.
 void FatalError(const std::string_view str);
 
-#if XE_OPTION_ENABLE_LOGGING
-#define XELOGCORE(level, prefix, fmt, ...) \
-  xe::LogLineFormat(level, prefix, fmt, ##__VA_ARGS__)
-#else
-#define XELOGCORE(level, fmt, ...) \
-  do {                             \
-  } while (false)
-#endif  // ENABLE_LOGGING
-
-#define XELOGE(fmt, ...) XELOGCORE(xe::LogLevel::Error, '!', fmt, ##__VA_ARGS__)
-#define XELOGW(fmt, ...) \
-  XELOGCORE(xe::LogLevel::Warning, 'w', fmt, ##__VA_ARGS__)
-#define XELOGI(fmt, ...) XELOGCORE(xe::LogLevel::Info, 'i', fmt, ##__VA_ARGS__)
-#define XELOGD(fmt, ...) XELOGCORE(xe::LogLevel::Debug, 'd', fmt, ##__VA_ARGS__)
-
-#define XELOGCPU(fmt, ...) \
-  XELOGCORE(xe::LogLevel::Info, 'C', fmt, ##__VA_ARGS__)
-#define XELOGAPU(fmt, ...) \
-  XELOGCORE(xe::LogLevel::Info, 'A', fmt, ##__VA_ARGS__)
-#define XELOGGPU(fmt, ...) \
-  XELOGCORE(xe::LogLevel::Info, 'G', fmt, ##__VA_ARGS__)
-#define XELOGKERNEL(fmt, ...) \
-  XELOGCORE(xe::LogLevel::Info, 'K', fmt, ##__VA_ARGS__)
-#define XELOGFS(fmt, ...) XELOGCORE(xe::LogLevel::Info, 'F', fmt, ##__VA_ARGS__)
-
 }  // namespace xe
 
+#if XE_OPTION_ENABLE_LOGGING
+
+template <typename... Args>
+void XELOGE(const char* format, const Args&... args) {
+  xe::logging::AppendLogLineFormat(xe::LogLevel::Error, '!', format, args...);
+}
+
+template <typename... Args>
+void XELOGW(const char* format, const Args&... args) {
+  xe::logging::AppendLogLineFormat(xe::LogLevel::Warning, 'w', format, args...);
+}
+
+template <typename... Args>
+void XELOGI(const char* format, const Args&... args) {
+  xe::logging::AppendLogLineFormat(xe::LogLevel::Info, 'i', format, args...);
+}
+
+template <typename... Args>
+void XELOGD(const char* format, const Args&... args) {
+  xe::logging::AppendLogLineFormat(xe::LogLevel::Debug, 'd', format, args...);
+}
+
+template <typename... Args>
+void XELOGCPU(const char* format, const Args&... args) {
+  xe::logging::AppendLogLineFormat(xe::LogLevel::Info, 'C', format, args...);
+}
+
+template <typename... Args>
+void XELOGAPU(const char* format, const Args&... args) {
+  xe::logging::AppendLogLineFormat(xe::LogLevel::Info, 'A', format, args...);
+}
+
+template <typename... Args>
+void XELOGGPU(const char* format, const Args&... args) {
+  xe::logging::AppendLogLineFormat(xe::LogLevel::Info, 'G', format, args...);
+}
+
+template <typename... Args>
+void XELOGKERNEL(const char* format, const Args&... args) {
+  xe::logging::AppendLogLineFormat(xe::LogLevel::Info, 'K', format, args...);
+}
+
+template <typename... Args>
+void XELOGFS(const char* format, const Args&... args) {
+  xe::logging::AppendLogLineFormat(xe::LogLevel::Info, 'F', format, args...);
+}
+
+#else
+
+#define XELOGDUMMY \
+  do {             \
+  } while (false)
+
+#define XELOGE(...) XELOGDUMMY
+#define XELOGW(...) XELOGDUMMY
+#define XELOGI(...) XELOGDUMMY
+#define XELOGD(...) XELOGDUMMY
+#define XELOGCPU(...) XELOGDUMMY
+#define XELOGAPU(...) XELOGDUMMY
+#define XELOGGPU(...) XELOGDUMMY
+#define XELOGKERNEL(...) XELOGDUMMY
+#define XELOGFS(...) XELOGDUMMY
+
+#undef XELOGDUMMY
+
+#endif  // ENABLE_LOGGING
+
 #endif  // XENIA_BASE_LOGGING_H_
diff --git a/src/xenia/base/main_win.cc b/src/xenia/base/main_win.cc
index 503936291..61b40f2d9 100644
--- a/src/xenia/base/main_win.cc
+++ b/src/xenia/base/main_win.cc
@@ -143,8 +143,7 @@ int Main() {
   }
 
   // Print version info.
-  XELOGI("Build: %s / %s on %s", XE_BUILD_BRANCH, XE_BUILD_COMMIT,
-         XE_BUILD_DATE);
+  XELOGI("Build: " XE_BUILD_BRANCH " / " XE_BUILD_COMMIT " on " XE_BUILD_DATE);
 
   // Request high performance timing.
   if (cvars::win32_high_freq) {
diff --git a/src/xenia/base/socket_win.cc b/src/xenia/base/socket_win.cc
index d3e4406ca..35b96d470 100644
--- a/src/xenia/base/socket_win.cc
+++ b/src/xenia/base/socket_win.cc
@@ -50,7 +50,7 @@ class Win32Socket : public Socket {
     int ret =
         getaddrinfo(hostname.c_str(), port_string.c_str(), &hints, &result);
     if (ret != 0) {
-      XELOGE("getaddrinfo failed with error: %d", ret);
+      XELOGE("getaddrinfo failed with error: {}", ret);
       return false;
     }
     SOCKET try_socket = INVALID_SOCKET;
@@ -58,7 +58,7 @@ class Win32Socket : public Socket {
       // Create a SOCKET for connecting to server.
       try_socket = socket(ptr->ai_family, ptr->ai_socktype, ptr->ai_protocol);
       if (try_socket == INVALID_SOCKET) {
-        XELOGE("socket failed with error: %ld", WSAGetLastError());
+        XELOGE("socket failed with error: {}", WSAGetLastError());
         freeaddrinfo(result);
         return false;
       }
@@ -144,7 +144,7 @@ class Win32Socket : public Socket {
         event_->Reset();
         return 0;
       }
-      XELOGE("Socket send error: %d", e);
+      XELOGE("Socket send error: {}", e);
       Close();
       return -1;
     } else if (ret == 0) {
@@ -175,7 +175,7 @@ class Win32Socket : public Socket {
                       buffer_data_sent.data(), 0, nullptr, nullptr);
     if (ret == SOCKET_ERROR) {
       int e = WSAGetLastError();
-      XELOGE("Socket send error: %d", e);
+      XELOGE("Socket send error: {}", e);
       Close();
       return false;
     }
@@ -250,12 +250,12 @@ class Win32SocketServer : public SocketServer {
     if (bind(socket_, reinterpret_cast<sockaddr*>(&socket_addr),
              sizeof(socket_addr)) == SOCKET_ERROR) {
       int e = WSAGetLastError();
-      XELOGE("Unable to bind debug socket: %d", e);
+      XELOGE("Unable to bind debug socket: {}", e);
       return false;
     }
     if (listen(socket_, 5) == SOCKET_ERROR) {
       int e = WSAGetLastError();
-      XELOGE("Unable to listen on accept socket %d", e);
+      XELOGE("Unable to listen on accept socket {}", e);
       return false;
     }
 
diff --git a/src/xenia/base/threading_posix.cc b/src/xenia/base/threading_posix.cc
index 926f4943d..e08074d93 100644
--- a/src/xenia/base/threading_posix.cc
+++ b/src/xenia/base/threading_posix.cc
@@ -437,7 +437,7 @@ std::unique_ptr<Thread> Thread::Create(CreationParameters params,
   if (ret != 0) {
     // TODO(benvanik): pass back?
     auto last_error = errno;
-    XELOGE("Unable to pthread_create: %d", last_error);
+    XELOGE("Unable to pthread_create: {}", last_error);
     delete start_data;
     return nullptr;
   }
diff --git a/src/xenia/base/threading_win.cc b/src/xenia/base/threading_win.cc
index a19482a71..2b59d97f0 100644
--- a/src/xenia/base/threading_win.cc
+++ b/src/xenia/base/threading_win.cc
@@ -450,7 +450,7 @@ std::unique_ptr<Thread> Thread::Create(CreationParameters params,
   if (handle == INVALID_HANDLE_VALUE) {
     // TODO(benvanik): pass back?
     auto last_error = GetLastError();
-    XELOGE("Unable to CreateThread: %d", last_error);
+    XELOGE("Unable to CreateThread: {}", last_error);
     delete start_data;
     return nullptr;
   }
diff --git a/src/xenia/config.cc b/src/xenia/config.cc
index a3e57930f..99cd1be7f 100644
--- a/src/xenia/config.cc
+++ b/src/xenia/config.cc
@@ -61,7 +61,7 @@ void ReadConfig(const std::filesystem::path& file_path) {
       config_var->LoadConfigValue(config->get_qualified(config_key));
     }
   }
-  XELOGI("Loaded config: %s", xe::path_to_utf8(file_path).c_str());
+  XELOGI("Loaded config: {}", xe::path_to_utf8(file_path));
 }
 
 void ReadGameConfig(const std::filesystem::path& file_path) {
@@ -73,7 +73,7 @@ void ReadGameConfig(const std::filesystem::path& file_path) {
       config_var->LoadGameConfigValue(config->get_qualified(config_key));
     }
   }
-  XELOGI("Loaded game config: %s", xe::path_to_utf8(file_path).c_str());
+  XELOGI("Loaded game config: {}", xe::path_to_utf8(file_path));
 }
 
 void SaveConfig() {
diff --git a/src/xenia/cpu/backend/x64/x64_code_cache.cc b/src/xenia/cpu/backend/x64/x64_code_cache.cc
index 6903536af..8f9b433dd 100644
--- a/src/xenia/cpu/backend/x64/x64_code_cache.cc
+++ b/src/xenia/cpu/backend/x64/x64_code_cache.cc
@@ -56,9 +56,10 @@ bool X64CodeCache::Initialize() {
   if (!indirection_table_base_) {
     XELOGE("Unable to allocate code cache indirection table");
     XELOGE(
-        "This is likely because the %.8X-%.8X range is in use by some other "
+        "This is likely because the {:X}-{:X} range is in use by some other "
         "system DLL",
-        kIndirectionTableBase, kIndirectionTableBase + kIndirectionTableSize);
+        static_cast<uint64_t>(kIndirectionTableBase),
+        kIndirectionTableBase + kIndirectionTableSize);
   }
 
   // Create mmap file. This allows us to share the code cache with the debugger.
@@ -79,9 +80,10 @@ bool X64CodeCache::Initialize() {
   if (!generated_code_base_) {
     XELOGE("Unable to allocate code cache generated code storage");
     XELOGE(
-        "This is likely because the %.8X-%.8X range is in use by some other "
+        "This is likely because the {:X}-{:X} range is in use by some other "
         "system DLL",
-        kGeneratedCodeBase, kGeneratedCodeBase + kGeneratedCodeSize);
+        static_cast<uint64_t>(kGeneratedCodeBase),
+        kGeneratedCodeBase + kGeneratedCodeSize);
     return false;
   }
 
diff --git a/src/xenia/cpu/backend/x64/x64_emitter.cc b/src/xenia/cpu/backend/x64/x64_emitter.cc
index 2af7dadc2..e772276e7 100644
--- a/src/xenia/cpu/backend/x64/x64_emitter.cc
+++ b/src/xenia/cpu/backend/x64/x64_emitter.cc
@@ -245,7 +245,7 @@ bool X64Emitter::Emit(HIRBuilder* builder, EmitFunctionInfo& func_info) {
         // NOTE: If you encounter this after adding a new instruction, do a full
         // rebuild!
         assert_always();
-        XELOGE("Unable to process HIR opcode %s", instr->opcode->name);
+        XELOGE("Unable to process HIR opcode {}", instr->opcode->name);
         break;
       }
       instr = new_tail;
@@ -328,10 +328,10 @@ uint64_t TrapDebugPrint(void* raw_context, uint64_t address) {
   // uint16_t str_len = uint16_t(thread_state->context()->r[4]);
   auto str = thread_state->memory()->TranslateVirtual<const char*>(str_ptr);
   // TODO(benvanik): truncate to length?
-  XELOGD("(DebugPrint) %s", str);
+  XELOGD("(DebugPrint) {}", str);
 
   if (cvars::debugprint_trap_log) {
-    debugging::DebugPrint("(DebugPrint) %s", str);
+    debugging::DebugPrint("(DebugPrint) {}", str);
   }
 
   return 0;
@@ -363,7 +363,7 @@ void X64Emitter::Trap(uint16_t trap_type) {
       // ?
       break;
     default:
-      XELOGW("Unknown trap type %d", trap_type);
+      XELOGW("Unknown trap type {}", trap_type);
       db(0xCC);
       break;
   }
@@ -481,8 +481,8 @@ uint64_t UndefinedCallExtern(void* raw_context, uint64_t function_ptr) {
     xe::FatalError(fmt::format("undefined extern call to {:08X} {}",
                                function->address(), function->name().c_str()));
   } else {
-    XELOGE("undefined extern call to %.8X %s", function->address(),
-           function->name().c_str());
+    XELOGE("undefined extern call to {:08X} {}", function->address(),
+           function->name());
   }
   return 0;
 }
diff --git a/src/xenia/cpu/backend/x64/x64_sequences.cc b/src/xenia/cpu/backend/x64/x64_sequences.cc
index d6efaa245..f6a688b09 100644
--- a/src/xenia/cpu/backend/x64/x64_sequences.cc
+++ b/src/xenia/cpu/backend/x64/x64_sequences.cc
@@ -3163,7 +3163,7 @@ bool SelectSequence(X64Emitter* e, const Instr* i, const Instr** new_tail) {
       return true;
     }
   }
-  XELOGE("No sequence match for variant %s", i->opcode->name);
+  XELOGE("No sequence match for variant {}", i->opcode->name);
   return false;
 }
 
diff --git a/src/xenia/cpu/backend/x64/x64_tracers.cc b/src/xenia/cpu/backend/x64/x64_tracers.cc
index 061728494..404f4ecac 100644
--- a/src/xenia/cpu/backend/x64/x64_tracers.cc
+++ b/src/xenia/cpu/backend/x64/x64_tracers.cc
@@ -32,12 +32,13 @@ bool trace_enabled = true;
 #define THREAD_MATCH \
   (!TARGET_THREAD || thread_state->thread_id() == TARGET_THREAD)
 #define IFLUSH()
-#define IPRINT(s) \
-  if (trace_enabled && THREAD_MATCH) xe::LogLine(xe::LogLevel::Debug, 't', s)
+#define IPRINT(s)                    \
+  if (trace_enabled && THREAD_MATCH) \
+  xe::logging::AppendLogLine(xe::LogLevel::Debug, 't', s)
 #define DFLUSH()
 #define DPRINT(...)                  \
   if (trace_enabled && THREAD_MATCH) \
-  xe::LogLineFormat(xe::LogLevel::Debug, 't', __VA_ARGS__)
+  xe::logging::AppendLogLineFormat(xe::LogLevel::Debug, 't', __VA_ARGS__)
 
 uint32_t GetTracingMode() {
   uint32_t mode = 0;
@@ -58,36 +59,35 @@ void TraceString(void* raw_context, const char* str) {
 
 void TraceContextLoadI8(void* raw_context, uint64_t offset, uint8_t value) {
   auto thread_state = *reinterpret_cast<ThreadState**>(raw_context);
-  DPRINT("%d (%X) = ctx i8 +%" PRIu64 "\n", (int8_t)value, value, offset);
+  DPRINT("{} ({:X}) = ctx i8 +{}\n", (int8_t)value, value, offset);
 }
 void TraceContextLoadI16(void* raw_context, uint64_t offset, uint16_t value) {
   auto thread_state = *reinterpret_cast<ThreadState**>(raw_context);
-  DPRINT("%d (%X) = ctx i16 +%" PRIu64 "\n", (int16_t)value, value, offset);
+  DPRINT("{} ({:X}) = ctx i16 +{}\n", (int16_t)value, value, offset);
 }
 void TraceContextLoadI32(void* raw_context, uint64_t offset, uint32_t value) {
   auto thread_state = *reinterpret_cast<ThreadState**>(raw_context);
-  DPRINT("%d (%X) = ctx i32 +%" PRIu64 "\n", (int32_t)value, value, offset);
+  DPRINT("{} ({:X}) = ctx i32 +{}\n", (int32_t)value, value, offset);
 }
 void TraceContextLoadI64(void* raw_context, uint64_t offset, uint64_t value) {
   auto thread_state = *reinterpret_cast<ThreadState**>(raw_context);
-  DPRINT("%" PRId64 " (%" PRIX64 ") = ctx i64 +%" PRIu64 "\n", (int64_t)value,
-         value, offset);
+  DPRINT("{} ({:X}) = ctx i64 +{}\n", (int64_t)value, value, offset);
 }
 void TraceContextLoadF32(void* raw_context, uint64_t offset, __m128 value) {
   auto thread_state = *reinterpret_cast<ThreadState**>(raw_context);
-  DPRINT("%e (%X) = ctx f32 +%" PRIu64 "\n", xe::m128_f32<0>(value),
+  DPRINT("{} ({:X}) = ctx f32 +{}\n", xe::m128_f32<0>(value),
          xe::m128_i32<0>(value), offset);
 }
 void TraceContextLoadF64(void* raw_context, uint64_t offset,
                          const double* value) {
   auto thread_state = *reinterpret_cast<ThreadState**>(raw_context);
   auto v = _mm_loadu_pd(value);
-  DPRINT("%le (%" PRIX64 ") = ctx f64 +%" PRIu64 "\n", xe::m128_f64<0>(v),
-         xe::m128_i64<0>(v), offset);
+  DPRINT("{} ({:X}) = ctx f64 +{}\n", xe::m128_f64<0>(v), xe::m128_i64<0>(v),
+         offset);
 }
 void TraceContextLoadV128(void* raw_context, uint64_t offset, __m128 value) {
   auto thread_state = *reinterpret_cast<ThreadState**>(raw_context);
-  DPRINT("[%e, %e, %e, %e] [%.8X, %.8X, %.8X, %.8X] = ctx v128 +%" PRIu64 "\n",
+  DPRINT("[{}, {}, {}, {}] [{:08X}, {:08X}, {:08X}, {:08X}] = ctx v128 +{}\n",
          xe::m128_f32<0>(value), xe::m128_f32<1>(value), xe::m128_f32<2>(value),
          xe::m128_f32<3>(value), xe::m128_i32<0>(value), xe::m128_i32<1>(value),
          xe::m128_i32<2>(value), xe::m128_i32<3>(value), offset);
@@ -95,36 +95,35 @@ void TraceContextLoadV128(void* raw_context, uint64_t offset, __m128 value) {
 
 void TraceContextStoreI8(void* raw_context, uint64_t offset, uint8_t value) {
   auto thread_state = *reinterpret_cast<ThreadState**>(raw_context);
-  DPRINT("ctx i8 +%" PRIu64 " = %d (%X)\n", offset, (int8_t)value, value);
+  DPRINT("ctx i8 +{} = {} ({:X})\n", offset, (int8_t)value, value);
 }
 void TraceContextStoreI16(void* raw_context, uint64_t offset, uint16_t value) {
   auto thread_state = *reinterpret_cast<ThreadState**>(raw_context);
-  DPRINT("ctx i16 +%" PRIu64 " = %d (%X)\n", offset, (int16_t)value, value);
+  DPRINT("ctx i16 +{} = {} ({:X})\n", offset, (int16_t)value, value);
 }
 void TraceContextStoreI32(void* raw_context, uint64_t offset, uint32_t value) {
   auto thread_state = *reinterpret_cast<ThreadState**>(raw_context);
-  DPRINT("ctx i32 +%" PRIu64 " = %d (%X)\n", offset, (int32_t)value, value);
+  DPRINT("ctx i32 +{} = {} ({:X})\n", offset, (int32_t)value, value);
 }
 void TraceContextStoreI64(void* raw_context, uint64_t offset, uint64_t value) {
   auto thread_state = *reinterpret_cast<ThreadState**>(raw_context);
-  DPRINT("ctx i64 +%" PRIu64 " = %" PRId64 " (%" PRIX64 ")\n", offset,
-         (int64_t)value, value);
+  DPRINT("ctx i64 +{} = {} ({:X})\n", offset, (int64_t)value, value);
 }
 void TraceContextStoreF32(void* raw_context, uint64_t offset, __m128 value) {
   auto thread_state = *reinterpret_cast<ThreadState**>(raw_context);
-  DPRINT("ctx f32 +%" PRIu64 " = %e (%X)\n", offset, xe::m128_f32<0>(value),
+  DPRINT("ctx f32 +{} = {} ({:X})\n", offset, xe::m128_f32<0>(value),
          xe::m128_i32<0>(value));
 }
 void TraceContextStoreF64(void* raw_context, uint64_t offset,
                           const double* value) {
   auto thread_state = *reinterpret_cast<ThreadState**>(raw_context);
   auto v = _mm_loadu_pd(value);
-  DPRINT("ctx f64 +%" PRIu64 " = %le (%" PRIX64 ")\n", offset,
-         xe::m128_f64<0>(v), xe::m128_i64<0>(v));
+  DPRINT("ctx f64 +{} = {} ({:X})\n", offset, xe::m128_f64<0>(v),
+         xe::m128_i64<0>(v));
 }
 void TraceContextStoreV128(void* raw_context, uint64_t offset, __m128 value) {
   auto thread_state = *reinterpret_cast<ThreadState**>(raw_context);
-  DPRINT("ctx v128 +%" PRIu64 " = [%e, %e, %e, %e] [%.8X, %.8X, %.8X, %.8X]\n",
+  DPRINT("ctx v128 +{} = [{}, {}, {}, {}] [{:08X}, {:08X}, {:08X}, {:08X}]\n",
          offset, xe::m128_f32<0>(value), xe::m128_f32<1>(value),
          xe::m128_f32<2>(value), xe::m128_f32<3>(value), xe::m128_i32<0>(value),
          xe::m128_i32<1>(value), xe::m128_i32<2>(value),
@@ -133,80 +132,79 @@ void TraceContextStoreV128(void* raw_context, uint64_t offset, __m128 value) {
 
 void TraceMemoryLoadI8(void* raw_context, uint32_t address, uint8_t value) {
   auto thread_state = *reinterpret_cast<ThreadState**>(raw_context);
-  DPRINT("%d (%X) = load.i8 %.8X\n", (int8_t)value, value, address);
+  DPRINT("{} ({:X}) = load.i8 {:08X}\n", (int8_t)value, value, address);
 }
 void TraceMemoryLoadI16(void* raw_context, uint32_t address, uint16_t value) {
   auto thread_state = *reinterpret_cast<ThreadState**>(raw_context);
-  DPRINT("%d (%X) = load.i16 %.8X\n", (int16_t)value, value, address);
+  DPRINT("{} ({:X}) = load.i16 {:08X}\n", (int16_t)value, value, address);
 }
 void TraceMemoryLoadI32(void* raw_context, uint32_t address, uint32_t value) {
   auto thread_state = *reinterpret_cast<ThreadState**>(raw_context);
-  DPRINT("%d (%X) = load.i32 %.8X\n", (int32_t)value, value, address);
+  DPRINT("{} ({:X}) = load.i32 {:08X}\n", (int32_t)value, value, address);
 }
 void TraceMemoryLoadI64(void* raw_context, uint32_t address, uint64_t value) {
   auto thread_state = *reinterpret_cast<ThreadState**>(raw_context);
-  DPRINT("%" PRId64 " (%" PRIX64 ") = load.i64 %.8X\n", (int64_t)value, value,
-         address);
+  DPRINT("{} ({:X}) = load.i64 {:08X}\n", (int64_t)value, value, address);
 }
 void TraceMemoryLoadF32(void* raw_context, uint32_t address, __m128 value) {
   auto thread_state = *reinterpret_cast<ThreadState**>(raw_context);
-  DPRINT("%e (%X) = load.f32 %.8X\n", xe::m128_f32<0>(value),
+  DPRINT("{} ({:X}) = load.f32 {:08X}\n", xe::m128_f32<0>(value),
          xe::m128_i32<0>(value), address);
 }
 void TraceMemoryLoadF64(void* raw_context, uint32_t address, __m128 value) {
   auto thread_state = *reinterpret_cast<ThreadState**>(raw_context);
-  DPRINT("%le (%" PRIX64 ") = load.f64 %.8X\n", xe::m128_f64<0>(value),
+  DPRINT("{} ({:X}) = load.f64 {:08X}\n", xe::m128_f64<0>(value),
          xe::m128_i64<0>(value), address);
 }
 void TraceMemoryLoadV128(void* raw_context, uint32_t address, __m128 value) {
   auto thread_state = *reinterpret_cast<ThreadState**>(raw_context);
-  DPRINT("[%e, %e, %e, %e] [%.8X, %.8X, %.8X, %.8X] = load.v128 %.8X\n",
-         xe::m128_f32<0>(value), xe::m128_f32<1>(value), xe::m128_f32<2>(value),
-         xe::m128_f32<3>(value), xe::m128_i32<0>(value), xe::m128_i32<1>(value),
-         xe::m128_i32<2>(value), xe::m128_i32<3>(value), address);
+  DPRINT(
+      "[{}, {}, {}, {}] [{:08X}, {:08X}, {:08X}, {:08X}] = load.v128 {:08X}\n",
+      xe::m128_f32<0>(value), xe::m128_f32<1>(value), xe::m128_f32<2>(value),
+      xe::m128_f32<3>(value), xe::m128_i32<0>(value), xe::m128_i32<1>(value),
+      xe::m128_i32<2>(value), xe::m128_i32<3>(value), address);
 }
 
 void TraceMemoryStoreI8(void* raw_context, uint32_t address, uint8_t value) {
   auto thread_state = *reinterpret_cast<ThreadState**>(raw_context);
-  DPRINT("store.i8 %.8X = %d (%X)\n", address, (int8_t)value, value);
+  DPRINT("store.i8 {:08X} = {} ({:X})\n", address, (int8_t)value, value);
 }
 void TraceMemoryStoreI16(void* raw_context, uint32_t address, uint16_t value) {
   auto thread_state = *reinterpret_cast<ThreadState**>(raw_context);
-  DPRINT("store.i16 %.8X = %d (%X)\n", address, (int16_t)value, value);
+  DPRINT("store.i16 {:08X} = {} ({:X})\n", address, (int16_t)value, value);
 }
 void TraceMemoryStoreI32(void* raw_context, uint32_t address, uint32_t value) {
   auto thread_state = *reinterpret_cast<ThreadState**>(raw_context);
-  DPRINT("store.i32 %.8X = %d (%X)\n", address, (int32_t)value, value);
+  DPRINT("store.i32 {:08X} = {} ({:X})\n", address, (int32_t)value, value);
 }
 void TraceMemoryStoreI64(void* raw_context, uint32_t address, uint64_t value) {
   auto thread_state = *reinterpret_cast<ThreadState**>(raw_context);
-  DPRINT("store.i64 %.8X = %" PRId64 " (%" PRIX64 ")\n", address,
-         (int64_t)value, value);
+  DPRINT("store.i64 {:08X} = {} ({:X})\n", address, (int64_t)value, value);
 }
 void TraceMemoryStoreF32(void* raw_context, uint32_t address, __m128 value) {
   auto thread_state = *reinterpret_cast<ThreadState**>(raw_context);
-  DPRINT("store.f32 %.8X = %e (%X)\n", address, xe::m128_f32<0>(value),
+  DPRINT("store.f32 {:08X} = {} ({:X})\n", address, xe::m128_f32<0>(value),
          xe::m128_i32<0>(value));
 }
 void TraceMemoryStoreF64(void* raw_context, uint32_t address, __m128 value) {
   auto thread_state = *reinterpret_cast<ThreadState**>(raw_context);
-  DPRINT("store.f64 %.8X = %le (%" PRIX64 ")\n", address,
-         xe::m128_f64<0>(value), xe::m128_i64<0>(value));
+  DPRINT("store.f64 {:08X} = {} ({:X})\n", address, xe::m128_f64<0>(value),
+         xe::m128_i64<0>(value));
 }
 void TraceMemoryStoreV128(void* raw_context, uint32_t address, __m128 value) {
   auto thread_state = *reinterpret_cast<ThreadState**>(raw_context);
-  DPRINT("store.v128 %.8X = [%e, %e, %e, %e] [%.8X, %.8X, %.8X, %.8X]\n",
-         address, xe::m128_f32<0>(value), xe::m128_f32<1>(value),
-         xe::m128_f32<2>(value), xe::m128_f32<3>(value), xe::m128_i32<0>(value),
-         xe::m128_i32<1>(value), xe::m128_i32<2>(value),
-         xe::m128_i32<3>(value));
+  DPRINT(
+      "store.v128 {:08X} = [{}, {}, {}, {}] [{:08X}, {:08X}, {:08X}, {:08X}]\n",
+      address, xe::m128_f32<0>(value), xe::m128_f32<1>(value),
+      xe::m128_f32<2>(value), xe::m128_f32<3>(value), xe::m128_i32<0>(value),
+      xe::m128_i32<1>(value), xe::m128_i32<2>(value), xe::m128_i32<3>(value));
 }
 
 void TraceMemset(void* raw_context, uint32_t address, uint8_t value,
                  uint32_t length) {
   auto thread_state = *reinterpret_cast<ThreadState**>(raw_context);
-  DPRINT("memset %.8X-%.8X (%d) = %.2X", address, address + length, length,
-         value);
+  DPRINT("memset {:08X}-{:08X} ({}) = {:02X}", address, address + length,
+         length, value);
 }
 
 }  // namespace x64
diff --git a/src/xenia/cpu/elf_module.cc b/src/xenia/cpu/elf_module.cc
index e5c3c565c..a92d7f01a 100644
--- a/src/xenia/cpu/elf_module.cc
+++ b/src/xenia/cpu/elf_module.cc
@@ -83,7 +83,7 @@ bool ElfModule::Load(const std::string_view name, const std::string_view path,
     // Not a PPC ELF!
     XELOGE(
         "ELF: Could not load ELF because target machine is not PPC! (target: "
-        "%d)",
+        "{})",
         uint32_t(hdr->e_machine));
     return false;
   }
@@ -114,7 +114,7 @@ bool ElfModule::Load(const std::string_view name, const std::string_view path,
       // Allocate and copy into memory.
       // Base address @ 0x80000000
       if (phdr[i].p_vaddr < 0x80000000 || phdr[i].p_vaddr > 0x9FFFFFFF) {
-        XELOGE("ELF: Could not allocate memory for section @ address 0x%.8X",
+        XELOGE("ELF: Could not allocate memory for section @ address {:#08X}",
                uint32_t(phdr[i].p_vaddr));
         return false;
       }
diff --git a/src/xenia/cpu/function_debug_info.cc b/src/xenia/cpu/function_debug_info.cc
index 1cb7b484e..94eb38561 100644
--- a/src/xenia/cpu/function_debug_info.cc
+++ b/src/xenia/cpu/function_debug_info.cc
@@ -32,16 +32,16 @@ FunctionDebugInfo::~FunctionDebugInfo() {
 
 void FunctionDebugInfo::Dump() {
   if (source_disasm_) {
-    XELOGD("PPC:\n%s\n", source_disasm_);
+    XELOGD("PPC:\n{}\n", source_disasm_);
   }
   if (raw_hir_disasm_) {
-    XELOGD("Unoptimized HIR:\n%s\n", raw_hir_disasm_);
+    XELOGD("Unoptimized HIR:\n{}\n", raw_hir_disasm_);
   }
   if (hir_disasm_) {
-    XELOGD("Optimized HIR:\n%s\n", hir_disasm_);
+    XELOGD("Optimized HIR:\n{}\n", hir_disasm_);
   }
   if (machine_code_disasm_) {
-    XELOGD("Machine Code:\n%s\n", machine_code_disasm_);
+    XELOGD("Machine Code:\n{}\n", machine_code_disasm_);
   }
 }
 
diff --git a/src/xenia/cpu/mmio_handler.cc b/src/xenia/cpu/mmio_handler.cc
index 4891ab1bc..3bcefb6e3 100644
--- a/src/xenia/cpu/mmio_handler.cc
+++ b/src/xenia/cpu/mmio_handler.cc
@@ -339,7 +339,7 @@ bool MMIOHandler::ExceptionCallback(Exception* ex) {
   DecodedMov mov = {0};
   bool decoded = TryDecodeMov(p, &mov);
   if (!decoded) {
-    XELOGE("Unable to decode MMIO mov at %p", p);
+    XELOGE("Unable to decode MMIO mov at {}", p);
     assert_always("Unknown MMIO instruction type");
     return false;
   }
diff --git a/src/xenia/cpu/ppc/ppc_emit-private.h b/src/xenia/cpu/ppc/ppc_emit-private.h
index 3e4449455..9e0cbe233 100644
--- a/src/xenia/cpu/ppc/ppc_emit-private.h
+++ b/src/xenia/cpu/ppc/ppc_emit-private.h
@@ -22,8 +22,8 @@ namespace ppc {
 #define XEREGISTERINSTR(name) \
   RegisterOpcodeEmitter(PPCOpcode::name, InstrEmit_##name);
 
-#define XEINSTRNOTIMPLEMENTED()                          \
-  XELOGE("Unimplemented instruction: %s", __FUNCTION__); \
+#define XEINSTRNOTIMPLEMENTED()                      \
+  XELOGE("Unimplemented instruction: {}", __func__); \
   assert_always("Instruction not implemented");
 
 }  // namespace ppc
diff --git a/src/xenia/cpu/ppc/ppc_hir_builder.cc b/src/xenia/cpu/ppc/ppc_hir_builder.cc
index a7e189f27..63bc80f59 100644
--- a/src/xenia/cpu/ppc/ppc_hir_builder.cc
+++ b/src/xenia/cpu/ppc/ppc_hir_builder.cc
@@ -146,7 +146,7 @@ bool PPCHIRBuilder::Emit(GuestFunction* function, uint32_t flags) {
     instr_offset_list_[offset] = first_instr;
 
     if (opcode == PPCOpcode::kInvalid) {
-      XELOGE("Invalid instruction %.8llX %.8X", address, code);
+      XELOGE("Invalid instruction {:08X} {:08X}", address, code);
       Comment("INVALID!");
       // TraceInvalidInstruction(i);
       continue;
@@ -169,7 +169,7 @@ bool PPCHIRBuilder::Emit(GuestFunction* function, uint32_t flags) {
     i.opcode_info = &opcode_info;
     if (!opcode_info.emit || opcode_info.emit(*this, i)) {
       auto& disasm_info = GetOpcodeDisasmInfo(opcode);
-      XELOGE("Unimplemented instr %.8llX %.8X %s", address, code,
+      XELOGE("Unimplemented instr {:08X} {:08X} {}", address, code,
              disasm_info.name);
       Comment("UNIMPLEMENTED!");
       DebugBreak();
diff --git a/src/xenia/cpu/ppc/ppc_scanner.cc b/src/xenia/cpu/ppc/ppc_scanner.cc
index 45c640926..004ac9389 100644
--- a/src/xenia/cpu/ppc/ppc_scanner.cc
+++ b/src/xenia/cpu/ppc/ppc_scanner.cc
@@ -51,7 +51,7 @@ bool PPCScanner::Scan(GuestFunction* function, FunctionDebugInfo* debug_info) {
 
   Memory* memory = frontend_->memory();
 
-  LOGPPC("Analyzing function %.8X...", function->address());
+  LOGPPC("Analyzing function {:08X}...", function->address());
 
   // For debug info, only if needed.
   uint32_t address_reference_count = 0;
@@ -71,7 +71,7 @@ bool PPCScanner::Scan(GuestFunction* function, FunctionDebugInfo* debug_info) {
     // If we fetched 0 assume that we somehow hit one of the awesome
     // 'no really we meant to end after that bl' functions.
     if (!code) {
-      LOGPPC("function end %.8X (0x00000000 read)", address);
+      LOGPPC("function end {:08X} (0x00000000 read)", address);
       // Don't include the 0's.
       address -= 4;
       break;
@@ -106,16 +106,17 @@ bool PPCScanner::Scan(GuestFunction* function, FunctionDebugInfo* debug_info) {
       // Invalid instruction.
       // We can just ignore it because there's (very little)/no chance it'll
       // affect flow control.
-      LOGPPC("Invalid instruction at %.8X: %.8X", address, code);
+      LOGPPC("Invalid instruction at {:08X}: {:08X}", address, code);
     } else if (code == 0x4E800020) {
       // blr -- unconditional branch to LR.
       // This is generally a return.
       if (furthest_target > address) {
         // Remaining targets within function, not end.
-        LOGPPC("ignoring blr %.8X (branch to %.8X)", address, furthest_target);
+        LOGPPC("ignoring blr {:08X} (branch to {:08X})", address,
+               furthest_target);
       } else {
         // Function end point.
-        LOGPPC("function end %.8X", address);
+        LOGPPC("function end {:08X}", address);
         ends_fn = true;
       }
       ends_block = true;
@@ -126,10 +127,11 @@ bool PPCScanner::Scan(GuestFunction* function, FunctionDebugInfo* debug_info) {
       // TODO(benvanik): decode jump tables.
       if (furthest_target > address) {
         // Remaining targets within function, not end.
-        LOGPPC("ignoring bctr %.8X (branch to %.8X)", address, furthest_target);
+        LOGPPC("ignoring bctr {:08X} (branch to {:08X})", address,
+               furthest_target);
       } else {
         // Function end point.
-        LOGPPC("function end %.8X", address);
+        LOGPPC("function end {:08X}", address);
         ends_fn = true;
       }
       ends_block = true;
@@ -137,25 +139,25 @@ bool PPCScanner::Scan(GuestFunction* function, FunctionDebugInfo* debug_info) {
       // b/ba/bl/bla
       uint32_t target = d.I.ADDR();
       if (d.I.LK()) {
-        LOGPPC("bl %.8X -> %.8X", address, target);
+        LOGPPC("bl {:08X} -> {:08X}", address, target);
         // Queue call target if needed.
         // GetOrInsertFunction(target);
       } else {
-        LOGPPC("b %.8X -> %.8X", address, target);
+        LOGPPC("b {:08X} -> {:08X}", address, target);
 
         // If the target is back into the function and there's no further target
         // we are at the end of a function.
         // (Indirect branches may still go beyond, but no way of knowing).
         if (target >= start_address && target < address &&
             furthest_target <= address) {
-          LOGPPC("function end %.8X (back b)", address);
+          LOGPPC("function end {:08X} (back b)", address);
           ends_fn = true;
         }
 
         // If the target is not a branch and it goes to before the current
         // address it's definitely a tail call.
         if (!ends_fn && target < start_address && furthest_target <= address) {
-          LOGPPC("function end %.8X (back b before addr)", address);
+          LOGPPC("function end {:08X} (back b before addr)", address);
           ends_fn = true;
         }
 
@@ -164,7 +166,7 @@ bool PPCScanner::Scan(GuestFunction* function, FunctionDebugInfo* debug_info) {
         // of the function somewhere, so ensure we don't have any branches over
         // it.
         if (!ends_fn && furthest_target <= address && IsRestGprLr(target)) {
-          LOGPPC("function end %.8X (__restgprlr_*)", address);
+          LOGPPC("function end {:08X} (__restgprlr_*)", address);
           ends_fn = true;
         }
 
@@ -176,7 +178,7 @@ bool PPCScanner::Scan(GuestFunction* function, FunctionDebugInfo* debug_info) {
         // This check may hit on functions that jump over data code, so only
         // trigger this check in leaf functions (no mfspr lr/prolog).
         if (!ends_fn && !starts_with_mfspr_lr && blocks_found == 1) {
-          LOGPPC("HEURISTIC: ending at simple leaf thunk %.8X", address);
+          LOGPPC("HEURISTIC: ending at simple leaf thunk {:08X}", address);
           ends_fn = true;
         }
 
@@ -213,14 +215,14 @@ bool PPCScanner::Scan(GuestFunction* function, FunctionDebugInfo* debug_info) {
       // bc/bca/bcl/bcla
       uint32_t target = d.B.ADDR();
       if (d.B.LK()) {
-        LOGPPC("bcl %.8X -> %.8X", address, target);
+        LOGPPC("bcl {:08X} -> {:08X}", address, target);
 
         // Queue call target if needed.
         // TODO(benvanik): see if this is correct - not sure anyone makes
         //     function calls with bcl.
         // GetOrInsertFunction(target);
       } else {
-        LOGPPC("bc %.8X -> %.8X", address, target);
+        LOGPPC("bc {:08X} -> {:08X}", address, target);
 
         // TODO(benvanik): GetOrInsertFunction? it's likely a BB
 
@@ -232,17 +234,17 @@ bool PPCScanner::Scan(GuestFunction* function, FunctionDebugInfo* debug_info) {
     } else if (opcode == PPCOpcode::bclrx) {
       // bclr/bclrl
       if (d.XL.LK()) {
-        LOGPPC("bclrl %.8X", address);
+        LOGPPC("bclrl {:08X}", address);
       } else {
-        LOGPPC("bclr %.8X", address);
+        LOGPPC("bclr {:08X}", address);
       }
       ends_block = true;
     } else if (opcode == PPCOpcode::bcctrx) {
       // bcctr/bcctrl
       if (d.XL.LK()) {
-        LOGPPC("bcctrl %.8X", address);
+        LOGPPC("bcctrl {:08X}", address);
       } else {
-        LOGPPC("bcctr %.8X", address);
+        LOGPPC("bcctr {:08X}", address);
       }
       ends_block = true;
     }
@@ -257,7 +259,8 @@ bool PPCScanner::Scan(GuestFunction* function, FunctionDebugInfo* debug_info) {
     address += 4;
     if (end_address && address > end_address) {
       // Hmm....
-      LOGPPC("Ran over function bounds! %.8X-%.8X", start_address, end_address);
+      LOGPPC("Ran over function bounds! {:08X}-{:08X}", start_address,
+             end_address);
       break;
     }
   }
@@ -267,7 +270,7 @@ bool PPCScanner::Scan(GuestFunction* function, FunctionDebugInfo* debug_info) {
     // from someplace valid (like method hints) this may indicate an error.
     // It's also possible that we guessed in hole-filling and there's another
     // function below this one.
-    LOGPPC("Function ran under: %.8X-%.8X ended at %.8X", start_address,
+    LOGPPC("Function ran under: {:08X}-{:08X} ended at {:08X}", start_address,
            end_address, address + 4);
   }
   function->set_end_address(address);
@@ -285,7 +288,7 @@ bool PPCScanner::Scan(GuestFunction* function, FunctionDebugInfo* debug_info) {
     debug_info->set_instruction_result_count(instruction_result_count);
   }
 
-  LOGPPC("Finished analyzing %.8X", start_address);
+  LOGPPC("Finished analyzing {:08X}", start_address);
   return true;
 }
 
diff --git a/src/xenia/cpu/ppc/testing/ppc_testing_main.cc b/src/xenia/cpu/ppc/testing/ppc_testing_main.cc
index 992c497fe..112da086e 100644
--- a/src/xenia/cpu/ppc/testing/ppc_testing_main.cc
+++ b/src/xenia/cpu/ppc/testing/ppc_testing_main.cc
@@ -61,13 +61,13 @@ class TestSuite {
 
   bool Load() {
     if (!ReadMap()) {
-      XELOGE("Unable to read map for test %s",
-             xe::path_to_utf8(src_file_path_).c_str());
+      XELOGE("Unable to read map for test {}",
+             xe::path_to_utf8(src_file_path_));
       return false;
     }
     if (!ReadAnnotations()) {
-      XELOGE("Unable to read annotations for test %s",
-             xe::path_to_utf8(src_file_path_).c_str());
+      XELOGE("Unable to read annotations for test {}",
+             xe::path_to_utf8(src_file_path_));
       return false;
     }
     return true;
@@ -144,8 +144,8 @@ class TestSuite {
         std::string label(start + strlen("test_"), strchr(start, ':'));
         current_test_case = FindTestCase(label);
         if (!current_test_case) {
-          XELOGE("Test case %s not found in corresponding map for %s",
-                 label.c_str(), xe::path_to_utf8(src_file_path_).c_str());
+          XELOGE("Test case {} not found in corresponding map for {}", label,
+                 xe::path_to_utf8(src_file_path_));
           return false;
         }
       } else if (strlen(start) > 3 && start[0] == '#' && start[1] == '_') {
@@ -160,8 +160,8 @@ class TestSuite {
             value.erase(value.end() - 1);
           }
           if (!current_test_case) {
-            XELOGE("Annotation outside of test case in %s",
-                   xe::path_to_utf8(src_file_path_).c_str());
+            XELOGE("Annotation outside of test case in {}",
+                   xe::path_to_utf8(src_file_path_));
             return false;
           }
           current_test_case->annotations.emplace_back(key, value);
@@ -214,8 +214,8 @@ class TestRunner {
     // Load the binary module.
     auto module = std::make_unique<xe::cpu::RawModule>(processor_.get());
     if (!module->LoadFile(START_ADDRESS, suite.bin_file_path())) {
-      XELOGE("Unable to load test binary %s",
-             xe::path_to_utf8(suite.bin_file_path).c_str());
+      XELOGE("Unable to load test binary {}",
+             xe::path_to_utf8(suite.bin_file_path()));
       return false;
     }
     processor_->AddModule(std::move(module));
@@ -313,9 +313,9 @@ class TestRunner {
         if (!ppc_context->CompareRegWithString(
                 reg_name.c_str(), reg_value.c_str(), actual_value)) {
           any_failed = true;
-          XELOGE("Register %s assert failed:\n", reg_name.c_str());
-          XELOGE("  Expected: %s == %s\n", reg_name.c_str(), reg_value.c_str());
-          XELOGE("    Actual: %s == %s\n", reg_name.c_str(), actual_value);
+          XELOGE("Register {} assert failed:\n", reg_name);
+          XELOGE("  Expected: {} == {}\n", reg_name, reg_value);
+          XELOGE("    Actual: {} == {}\n", reg_name, actual_value);
         }
       } else if (it.first == "MEMORY_OUT") {
         size_t space_pos = it.second.find(" ");
@@ -338,9 +338,9 @@ class TestRunner {
           uint8_t actual = *p;
           if (expected != actual) {
             any_failed = true;
-            XELOGE("Memory %s assert failed:\n", address_str.c_str());
-            XELOGE("  Expected: %.8X %.2X\n", current_address, expected);
-            XELOGE("    Actual: %.8X %.2X\n", current_address, actual);
+            XELOGE("Memory {} assert failed:\n", address_str);
+            XELOGE("  Expected: {:08X} {:02X}\n", current_address, expected);
+            XELOGE("    Actual: {:08X} {:02X}\n", current_address, actual);
           }
           ++p;
         }
@@ -418,7 +418,7 @@ bool RunTests(const std::string_view test_name) {
     XELOGE("No tests discovered - invalid path?");
     return false;
   }
-  XELOGI("%d tests discovered.", (int)test_files.size());
+  XELOGI("{} tests discovered.", test_files.size());
   XELOGI("");
 
   std::vector<TestSuite> test_suites;
@@ -429,8 +429,7 @@ bool RunTests(const std::string_view test_name) {
       continue;
     }
     if (!test_suite.Load()) {
-      XELOGE("TEST SUITE %s FAILED TO LOAD",
-             xe::path_to_utf8(test_path).c_str());
+      XELOGE("TEST SUITE {} FAILED TO LOAD", xe::path_to_utf8(test_path));
       load_failed = true;
       continue;
     }
@@ -440,13 +439,13 @@ bool RunTests(const std::string_view test_name) {
     XELOGE("One or more test suites failed to load.");
   }
 
-  XELOGI("%d tests loaded.", (int)test_suites.size());
+  XELOGI("{} tests loaded.", test_suites.size());
   TestRunner runner;
   for (auto& test_suite : test_suites) {
-    XELOGI("%s.s:", xe::path_to_utf8(test_suite.name()).c_str());
+    XELOGI("{}.s:", test_suite.name());
 
     for (auto& test_case : test_suite.test_cases()) {
-      XELOGI("  - %s", test_case.name.c_str());
+      XELOGI("  - {}", test_case.name);
       ProtectedRunTest(test_suite, runner, test_case, failed_count,
                        passed_count);
     }
@@ -455,9 +454,9 @@ bool RunTests(const std::string_view test_name) {
   }
 
   XELOGI("");
-  XELOGI("Total tests: %d", failed_count + passed_count);
-  XELOGI("Passed: %d", passed_count);
-  XELOGI("Failed: %d", failed_count);
+  XELOGI("Total tests: {}", failed_count + passed_count);
+  XELOGI("Passed: {}", passed_count);
+  XELOGI("Failed: {}", failed_count);
 
   return failed_count ? false : true;
 }
diff --git a/src/xenia/cpu/processor.cc b/src/xenia/cpu/processor.cc
index c36d77a32..7a787873d 100644
--- a/src/xenia/cpu/processor.cc
+++ b/src/xenia/cpu/processor.cc
@@ -323,7 +323,7 @@ bool Processor::Execute(ThreadState* thread_state, uint32_t address) {
   auto function = ResolveFunction(address);
   if (!function) {
     // Symbol not found in any module.
-    XELOGCPU("Execute(%.8X): failed to find function", address);
+    XELOGCPU("Execute({:08X}): failed to find function", address);
     return false;
   }
 
@@ -354,7 +354,7 @@ bool Processor::ExecuteRaw(ThreadState* thread_state, uint32_t address) {
   auto function = ResolveFunction(address);
   if (!function) {
     // Symbol not found in any module.
-    XELOGCPU("Execute(%.8X): failed to find function", address);
+    XELOGCPU("Execute({:08X}): failed to find function", address);
     return false;
   }
 
@@ -973,8 +973,9 @@ bool Processor::StepToGuestAddress(uint32_t thread_id, uint32_t pc) {
   if (functions.empty()) {
     // Function hasn't been generated yet. Generate it.
     if (!ResolveFunction(pc)) {
-      XELOGE("Processor::StepToAddress(%.8X) - Function could not be resolved",
-             pc);
+      XELOGE(
+          "Processor::StepToAddress({:08X}) - Function could not be resolved",
+          pc);
       return false;
     }
   }
diff --git a/src/xenia/cpu/xex_module.cc b/src/xenia/cpu/xex_module.cc
index ed2cce904..0bd727f0f 100644
--- a/src/xenia/cpu/xex_module.cc
+++ b/src/xenia/cpu/xex_module.cc
@@ -128,7 +128,7 @@ uint32_t XexModule::GetProcAddress(uint16_t ordinal) const {
 
     ordinal -= export_table->base;
     if (ordinal > export_table->count) {
-      XELOGE("GetProcAddress(%.3X): ordinal out of bounds", ordinal);
+      XELOGE("GetProcAddress({:03X}): ordinal out of bounds", ordinal);
       return 0;
     }
 
@@ -290,7 +290,7 @@ int XexModule::ApplyPatch(XexModule* module) {
       &patch_header->info, headerpatch_size,
       file_format_header->compression_info.normal.window_size, header_ptr);
   if (result_code) {
-    XELOGE("XEX header patch application failed, error code %d", result_code);
+    XELOGE("XEX header patch application failed, error code {}", result_code);
     return result_code;
   }
 
@@ -315,7 +315,7 @@ int XexModule::ApplyPatch(XexModule* module) {
                 xe::kMemoryProtectRead | xe::kMemoryProtectWrite);
 
     if (!alloc_result) {
-      XELOGE("Unable to allocate XEX memory at %.8X-%.8X.", addr_new_mem,
+      XELOGE("Unable to allocate XEX memory at {:08X}-{:08X}.", addr_new_mem,
              size_delta);
       assert_always();
       return 6;
@@ -440,7 +440,7 @@ int XexModule::ApplyPatch(XexModule* module) {
                              ->Decommit(addr_free_mem, size_delta);
 
       if (!free_result) {
-        XELOGE("Unable to decommit XEX memory at %.8X-%.8X.", addr_free_mem,
+        XELOGE("Unable to decommit XEX memory at {:08X}-{:08X}.", addr_free_mem,
                size_delta);
         assert_always();
       }
@@ -455,12 +455,12 @@ int XexModule::ApplyPatch(XexModule* module) {
         xe::byte_swap<uint32_t>(patch_header->target_version.value);
 
     XELOGI(
-        "XEX patch applied successfully: base version: %d.%d.%d.%d, new "
-        "version: %d.%d.%d.%d",
+        "XEX patch applied successfully: base version: {}.{}.{}.{}, new "
+        "version: {}.{}.{}.{}",
         source_ver.major, source_ver.minor, source_ver.build, source_ver.qfe,
         target_ver.major, target_ver.minor, target_ver.build, target_ver.qfe);
   } else {
-    XELOGE("XEX patch application failed, error code %d", result_code);
+    XELOGE("XEX patch application failed, error code {}", result_code);
   }
 
   if (free_input) {
@@ -536,7 +536,7 @@ int XexModule::ReadImageUncompressed(const void* xex_addr, size_t xex_length) {
               xe::kMemoryAllocationReserve | xe::kMemoryAllocationCommit,
               xe::kMemoryProtectRead | xe::kMemoryProtectWrite);
   if (!alloc_result) {
-    XELOGE("Unable to allocate XEX memory at %.8X-%.8X.", base_address_,
+    XELOGE("Unable to allocate XEX memory at {:08X}-{:08X}.", base_address_,
            uncompressed_size);
     return 2;
   }
@@ -603,7 +603,7 @@ int XexModule::ReadImageBasicCompressed(const void* xex_addr,
       xe::kMemoryAllocationReserve | xe::kMemoryAllocationCommit,
       xe::kMemoryProtectRead | xe::kMemoryProtectWrite);
   if (!alloc_result) {
-    XELOGE("Unable to allocate XEX memory at %.8X-%.8X.", base_address_,
+    XELOGE("Unable to allocate XEX memory at {:08X}-{:08X}.", base_address_,
            uncompressed_size);
     return 1;
   }
@@ -761,7 +761,7 @@ int XexModule::ReadImageCompressed(const void* xex_addr, size_t xex_length) {
           compress_buffer, d - compress_buffer, buffer, uncompressed_size,
           compression_info->normal.window_size, nullptr, 0);
     } else {
-      XELOGE("Unable to allocate XEX memory at %.8X-%.8X.", base_address_,
+      XELOGE("Unable to allocate XEX memory at {:08X}-{:08X}.", base_address_,
              uncompressed_size);
       result_code = 3;
     }
@@ -933,12 +933,12 @@ bool XexModule::Load(const std::string_view name, const std::string_view path,
   // We'll try using both XEX2 keys to see if any give a valid PE
   int result_code = ReadImage(xex_addr, xex_length, false);
   if (result_code) {
-    XELOGW("XEX load failed with code %d, trying with devkit encryption key...",
+    XELOGW("XEX load failed with code {}, trying with devkit encryption key...",
            result_code);
 
     result_code = ReadImage(xex_addr, xex_length, true);
     if (result_code) {
-      XELOGE("XEX load failed with code %d, tried both encryption keys",
+      XELOGE("XEX load failed with code {}, tried both encryption keys",
              result_code);
       return false;
     }
@@ -1132,9 +1132,9 @@ bool XexModule::SetupLibraryImports(const std::string_view name,
     // Import not resolved?
     if (!kernel_export && !user_export_addr) {
       XELOGW(
-          "WARNING: an import variable was not resolved! (library: %s, import "
-          "lib: %s, ordinal: %.3X)",
-          name_.c_str(), name.c_str(), ordinal);
+          "WARNING: an import variable was not resolved! (library: {}, import "
+          "lib: {}, ordinal: {:03X})",
+          name_, name, ordinal);
     }
 
     StringBuffer import_name;
@@ -1166,7 +1166,7 @@ bool XexModule::SetupLibraryImports(const std::string_view name,
           } else {
             // Not implemented - write with a dummy value.
             *record_slot = 0xD000BEEF | (kernel_export->ordinal & 0xFFF) << 16;
-            XELOGCPU("WARNING: imported a variable with no value: %s",
+            XELOGCPU("WARNING: imported a variable with no value: {}",
                      kernel_export->name);
           }
         }
@@ -1251,8 +1251,8 @@ bool XexModule::SetupLibraryImports(const std::string_view name,
                 (GuestFunction::ExternHandler)kernel_export->function_data.shim;
           }
         } else {
-          XELOGW("WARNING: Imported kernel function %s is unimplemented!",
-                 import_name.buffer());
+          XELOGW("WARNING: Imported kernel function {} is unimplemented!",
+                 import_name.to_string_view());
         }
         static_cast<GuestFunction*>(function)->SetupExtern(handler,
                                                            kernel_export);
diff --git a/src/xenia/emulator.cc b/src/xenia/emulator.cc
index e7833826c..8169c205c 100644
--- a/src/xenia/emulator.cc
+++ b/src/xenia/emulator.cc
@@ -546,23 +546,24 @@ bool Emulator::ExceptionCallback(Exception* ex) {
   auto context = current_thread->thread_state()->context();
 
   XELOGE("==== CRASH DUMP ====");
-  XELOGE("Thread ID (Host: 0x%.8X / Guest: 0x%.8X)",
+  XELOGE("Thread ID (Host: {:#08X} / Guest: {:#08X})",
          current_thread->thread()->system_id(), current_thread->thread_id());
-  XELOGE("Thread Handle: 0x%.8X", current_thread->handle());
-  XELOGE("PC: 0x%.8X", guest_function->MapMachineCodeToGuestAddress(ex->pc()));
+  XELOGE("Thread Handle: {:#08X}", current_thread->handle());
+  XELOGE("PC: {:#08X}", guest_function->MapMachineCodeToGuestAddress(ex->pc()));
   XELOGE("Registers:");
   for (int i = 0; i < 32; i++) {
-    XELOGE(" r%-3d = 0x%.16" PRIX64, i, context->r[i]);
+    XELOGE(" r{:-3d} = {:016X}", i, context->r[i]);
   }
 
   for (int i = 0; i < 32; i++) {
-    XELOGE(" f%-3d = 0x%.16" PRIX64 " = (double)%f = (float)%f", i,
-           context->f[i], context->f[i], *(float*)&context->f[i]);
+    XELOGE(" f{:-3d} = {:08X} = (double){} = (float){}", i, context->f[i],
+           context->f[i], *(float*)&context->f[i]);
   }
 
   for (int i = 0; i < 128; i++) {
-    XELOGE(" v%-3d = [0x%.8X, 0x%.8X, 0x%.8X, 0x%.8X]", i, context->v[i].i32[0],
-           context->v[i].i32[1], context->v[i].i32[2], context->v[i].i32[3]);
+    XELOGE(" v{:-3d} = [{:#08X}, {:#08X}, {:#08X}, {:#08X}]", i,
+           context->v[i].i32[0], context->v[i].i32[1], context->v[i].i32[2],
+           context->v[i].i32[3]);
   }
 
   // Display a dialog telling the user the guest has crashed.
@@ -621,14 +622,14 @@ std::string Emulator::FindLaunchModule() {
       if (XSUCCEEDED(result)) {
         kernel::util::GameInfo info(buffer);
         if (info.is_valid()) {
-          XELOGI("Found virtual title %s", info.virtual_title_id().c_str());
+          XELOGI("Found virtual title {}", info.virtual_title_id());
 
           const std::string xna_id("584E07D1");
           auto xna_id_entry(file_system_->ResolvePath(path + xna_id));
           if (xna_id_entry) {
             default_module = xna_id + "\\" + info.module_name();
           } else {
-            XELOGE("Could not find fixed XNA path %s", xna_id.c_str());
+            XELOGE("Could not find fixed XNA path {}", xna_id);
           }
         }
       }
@@ -648,10 +649,10 @@ X_STATUS Emulator::CompleteLaunch(const std::filesystem::path& path,
   // Allow xam to request module loads.
   auto xam = kernel_state()->GetKernelModule<kernel::xam::XamModule>("xam.xex");
 
-  XELOGI("Launching module %s", module_path.c_str());
+  XELOGI("Launching module {}", module_path);
   auto module = kernel_state_->LoadUserModule(module_path);
   if (!module) {
-    XELOGE("Failed to load user module %s", xe::path_to_utf8(path).c_str());
+    XELOGE("Failed to load user module {}", xe::path_to_utf8(path));
     return X_STATUS_NOT_FOUND;
   }
 
diff --git a/src/xenia/gpu/command_processor.cc b/src/xenia/gpu/command_processor.cc
index 8f935f7e6..b0278a3d0 100644
--- a/src/xenia/gpu/command_processor.cc
+++ b/src/xenia/gpu/command_processor.cc
@@ -284,13 +284,13 @@ void CommandProcessor::UpdateWritePointer(uint32_t value) {
 void CommandProcessor::WriteRegister(uint32_t index, uint32_t value) {
   RegisterFile* regs = register_file_;
   if (index >= RegisterFile::kRegisterCount) {
-    XELOGW("CommandProcessor::WriteRegister index out of bounds: %d", index);
+    XELOGW("CommandProcessor::WriteRegister index out of bounds: {}", index);
     return;
   }
 
   regs->values[index].u32 = value;
   if (!regs->GetRegisterInfo(index)) {
-    XELOGW("GPU: Write to unknown register (%.4X = %.8X)", index, value);
+    XELOGW("GPU: Write to unknown register ({:04X} = {:08X})", index, value);
   }
 
   // If this is a COHER register, set the dirty flag.
@@ -376,7 +376,7 @@ void CommandProcessor::MakeCoherent() {
   }
 
   // TODO(benvanik): notify resource cache of base->size and type.
-  XELOGD("Make %.8X -> %.8X (%db) coherent, action = %s", base_host,
+  XELOGD("Make {:08X} -> {:08X} ({}b) coherent, action = {}", base_host,
          base_host + size_host, size_host, action);
 
   // Mark coherent.
@@ -541,8 +541,9 @@ bool CommandProcessor::ExecutePacketType0(RingBuffer* reader, uint32_t packet) {
 
   uint32_t count = ((packet >> 16) & 0x3FFF) + 1;
   if (reader->read_count() < count * sizeof(uint32_t)) {
-    XELOGE("ExecutePacketType0 overflow (read count %.8X, packet count %.8X)",
-           reader->read_count(), count * sizeof(uint32_t));
+    XELOGE(
+        "ExecutePacketType0 overflow (read count {:08X}, packet count {:08X})",
+        reader->read_count(), count * sizeof(uint32_t));
     return false;
   }
 
@@ -589,8 +590,9 @@ bool CommandProcessor::ExecutePacketType3(RingBuffer* reader, uint32_t packet) {
   auto data_start_offset = reader->read_offset();
 
   if (reader->read_count() < count * sizeof(uint32_t)) {
-    XELOGE("ExecutePacketType3 overflow (read count %.8X, packet count %.8X)",
-           reader->read_count(), count * sizeof(uint32_t));
+    XELOGE(
+        "ExecutePacketType3 overflow (read count {:08X}, packet count {:08X})",
+        reader->read_count(), count * sizeof(uint32_t));
     return false;
   }
 
@@ -728,14 +730,14 @@ bool CommandProcessor::ExecutePacketType3(RingBuffer* reader, uint32_t packet) {
     case PM4_CONTEXT_UPDATE: {
       assert_true(count == 1);
       uint64_t value = reader->ReadAndSwap<uint32_t>();
-      XELOGGPU("GPU context update = %.8X", value);
+      XELOGGPU("GPU context update = {:08X}", value);
       assert_true(value == 0);
       result = true;
       break;
     }
 
     default:
-      XELOGGPU("Unimplemented GPU OPCODE: 0x%.2X\t\tCOUNT: %d\n", opcode,
+      XELOGGPU("Unimplemented GPU OPCODE: {:#02X}\t\tCOUNT: {}\n", opcode,
                count);
       assert_always();
       reader->AdvanceRead(count * sizeof(uint32_t));
@@ -1200,7 +1202,7 @@ bool CommandProcessor::ExecutePacketType3_DRAW_INDX(RingBuffer* reader,
                 xenos::IsMajorModeExplicit(vgt_draw_initiator.major_mode,
                                            vgt_draw_initiator.prim_type));
   if (!success) {
-    XELOGE("PM4_DRAW_INDX(%d, %d, %d): Failed in backend",
+    XELOGE("PM4_DRAW_INDX({}, {}, {}): Failed in backend",
            vgt_draw_initiator.num_indices,
            uint32_t(vgt_draw_initiator.prim_type),
            uint32_t(vgt_draw_initiator.source_select));
@@ -1231,7 +1233,7 @@ bool CommandProcessor::ExecutePacketType3_DRAW_INDX_2(RingBuffer* reader,
       xenos::IsMajorModeExplicit(vgt_draw_initiator.major_mode,
                                  vgt_draw_initiator.prim_type));
   if (!success) {
-    XELOGE("PM4_DRAW_INDX_IMM(%d, %d): Failed in backend",
+    XELOGE("PM4_DRAW_INDX_IMM({}, {}): Failed in backend",
            vgt_draw_initiator.num_indices,
            uint32_t(vgt_draw_initiator.prim_type));
   }
@@ -1426,11 +1428,11 @@ bool CommandProcessor::ExecutePacketType3_VIZ_QUERY(RingBuffer* reader,
   if (!end) {
     // begin a new viz query @ id
     WriteRegister(XE_GPU_REG_VGT_EVENT_INITIATOR, VIZQUERY_START);
-    XELOGGPU("Begin viz query ID %.2X", id);
+    XELOGGPU("Begin viz query ID {:02X}", id);
   } else {
     // end the viz query
     WriteRegister(XE_GPU_REG_VGT_EVENT_INITIATOR, VIZQUERY_END);
-    XELOGGPU("End viz query ID %.2X", id);
+    XELOGGPU("End viz query ID {:02X}", id);
   }
 
   return true;
diff --git a/src/xenia/gpu/d3d12/d3d12_command_processor.cc b/src/xenia/gpu/d3d12/d3d12_command_processor.cc
index ff1c0f567..176728099 100644
--- a/src/xenia/gpu/d3d12/d3d12_command_processor.cc
+++ b/src/xenia/gpu/d3d12/d3d12_command_processor.cc
@@ -419,8 +419,8 @@ ID3D12RootSignature* D3D12CommandProcessor::GetRootSignature(
       GetD3D12Context()->GetD3D12Provider(), desc);
   if (root_signature == nullptr) {
     XELOGE(
-        "Failed to create a root signature with %u pixel textures, %u pixel "
-        "samplers, %u vertex textures and %u vertex samplers",
+        "Failed to create a root signature with {} pixel textures, {} pixel "
+        "samplers, {} vertex textures and {} vertex samplers",
         texture_count_pixel, sampler_count_pixel, texture_count_vertex,
         sampler_count_vertex);
     return nullptr;
@@ -544,7 +544,7 @@ ID3D12Resource* D3D12CommandProcessor::RequestScratchGPUBuffer(
   if (FAILED(device->CreateCommittedResource(
           &ui::d3d12::util::kHeapPropertiesDefault, D3D12_HEAP_FLAG_NONE,
           &buffer_desc, state, nullptr, IID_PPV_ARGS(&buffer)))) {
-    XELOGE("Failed to create a %u MB scratch GPU buffer", size >> 20);
+    XELOGE("Failed to create a {} MB scratch GPU buffer", size >> 20);
     return nullptr;
   }
   if (scratch_buffer_ != nullptr) {
@@ -1492,20 +1492,22 @@ bool D3D12CommandProcessor::IssueDraw(PrimitiveType primitive_type,
           break;
         }
         XELOGW(
-            "Vertex fetch constant %u (%.8X %.8X) has \"invalid\" type! This "
+            "Vertex fetch constant {} ({:08X} {:08X}) has \"invalid\" type! "
+            "This "
             "is incorrect behavior, but you can try bypassing this by "
             "launching Xenia with --gpu_allow_invalid_fetch_constants=true.",
             vfetch_index, vfetch_constant.dword_0, vfetch_constant.dword_1);
         return false;
       default:
-        XELOGW("Vertex fetch constant %u (%.8X %.8X) is completely invalid!",
-               vfetch_index, vfetch_constant.dword_0, vfetch_constant.dword_1);
+        XELOGW(
+            "Vertex fetch constant {} ({:08X} {:08X}) is completely invalid!",
+            vfetch_index, vfetch_constant.dword_0, vfetch_constant.dword_1);
         return false;
     }
     if (!shared_memory_->RequestRange(vfetch_constant.address << 2,
                                       vfetch_constant.size << 2)) {
       XELOGE(
-          "Failed to request vertex buffer at 0x%.8X (size %u) in the shared "
+          "Failed to request vertex buffer at {:#08X} (size {}) in the shared "
           "memory",
           vfetch_constant.address << 2, vfetch_constant.size << 2);
       return false;
@@ -1534,7 +1536,7 @@ bool D3D12CommandProcessor::IssueDraw(PrimitiveType primitive_type,
       uint32_t memexport_format_size =
           GetSupportedMemExportFormatSize(memexport_stream.format);
       if (memexport_format_size == 0) {
-        XELOGE("Unsupported memexport format %s",
+        XELOGE("Unsupported memexport format {}",
                FormatInfo::Get(TextureFormat(uint32_t(memexport_stream.format)))
                    ->name);
         return false;
@@ -1576,7 +1578,7 @@ bool D3D12CommandProcessor::IssueDraw(PrimitiveType primitive_type,
       uint32_t memexport_format_size =
           GetSupportedMemExportFormatSize(memexport_stream.format);
       if (memexport_format_size == 0) {
-        XELOGE("Unsupported memexport format %s",
+        XELOGE("Unsupported memexport format {}",
                FormatInfo::Get(TextureFormat(uint32_t(memexport_stream.format)))
                    ->name);
         return false;
@@ -1607,7 +1609,7 @@ bool D3D12CommandProcessor::IssueDraw(PrimitiveType primitive_type,
     if (!shared_memory_->RequestRange(memexport_range.base_address_dwords << 2,
                                       memexport_range.size_dwords << 2)) {
       XELOGE(
-          "Failed to request memexport stream at 0x%.8X (size %u) in the "
+          "Failed to request memexport stream at {:#08X} (size {}) in the "
           "shared memory",
           memexport_range.base_address_dwords << 2,
           memexport_range.size_dwords << 2);
@@ -1653,7 +1655,7 @@ bool D3D12CommandProcessor::IssueDraw(PrimitiveType primitive_type,
       uint32_t index_buffer_size = index_buffer_info->count * index_size;
       if (!shared_memory_->RequestRange(index_base, index_buffer_size)) {
         XELOGE(
-            "Failed to request index buffer at 0x%.8X (size %u) in the shared "
+            "Failed to request index buffer at {:#08X} (size {}) in the shared "
             "memory",
             index_base, index_buffer_size);
         return false;
@@ -3477,7 +3479,7 @@ ID3D12Resource* D3D12CommandProcessor::RequestReadbackBuffer(uint32_t size) {
             &ui::d3d12::util::kHeapPropertiesReadback, D3D12_HEAP_FLAG_NONE,
             &buffer_desc, D3D12_RESOURCE_STATE_COPY_DEST, nullptr,
             IID_PPV_ARGS(&buffer)))) {
-      XELOGE("Failed to create a %u MB readback buffer", size >> 20);
+      XELOGE("Failed to create a {} MB readback buffer", size >> 20);
       return nullptr;
     }
     if (readback_buffer_ != nullptr) {
diff --git a/src/xenia/gpu/d3d12/pipeline_cache.cc b/src/xenia/gpu/d3d12/pipeline_cache.cc
index 859cc713d..2f62c3656 100644
--- a/src/xenia/gpu/d3d12/pipeline_cache.cc
+++ b/src/xenia/gpu/d3d12/pipeline_cache.cc
@@ -363,8 +363,7 @@ void PipelineCache::InitializeShaderStorage(
         delete shader;
       }
     }
-    XELOGGPU("Translated %zu shaders from the storage in %" PRIu64
-             " milliseconds",
+    XELOGGPU("Translated {} shaders from the storage in {} milliseconds",
              shaders_translated,
              (xe::Clock::QueryHostTickCount() -
               shader_storage_initialization_start) *
@@ -580,8 +579,8 @@ void PipelineCache::InitializeShaderStorage(
           }
         }
         XELOGGPU(
-            "Created %zu graphics pipeline state objects from the storage in "
-            "%" PRIu64 " milliseconds",
+            "Created {} graphics pipeline state objects from the storage in {} "
+            "milliseconds",
             pipeline_states_created,
             (xe::Clock::QueryHostTickCount() -
              pipeline_state_storage_initialization_start_) *
@@ -770,7 +769,7 @@ Shader::HostVertexShaderType PipelineCache::GetHostVertexShaderTypeIfValid()
       // tessellation.
   }
   XELOGE(
-      "Unsupported tessellation mode %u for primitive type %u. Report the game "
+      "Unsupported tessellation mode {} for primitive type {}. Report the game "
       "to Xenia developers!",
       uint32_t(tessellation_mode), uint32_t(vgt_draw_initiator.prim_type));
   return Shader::HostVertexShaderType(-1);
@@ -931,7 +930,7 @@ bool PipelineCache::TranslateShader(
   // Perform translation.
   // If this fails the shader will be marked as invalid and ignored later.
   if (!translator.Translate(shader, cntl, host_vertex_shader_type)) {
-    XELOGE("Shader %.16" PRIX64 " translation failed; marking as ignored",
+    XELOGE("Shader {:016X} translation failed; marking as ignored",
            shader->ucode_data_hash());
     return false;
   }
@@ -973,7 +972,7 @@ bool PipelineCache::TranslateShader(
     } else {
       host_shader_type = "pixel";
     }
-    XELOGGPU("Generated %s shader (%db) - hash %.16" PRIX64 ":\n%s\n",
+    XELOGGPU("Generated {} shader ({}b) - hash {:016X}:\n{}\n",
              host_shader_type, shader->ucode_dword_count() * 4,
              shader->ucode_data_hash(), shader->ucode_disassembly().c_str());
   }
@@ -992,7 +991,7 @@ bool PipelineCache::TranslateShader(
   if (cvars::d3d12_dxbc_disasm) {
     auto provider = command_processor_->GetD3D12Context()->GetD3D12Provider();
     if (!shader->DisassembleDxbc(provider)) {
-      XELOGE("Failed to disassemble DXBC shader %.16" PRIX64,
+      XELOGE("Failed to disassemble DXBC shader {:016X}",
              shader->ucode_data_hash());
     }
   }
@@ -1364,12 +1363,13 @@ ID3D12PipelineState* PipelineCache::CreateD3D12PipelineState(
   const PipelineDescription& description = runtime_description.description;
 
   if (runtime_description.pixel_shader != nullptr) {
-    XELOGGPU("Creating graphics pipeline state with VS %.16" PRIX64
-             ", PS %.16" PRIX64,
-             runtime_description.vertex_shader->ucode_data_hash(),
-             runtime_description.pixel_shader->ucode_data_hash());
+    XELOGGPU(
+        "Creating graphics pipeline state with VS {:016X}"
+        ", PS {:016X}",
+        runtime_description.vertex_shader->ucode_data_hash(),
+        runtime_description.pixel_shader->ucode_data_hash());
   } else {
-    XELOGGPU("Creating graphics pipeline state with VS %.16" PRIX64,
+    XELOGGPU("Creating graphics pipeline state with VS {:016X}",
              runtime_description.vertex_shader->ucode_data_hash());
   }
 
@@ -1395,7 +1395,7 @@ ID3D12PipelineState* PipelineCache::CreateD3D12PipelineState(
 
   // Primitive topology, vertex, hull, domain and geometry shaders.
   if (!runtime_description.vertex_shader->is_translated()) {
-    XELOGE("Vertex shader %.16" PRIX64 " not translated",
+    XELOGE("Vertex shader {:016X} not translated",
            runtime_description.vertex_shader->ucode_data_hash());
     assert_always();
     return nullptr;
@@ -1404,10 +1404,10 @@ ID3D12PipelineState* PipelineCache::CreateD3D12PipelineState(
       description.host_vertex_shader_type;
   if (runtime_description.vertex_shader->host_vertex_shader_type() !=
       host_vertex_shader_type) {
-    XELOGE("Vertex shader %.16" PRIX64
-           " translated into the wrong host shader "
-           "type",
-           runtime_description.vertex_shader->ucode_data_hash());
+    XELOGE(
+        "Vertex shader {:016X} translated into the wrong host shader "
+        "type",
+        runtime_description.vertex_shader->ucode_data_hash());
     assert_always();
     return nullptr;
   }
@@ -1511,7 +1511,7 @@ ID3D12PipelineState* PipelineCache::CreateD3D12PipelineState(
   // Pixel shader.
   if (runtime_description.pixel_shader != nullptr) {
     if (!runtime_description.pixel_shader->is_translated()) {
-      XELOGE("Pixel shader %.16" PRIX64 " not translated",
+      XELOGE("Pixel shader {:016X} not translated",
              runtime_description.pixel_shader->ucode_data_hash());
       assert_always();
       return nullptr;
@@ -1681,12 +1681,13 @@ ID3D12PipelineState* PipelineCache::CreateD3D12PipelineState(
   if (FAILED(device->CreateGraphicsPipelineState(&state_desc,
                                                  IID_PPV_ARGS(&state)))) {
     if (runtime_description.pixel_shader != nullptr) {
-      XELOGE("Failed to create graphics pipeline state with VS %.16" PRIX64
-             ", PS %.16" PRIX64,
-             runtime_description.vertex_shader->ucode_data_hash(),
-             runtime_description.pixel_shader->ucode_data_hash());
+      XELOGE(
+          "Failed to create graphics pipeline state with VS {:016X}"
+          ", PS {:016X}",
+          runtime_description.vertex_shader->ucode_data_hash(),
+          runtime_description.pixel_shader->ucode_data_hash());
     } else {
-      XELOGE("Failed to create graphics pipeline state with VS %.16" PRIX64,
+      XELOGE("Failed to create graphics pipeline state with VS {:016X}",
              runtime_description.vertex_shader->ucode_data_hash());
     }
     return nullptr;
diff --git a/src/xenia/gpu/d3d12/primitive_converter.cc b/src/xenia/gpu/d3d12/primitive_converter.cc
index db47ba804..8449573e9 100644
--- a/src/xenia/gpu/d3d12/primitive_converter.cc
+++ b/src/xenia/gpu/d3d12/primitive_converter.cc
@@ -702,7 +702,7 @@ void* PrimitiveConverter::AllocateIndices(
       buffer_pool_->Request(command_processor_->GetCurrentFrame(), size,
                             nullptr, nullptr, &gpu_address);
   if (mapping == nullptr) {
-    XELOGE("Failed to allocate space for %u converted %u-bit vertex indices",
+    XELOGE("Failed to allocate space for {} converted {}-bit vertex indices",
            count, format == IndexFormat::kInt32 ? 32 : 16);
     return nullptr;
   }
diff --git a/src/xenia/gpu/d3d12/render_target_cache.cc b/src/xenia/gpu/d3d12/render_target_cache.cc
index f590566af..c498baeaf 100644
--- a/src/xenia/gpu/d3d12/render_target_cache.cc
+++ b/src/xenia/gpu/d3d12/render_target_cache.cc
@@ -266,7 +266,7 @@ bool RenderTargetCache::Initialize(const TextureCache* texture_cache) {
         (!rov_used && edram_store_pipelines_[i] == nullptr) ||
         (load_2x_resolve_pipeline_used &&
          edram_load_2x_resolve_pipelines_[i] == nullptr)) {
-      XELOGE("Failed to create the EDRAM load/store pipelines for mode %u", i);
+      XELOGE("Failed to create the EDRAM load/store pipelines for mode {}", i);
       Shutdown();
       return false;
     }
@@ -824,7 +824,7 @@ bool RenderTargetCache::UpdateRenderTargets(const D3D12Shader* pixel_shader) {
       }
 #endif
     }
-    XELOGGPU("RT Cache: %s update - pitch %u, samples %u, RTs to attach %u",
+    XELOGGPU("RT Cache: {} update - pitch {}, samples {}, RTs to attach {}",
              full_update ? "Full" : "Partial", surface_pitch,
              rb_surface_info.msaa_samples, render_targets_to_attach);
 
@@ -954,7 +954,7 @@ bool RenderTargetCache::UpdateRenderTargets(const D3D12Shader* pixel_shader) {
         if (render_target == nullptr) {
           continue;
         }
-        XELOGGPU("RT Color %u: base %u, format %u", i, edram_bases[i],
+        XELOGGPU("RT Color {}: base {}, format {}", i, edram_bases[i],
                  formats[i]);
         command_processor_->PushTransitionBarrier(
             render_target->resource, render_target->state,
@@ -973,7 +973,7 @@ bool RenderTargetCache::UpdateRenderTargets(const D3D12Shader* pixel_shader) {
       RenderTarget* depth_render_target = depth_binding.render_target;
       current_pipeline_render_targets_[4].guest_render_target = 4;
       if (depth_binding.is_bound && depth_render_target != nullptr) {
-        XELOGGPU("RT Depth: base %u, format %u", edram_bases[4], formats[4]);
+        XELOGGPU("RT Depth: base {}, format {}", edram_bases[4], formats[4]);
         command_processor_->PushTransitionBarrier(
             depth_render_target->resource, depth_render_target->state,
             D3D12_RESOURCE_STATE_DEPTH_WRITE);
@@ -1165,8 +1165,8 @@ bool RenderTargetCache::Resolve(SharedMemory* shared_memory,
   rect.bottom = std::min(rect.bottom, scissor.bottom);
 
   XELOGGPU(
-      "Resolve: (%d,%d)->(%d,%d) of RT %u (pitch %u, %u sample%s, format %u) "
-      "at %u",
+      "Resolve: ({},{})->({},{}) of RT {} (pitch {}, {} sample{}, format {}) "
+      "at {}",
       rect.left, rect.top, rect.right, rect.bottom, surface_index,
       surface_pitch, 1 << uint32_t(rb_surface_info.msaa_samples),
       rb_surface_info.msaa_samples != MsaaSamples::k1X ? "s" : "",
@@ -1340,8 +1340,8 @@ bool RenderTargetCache::ResolveCopy(SharedMemory* shared_memory,
   bool dest_swap = !is_depth && rb_copy_dest_info.copy_dest_swap;
 
   XELOGGPU(
-      "Resolve: Copying samples %u to 0x%.8X (%ux%u, %cD), destination Z %u, "
-      "destination format %s, exponent bias %d, red and blue %sswapped",
+      "Resolve: Copying samples {} to {:#08X} ({}x{}, {}D), destination Z {}, "
+      "destination format {}, exponent bias {}, red and blue {}swapped",
       uint32_t(sample_select), dest_address, dest_pitch, dest_height,
       rb_copy_dest_info.copy_dest_array ? '3' : '2', dest_z,
       dest_format_info->name, dest_exp_bias, dest_swap ? "" : "not ");
@@ -1532,7 +1532,7 @@ bool RenderTargetCache::ResolveCopy(SharedMemory* shared_memory,
         texture_cache->GetResolveDXGIFormat(dest_format);
     if (dest_dxgi_format == DXGI_FORMAT_UNKNOWN) {
       XELOGE(
-          "No resolve pipeline for destination format %s - tell Xenia "
+          "No resolve pipeline for destination format {} - tell Xenia "
           "developers!",
           FormatInfo::Get(dest_format)->name);
       return false;
@@ -1864,7 +1864,7 @@ bool RenderTargetCache::ResolveClear(uint32_t edram_base,
     }
   }
 
-  XELOGGPU("Resolve: Clearing the %s render target",
+  XELOGGPU("Resolve: Clearing the {} render target",
            is_depth ? "depth" : "color");
 
   // Calculate the layout.
@@ -1980,7 +1980,7 @@ ID3D12PipelineState* RenderTargetCache::GetResolvePipeline(
   ID3D12PipelineState* pipeline;
   if (FAILED(device->CreateGraphicsPipelineState(&pipeline_desc,
                                                  IID_PPV_ARGS(&pipeline)))) {
-    XELOGE("Failed to create the resolve pipeline for DXGI format %u",
+    XELOGE("Failed to create the resolve pipeline for DXGI format {}",
            dest_format);
     return nullptr;
   }
@@ -2063,8 +2063,8 @@ RenderTargetCache::ResolveTarget* RenderTargetCache::FindOrCreateResolveTarget(
   if (heap_page_count == 0 || heap_page_count > kHeap4MBPages) {
     assert_always();
     XELOGE(
-        "%ux%u resolve target with DXGI format %u can't fit in a heap, "
-        "needs %u bytes - tell Xenia developers to increase the heap size!",
+        "{}x{} resolve target with DXGI format {} can't fit in a heap, "
+        "needs {} bytes - tell Xenia developers to increase the heap size!",
         uint32_t(resource_desc.Width), resource_desc.Height, format,
         uint32_t(allocation_info.SizeInBytes));
     return nullptr;
@@ -2090,8 +2090,8 @@ RenderTargetCache::ResolveTarget* RenderTargetCache::FindOrCreateResolveTarget(
           heaps_[heap_index], (min_heap_page_first % kHeap4MBPages) << 22,
           &resource_desc, state, nullptr, IID_PPV_ARGS(&resource)))) {
     XELOGE(
-        "Failed to create a placed resource for %ux%u resolve target with DXGI "
-        "format %u at heap 4 MB pages %u:%u",
+        "Failed to create a placed resource for {}x{} resolve target with DXGI "
+        "format {} at heap 4 MB pages {}:{}",
         uint32_t(resource_desc.Width), resource_desc.Height, format,
         min_heap_page_first, min_heap_page_first + heap_page_count - 1);
     return nullptr;
@@ -2101,8 +2101,8 @@ RenderTargetCache::ResolveTarget* RenderTargetCache::FindOrCreateResolveTarget(
           &ui::d3d12::util::kHeapPropertiesDefault, D3D12_HEAP_FLAG_NONE,
           &resource_desc, state, nullptr, IID_PPV_ARGS(&resource)))) {
     XELOGE(
-        "Failed to create a committed resource for %ux%u resolve target with "
-        "DXGI format %u",
+        "Failed to create a committed resource for {}x{} resolve target with "
+        "DXGI format {}",
         uint32_t(resource_desc.Width), resource_desc.Height, format);
     return nullptr;
   }
@@ -2397,7 +2397,7 @@ bool RenderTargetCache::MakeHeapResident(uint32_t heap_index) {
   heap_desc.Flags = D3D12_HEAP_FLAG_ALLOW_ONLY_RT_DS_TEXTURES;
   if (FAILED(
           device->CreateHeap(&heap_desc, IID_PPV_ARGS(&heaps_[heap_index])))) {
-    XELOGE("Failed to create a %u MB heap for render targets",
+    XELOGE("Failed to create a {} MB heap for render targets",
            kHeap4MBPages * 4);
     return false;
   }
@@ -2422,7 +2422,7 @@ bool RenderTargetCache::EnsureRTVHeapAvailable(bool is_depth) {
   ID3D12DescriptorHeap* new_d3d_heap;
   if (FAILED(device->CreateDescriptorHeap(&heap_desc,
                                           IID_PPV_ARGS(&new_d3d_heap)))) {
-    XELOGE("Failed to create a heap for %u %s buffer descriptors",
+    XELOGE("Failed to create a heap for {} {} buffer descriptors",
            kRenderTargetDescriptorHeapSize, is_depth ? "depth" : "color");
     return false;
   }
@@ -2530,8 +2530,8 @@ RenderTargetCache::RenderTarget* RenderTargetCache::FindOrCreateRenderTarget(
           heaps_[heap_index], (heap_page_first % kHeap4MBPages) << 22,
           &resource_desc, state, nullptr, IID_PPV_ARGS(&resource)))) {
     XELOGE(
-        "Failed to create a placed resource for %ux%u %s render target with "
-        "format %u at heap 4 MB pages %u:%u",
+        "Failed to create a placed resource for {}x{} {} render target with "
+        "format {} at heap 4 MB pages {}:{}",
         uint32_t(resource_desc.Width), resource_desc.Height,
         key.is_depth ? "depth" : "color", key.format, heap_page_first,
         heap_page_first + heap_page_count - 1);
@@ -2542,8 +2542,8 @@ RenderTargetCache::RenderTarget* RenderTargetCache::FindOrCreateRenderTarget(
           &ui::d3d12::util::kHeapPropertiesDefault, D3D12_HEAP_FLAG_NONE,
           &resource_desc, state, nullptr, IID_PPV_ARGS(&resource)))) {
     XELOGE(
-        "Failed to create a committed resource for %ux%u %s render target with "
-        "format %u",
+        "Failed to create a committed resource for {}x{} {} render target with "
+        "format {}",
         uint32_t(resource_desc.Width), resource_desc.Height,
         key.is_depth ? "depth" : "color", key.format);
     return nullptr;
@@ -2598,12 +2598,12 @@ RenderTargetCache::RenderTarget* RenderTargetCache::FindOrCreateRenderTarget(
                     render_targets_.size());
 #if 0
   XELOGGPU(
-      "Created %ux%u %s render target with format %u at heap 4 MB pages %u:%u",
+      "Created {}x{} {} render target with format {} at heap 4 MB pages {}:{}",
       uint32_t(resource_desc.Width), resource_desc.Height,
       key.is_depth ? "depth" : "color", key.format, heap_page_first,
       heap_page_first + heap_page_count - 1);
 #else
-  XELOGGPU("Created %ux%u %s render target with format %u",
+  XELOGGPU("Created {}x{} {} render target with format {}",
            uint32_t(resource_desc.Width), resource_desc.Height,
            key.is_depth ? "depth" : "color", key.format);
 #endif
diff --git a/src/xenia/gpu/d3d12/shared_memory.cc b/src/xenia/gpu/d3d12/shared_memory.cc
index e87567d01..cb6c04bad 100644
--- a/src/xenia/gpu/d3d12/shared_memory.cc
+++ b/src/xenia/gpu/d3d12/shared_memory.cc
@@ -805,7 +805,7 @@ bool SharedMemory::InitializeTraceSubmitDownloads() {
           &gpu_written_buffer_desc, D3D12_RESOURCE_STATE_COPY_DEST, nullptr,
           IID_PPV_ARGS(&trace_gpu_written_buffer_)))) {
     XELOGE(
-        "Shared memory: Failed to create a %u KB GPU-written memory download "
+        "Shared memory: Failed to create a {} KB GPU-written memory download "
         "buffer for frame tracing",
         gpu_written_page_count << page_size_log2_ >> 10);
     ResetTraceGPUWrittenBuffer();
diff --git a/src/xenia/gpu/d3d12/texture_cache.cc b/src/xenia/gpu/d3d12/texture_cache.cc
index e5919466a..36528b611 100644
--- a/src/xenia/gpu/d3d12/texture_cache.cc
+++ b/src/xenia/gpu/d3d12/texture_cache.cc
@@ -1004,7 +1004,7 @@ bool TextureCache::Initialize() {
     load_pipelines_[i] = ui::d3d12::util::CreateComputePipeline(
         device, mode_info.shader, mode_info.shader_size, load_root_signature_);
     if (load_pipelines_[i] == nullptr) {
-      XELOGE("Failed to create the texture loading pipeline for mode %u", i);
+      XELOGE("Failed to create the texture loading pipeline for mode {}", i);
       Shutdown();
       return false;
     }
@@ -1015,7 +1015,7 @@ bool TextureCache::Initialize() {
       if (load_pipelines_2x_[i] == nullptr) {
         XELOGE(
             "Failed to create the 2x-scaled texture loading pipeline for mode "
-            "%u",
+            "{}",
             i);
         Shutdown();
         return false;
@@ -1028,7 +1028,7 @@ bool TextureCache::Initialize() {
         device, mode_info.shader, mode_info.shader_size,
         resolve_tile_root_signature_);
     if (resolve_tile_pipelines_[i] == nullptr) {
-      XELOGE("Failed to create the texture tiling pipeline for mode %u", i);
+      XELOGE("Failed to create the texture tiling pipeline for mode {}", i);
       Shutdown();
       return false;
     }
@@ -1243,7 +1243,7 @@ void TextureCache::EndFrame() {
       XELOGE("Unsupported texture formats used in the frame:");
       unsupported_header_written = true;
     }
-    XELOGE("* %s%s%s%s", FormatInfo::Get(TextureFormat(i))->name,
+    XELOGE("* {}{}{}{}", FormatInfo::Get(TextureFormat(i))->name,
            unsupported_features & kUnsupportedResourceBit ? " resource" : "",
            unsupported_features & kUnsupportedUnormBit ? " unorm" : "",
            unsupported_features & kUnsupportedSnormBit ? " snorm" : "");
@@ -2094,7 +2094,8 @@ void TextureCache::BindingInfoFromFetchConstant(
         break;
       }
       XELOGW(
-          "Texture fetch constant (%.8X %.8X %.8X %.8X %.8X %.8X) has "
+          "Texture fetch constant ({:08X} {:08X} {:08X} {:08X} {:08X} {:08X}) "
+          "has "
           "\"invalid\" type! This is incorrect behavior, but you can try "
           "bypassing this by launching Xenia with "
           "--gpu_allow_invalid_fetch_constants=true.",
@@ -2103,7 +2104,8 @@ void TextureCache::BindingInfoFromFetchConstant(
       return;
     default:
       XELOGW(
-          "Texture fetch constant (%.8X %.8X %.8X %.8X %.8X %.8X) is "
+          "Texture fetch constant ({:08X} {:08X} {:08X} {:08X} {:08X} {:08X}) "
+          "is "
           "completely invalid!",
           fetch.dword_0, fetch.dword_1, fetch.dword_2, fetch.dword_3,
           fetch.dword_4, fetch.dword_5);
@@ -2121,7 +2123,7 @@ void TextureCache::BindingInfoFromFetchConstant(
   }
   if (fetch.dimension == Dimension::k1D && width > 8192) {
     XELOGE(
-        "1D texture is too wide (%u) - ignoring! "
+        "1D texture is too wide ({}) - ignoring! "
         "Report the game to Xenia developers",
         width);
     return;
@@ -2175,8 +2177,8 @@ void TextureCache::BindingInfoFromFetchConstant(
 
 void TextureCache::LogTextureKeyAction(TextureKey key, const char* action) {
   XELOGGPU(
-      "%s %s %s%ux%ux%u %s %s texture with %u %spacked mip level%s, "
-      "base at 0x%.8X, mips at 0x%.8X",
+      "{} {} {}{}x{}x{} {} {} texture with {} {}packed mip level{}, "
+      "base at {:#08X}, mips at {:#08X}",
       action, key.tiled ? "tiled" : "linear",
       key.scaled_resolve ? "2x-scaled " : "", key.width, key.height, key.depth,
       dimension_names_[uint32_t(key.dimension)],
@@ -2188,8 +2190,8 @@ void TextureCache::LogTextureKeyAction(TextureKey key, const char* action) {
 void TextureCache::LogTextureAction(const Texture* texture,
                                     const char* action) {
   XELOGGPU(
-      "%s %s %s%ux%ux%u %s %s texture with %u %spacked mip level%s, "
-      "base at 0x%.8X (size %u), mips at 0x%.8X (size %u)",
+      "{} {} {}{}x{}x{} {} {} texture with {} {}packed mip level{}, "
+      "base at {:#08X} (size {}), mips at {:#08X} (size {})",
       action, texture->key.tiled ? "tiled" : "linear",
       texture->key.scaled_resolve ? "2x-scaled " : "", texture->key.width,
       texture->key.height, texture->key.depth,
diff --git a/src/xenia/gpu/graphics_system.cc b/src/xenia/gpu/graphics_system.cc
index 26046d88e..e54792a27 100644
--- a/src/xenia/gpu/graphics_system.cc
+++ b/src/xenia/gpu/graphics_system.cc
@@ -194,7 +194,7 @@ uint32_t GraphicsSystem::ReadRegister(uint32_t addr) {
       return 0x050002D0;
     default:
       if (!register_file_.GetRegisterInfo(r)) {
-        XELOGE("GPU: Read from unknown register (%.4X)", r);
+        XELOGE("GPU: Read from unknown register ({:04X})", r);
       }
   }
 
@@ -212,7 +212,7 @@ void GraphicsSystem::WriteRegister(uint32_t addr, uint32_t value) {
     case 0x1844:  // AVIVO_D1GRPH_PRIMARY_SURFACE_ADDRESS
       break;
     default:
-      XELOGW("Unknown GPU register %.4X write: %.8X", r, value);
+      XELOGW("Unknown GPU register {:04X} write: {:08X}", r, value);
       break;
   }
 
@@ -233,7 +233,7 @@ void GraphicsSystem::SetInterruptCallback(uint32_t callback,
                                           uint32_t user_data) {
   interrupt_callback_ = callback;
   interrupt_callback_data_ = user_data;
-  XELOGGPU("SetInterruptCallback(%.4X, %.4X)", callback, user_data);
+  XELOGGPU("SetInterruptCallback({:08X}, {:08X})", callback, user_data);
 }
 
 void GraphicsSystem::DispatchInterruptCallback(uint32_t source, uint32_t cpu) {
@@ -250,7 +250,7 @@ void GraphicsSystem::DispatchInterruptCallback(uint32_t source, uint32_t cpu) {
   }
   thread->SetActiveCpu(cpu);
 
-  // XELOGGPU("Dispatching GPU interrupt at %.8X w/ mode %d on cpu %d",
+  // XELOGGPU("Dispatching GPU interrupt at {:08X} w/ mode {} on cpu {}",
   //          interrupt_callback_, source, cpu);
 
   uint64_t args[] = {source, interrupt_callback_data_};
diff --git a/src/xenia/gpu/shader_compiler_main.cc b/src/xenia/gpu/shader_compiler_main.cc
index ab67e9d15..77bda5ab5 100644
--- a/src/xenia/gpu/shader_compiler_main.cc
+++ b/src/xenia/gpu/shader_compiler_main.cc
@@ -81,8 +81,8 @@ int shader_compiler_main(const std::vector<std::string>& args) {
 
   auto input_file = filesystem::OpenFile(cvars::shader_input, "rb");
   if (!input_file) {
-    XELOGE("Unable to open input file: %s",
-           xe::path_to_utf8(cvars::shader_input).c_str());
+    XELOGE("Unable to open input file: {}",
+           xe::path_to_utf8(cvars::shader_input));
     return 1;
   }
   fseek(input_file, 0, SEEK_END);
@@ -92,8 +92,8 @@ int shader_compiler_main(const std::vector<std::string>& args) {
   fread(ucode_dwords.data(), 4, ucode_dwords.size(), input_file);
   fclose(input_file);
 
-  XELOGI("Opened %s as a %s shader, %" PRId64 " words (%" PRId64 " bytes).",
-         xe::path_to_utf8(cvars::shader_input).c_str(),
+  XELOGI("Opened {} as a {} shader, {} words ({} bytes).",
+         xe::path_to_utf8(cvars::shader_input),
          shader_type == ShaderType::kVertex ? "vertex" : "pixel",
          ucode_dwords.size(), ucode_dwords.size() * 4);
 
diff --git a/src/xenia/gpu/shader_translator.cc b/src/xenia/gpu/shader_translator.cc
index 4d4285092..bce8af1ab 100644
--- a/src/xenia/gpu/shader_translator.cc
+++ b/src/xenia/gpu/shader_translator.cc
@@ -1299,7 +1299,7 @@ void ShaderTranslator::ParseAluVectorOperation(const AluInstruction& op,
           // assert_always();
           XELOGE(
               "ShaderTranslator::ParseAluVectorOperation: Unsupported write to "
-              "export %d",
+              "export {}",
               dest_num);
           i.vector_result.storage_target = InstructionStorageTarget::kNone;
           i.vector_result.storage_index = 0;
@@ -1343,7 +1343,7 @@ void ShaderTranslator::ParseAluVectorOperation(const AluInstruction& op,
       default:
         XELOGE(
             "ShaderTranslator::ParseAluVectorOperation: Unsupported write to "
-            "export %d",
+            "export {}",
             dest_num);
         i.vector_result.storage_target = InstructionStorageTarget::kNone;
         i.vector_result.storage_index = 0;
@@ -1468,7 +1468,7 @@ void ShaderTranslator::ParseAluScalarOperation(const AluInstruction& op,
           // assert_always();
           XELOGE(
               "ShaderTranslator::ParseAluScalarOperation: Unsupported write to "
-              "export %d",
+              "export {}",
               dest_num);
           i.scalar_result.storage_target = InstructionStorageTarget::kNone;
           i.scalar_result.storage_index = 0;
diff --git a/src/xenia/gpu/spirv_shader_translator.cc b/src/xenia/gpu/spirv_shader_translator.cc
index 67fbb585e..5680f9eca 100644
--- a/src/xenia/gpu/spirv_shader_translator.cc
+++ b/src/xenia/gpu/spirv_shader_translator.cc
@@ -674,7 +674,7 @@ void SpirvShaderTranslator::PostTranslation(Shader* shader) {
         reinterpret_cast<const uint32_t*>(shader->translated_binary().data()),
         shader->translated_binary().size() / sizeof(uint32_t));
     if (validation->has_error()) {
-      XELOGE("SPIR-V Shader Validation failed! Error: %s",
+      XELOGE("SPIR-V Shader Validation failed! Error: {}",
              validation->error_string());
     }
   }
diff --git a/src/xenia/gpu/texture_dump.cc b/src/xenia/gpu/texture_dump.cc
index 9340a7e33..0ae52b80c 100644
--- a/src/xenia/gpu/texture_dump.cc
+++ b/src/xenia/gpu/texture_dump.cc
@@ -85,7 +85,7 @@ void TextureDump(const TextureInfo& src, void* buffer, size_t length) {
       assert_unhandled_case(src.format);
       std::memset(&dds_header.pixel_format, 0xCD,
                   sizeof(dds_header.pixel_format));
-      XELOGW("Skipping %s for texture dump.", src.format_info()->name);
+      XELOGW("Skipping {} for texture dump.", src.format_info()->name);
       return;
     }
   }
@@ -93,12 +93,12 @@ void TextureDump(const TextureInfo& src, void* buffer, size_t length) {
   dds_header.caps[0] = 8u | 0x1000u;
 
   static int dump_counter = 0;
-  char path[256];
-  sprintf(path, "texture_dumps\\%05d_%.8X_%.8X_%s.dds", dump_counter++,
-          src.memory.base_address, src.memory.mip_address,
-          src.format_info()->name);
+  std::filesystem::path path = "texture_dumps";
+  path /= fmt::format("{:05d}_{:08X}_{:08X}_{:08X}.dds", dump_counter++,
+                      src.memory.base_address, src.memory.mip_address,
+                      src.format_info()->name);
 
-  FILE* handle = fopen(path, "wb");
+  FILE* handle = filesystem::OpenFile(path, "wb");
   if (handle) {
     const uint32_t signature = ' SDD';
     fwrite(&signature, sizeof(signature), 1, handle);
diff --git a/src/xenia/gpu/texture_info.cc b/src/xenia/gpu/texture_info.cc
index 9070048e0..9cd80f807 100644
--- a/src/xenia/gpu/texture_info.cc
+++ b/src/xenia/gpu/texture_info.cc
@@ -79,7 +79,7 @@ bool TextureInfo::Prepare(const xe_gpu_texture_fetch_t& fetch,
   info.has_packed_mips = fetch.packed_mips;
 
   if (info.format_info()->format == TextureFormat::kUnknown) {
-    XELOGE("Attempting to fetch from unsupported texture format %d",
+    XELOGE("Attempting to fetch from unsupported texture format {}",
            info.format);
     info.memory.base_address = fetch.base_address << 12;
     info.memory.mip_address = fetch.mip_address << 12;
diff --git a/src/xenia/gpu/trace_dump.cc b/src/xenia/gpu/trace_dump.cc
index 0d9405fa1..984984c4a 100644
--- a/src/xenia/gpu/trace_dump.cc
+++ b/src/xenia/gpu/trace_dump.cc
@@ -63,7 +63,7 @@ int TraceDump::Main(const std::vector<std::string>& args) {
 
   // Normalize the path and make absolute.
   auto abs_path = std::filesystem::absolute(path);
-  XELOGI("Loading trace file %s...", xe::path_to_utf8(abs_path).c_str());
+  XELOGI("Loading trace file {}...", xe::path_to_utf8(abs_path));
 
   if (!Setup()) {
     XELOGE("Unable to setup trace dump tool");
@@ -96,7 +96,7 @@ bool TraceDump::Setup() {
   X_STATUS result = emulator_->Setup(
       nullptr, nullptr, [this]() { return CreateGraphicsSystem(); }, nullptr);
   if (XFAILED(result)) {
-    XELOGE("Failed to setup emulator: %.8X", result);
+    XELOGE("Failed to setup emulator: {:08X}", result);
     return false;
   }
   graphics_system_ = emulator_->graphics_system();
diff --git a/src/xenia/gpu/trace_reader.cc b/src/xenia/gpu/trace_reader.cc
index 26fdd3abe..ae90f7a64 100644
--- a/src/xenia/gpu/trace_reader.cc
+++ b/src/xenia/gpu/trace_reader.cc
@@ -37,7 +37,7 @@ bool TraceReader::Open(const std::filesystem::path& path) {
   // Verify version.
   auto header = reinterpret_cast<const TraceHeader*>(trace_data_);
   if (header->version != kTraceFormatVersion) {
-    XELOGE("Trace format version mismatch, code has %u, file has %u",
+    XELOGE("Trace format version mismatch, code has {}, file has {}",
            kTraceFormatVersion, header->version);
     if (header->version < kTraceFormatVersion) {
       XELOGE("You need to regenerate your trace for the latest version");
@@ -45,13 +45,12 @@ bool TraceReader::Open(const std::filesystem::path& path) {
     return false;
   }
 
-  auto path_str = xe::path_to_utf8(path);
-  XELOGI("Mapped %" PRId64 "b trace from %s", trace_size_, path_str.c_str());
-  XELOGI("   Version: %u", header->version);
+  XELOGI("Mapped {}b trace from {}", trace_size_, xe::path_to_utf8(path));
+  XELOGI("   Version: {}", header->version);
   auto commit_str = std::string(header->build_commit_sha,
                                 xe::countof(header->build_commit_sha));
-  XELOGI("    Commit: %s", commit_str.c_str());
-  XELOGI("  Title ID: %u", header->title_id);
+  XELOGI("    Commit: {}", commit_str);
+  XELOGI("  Title ID: {}", header->title_id);
 
   ParseTrace();
 
diff --git a/src/xenia/gpu/trace_viewer.cc b/src/xenia/gpu/trace_viewer.cc
index e30ce4428..b05aa7130 100644
--- a/src/xenia/gpu/trace_viewer.cc
+++ b/src/xenia/gpu/trace_viewer.cc
@@ -126,7 +126,7 @@ bool TraceViewer::Setup() {
       window_.get(), nullptr, [this]() { return CreateGraphicsSystem(); },
       nullptr);
   if (XFAILED(result)) {
-    XELOGE("Failed to setup emulator: %.8X", result);
+    XELOGE("Failed to setup emulator: {:08X}", result);
     return false;
   }
   memory_ = emulator_->memory();
diff --git a/src/xenia/gpu/vulkan/buffer_cache.cc b/src/xenia/gpu/vulkan/buffer_cache.cc
index af30d9da0..afd8a6ebc 100644
--- a/src/xenia/gpu/vulkan/buffer_cache.cc
+++ b/src/xenia/gpu/vulkan/buffer_cache.cc
@@ -509,7 +509,7 @@ std::pair<VkBuffer, VkDeviceSize> BufferCache::UploadVertexBuffer(
     // OOM.
     XELOGW(
         "Failed to allocate transient data for vertex buffer! Wanted to "
-        "allocate %u bytes.",
+        "allocate {} bytes.",
         upload_size);
     return {nullptr, VK_WHOLE_SIZE};
   }
@@ -648,14 +648,16 @@ VkDescriptorSet BufferCache::PrepareVertexSet(
           break;
         }
         XELOGW(
-            "Vertex fetch constant %u (%.8X %.8X) has \"invalid\" type! This "
+            "Vertex fetch constant {} ({:08X} {:08X}) has \"invalid\" type! "
+            "This "
             "is incorrect behavior, but you can try bypassing this by "
             "launching Xenia with --gpu_allow_invalid_fetch_constants=true.",
             vertex_binding.fetch_constant, fetch->dword_0, fetch->dword_1);
         return nullptr;
       default:
-        XELOGW("Vertex fetch constant %u (%.8X %.8X) is completely invalid!",
-               vertex_binding.fetch_constant, fetch->dword_0, fetch->dword_1);
+        XELOGW(
+            "Vertex fetch constant {} ({:08X} {:08X}) is completely invalid!",
+            vertex_binding.fetch_constant, fetch->dword_0, fetch->dword_1);
         return nullptr;
     }
 
diff --git a/src/xenia/gpu/vulkan/pipeline_cache.cc b/src/xenia/gpu/vulkan/pipeline_cache.cc
index a1b7ff1d5..85fdd786b 100644
--- a/src/xenia/gpu/vulkan/pipeline_cache.cc
+++ b/src/xenia/gpu/vulkan/pipeline_cache.cc
@@ -340,7 +340,7 @@ VkPipeline PipelineCache::GetPipeline(const RenderState* render_state,
   auto result = vkCreateGraphicsPipelines(*device_, pipeline_cache_, 1,
                                           &pipeline_info, nullptr, &pipeline);
   if (result != VK_SUCCESS) {
-    XELOGE("vkCreateGraphicsPipelines failed with code %d", result);
+    XELOGE("vkCreateGraphicsPipelines failed with code {}", result);
     assert_always();
     return nullptr;
   }
@@ -379,10 +379,10 @@ bool PipelineCache::TranslateShader(VulkanShader* shader,
   }
 
   if (shader->is_valid()) {
-    XELOGGPU("Generated %s shader (%db) - hash %.16" PRIX64 ":\n%s\n",
+    XELOGGPU("Generated {} shader ({}b) - hash {:016X}:\n{}\n",
              shader->type() == ShaderType::kVertex ? "vertex" : "pixel",
              shader->ucode_dword_count() * 4, shader->ucode_data_hash(),
-             shader->ucode_disassembly().c_str());
+             shader->ucode_disassembly());
   }
 
   // Dump shader files if desired.
@@ -395,18 +395,18 @@ bool PipelineCache::TranslateShader(VulkanShader* shader,
 
 static void DumpShaderStatisticsAMD(const VkShaderStatisticsInfoAMD& stats) {
   XELOGI(" - resource usage:");
-  XELOGI("   numUsedVgprs: %d", stats.resourceUsage.numUsedVgprs);
-  XELOGI("   numUsedSgprs: %d", stats.resourceUsage.numUsedSgprs);
-  XELOGI("   ldsSizePerLocalWorkGroup: %d",
+  XELOGI("   numUsedVgprs: {}", stats.resourceUsage.numUsedVgprs);
+  XELOGI("   numUsedSgprs: {}", stats.resourceUsage.numUsedSgprs);
+  XELOGI("   ldsSizePerLocalWorkGroup: {}",
          stats.resourceUsage.ldsSizePerLocalWorkGroup);
-  XELOGI("   ldsUsageSizeInBytes     : %d",
+  XELOGI("   ldsUsageSizeInBytes     : {}",
          stats.resourceUsage.ldsUsageSizeInBytes);
-  XELOGI("   scratchMemUsageInBytes  : %d",
+  XELOGI("   scratchMemUsageInBytes  : {}",
          stats.resourceUsage.scratchMemUsageInBytes);
-  XELOGI("numPhysicalVgprs : %d", stats.numPhysicalVgprs);
-  XELOGI("numPhysicalSgprs : %d", stats.numPhysicalSgprs);
-  XELOGI("numAvailableVgprs: %d", stats.numAvailableVgprs);
-  XELOGI("numAvailableSgprs: %d", stats.numAvailableSgprs);
+  XELOGI("numPhysicalVgprs : {}", stats.numPhysicalVgprs);
+  XELOGI("numPhysicalSgprs : {}", stats.numPhysicalSgprs);
+  XELOGI("numAvailableVgprs: {}", stats.numAvailableVgprs);
+  XELOGI("numAvailableSgprs: {}", stats.numAvailableSgprs);
 }
 
 void PipelineCache::DumpShaderDisasmAMD(VkPipeline pipeline) {
@@ -521,8 +521,8 @@ void PipelineCache::DumpShaderDisasmNV(
       disasm_fp = std::string("Shader disassembly not available.");
     }
 
-    XELOGI("%s\n=====================================\n%s\n", disasm_vp.c_str(),
-           disasm_fp.c_str());
+    XELOGI("{}\n=====================================\n{}\n", disasm_vp,
+           disasm_fp);
   }
 
   vkDestroyPipeline(*device_, dummy_pipeline, nullptr);
@@ -1201,7 +1201,7 @@ PipelineCache::UpdateStatus PipelineCache::UpdateInputAssemblyState(
       break;
     default:
     case PrimitiveType::kTriangleWithWFlags:
-      XELOGE("unsupported primitive type %d", primitive_type);
+      XELOGE("unsupported primitive type {}", primitive_type);
       assert_unhandled_case(primitive_type);
       return UpdateStatus::kError;
   }
diff --git a/src/xenia/gpu/vulkan/render_cache.cc b/src/xenia/gpu/vulkan/render_cache.cc
index eabdddf8d..1c6b4a04a 100644
--- a/src/xenia/gpu/vulkan/render_cache.cc
+++ b/src/xenia/gpu/vulkan/render_cache.cc
@@ -864,7 +864,7 @@ bool RenderCache::ConfigureRenderPass(VkCommandBuffer command_buffer,
     render_pass = new CachedRenderPass(*device_, *config);
     VkResult status = render_pass->Initialize();
     if (status != VK_SUCCESS) {
-      XELOGE("%s: Failed to create render pass, status %s", __func__,
+      XELOGE("{}: Failed to create render pass, status {}", __func__,
              ui::vulkan::to_string(status));
       delete render_pass;
       return false;
@@ -943,7 +943,7 @@ bool RenderCache::ConfigureRenderPass(VkCommandBuffer command_buffer,
         target_color_attachments, target_depth_stencil_attachment);
     VkResult status = framebuffer->Initialize();
     if (status != VK_SUCCESS) {
-      XELOGE("%s: Failed to create framebuffer, status %s", __func__,
+      XELOGE("{}: Failed to create framebuffer, status {}", __func__,
              ui::vulkan::to_string(status));
       delete framebuffer;
       return false;
@@ -996,7 +996,7 @@ CachedTileView* RenderCache::FindOrCreateTileView(
   tile_view = new CachedTileView(device_, edram_memory_, view_key);
   VkResult status = tile_view->Initialize(command_buffer);
   if (status != VK_SUCCESS) {
-    XELOGE("%s: Failed to create tile view, status %s", __func__,
+    XELOGE("{}: Failed to create tile view, status {}", __func__,
            ui::vulkan::to_string(status));
 
     delete tile_view;
diff --git a/src/xenia/gpu/vulkan/texture_cache.cc b/src/xenia/gpu/vulkan/texture_cache.cc
index c6c4c18f2..00e456423 100644
--- a/src/xenia/gpu/vulkan/texture_cache.cc
+++ b/src/xenia/gpu/vulkan/texture_cache.cc
@@ -88,8 +88,8 @@ VkResult TextureCache::Initialize() {
       limits.maxPerStageDescriptorSampledImages < kMaxTextureSamplers) {
     XELOGE(
         "Physical device is unable to support required number of sampled "
-        "images! Expect instability! (maxPerStageDescriptorSamplers=%d, "
-        "maxPerStageDescriptorSampledImages=%d)",
+        "images! Expect instability! (maxPerStageDescriptorSamplers={}, "
+        "maxPerStageDescriptorSampledImages={})",
         limits.maxPerStageDescriptorSamplers,
         limits.maxPerStageDescriptorSampledImages);
     // assert_always();
@@ -190,7 +190,7 @@ TextureCache::Texture* TextureCache::AllocateTexture(
   VkFormat format = config.host_format;
   if (format == VK_FORMAT_UNDEFINED) {
     XELOGE(
-        "Texture Cache: Attempted to allocate texture format %s, which is "
+        "Texture Cache: Attempted to allocate texture format {}, which is "
         "defined as VK_FORMAT_UNDEFINED!",
         texture_info.format_info()->name);
     return nullptr;
@@ -235,13 +235,11 @@ TextureCache::Texture* TextureCache::AllocateTexture(
   if ((props.optimalTilingFeatures & required_flags) != required_flags) {
     // Texture needs conversion on upload to a native format.
     XELOGE(
-        "Texture Cache: Invalid usage flag specified on format %s (%s)\n\t"
-        "(requested: %s)",
+        "Texture Cache: Invalid usage flag specified on format {} ({})\n\t"
+        "(requested: {})",
         texture_info.format_info()->name, ui::vulkan::to_string(format),
-        ui::vulkan::to_flags_string(
-            static_cast<VkFormatFeatureFlagBits>(required_flags &
-                                                 ~props.optimalTilingFeatures))
-            .c_str());
+        ui::vulkan::to_flags_string(static_cast<VkFormatFeatureFlagBits>(
+            required_flags & ~props.optimalTilingFeatures)));
   }
 
   if (texture_info.dimension != Dimension::kCube &&
@@ -1070,9 +1068,9 @@ bool TextureCache::UploadTexture(VkCommandBuffer command_buffer,
   size_t unpack_length = ComputeTextureStorage(src);
 
   XELOGGPU(
-      "Uploading texture @ 0x%.8X/0x%.8X (%ux%ux%u, format: %s, dim: %s, "
-      "levels: %u (%u-%u), stacked: %s, pitch: %u, tiled: %s, packed mips: %s, "
-      "unpack length: 0x%.8X)",
+      "Uploading texture @ {:#08X}/{:#08X} ({}x{}x{}, format: {}, dim: {}, "
+      "levels: {} ({}-{}), stacked: {}, pitch: {}, tiled: {}, packed mips: {}, "
+      "unpack length: {:#X})",
       src.memory.base_address, src.memory.mip_address, src.width + 1,
       src.height + 1, src.depth + 1, src.format_info()->name,
       get_dimension_name(src.dimension), src.mip_levels(), src.mip_min_level,
@@ -1080,7 +1078,7 @@ bool TextureCache::UploadTexture(VkCommandBuffer command_buffer,
       src.is_tiled ? "yes" : "no", src.has_packed_mips ? "yes" : "no",
       unpack_length);
 
-  XELOGGPU("Extent: %ux%ux%u  %u,%u,%u", src.extent.pitch, src.extent.height,
+  XELOGGPU("Extent: {}x{}x{}  {},{},{}", src.extent.pitch, src.extent.height,
            src.extent.depth, src.extent.block_pitch_h, src.extent.block_height,
            src.extent.block_pitch_v);
 
@@ -1099,7 +1097,7 @@ bool TextureCache::UploadTexture(VkCommandBuffer command_buffer,
     if (!staging_buffer_.CanAcquire(unpack_length)) {
       // The staging buffer isn't big enough to hold this texture.
       XELOGE(
-          "TextureCache staging buffer is too small! (uploading 0x%.8X bytes)",
+          "TextureCache staging buffer is too small! (uploading {:#X} bytes)",
           unpack_length);
       assert_always();
       return false;
@@ -1110,7 +1108,7 @@ bool TextureCache::UploadTexture(VkCommandBuffer command_buffer,
   auto alloc = staging_buffer_.Acquire(unpack_length, completion_fence);
   assert_not_null(alloc);
   if (!alloc) {
-    XELOGE("%s: Failed to acquire staging memory!", __func__);
+    XELOGE("{}: Failed to acquire staging memory!", __func__);
     return false;
   }
 
@@ -1125,7 +1123,7 @@ bool TextureCache::UploadTexture(VkCommandBuffer command_buffer,
   }
 
   if (!valid) {
-    XELOGW("Warning: Texture @ 0x%.8X is blank!", src.memory.base_address);
+    XELOGW("Warning: Texture @ {:#08X} is blank!", src.memory.base_address);
   }
 
   // Upload texture into GPU memory.
@@ -1142,14 +1140,14 @@ bool TextureCache::UploadTexture(VkCommandBuffer command_buffer,
        mip++, region++) {
     if (!ConvertTexture(&unpack_buffer[unpack_offset], &copy_regions[region],
                         mip, src)) {
-      XELOGW("Failed to convert texture mip %u!", mip);
+      XELOGW("Failed to convert texture mip {}!", mip);
       return false;
     }
     copy_regions[region].bufferOffset = alloc->offset + unpack_offset;
     copy_regions[region].imageOffset = {0, 0, 0};
 
     /*
-    XELOGGPU("Mip %u %ux%ux%u @ 0x%X", mip,
+    XELOGGPU("Mip {} {}x{}x{} @ {:#X}", mip,
              copy_regions[region].imageExtent.width,
              copy_regions[region].imageExtent.height,
              copy_regions[region].imageExtent.depth, unpack_offset);
@@ -1510,7 +1508,8 @@ bool TextureCache::SetupTextureBinding(VkCommandBuffer command_buffer,
         break;
       }
       XELOGW(
-          "Texture fetch constant %u (%.8X %.8X %.8X %.8X %.8X %.8X) has "
+          "Texture fetch constant {} ({:08X} {:08X} {:08X} {:08X} {:08X} "
+          "{:08X}) has "
           "\"invalid\" type! This is incorrect behavior, but you can try "
           "bypassing this by launching Xenia with "
           "--gpu_allow_invalid_fetch_constants=true.",
@@ -1519,7 +1518,8 @@ bool TextureCache::SetupTextureBinding(VkCommandBuffer command_buffer,
       return false;
     default:
       XELOGW(
-          "Texture fetch constant %u (%.8X %.8X %.8X %.8X %.8X %.8X) is "
+          "Texture fetch constant {} ({:08X} {:08X} {:08X} {:08X} {:08X} "
+          "{:08X}) is "
           "completely invalid!",
           binding.fetch_constant, fetch.dword_0, fetch.dword_1, fetch.dword_2,
           fetch.dword_3, fetch.dword_4, fetch.dword_5);
diff --git a/src/xenia/gpu/vulkan/vulkan_command_processor.cc b/src/xenia/gpu/vulkan/vulkan_command_processor.cc
index 4f9ba2f3f..c7792667f 100644
--- a/src/xenia/gpu/vulkan/vulkan_command_processor.cc
+++ b/src/xenia/gpu/vulkan/vulkan_command_processor.cc
@@ -1121,9 +1121,9 @@ bool VulkanCommandProcessor::IssueCopy() {
                                         : static_cast<uint32_t>(depth_format);
   VkFilter filter = is_color_source ? VK_FILTER_LINEAR : VK_FILTER_NEAREST;
 
-  XELOGGPU("Resolve RT %.8X %.8X(%d) -> 0x%.8X (%dx%d, format: %s)", edram_base,
-           surface_pitch, surface_pitch, copy_dest_base, copy_dest_pitch,
-           copy_dest_height, texture_info.format_info()->name);
+  XELOGGPU("Resolve RT {:08X} {:08X}({}) -> {:#08X} ({}x{}, format: {})",
+           edram_base, surface_pitch, surface_pitch, copy_dest_base,
+           copy_dest_pitch, copy_dest_height, texture_info.format_info()->name);
   switch (copy_command) {
     case CopyCommand::kRaw:
       /*
diff --git a/src/xenia/hid/sdl/sdl_input_driver.cc b/src/xenia/hid/sdl/sdl_input_driver.cc
index 3c55d2c76..05643d662 100644
--- a/src/xenia/hid/sdl/sdl_input_driver.cc
+++ b/src/xenia/hid/sdl/sdl_input_driver.cc
@@ -121,22 +121,21 @@ X_STATUS SDLInputDriver::Setup() {
 
     if (!cvars::mappings_file.empty()) {
       if (!filesystem::PathExists(cvars::mappings_file)) {
-        XELOGW("SDL GameControllerDB: file '%s' does not exist.",
-               xe::path_to_utf8(cvars::mappings_file).c_str());
+        XELOGW("SDL GameControllerDB: file '{}' does not exist.",
+               xe::path_to_utf8(cvars::mappings_file));
       } else {
         auto mappings_file = filesystem::OpenFile(cvars::mappings_file, "rb");
         if (!mappings_file) {
-          XELOGE("SDL GameControllerDB: failed to open file '%s'.",
-                 xe::path_to_utf8(cvars::mappings_file).c_str());
+          XELOGE("SDL GameControllerDB: failed to open file '{}'.",
+                 xe::path_to_utf8(cvars::mappings_file));
         } else {
           auto mappings_result = SDL_GameControllerAddMappingsFromRW(
               SDL_RWFromFP(mappings_file, SDL_TRUE), 1);
           if (mappings_result < 0) {
-            XELOGE("SDL GameControllerDB: error loading file '%s': %d.",
-                   xe::path_to_utf8(cvars::mappings_file).c_str(),
-                   mappings_result);
+            XELOGE("SDL GameControllerDB: error loading file '{}': {}.",
+                   xe::path_to_utf8(cvars::mappings_file), mappings_result);
           } else {
-            XELOGI("SDL GameControllerDB: loaded %d mappings.",
+            XELOGI("SDL GameControllerDB: loaded {} mappings.",
                    mappings_result);
           }
         }
diff --git a/src/xenia/kernel/kernel_module.cc b/src/xenia/kernel/kernel_module.cc
index 8860fcc1a..44d7c8ee3 100644
--- a/src/xenia/kernel/kernel_module.cc
+++ b/src/xenia/kernel/kernel_module.cc
@@ -48,8 +48,8 @@ KernelModule::KernelModule(KernelState* kernel_state,
     module->SetAddressRange(guest_trampoline_, guest_trampoline_size_);
     emulator_->processor()->AddModule(std::move(module));
   } else {
-    XELOGW("KernelModule %s could not allocate trampoline for GetProcAddress!",
-           path.c_str());
+    XELOGW("KernelModule {} could not allocate trampoline for GetProcAddress!",
+           path);
   }
 
   OnLoad();
@@ -99,7 +99,7 @@ uint32_t KernelModule::GetProcAddressByOrdinal(uint16_t ordinal) {
       return export_entry->variable_ptr;
     } else {
       XELOGW(
-          "ERROR: var export referenced GetProcAddressByOrdinal(%.4X(%s)) is "
+          "ERROR: var export referenced GetProcAddressByOrdinal({:04X}({})) is "
           "not implemented",
           ordinal, export_entry->name);
       return 0;
@@ -127,7 +127,7 @@ uint32_t KernelModule::GetProcAddressByOrdinal(uint16_t ordinal) {
       uint32_t guest_addr =
           GenerateTrampoline(export_entry->name, handler, export_entry);
 
-      XELOGD("GetProcAddressByOrdinal(\"%s\", \"%s\") = %.8X", name().c_str(),
+      XELOGD("GetProcAddressByOrdinal(\"{}\", \"{}\") = {:08X}", name(),
              export_entry->name, guest_addr);
 
       // Register the function in our map.
@@ -136,7 +136,7 @@ uint32_t KernelModule::GetProcAddressByOrdinal(uint16_t ordinal) {
     } else {
       // Not implemented.
       XELOGW(
-          "ERROR: fn export referenced GetProcAddressByOrdinal(%.4X(%s)) is "
+          "ERROR: fn export referenced GetProcAddressByOrdinal({:04X}({})) is "
           "not implemented",
           ordinal, export_entry->name);
       return 0;
diff --git a/src/xenia/kernel/kernel_state.cc b/src/xenia/kernel/kernel_state.cc
index 0867aa068..570342646 100644
--- a/src/xenia/kernel/kernel_state.cc
+++ b/src/xenia/kernel/kernel_state.cc
@@ -249,7 +249,7 @@ object_ref<XThread> KernelState::LaunchModule(object_ref<UserModule> module) {
 
   X_STATUS result = thread->Create();
   if (XFAILED(result)) {
-    XELOGE("Could not create launch thread: %.8X", result);
+    XELOGE("Could not create launch thread: {:08X}", result);
     return nullptr;
   }
 
@@ -736,7 +736,7 @@ bool KernelState::Save(ByteStream* stream) {
   stream->Write(static_cast<uint32_t>(threads.size()));
 
   size_t num_threads = threads.size();
-  XELOGD("Serializing %d threads...", threads.size());
+  XELOGD("Serializing {} threads...", threads.size());
   for (auto thread : threads) {
     if (!thread->is_guest_thread()) {
       // Don't save host threads. They can be reconstructed on startup.
@@ -745,7 +745,7 @@ bool KernelState::Save(ByteStream* stream) {
     }
 
     if (!thread->Save(stream)) {
-      XELOGD("Failed to save thread \"%s\"", thread->name().c_str());
+      XELOGD("Failed to save thread \"{}\"", thread->name());
       num_threads--;
     }
   }
@@ -759,7 +759,7 @@ bool KernelState::Save(ByteStream* stream) {
   stream->Write(static_cast<uint32_t>(objects.size()));
 
   size_t num_objects = objects.size();
-  XELOGD("Serializing %d objects...", num_objects);
+  XELOGD("Serializing {} objects...", num_objects);
   for (auto object : objects) {
     auto prev_offset = stream->offset();
 
@@ -771,7 +771,7 @@ bool KernelState::Save(ByteStream* stream) {
 
     stream->Write<uint32_t>(object->type());
     if (!object->Save(stream)) {
-      XELOGD("Did not save object of type %d", object->type());
+      XELOGD("Did not save object of type {}", object->type());
       assert_always();
 
       // Revert backwards and overwrite if a save failed.
@@ -802,7 +802,7 @@ bool KernelState::Restore(ByteStream* stream) {
   }
 
   uint32_t num_threads = stream->Read<uint32_t>();
-  XELOGD("Loading %d threads...", num_threads);
+  XELOGD("Loading {} threads...", num_threads);
   for (uint32_t i = 0; i < num_threads; i++) {
     auto thread = XObject::Restore(this, XObject::kTypeThread, stream);
     if (!thread) {
@@ -813,7 +813,7 @@ bool KernelState::Restore(ByteStream* stream) {
   }
 
   uint32_t num_objects = stream->Read<uint32_t>();
-  XELOGD("Loading %d objects...", num_objects);
+  XELOGD("Loading {} objects...", num_objects);
   for (uint32_t i = 0; i < num_objects; i++) {
     uint32_t type = stream->Read<uint32_t>();
 
diff --git a/src/xenia/kernel/user_module.cc b/src/xenia/kernel/user_module.cc
index 518eaa42b..f3b8aef43 100644
--- a/src/xenia/kernel/user_module.cc
+++ b/src/xenia/kernel/user_module.cc
@@ -55,7 +55,7 @@ X_STATUS UserModule::LoadFromFile(const std::string_view path) {
   // TODO(benvanik): make this code shared?
   auto fs_entry = kernel_state()->file_system()->ResolvePath(path);
   if (!fs_entry) {
-    XELOGE("File not found: %s", path.c_str());
+    XELOGE("File not found: {}", path);
     return X_STATUS_NO_SUCH_FILE;
   }
 
@@ -109,17 +109,17 @@ X_STATUS UserModule::LoadFromFile(const std::string_view path) {
     if (patch_entry) {
       auto patch_path = patch_entry->absolute_path();
 
-      XELOGI("Loading XEX patch from %s", patch_path.c_str());
+      XELOGI("Loading XEX patch from {}", patch_path);
 
       auto patch_module = object_ref<UserModule>(new UserModule(kernel_state_));
       result = patch_module->LoadFromFile(patch_path);
       if (!result) {
         result = patch_module->xex_module()->ApplyPatch(xex_module());
         if (result) {
-          XELOGE("Failed to apply XEX patch, code: %d", result);
+          XELOGE("Failed to apply XEX patch, code: {}", result);
         }
       } else {
-        XELOGE("Failed to load XEX patch, code: %d", result);
+        XELOGE("Failed to load XEX patch, code: {}", result);
       }
 
       if (result) {
@@ -145,7 +145,7 @@ X_STATUS UserModule::LoadFromMemory(const void* addr, const size_t length) {
       XELOGE("XNA executables are not yet implemented");
       return X_STATUS_NOT_IMPLEMENTED;
     } else {
-      XELOGE("Unknown module magic: %.8X", magic);
+      XELOGE("Unknown module magic: {:08X}", magic);
       return X_STATUS_NOT_IMPLEMENTED;
     }
   }
@@ -376,8 +376,8 @@ object_ref<UserModule> UserModule::Restore(KernelState* kernel_state,
 
   auto result = module->LoadFromFile(path);
   if (XFAILED(result)) {
-    XELOGD("UserModule::Restore LoadFromFile(%s) FAILED - code %.8X",
-           path.c_str(), result);
+    XELOGD("UserModule::Restore LoadFromFile({}) FAILED - code {:08X}", path,
+           result);
     return nullptr;
   }
 
@@ -801,7 +801,7 @@ void UserModule::Dump() {
     sb.Append("\n");
   }
 
-  xe::LogLine(xe::LogLevel::Info, 'i', sb.to_string_view());
+  xe::logging::AppendLogLine(xe::LogLevel::Info, 'i', sb.to_string_view());
 }
 
 }  // namespace kernel
diff --git a/src/xenia/kernel/util/object_table.cc b/src/xenia/kernel/util/object_table.cc
index 08db10241..69967ff69 100644
--- a/src/xenia/kernel/util/object_table.cc
+++ b/src/xenia/kernel/util/object_table.cc
@@ -119,7 +119,7 @@ X_STATUS ObjectTable::AddHandle(XObject* object, X_HANDLE* out_handle) {
       // Retain so long as the object is in the table.
       object->Retain();
 
-      XELOGI("Added handle:%08X for %s", handle, typeid(*object).name());
+      XELOGI("Added handle:{:08X} for {}", handle, typeid(*object).name());
     }
   }
 
@@ -204,7 +204,7 @@ X_STATUS ObjectTable::RemoveHandle(X_HANDLE handle) {
       object->handles().erase(handle_entry);
     }
 
-    XELOGI("Removed handle:%08X for %s", handle, typeid(*object).name());
+    XELOGI("Removed handle:{:08X} for {}", handle, typeid(*object).name());
 
     // Release now that the object has been removed from the table.
     object->Release();
diff --git a/src/xenia/kernel/util/shim_utils.h b/src/xenia/kernel/util/shim_utils.h
index 3d9383f6d..fcfc90d4d 100644
--- a/src/xenia/kernel/util/shim_utils.h
+++ b/src/xenia/kernel/util/shim_utils.h
@@ -494,9 +494,11 @@ void PrintKernelCall(cpu::Export* export_entry, const Tuple& params) {
   AppendKernelCallParams(string_buffer, export_entry, params);
   string_buffer.Append(')');
   if (export_entry->tags & xe::cpu::ExportTag::kImportant) {
-    xe::LogLine(xe::LogLevel::Info, 'i', string_buffer.to_string_view());
+    xe::logging::AppendLogLine(xe::LogLevel::Info, 'i',
+                               string_buffer.to_string_view());
   } else {
-    xe::LogLine(xe::LogLevel::Debug, 'd', string_buffer.to_string_view());
+    xe::logging::AppendLogLine(xe::LogLevel::Debug, 'd',
+                               string_buffer.to_string_view());
   }
 }
 
diff --git a/src/xenia/kernel/xam/apps/unknown_fe_app.cc b/src/xenia/kernel/xam/apps/unknown_fe_app.cc
index cb05a339e..5361456ab 100644
--- a/src/xenia/kernel/xam/apps/unknown_fe_app.cc
+++ b/src/xenia/kernel/xam/apps/unknown_fe_app.cc
@@ -36,15 +36,15 @@ X_RESULT UnknownFEApp::DispatchMessageSync(uint32_t message,
       assert_true(buffer_length == sizeof(message_data));
       auto unk = memory_->TranslateVirtual<xe::be<uint32_t>*>(data->unk_44);
       *unk = 0;
-      XELOGD("UnknownFEApp(0x00020021)('%s', %.8X, %.8X, %.8X)", data->unk_00,
-             (uint32_t)data->unk_40, (uint32_t)data->unk_44,
+      XELOGD("UnknownFEApp(0x00020021)('{}', {:08X}, {:08X}, {:08X})",
+             data->unk_00, (uint32_t)data->unk_40, (uint32_t)data->unk_44,
              (uint32_t)data->unk_48);
       return X_ERROR_SUCCESS;
     }
   }
   XELOGE(
-      "Unimplemented 0xFE message app=%.8X, msg=%.8X, arg1=%.8X, "
-      "arg2=%.8X",
+      "Unimplemented 0xFE message app={:08X}, msg={:08X}, arg1={:08X}, "
+      "arg2={:08X}",
       app_id(), message, buffer_ptr, buffer_length);
   return X_STATUS_UNSUCCESSFUL;
 }
diff --git a/src/xenia/kernel/xam/apps/xgi_app.cc b/src/xenia/kernel/xam/apps/xgi_app.cc
index c232dacd0..b87a906c5 100644
--- a/src/xenia/kernel/xam/apps/xgi_app.cc
+++ b/src/xenia/kernel/xam/apps/xgi_app.cc
@@ -36,8 +36,8 @@ X_RESULT XgiApp::DispatchMessageSync(uint32_t message, uint32_t buffer_ptr,
       uint32_t user_index = xe::load_and_swap<uint32_t>(buffer + 0);
       uint32_t context_id = xe::load_and_swap<uint32_t>(buffer + 16);
       uint32_t context_value = xe::load_and_swap<uint32_t>(buffer + 20);
-      XELOGD("XGIUserSetContextEx(%.8X, %.8X, %.8X)", user_index, context_id,
-             context_value);
+      XELOGD("XGIUserSetContextEx({:08X}, {:08X}, {:08X})", user_index,
+             context_id, context_value);
       return X_ERROR_SUCCESS;
     }
     case 0x000B0007: {
@@ -45,7 +45,7 @@ X_RESULT XgiApp::DispatchMessageSync(uint32_t message, uint32_t buffer_ptr,
       uint32_t property_id = xe::load_and_swap<uint32_t>(buffer + 16);
       uint32_t value_size = xe::load_and_swap<uint32_t>(buffer + 20);
       uint32_t value_ptr = xe::load_and_swap<uint32_t>(buffer + 24);
-      XELOGD("XGIUserSetPropertyEx(%.8X, %.8X, %d, %.8X)", user_index,
+      XELOGD("XGIUserSetPropertyEx({:08X}, {:08X}, {}, {:08X})", user_index,
              property_id, value_size, value_ptr);
       return X_ERROR_SUCCESS;
     }
@@ -53,7 +53,7 @@ X_RESULT XgiApp::DispatchMessageSync(uint32_t message, uint32_t buffer_ptr,
       assert_true(!buffer_length || buffer_length == 8);
       uint32_t achievement_count = xe::load_and_swap<uint32_t>(buffer + 0);
       uint32_t achievements_ptr = xe::load_and_swap<uint32_t>(buffer + 4);
-      XELOGD("XGIUserWriteAchievements(%.8X, %.8X)", achievement_count,
+      XELOGD("XGIUserWriteAchievements({:08X}, {:08X})", achievement_count,
              achievements_ptr);
       return X_ERROR_SUCCESS;
     }
@@ -72,9 +72,11 @@ X_RESULT XgiApp::DispatchMessageSync(uint32_t message, uint32_t buffer_ptr,
       uint32_t session_info_ptr = xe::load_and_swap<uint32_t>(buffer + 0x14);
       uint32_t nonce_ptr = xe::load_and_swap<uint32_t>(buffer + 0x18);
 
-      XELOGD("XGISessionCreateImpl(%.8X, %.8X, %d, %d, %.8X, %.8X, %.8X)",
-             session_ptr, flags, num_slots_public, num_slots_private, user_xuid,
-             session_info_ptr, nonce_ptr);
+      XELOGD(
+          "XGISessionCreateImpl({:08X}, {:08X}, {}, {}, {:08X}, {:08X}, "
+          "{:08X})",
+          session_ptr, flags, num_slots_public, num_slots_private, user_xuid,
+          session_info_ptr, nonce_ptr);
       return X_STATUS_SUCCESS;
     }
     case 0x000B0011: {
@@ -89,7 +91,7 @@ X_RESULT XgiApp::DispatchMessageSync(uint32_t message, uint32_t buffer_ptr,
       uint32_t private_slots_array = xe::load_and_swap<uint32_t>(buffer + 0x10);
 
       assert_zero(unk_0);
-      XELOGD("XGISessionJoinLocal(%.8X, %d, %d, %.8X, %.8X)", session_ptr,
+      XELOGD("XGISessionJoinLocal({:08X}, {}, {}, {:08X}, {:08X})", session_ptr,
              user_count, unk_0, user_index_array, private_slots_array);
       return X_STATUS_SUCCESS;
     }
@@ -102,8 +104,8 @@ X_RESULT XgiApp::DispatchMessageSync(uint32_t message, uint32_t buffer_ptr,
           context_ptr ? memory_->TranslateVirtual(context_ptr) : nullptr;
       uint32_t context_id =
           context ? xe::load_and_swap<uint32_t>(context + 0) : 0;
-      XELOGD("XGIUserGetContext(%.8X, %.8X(%.8X))", user_index, context_ptr,
-             context_id);
+      XELOGD("XGIUserGetContext({:08X}, {:08X}{:08X}))", user_index,
+             context_ptr, context_id);
       uint32_t value = 0;
       if (context) {
         xe::store_and_swap<uint32_t>(context + 4, value);
@@ -115,8 +117,10 @@ X_RESULT XgiApp::DispatchMessageSync(uint32_t message, uint32_t buffer_ptr,
       return X_ERROR_SUCCESS;
     }
   }
-  XELOGE("Unimplemented XGI message app=%.8X, msg=%.8X, arg1=%.8X, arg2=%.8X",
-         app_id(), message, buffer_ptr, buffer_length);
+  XELOGE(
+      "Unimplemented XGI message app={:08X}, msg={:08X}, arg1={:08X}, "
+      "arg2={:08X}",
+      app_id(), message, buffer_ptr, buffer_length);
   return X_STATUS_UNSUCCESSFUL;
 }
 
diff --git a/src/xenia/kernel/xam/apps/xlivebase_app.cc b/src/xenia/kernel/xam/apps/xlivebase_app.cc
index 76149d906..e20261b51 100644
--- a/src/xenia/kernel/xam/apps/xlivebase_app.cc
+++ b/src/xenia/kernel/xam/apps/xlivebase_app.cc
@@ -31,13 +31,13 @@ X_RESULT XLiveBaseApp::DispatchMessageSync(uint32_t message,
     case 0x00058004: {
       // Called on startup, seems to just return a bool in the buffer.
       assert_true(!buffer_length || buffer_length == 4);
-      XELOGD("XLiveBaseGetLogonId(%.8X)", buffer_ptr);
+      XELOGD("XLiveBaseGetLogonId({:08X})", buffer_ptr);
       xe::store_and_swap<uint32_t>(buffer + 0, 1);  // ?
       return X_ERROR_SUCCESS;
     }
     case 0x00058006: {
       assert_true(!buffer_length || buffer_length == 4);
-      XELOGD("XLiveBaseGetNatType(%.8X)", buffer_ptr);
+      XELOGD("XLiveBaseGetNatType({:08X})", buffer_ptr);
       xe::store_and_swap<uint32_t>(buffer + 0, 1);  // XONLINE_NAT_OPEN
       return X_ERROR_SUCCESS;
     }
@@ -46,12 +46,12 @@ X_RESULT XLiveBaseApp::DispatchMessageSync(uint32_t message,
       // We should create a XamEnumerate-able empty list here, but I'm not
       // sure of the format.
       // buffer_length seems to be the same ptr sent to 0x00058004.
-      XELOGD("XLiveBaseFriendsCreateEnumerator(%.8X, %.8X) unimplemented",
+      XELOGD("XLiveBaseFriendsCreateEnumerator({:08X}, {:08X}) unimplemented",
              buffer_ptr, buffer_length);
       return X_STATUS_UNSUCCESSFUL;
     }
     case 0x00058023: {
-      XELOGD("XliveBaseUnk58023(%.8X, %.8X) unimplemented", buffer_ptr,
+      XELOGD("XliveBaseUnk58023({:08X}, {:08X}) unimplemented", buffer_ptr,
              buffer_length);
       return X_STATUS_UNSUCCESSFUL;
     }
@@ -59,14 +59,14 @@ X_RESULT XLiveBaseApp::DispatchMessageSync(uint32_t message,
       // Required to be successful for Forza 4 to detect signed-in profile
       // Doesn't seem to set anything in the given buffer, probably only takes
       // input
-      XELOGD("XLiveBaseUnk58046(%.8X, %.8X) unimplemented", buffer_ptr,
+      XELOGD("XLiveBaseUnk58046({:08X}, {:08X}) unimplemented", buffer_ptr,
              buffer_length);
       return X_ERROR_SUCCESS;
     }
   }
   XELOGE(
-      "Unimplemented XLIVEBASE message app=%.8X, msg=%.8X, arg1=%.8X, "
-      "arg2=%.8X",
+      "Unimplemented XLIVEBASE message app={:08X}, msg={:08X}, arg1={:08X}, "
+      "arg2={:08X}",
       app_id(), message, buffer_ptr, buffer_length);
   return X_STATUS_UNSUCCESSFUL;
 }
diff --git a/src/xenia/kernel/xam/apps/xmp_app.cc b/src/xenia/kernel/xam/apps/xmp_app.cc
index b715623f2..217fbf908 100644
--- a/src/xenia/kernel/xam/apps/xmp_app.cc
+++ b/src/xenia/kernel/xam/apps/xmp_app.cc
@@ -35,7 +35,7 @@ X_RESULT XmpApp::XMPGetStatus(uint32_t state_ptr) {
   // here to keep from starving real threads.
   xe::threading::Sleep(std::chrono::milliseconds(1));
 
-  XELOGD("XMPGetStatus(%.8X)", state_ptr);
+  XELOGD("XMPGetStatus({:08X})", state_ptr);
   xe::store_and_swap<uint32_t>(memory_->TranslateVirtual(state_ptr),
                                static_cast<uint32_t>(state_));
   return X_ERROR_SUCCESS;
@@ -47,10 +47,11 @@ X_RESULT XmpApp::XMPCreateTitlePlaylist(uint32_t songs_ptr, uint32_t song_count,
                                         uint32_t flags,
                                         uint32_t out_song_handles,
                                         uint32_t out_playlist_handle) {
-  XELOGD("XMPCreateTitlePlaylist(%.8X, %.8X, %.8X(%s), %.8X, %.8X, %.8X)",
-         songs_ptr, song_count, playlist_name_ptr,
-         xe::to_utf8(playlist_name).c_str(), flags, out_song_handles,
-         out_playlist_handle);
+  XELOGD(
+      "XMPCreateTitlePlaylist({:08X}, {:08X}, {:08X}({}), {:08X}, {:08X}, "
+      "{:08X})",
+      songs_ptr, song_count, playlist_name_ptr, xe::to_utf8(playlist_name),
+      flags, out_song_handles, out_playlist_handle);
   auto playlist = std::make_unique<Playlist>();
   playlist->handle = ++next_playlist_handle_;
   playlist->name = playlist_name;
@@ -99,7 +100,7 @@ X_RESULT XmpApp::XMPCreateTitlePlaylist(uint32_t songs_ptr, uint32_t song_count,
 }
 
 X_RESULT XmpApp::XMPDeleteTitlePlaylist(uint32_t playlist_handle) {
-  XELOGD("XMPDeleteTitlePlaylist(%.8X)", playlist_handle);
+  XELOGD("XMPDeleteTitlePlaylist({:08X})", playlist_handle);
   auto global_lock = global_critical_region_.Acquire();
   auto it = playlists_.find(playlist_handle);
   if (it == playlists_.end()) {
@@ -117,13 +118,13 @@ X_RESULT XmpApp::XMPDeleteTitlePlaylist(uint32_t playlist_handle) {
 
 X_RESULT XmpApp::XMPPlayTitlePlaylist(uint32_t playlist_handle,
                                       uint32_t song_handle) {
-  XELOGD("XMPPlayTitlePlaylist(%.8X, %.8X)", playlist_handle, song_handle);
+  XELOGD("XMPPlayTitlePlaylist({:08X}, {:08X})", playlist_handle, song_handle);
   Playlist* playlist = nullptr;
   {
     auto global_lock = global_critical_region_.Acquire();
     auto it = playlists_.find(playlist_handle);
     if (it == playlists_.end()) {
-      XELOGE("Playlist %.8X not found", playlist_handle);
+      XELOGE("Playlist {:08X} not found", playlist_handle);
       return X_ERROR_NOT_FOUND;
     }
     playlist = it->second;
@@ -156,7 +157,7 @@ X_RESULT XmpApp::XMPContinue() {
 
 X_RESULT XmpApp::XMPStop(uint32_t unk) {
   assert_zero(unk);
-  XELOGD("XMPStop(%.8X)", unk);
+  XELOGD("XMPStop({:08X})", unk);
   active_playlist_ = nullptr;  // ?
   active_song_index_ = 0;
   state_ = State::kIdle;
@@ -258,7 +259,7 @@ X_RESULT XmpApp::DispatchMessageSync(uint32_t message, uint32_t buffer_ptr,
       uint32_t repeat_mode = xe::load_and_swap<uint32_t>(buffer + 8);
       uint32_t flags = xe::load_and_swap<uint32_t>(buffer + 12);
       assert_true(xmp_client == 0x00000002);
-      XELOGD("XMPSetPlaybackBehavior(%.8X, %.8X, %.8X)", playback_mode,
+      XELOGD("XMPSetPlaybackBehavior({:08X}, {:08X}, {:08X})", playback_mode,
              repeat_mode, flags);
       playback_mode_ = static_cast<PlaybackMode>(playback_mode);
       repeat_mode_ = static_cast<RepeatMode>(repeat_mode);
@@ -282,7 +283,7 @@ X_RESULT XmpApp::DispatchMessageSync(uint32_t message, uint32_t buffer_ptr,
       }* args = memory_->TranslateVirtual<decltype(args)>(buffer_ptr);
 
       assert_true(args->xmp_client == 0x00000002);
-      XELOGD("XMPGetVolume(%.8X)", uint32_t(args->volume_ptr));
+      XELOGD("XMPGetVolume({:08X})", uint32_t(args->volume_ptr));
       xe::store_and_swap<float>(memory_->TranslateVirtual(args->volume_ptr),
                                 volume_);
       return X_ERROR_SUCCESS;
@@ -292,7 +293,7 @@ X_RESULT XmpApp::DispatchMessageSync(uint32_t message, uint32_t buffer_ptr,
       uint32_t xmp_client = xe::load_and_swap<uint32_t>(buffer + 0);
       float float_value = xe::load_and_swap<float>(buffer + 4);
       assert_true(xmp_client == 0x00000002);
-      XELOGD("XMPSetVolume(%g)", float_value);
+      XELOGD("XMPSetVolume({})", float_value);
       volume_ = float_value;
       return X_ERROR_SUCCESS;
     }
@@ -332,7 +333,7 @@ X_RESULT XmpApp::DispatchMessageSync(uint32_t message, uint32_t buffer_ptr,
       auto info = memory_->TranslateVirtual(info_ptr);
       assert_true(xmp_client == 0x00000002);
       assert_zero(unk_ptr);
-      XELOGE("XMPGetInfo?(%.8X, %.8X)", unk_ptr, info_ptr);
+      XELOGE("XMPGetInfo?({:08X}, {:08X})", unk_ptr, info_ptr);
       if (!active_playlist_) {
         return X_STATUS_UNSUCCESSFUL;
       }
@@ -370,8 +371,8 @@ X_RESULT XmpApp::DispatchMessageSync(uint32_t message, uint32_t buffer_ptr,
 
       assert_true(args->xmp_client == 0x00000002);
       assert_true(args->controller == 0x00000000);
-      XELOGD("XMPSetPlaybackController(%.8X, %.8X)", uint32_t(args->controller),
-             uint32_t(args->locked));
+      XELOGD("XMPSetPlaybackController({:08X}, {:08X})",
+             uint32_t(args->controller), uint32_t(args->locked));
 
       disabled_ = args->locked;
       if (disabled_) {
@@ -390,7 +391,7 @@ X_RESULT XmpApp::DispatchMessageSync(uint32_t message, uint32_t buffer_ptr,
       }* args = memory_->TranslateVirtual<decltype(args)>(buffer_ptr);
 
       assert_true(args->xmp_client == 0x00000002);
-      XELOGD("XMPGetPlaybackController(%.8X, %.8X, %.8X)",
+      XELOGD("XMPGetPlaybackController({:08X}, {:08X}, {:08X})",
              uint32_t(args->xmp_client), uint32_t(args->controller_ptr),
              uint32_t(args->locked_ptr));
       xe::store_and_swap<uint32_t>(
@@ -410,8 +411,8 @@ X_RESULT XmpApp::DispatchMessageSync(uint32_t message, uint32_t buffer_ptr,
       uint32_t repeat_mode_ptr = xe::load_and_swap<uint32_t>(buffer + 8);
       uint32_t unk3_ptr = xe::load_and_swap<uint32_t>(buffer + 12);
       assert_true(xmp_client == 0x00000002);
-      XELOGD("XMPGetPlaybackBehavior(%.8X, %.8X, %.8X)", playback_mode_ptr,
-             repeat_mode_ptr, unk3_ptr);
+      XELOGD("XMPGetPlaybackBehavior({:08X}, {:08X}, {:08X})",
+             playback_mode_ptr, repeat_mode_ptr, unk3_ptr);
       if (playback_mode_ptr) {
         xe::store_and_swap<uint32_t>(
             memory_->TranslateVirtual(playback_mode_ptr),
@@ -447,8 +448,10 @@ X_RESULT XmpApp::DispatchMessageSync(uint32_t message, uint32_t buffer_ptr,
       return X_STATUS_UNSUCCESSFUL;
     }
   }
-  XELOGE("Unimplemented XMP message app=%.8X, msg=%.8X, arg1=%.8X, arg2=%.8X",
-         app_id(), message, buffer_ptr, buffer_length);
+  XELOGE(
+      "Unimplemented XMP message app={:08X}, msg={:08X}, arg1={:08X}, "
+      "arg2={:08X}",
+      app_id(), message, buffer_ptr, buffer_length);
   return X_STATUS_UNSUCCESSFUL;
 }
 
diff --git a/src/xenia/kernel/xam/xam_content.cc b/src/xenia/kernel/xam/xam_content.cc
index 98e74fcad..67f510038 100644
--- a/src/xenia/kernel/xam/xam_content.cc
+++ b/src/xenia/kernel/xam/xam_content.cc
@@ -189,7 +189,7 @@ dword_result_t XamContentCreateEnumerator(dword_t user_index, dword_t device_id,
     content_data.Write(ptr);
   }
 
-  XELOGD("XamContentCreateEnumerator: added %d items to enumerator",
+  XELOGD("XamContentCreateEnumerator: added {} items to enumerator",
          e->item_count());
 
   *handle_out = e->handle();
diff --git a/src/xenia/kernel/xam/xam_info.cc b/src/xenia/kernel/xam/xam_info.cc
index 189d3ca1f..0589e83a1 100644
--- a/src/xenia/kernel/xam/xam_info.cc
+++ b/src/xenia/kernel/xam/xam_info.cc
@@ -114,8 +114,9 @@ dword_result_t keXamBuildResourceLocator(uint64_t module,
   std::u16string path;
   if (!module) {
     path = fmt::format(u"file://media:/{0}.xzp#{0}", container, resource);
-    XELOGD("XamBuildResourceLocator(%s) returning locator to local file %s.xzp",
-           xe::to_utf8(container).c_str(), xe::to_utf8(container).c_str());
+    XELOGD(
+        "XamBuildResourceLocator({0}) returning locator to local file {0}.xzp",
+        xe::to_utf8(container));
   } else {
     path = fmt::format(u"section://{:X},{}#{}", (uint32_t)module, container,
                        resource);
@@ -358,8 +359,9 @@ dword_result_t XamEnumerate(dword_t handle, dword_t flags, lpvoid_t buffer,
     // Known culprits:
     //   Final Fight: Double Impact (saves)
     XELOGW(
-        "Broken usage of XamEnumerate! buffer length=%.X vs actual length=%.X "
-        "(item size=%.X, items per enumerate=%u)",
+        "Broken usage of XamEnumerate! buffer length={:X} vs actual "
+        "length={:X} "
+        "(item size={:X}, items per enumerate={})",
         (uint32_t)buffer_length, actual_buffer_length, e->item_size(),
         e->items_per_enumerate());
   }
@@ -430,4 +432,4 @@ void RegisterInfoExports(xe::cpu::ExportResolver* export_resolver,
 
 }  // namespace xam
 }  // namespace kernel
-}  // namespace xe
\ No newline at end of file
+}  // namespace xe
diff --git a/src/xenia/kernel/xam/xam_msg.cc b/src/xenia/kernel/xam/xam_msg.cc
index 07d0be6c7..5bcefa25d 100644
--- a/src/xenia/kernel/xam/xam_msg.cc
+++ b/src/xenia/kernel/xam/xam_msg.cc
@@ -23,7 +23,7 @@ dword_result_t XMsgInProcessCall(dword_t app, dword_t message, dword_t arg1,
   auto result = kernel_state()->app_manager()->DispatchMessageSync(app, message,
                                                                    arg1, arg2);
   if (result == X_ERROR_NOT_FOUND) {
-    XELOGE("XMsgInProcessCall: app %.8X undefined", (uint32_t)app);
+    XELOGE("XMsgInProcessCall: app {:08X} undefined", app);
   }
   return result;
 }
@@ -34,7 +34,7 @@ dword_result_t XMsgSystemProcessCall(dword_t app, dword_t message,
   auto result = kernel_state()->app_manager()->DispatchMessageAsync(
       app, message, buffer, buffer_length);
   if (result == X_ERROR_NOT_FOUND) {
-    XELOGE("XMsgSystemProcessCall: app %.8X undefined", (uint32_t)app);
+    XELOGE("XMsgSystemProcessCall: app {:08X} undefined", app);
   }
   return result;
 }
@@ -46,7 +46,7 @@ dword_result_t XMsgStartIORequest(dword_t app, dword_t message,
   auto result = kernel_state()->app_manager()->DispatchMessageAsync(
       app, message, buffer, buffer_length);
   if (result == X_ERROR_NOT_FOUND) {
-    XELOGE("XMsgStartIORequest: app %.8X undefined", (uint32_t)app);
+    XELOGE("XMsgStartIORequest: app {:08X} undefined", app);
   }
   if (overlapped_ptr) {
     kernel_state()->CompleteOverlappedImmediate(overlapped_ptr, result);
@@ -63,7 +63,7 @@ dword_result_t XMsgStartIORequestEx(dword_t app, dword_t message,
   auto result = kernel_state()->app_manager()->DispatchMessageAsync(
       app, message, buffer, buffer_length);
   if (result == X_ERROR_NOT_FOUND) {
-    XELOGE("XMsgStartIORequestEx: app %.8X undefined", (uint32_t)app);
+    XELOGE("XMsgStartIORequestEx: app {:08X} undefined", app);
   }
   if (overlapped_ptr) {
     kernel_state()->CompleteOverlappedImmediate(overlapped_ptr, result);
diff --git a/src/xenia/kernel/xam/xam_net.cc b/src/xenia/kernel/xam/xam_net.cc
index 3150b3098..6d8ae8704 100644
--- a/src/xenia/kernel/xam/xam_net.cc
+++ b/src/xenia/kernel/xam/xam_net.cc
@@ -196,7 +196,7 @@ dword_result_t NetDll_XNetGetOpt(dword_t one, dword_t option_id,
       std::memcpy(buffer_ptr, &xnet_startup_params, sizeof(XNetStartupParams));
       return 0;
     default:
-      XELOGE("NetDll_XNetGetOpt: option %d unimplemented", option_id);
+      XELOGE("NetDll_XNetGetOpt: option {} unimplemented", option_id);
       return 0x2726;  // WSAEINVAL
   }
 }
@@ -537,7 +537,7 @@ SHIM_CALL NetDll_XNetQosServiceLookup_shim(PPCContext* ppc_context,
   uint32_t event_handle = SHIM_GET_ARG_32(2);
   uint32_t out_ptr = SHIM_GET_ARG_32(3);
 
-  XELOGD("NetDll_XNetQosServiceLookup(%d, %d, %.8X, %.8X)", caller, zero,
+  XELOGD("NetDll_XNetQosServiceLookup({}, {}, {:08X}, {:08X})", caller, zero,
          event_handle, out_ptr);
 
   // Non-zero is error.
diff --git a/src/xenia/kernel/xam/xam_user.cc b/src/xenia/kernel/xam/xam_user.cc
index 738188891..6a69d9280 100644
--- a/src/xenia/kernel/xam/xam_user.cc
+++ b/src/xenia/kernel/xam/xam_user.cc
@@ -172,8 +172,9 @@ dword_result_t XamUserReadProfileSettings(
       }
     } else {
       any_missing = true;
-      XELOGE("XamUserReadProfileSettings requested unimplemented setting %.8X",
-             setting_id);
+      XELOGE(
+          "XamUserReadProfileSettings requested unimplemented setting {:08X}",
+          setting_id);
     }
   }
 
@@ -288,8 +289,8 @@ dword_result_t XamUserWriteProfileSettings(
   for (uint32_t n = 0; n < setting_count; ++n) {
     const X_USER_WRITE_PROFILE_SETTING& settings_data = settings[n];
     XELOGD(
-        "XamUserWriteProfileSettings: setting index [%d]:"
-        " from=%d setting_id=%.8X data.type=%d",
+        "XamUserWriteProfileSettings: setting index [{}]:"
+        " from={} setting_id={:08X} data.type={}",
         n, (uint32_t)settings_data.from, (uint32_t)settings_data.setting_id,
         settings_data.type);
 
@@ -327,7 +328,7 @@ dword_result_t XamUserWriteProfileSettings(
       case UserProfile::Setting::Type::DATETIME:
       default:
 
-        XELOGE("XamUserWriteProfileSettings: Unimplemented data type %d",
+        XELOGE("XamUserWriteProfileSettings: Unimplemented data type {}",
                settingType);
         break;
     };
diff --git a/src/xenia/kernel/xboxkrnl/cert_monitor.cc b/src/xenia/kernel/xboxkrnl/cert_monitor.cc
index 4ce3aeb08..6085de5af 100644
--- a/src/xenia/kernel/xboxkrnl/cert_monitor.cc
+++ b/src/xenia/kernel/xboxkrnl/cert_monitor.cc
@@ -31,7 +31,7 @@ void KeCertMonitorCallback(cpu::ppc::PPCContext* ppc_context,
                            kernel::KernelState* kernel_state) {
   auto id = ppc_context->r[3];
   auto arg = ppc_context->r[4];
-  XELOGI("KeCertMonitorCallback(%u, %08x)", id, arg);
+  XELOGI("KeCertMonitorCallback({}, {:08X})", id, arg);
   auto xboxkrnl = kernel_state->GetKernelModule<XboxkrnlModule>("xboxkrnl.exe");
 }
 
diff --git a/src/xenia/kernel/xboxkrnl/debug_monitor.cc b/src/xenia/kernel/xboxkrnl/debug_monitor.cc
index 95138d08a..2e1bf75ac 100644
--- a/src/xenia/kernel/xboxkrnl/debug_monitor.cc
+++ b/src/xenia/kernel/xboxkrnl/debug_monitor.cc
@@ -43,7 +43,7 @@ void KeDebugMonitorCallback(cpu::ppc::PPCContext* ppc_context,
   auto id = static_cast<DebugMonitorCommand>(ppc_context->r[3] & 0xFFFFFFFFu);
   auto arg = static_cast<uint32_t>(ppc_context->r[4] & 0xFFFFFFFFu);
 
-  XELOGI("KeDebugMonitorCallback(%u, %08x)", static_cast<uint32_t>(id), arg);
+  XELOGI("KeDebugMonitorCallback({}, {:08X})", static_cast<uint32_t>(id), arg);
 
   if (!cvars::kernel_pix) {
     SHIM_SET_RETURN_32(-1);
@@ -55,8 +55,8 @@ void KeDebugMonitorCallback(cpu::ppc::PPCContext* ppc_context,
   switch (id) {
     case DebugMonitorCommand::PIXCommandResult: {
       auto s = kernel_state->memory()->TranslateVirtual<const char*>(arg);
-      debugging::DebugPrint("%s\n", s);
-      XELOGD("PIX command result: %s\n", s);
+      debugging::DebugPrint("{}\n", s);
+      XELOGD("PIX command result: {}\n", s);
       if (strcmp(s, "PIX!{CaptureFileCreationEnded} 0x00000000") == 0) {
         xboxkrnl->SendPIXCommand("{BeginCapture}");
       }
diff --git a/src/xenia/kernel/xboxkrnl/xboxkrnl_audio_xma.cc b/src/xenia/kernel/xboxkrnl/xboxkrnl_audio_xma.cc
index 00493cc06..951732494 100644
--- a/src/xenia/kernel/xboxkrnl/xboxkrnl_audio_xma.cc
+++ b/src/xenia/kernel/xboxkrnl/xboxkrnl_audio_xma.cc
@@ -130,7 +130,7 @@ dword_result_t XMAInitializeContext(lpvoid_t context_ptr,
     assert_true(input_buffer_0_physical_address != UINT32_MAX);
     if (input_buffer_0_physical_address == UINT32_MAX) {
       XELOGE(
-          "XMAInitializeContext: Invalid input buffer 0 virtual address %.8X",
+          "XMAInitializeContext: Invalid input buffer 0 virtual address {:08X}",
           input_buffer_0_guest_ptr);
       return X_E_FALSE;
     }
@@ -143,7 +143,7 @@ dword_result_t XMAInitializeContext(lpvoid_t context_ptr,
     assert_true(input_buffer_1_physical_address != UINT32_MAX);
     if (input_buffer_1_physical_address == UINT32_MAX) {
       XELOGE(
-          "XMAInitializeContext: Invalid input buffer 1 virtual address %.8X",
+          "XMAInitializeContext: Invalid input buffer 1 virtual address {:08X}",
           input_buffer_1_guest_ptr);
       return X_E_FALSE;
     }
@@ -154,7 +154,7 @@ dword_result_t XMAInitializeContext(lpvoid_t context_ptr,
       kernel_memory()->GetPhysicalAddress(output_buffer_guest_ptr);
   assert_true(output_buffer_physical_address != UINT32_MAX);
   if (output_buffer_physical_address == UINT32_MAX) {
-    XELOGE("XMAInitializeContext: Invalid output buffer virtual address %.8X",
+    XELOGE("XMAInitializeContext: Invalid output buffer virtual address {:08X}",
            output_buffer_guest_ptr);
     return X_E_FALSE;
   }
@@ -234,7 +234,7 @@ dword_result_t XMASetInputBuffer0(lpvoid_t context_ptr, lpvoid_t buffer,
   assert_true(buffer_physical_address != UINT32_MAX);
   if (buffer_physical_address == UINT32_MAX) {
     // Xenia-specific safety check.
-    XELOGE("XMASetInputBuffer0: Invalid buffer virtual address %.8X",
+    XELOGE("XMASetInputBuffer0: Invalid buffer virtual address {:08X}",
            buffer.guest_address());
     return X_E_FALSE;
   }
@@ -275,7 +275,7 @@ dword_result_t XMASetInputBuffer1(lpvoid_t context_ptr, lpvoid_t buffer,
   assert_true(buffer_physical_address != UINT32_MAX);
   if (buffer_physical_address == UINT32_MAX) {
     // Xenia-specific safety check.
-    XELOGE("XMASetInputBuffer1: Invalid buffer virtual address %.8X",
+    XELOGE("XMASetInputBuffer1: Invalid buffer virtual address {:08X}",
            buffer.guest_address());
     return X_E_FALSE;
   }
diff --git a/src/xenia/kernel/xboxkrnl/xboxkrnl_debug.cc b/src/xenia/kernel/xboxkrnl/xboxkrnl_debug.cc
index 994c55f57..e7483b66b 100644
--- a/src/xenia/kernel/xboxkrnl/xboxkrnl_debug.cc
+++ b/src/xenia/kernel/xboxkrnl/xboxkrnl_debug.cc
@@ -60,7 +60,7 @@ void HandleSetThreadName(pointer_t<X_EXCEPTION_RECORD> record) {
   }
 
   if (thread) {
-    XELOGD("SetThreadName(%d, %s)", thread->thread_id(), name);
+    XELOGD("SetThreadName({}, {})", thread->thread_id(), name);
     thread->set_name(name);
   }
 
@@ -136,7 +136,7 @@ DECLARE_XBOXKRNL_EXPORT2(RtlRaiseException, kDebug, kStub, kImportant);
 
 void KeBugCheckEx(dword_t code, dword_t param1, dword_t param2, dword_t param3,
                   dword_t param4) {
-  XELOGD("*** STOP: 0x%.8X (0x%.8X, 0x%.8X, 0x%.8X, 0x%.8X)", code, param1,
+  XELOGD("*** STOP: {:#08X} ({:#08X}, {:#08X}, {:#08X}, {:#08X})", code, param1,
          param2, param3, param4);
   fflush(stdout);
   xe::debugging::Break();
diff --git a/src/xenia/kernel/xboxkrnl/xboxkrnl_error.cc b/src/xenia/kernel/xboxkrnl/xboxkrnl_error.cc
index 114111624..cd41c0858 100644
--- a/src/xenia/kernel/xboxkrnl/xboxkrnl_error.cc
+++ b/src/xenia/kernel/xboxkrnl/xboxkrnl_error.cc
@@ -997,7 +997,7 @@ uint32_t xeRtlNtStatusToDosError(uint32_t source_status) {
       if (!result) {
         break;
       }
-      XELOGI("RtlNtStatusToDosError %X => %X", status, result);
+      XELOGI("RtlNtStatusToDosError {:X} => {:X}", status, result);
       return result;
     }
     ++error_table;
diff --git a/src/xenia/kernel/xboxkrnl/xboxkrnl_io.cc b/src/xenia/kernel/xboxkrnl/xboxkrnl_io.cc
index 5dbcf3c82..367d980e0 100644
--- a/src/xenia/kernel/xboxkrnl/xboxkrnl_io.cc
+++ b/src/xenia/kernel/xboxkrnl/xboxkrnl_io.cc
@@ -375,7 +375,7 @@ dword_result_t NtSetInformationFile(
         info = 0;
         bool delete_on_close =
             (xe::load_and_swap<uint8_t>(file_info)) ? true : false;
-        XELOGW("NtSetInformationFile ignoring delete on close: %d",
+        XELOGW("NtSetInformationFile ignoring delete on close: {}",
                delete_on_close);
         break;
       }
diff --git a/src/xenia/kernel/xboxkrnl/xboxkrnl_memory.cc b/src/xenia/kernel/xboxkrnl/xboxkrnl_memory.cc
index 62179f6ed..c54ecc0eb 100644
--- a/src/xenia/kernel/xboxkrnl/xboxkrnl_memory.cc
+++ b/src/xenia/kernel/xboxkrnl/xboxkrnl_memory.cc
@@ -160,7 +160,7 @@ dword_result_t NtAllocateVirtualMemory(lpdword_t base_addr_ptr,
     }
   }
 
-  XELOGD("NtAllocateVirtualMemory = %.8X", address);
+  XELOGD("NtAllocateVirtualMemory = {:08X}", address);
 
   // Stash back.
   // Maybe set X_STATUS_ALREADY_COMMITTED if MEM_COMMIT?
@@ -356,7 +356,7 @@ dword_result_t MmAllocatePhysicalMemoryEx(dword_t flags, dword_t region_size,
     // Failed - assume no memory available.
     return 0;
   }
-  XELOGD("MmAllocatePhysicalMemoryEx = %.8X", base_address);
+  XELOGD("MmAllocatePhysicalMemoryEx = {:08X}", base_address);
 
   return base_address;
 }
diff --git a/src/xenia/kernel/xboxkrnl/xboxkrnl_module.cc b/src/xenia/kernel/xboxkrnl/xboxkrnl_module.cc
index 65a90c566..1eb89a816 100644
--- a/src/xenia/kernel/xboxkrnl/xboxkrnl_module.cc
+++ b/src/xenia/kernel/xboxkrnl/xboxkrnl_module.cc
@@ -65,8 +65,8 @@ bool XboxkrnlModule::SendPIXCommand(const char* cmd) {
       xe::countof(args));
   global_lock.lock();
 
-  XELOGD("PIX(command): %s", cmd);
-  XELOGD("PIX(response): %s", response);
+  XELOGD("PIX(command): {}", cmd);
+  XELOGD("PIX(response): {}", response);
 
   memory_->SystemHeapFree(scratch_ptr);
 
diff --git a/src/xenia/kernel/xboxkrnl/xboxkrnl_strings.cc b/src/xenia/kernel/xboxkrnl/xboxkrnl_strings.cc
index be0a94eb6..2045c1553 100644
--- a/src/xenia/kernel/xboxkrnl/xboxkrnl_strings.cc
+++ b/src/xenia/kernel/xboxkrnl/xboxkrnl_strings.cc
@@ -830,7 +830,7 @@ SHIM_CALL DbgPrint_shim(PPCContext* ppc_context, KernelState* kernel_state) {
     return;
   }
 
-  XELOGD("(DbgPrint) %s", data.str().c_str());
+  XELOGD("(DbgPrint) {}", data.str());
 
   SHIM_SET_RETURN_32(X_STATUS_SUCCESS);
 }
@@ -841,7 +841,7 @@ SHIM_CALL _snprintf_shim(PPCContext* ppc_context, KernelState* kernel_state) {
   int32_t buffer_count = SHIM_GET_ARG_32(1);
   uint32_t format_ptr = SHIM_GET_ARG_32(2);
 
-  XELOGD("_snprintf(%08X, %i, %08X, ...)", buffer_ptr, buffer_count,
+  XELOGD("_snprintf({:08X}, {}, {:08X}, ...)", buffer_ptr, buffer_count,
          format_ptr);
 
   if (buffer_ptr == 0 || buffer_count <= 0 || format_ptr == 0) {
@@ -877,7 +877,7 @@ SHIM_CALL sprintf_shim(PPCContext* ppc_context, KernelState* kernel_state) {
   uint32_t buffer_ptr = SHIM_GET_ARG_32(0);
   uint32_t format_ptr = SHIM_GET_ARG_32(1);
 
-  XELOGD("sprintf(%08X, %08X, ...)", buffer_ptr, format_ptr);
+  XELOGD("sprintf({:08X}, {:08X}, ...)", buffer_ptr, format_ptr);
 
   if (buffer_ptr == 0 || format_ptr == 0) {
     SHIM_SET_RETURN_32(-1);
@@ -906,7 +906,7 @@ SHIM_CALL _snwprintf_shim(PPCContext* ppc_context, KernelState* kernel_state) {
   int32_t buffer_count = SHIM_GET_ARG_32(1);
   uint32_t format_ptr = SHIM_GET_ARG_32(2);
 
-  XELOGD("_snwprintf(%08X, %i, %08X, ...)", buffer_ptr, buffer_count,
+  XELOGD("_snwprintf({:08X}, {}, {:08X}, ...)", buffer_ptr, buffer_count,
          format_ptr);
 
   if (buffer_ptr == 0 || buffer_count <= 0 || format_ptr == 0) {
@@ -942,7 +942,7 @@ SHIM_CALL swprintf_shim(PPCContext* ppc_context, KernelState* kernel_state) {
   uint32_t buffer_ptr = SHIM_GET_ARG_32(0);
   uint32_t format_ptr = SHIM_GET_ARG_32(1);
 
-  XELOGD("swprintf(%08X, %08X, ...)", buffer_ptr, format_ptr);
+  XELOGD("swprintf({:08X}, {:08X}, ...)", buffer_ptr, format_ptr);
 
   if (buffer_ptr == 0 || format_ptr == 0) {
     SHIM_SET_RETURN_32(-1);
@@ -972,7 +972,7 @@ SHIM_CALL _vsnprintf_shim(PPCContext* ppc_context, KernelState* kernel_state) {
   uint32_t format_ptr = SHIM_GET_ARG_32(2);
   uint32_t arg_ptr = SHIM_GET_ARG_32(3);
 
-  XELOGD("_vsnprintf(%08X, %i, %08X, %08X)", buffer_ptr, buffer_count,
+  XELOGD("_vsnprintf({:08X}, {}, {:08X}, {:08X})", buffer_ptr, buffer_count,
          format_ptr, arg_ptr);
 
   if (buffer_ptr == 0 || buffer_count <= 0 || format_ptr == 0) {
@@ -1012,7 +1012,7 @@ SHIM_CALL _vsnwprintf_shim(PPCContext* ppc_context, KernelState* kernel_state) {
   uint32_t format_ptr = SHIM_GET_ARG_32(2);
   uint32_t arg_ptr = SHIM_GET_ARG_32(3);
 
-  XELOGD("_vsnwprintf(%08X, %i, %08X, %08X)", buffer_ptr, buffer_count,
+  XELOGD("_vsnwprintf({:08X}, {}, {:08X}, {:08X})", buffer_ptr, buffer_count,
          format_ptr, arg_ptr);
 
   if (buffer_ptr == 0 || buffer_count <= 0 || format_ptr == 0) {
@@ -1051,7 +1051,7 @@ SHIM_CALL vsprintf_shim(PPCContext* ppc_context, KernelState* kernel_state) {
   uint32_t format_ptr = SHIM_GET_ARG_32(1);
   uint32_t arg_ptr = SHIM_GET_ARG_32(2);
 
-  XELOGD("vsprintf(%08X, %08X, %08X)", buffer_ptr, format_ptr, arg_ptr);
+  XELOGD("vsprintf({:08X}, {:08X}, {:08X})", buffer_ptr, format_ptr, arg_ptr);
 
   if (buffer_ptr == 0 || format_ptr == 0) {
     SHIM_SET_RETURN_32(-1);
@@ -1079,7 +1079,7 @@ SHIM_CALL _vscwprintf_shim(PPCContext* ppc_context, KernelState* kernel_state) {
   uint32_t format_ptr = SHIM_GET_ARG_32(0);
   uint32_t arg_ptr = SHIM_GET_ARG_32(1);
 
-  XELOGD("_vscwprintf(%08X, %08X)", format_ptr, arg_ptr);
+  XELOGD("_vscwprintf({:08X}, {:08X})", format_ptr, arg_ptr);
 
   if (format_ptr == 0) {
     SHIM_SET_RETURN_32(-1);
diff --git a/src/xenia/kernel/xboxkrnl/xboxkrnl_threading.cc b/src/xenia/kernel/xboxkrnl/xboxkrnl_threading.cc
index 4800f0455..36f6b2db9 100644
--- a/src/xenia/kernel/xboxkrnl/xboxkrnl_threading.cc
+++ b/src/xenia/kernel/xboxkrnl/xboxkrnl_threading.cc
@@ -129,7 +129,7 @@ dword_result_t ExCreateThread(lpdword_t handle_ptr, dword_t stack_size,
   X_STATUS result = thread->Create();
   if (XFAILED(result)) {
     // Failed!
-    XELOGE("Thread creation failed: %.8X", result);
+    XELOGE("Thread creation failed: {:08X}", result);
     return result;
   }
 
@@ -872,7 +872,7 @@ DECLARE_XBOXKRNL_EXPORT3(NtSignalAndWaitForSingleObjectEx, kThreading,
 
 uint32_t xeKeKfAcquireSpinLock(uint32_t* lock) {
   // XELOGD(
-  //     "KfAcquireSpinLock(%.8X)",
+  //     "KfAcquireSpinLock({:08X})",
   //     lock_ptr);
 
   // Lock.
diff --git a/src/xenia/kernel/xboxkrnl/xboxkrnl_video.cc b/src/xenia/kernel/xboxkrnl/xboxkrnl_video.cc
index d003e22be..b0a6eddc4 100644
--- a/src/xenia/kernel/xboxkrnl/xboxkrnl_video.cc
+++ b/src/xenia/kernel/xboxkrnl/xboxkrnl_video.cc
@@ -370,7 +370,7 @@ void VdSwap(lpvoid_t buffer_ptr,  // ptr into primary ringbuffer
   assert_true(frontbuffer_address != UINT32_MAX);
   if (frontbuffer_address == UINT32_MAX) {
     // Xenia-specific safety check.
-    XELOGE("VdSwap: Invalid front buffer virtual address 0x%.8X",
+    XELOGE("VdSwap: Invalid front buffer virtual address {:#08X}",
            fetch.base_address << 12);
     return;
   }
diff --git a/src/xenia/kernel/xevent.cc b/src/xenia/kernel/xevent.cc
index 0da5358bd..04efadfee 100644
--- a/src/xenia/kernel/xevent.cc
+++ b/src/xenia/kernel/xevent.cc
@@ -72,7 +72,7 @@ int32_t XEvent::Reset() {
 void XEvent::Clear() { event_->Reset(); }
 
 bool XEvent::Save(ByteStream* stream) {
-  XELOGD("XEvent %.8X (%s)", handle(), manual_reset_ ? "manual" : "auto");
+  XELOGD("XEvent {:08X} ({})", handle(), manual_reset_ ? "manual" : "auto");
   SaveObject(stream);
 
   bool signaled = true;
diff --git a/src/xenia/kernel/xfile.cc b/src/xenia/kernel/xfile.cc
index 0e1846a4d..1ab518963 100644
--- a/src/xenia/kernel/xfile.cc
+++ b/src/xenia/kernel/xfile.cc
@@ -226,7 +226,8 @@ void XFile::RemoveIOCompletionPort(uint32_t key) {
 }
 
 bool XFile::Save(ByteStream* stream) {
-  XELOGD("XFile %.8X (%s)", handle(), file_->entry()->absolute_path().c_str());
+  XELOGD("XFile {:08X} ({})", handle(),
+         file_->entry()->absolute_path().c_str());
 
   if (!SaveObject(stream)) {
     return false;
@@ -257,7 +258,7 @@ object_ref<XFile> XFile::Restore(KernelState* kernel_state,
   auto is_directory = stream->Read<bool>();
   auto is_synchronous = stream->Read<bool>();
 
-  XELOGD("XFile %.8X (%s)", file->handle(), abs_path.c_str());
+  XELOGD("XFile {:08X} ({})", file->handle(), abs_path);
 
   vfs::File* vfs_file = nullptr;
   vfs::FileAction action;
@@ -265,7 +266,7 @@ object_ref<XFile> XFile::Restore(KernelState* kernel_state,
       abs_path, vfs::FileDisposition::kOpen, access, is_directory, &vfs_file,
       &action);
   if (XFAILED(res)) {
-    XELOGE("Failed to open XFile: error %.8X", res);
+    XELOGE("Failed to open XFile: error {:08X}", res);
     return object_ref<XFile>(file);
   }
 
diff --git a/src/xenia/kernel/xmodule.cc b/src/xenia/kernel/xmodule.cc
index d8af132ef..26191c193 100644
--- a/src/xenia/kernel/xmodule.cc
+++ b/src/xenia/kernel/xmodule.cc
@@ -69,7 +69,7 @@ uint32_t XModule::GetHandleFromHModule(void* hmodule) {
 }
 
 bool XModule::Save(ByteStream* stream) {
-  XELOGD("XModule %.8X (%s)", handle(), path().c_str());
+  XELOGD("XModule {:08X} ({})", handle(), path());
 
   stream->Write('XMOD');
 
@@ -99,7 +99,7 @@ object_ref<XModule> XModule::Restore(KernelState* kernel_state,
     return nullptr;
   }
 
-  XELOGD("XModule %.8X (%s)", module->handle(), module->path().c_str());
+  XELOGD("XModule {:08X} ({})", module->handle(), module->path());
 
   module->hmodule_ptr_ = hmodule_ptr;
   return module;
diff --git a/src/xenia/kernel/xmutant.cc b/src/xenia/kernel/xmutant.cc
index 690ae1f11..a64c8d76f 100644
--- a/src/xenia/kernel/xmutant.cc
+++ b/src/xenia/kernel/xmutant.cc
@@ -59,7 +59,7 @@ bool XMutant::Save(ByteStream* stream) {
 
   uint32_t owning_thread_handle = owning_thread_ ? owning_thread_->handle() : 0;
   stream->Write<uint32_t>(owning_thread_handle);
-  XELOGD("XMutant %.8X (owner: %.8X)", handle(), owning_thread_handle);
+  XELOGD("XMutant {:08X} (owner: {:08X})", handle(), owning_thread_handle);
 
   return true;
 }
diff --git a/src/xenia/kernel/xsemaphore.cc b/src/xenia/kernel/xsemaphore.cc
index 38e75b3c3..74bf3e7e6 100644
--- a/src/xenia/kernel/xsemaphore.cc
+++ b/src/xenia/kernel/xsemaphore.cc
@@ -57,7 +57,8 @@ bool XSemaphore::Save(ByteStream* stream) {
     free_count++;
   }
 
-  XELOGD("XSemaphore %.8X (count %d/%d)", handle(), free_count, maximum_count_);
+  XELOGD("XSemaphore {:08X} (count {}/{})", handle(), free_count,
+         maximum_count_);
 
   // Restore the semaphore back to its previous count.
   semaphore_->Release(free_count, nullptr);
@@ -79,7 +80,7 @@ object_ref<XSemaphore> XSemaphore::Restore(KernelState* kernel_state,
 
   sem->maximum_count_ = stream->Read<uint32_t>();
   auto free_count = stream->Read<uint32_t>();
-  XELOGD("XSemaphore %.8X (count %d/%d)", sem->handle(), free_count,
+  XELOGD("XSemaphore {:08X} (count {}/{})", sem->handle(), free_count,
          sem->maximum_count_);
 
   sem->semaphore_ =
diff --git a/src/xenia/kernel/xthread.cc b/src/xenia/kernel/xthread.cc
index 7eb155e0a..458d7a592 100644
--- a/src/xenia/kernel/xthread.cc
+++ b/src/xenia/kernel/xthread.cc
@@ -340,7 +340,7 @@ X_STATUS XThread::Create() {
   // This is thread safe.
   thread_state_ = new cpu::ThreadState(kernel_state()->processor(), thread_id_,
                                        stack_base_, pcr_address_);
-  XELOGI("XThread%08X (%X) Stack: %.8X-%.8X", handle(), thread_id_,
+  XELOGI("XThread{:08X} ({:X}) Stack: {:08X}-{:08X}", handle(), thread_id_,
          stack_limit_, stack_base_);
 
   // Exports use this to get the kernel.
@@ -493,8 +493,8 @@ X_STATUS XThread::Terminate(int exit_code) {
 }
 
 void XThread::Execute() {
-  XELOGKERNEL("XThread::Execute thid %d (handle=%.8X, '%s', native=%.8X)",
-              thread_id_, handle(), thread_name_.c_str(), thread_->system_id());
+  XELOGKERNEL("XThread::Execute thid {} (handle={:08X}, '{}', native={:08X})",
+              thread_id_, handle(), thread_name_, thread_->system_id());
 
   // Let the kernel know we are starting.
   kernel_state()->OnThreadExecute(this);
@@ -593,7 +593,7 @@ void XThread::DeliverAPCs() {
     auto apc = reinterpret_cast<XAPC*>(memory()->TranslateVirtual(apc_ptr));
     bool needs_freeing = apc->kernel_routine == XAPC::kDummyKernelRoutine;
 
-    XELOGD("Delivering APC to %.8X", uint32_t(apc->normal_routine));
+    XELOGD("Delivering APC to {:08X}", uint32_t(apc->normal_routine));
 
     // Mark as uninserted so that it can be reinserted again by the routine.
     apc->enqueued = 0;
@@ -636,7 +636,7 @@ void XThread::DeliverAPCs() {
       LockApc();
     }
 
-    XELOGD("Completed delivery of APC to %.8X (%.8X, %.8X, %.8X)",
+    XELOGD("Completed delivery of APC to {:08X} ({:08X}, {:08X}, {:08X})",
            normal_routine, normal_context, arg1, arg2);
 
     // If special, free it.
@@ -852,13 +852,13 @@ bool XThread::Save(ByteStream* stream) {
     return false;
   }
 
-  XELOGD("XThread %.8X serializing...", handle());
+  XELOGD("XThread {:08X} serializing...", handle());
 
   uint32_t pc = 0;
   if (running_) {
     pc = emulator()->processor()->StepToGuestSafePoint(thread_id_);
     if (!pc) {
-      XELOGE("XThread %.8X failed to save: could not step to a safe point!",
+      XELOGE("XThread {:08X} failed to save: could not step to a safe point!",
              handle());
       assert_always();
       return false;
@@ -930,7 +930,7 @@ object_ref<XThread> XThread::Restore(KernelState* kernel_state,
     return nullptr;
   }
 
-  XELOGD("XThread %.8X", thread->handle());
+  XELOGD("XThread {:08X}", thread->handle());
 
   thread->thread_name_ = stream->Read<std::string>();
 
@@ -1041,8 +1041,8 @@ XHostThread::XHostThread(KernelState* kernel_state, uint32_t stack_size,
 
 void XHostThread::Execute() {
   XELOGKERNEL(
-      "XThread::Execute thid %d (handle=%.8X, '%s', native=%.8X, <host>)",
-      thread_id_, handle(), thread_name_.c_str(), thread_->system_id());
+      "XThread::Execute thid {} (handle={:08X}, '{}', native={:08X}, <host>)",
+      thread_id_, handle(), thread_name_, thread_->system_id());
 
   // Let the kernel know we are starting.
   kernel_state()->OnThreadExecute(this);
diff --git a/src/xenia/memory.cc b/src/xenia/memory.cc
index 15d788c28..834091a07 100644
--- a/src/xenia/memory.cc
+++ b/src/xenia/memory.cc
@@ -553,12 +553,11 @@ void Memory::DumpMap() {
   XELOGE("==================================================================");
   XELOGE("Memory Dump");
   XELOGE("==================================================================");
-  XELOGE("               System Page Size: %d (%.8X)", system_page_size_,
-         system_page_size_);
-  XELOGE("  System Allocation Granularity: %d (%.8X)",
-         system_allocation_granularity_, system_allocation_granularity_);
-  XELOGE("                Virtual Membase: %.16llX", virtual_membase_);
-  XELOGE("               Physical Membase: %.16llX", physical_membase_);
+  XELOGE("               System Page Size: {0} ({0:08X})", system_page_size_);
+  XELOGE("  System Allocation Granularity: {0} ({0:08X})",
+         system_allocation_granularity_);
+  XELOGE("                Virtual Membase: {}", virtual_membase_);
+  XELOGE("               Physical Membase: {}", physical_membase_);
   XELOGE("");
   XELOGE("------------------------------------------------------------------");
   XELOGE("Virtual Heaps");
@@ -663,14 +662,13 @@ void BaseHeap::Dispose() {
 void BaseHeap::DumpMap() {
   auto global_lock = global_critical_region_.Acquire();
   XELOGE("------------------------------------------------------------------");
-  XELOGE("Heap: %.8X-%.8X", heap_base_, heap_base_ + (heap_size_ - 1));
+  XELOGE("Heap: {:08X}-{:08X}", heap_base_, heap_base_ + (heap_size_ - 1));
   XELOGE("------------------------------------------------------------------");
-  XELOGE("            Heap Base: %.8X", heap_base_);
-  XELOGE("            Heap Size: %d (%.8X)", heap_size_, heap_size_);
-  XELOGE("            Page Size: %d (%.8X)", page_size_, page_size_);
-  XELOGE("           Page Count: %lld", page_table_.size());
-  XELOGE("  Host Address Offset: %d (%.8X)", host_address_offset_,
-         host_address_offset_);
+  XELOGE("            Heap Base: {:08X}", heap_base_);
+  XELOGE("            Heap Size: {0} ({0:08X})", heap_size_);
+  XELOGE("            Page Size: {0} ({0:08X})", page_size_);
+  XELOGE("           Page Count: {}", page_table_.size());
+  XELOGE("  Host Address Offset: {0} ({0:08X})", host_address_offset_);
   bool is_empty_span = false;
   uint32_t empty_span_start = 0;
   for (uint32_t i = 0; i < uint32_t(page_table_.size()); ++i) {
@@ -683,7 +681,7 @@ void BaseHeap::DumpMap() {
       continue;
     }
     if (is_empty_span) {
-      XELOGE("  %.8X-%.8X %6dp %10db unreserved",
+      XELOGE("  {:08X}-{:08X} {:6d}p {:10d}b unreserved",
              heap_base_ + empty_span_start * page_size_,
              heap_base_ + i * page_size_, i - empty_span_start,
              (i - empty_span_start) * page_size_);
@@ -697,14 +695,15 @@ void BaseHeap::DumpMap() {
     }
     char access_r = (page.current_protect & kMemoryProtectRead) ? 'R' : ' ';
     char access_w = (page.current_protect & kMemoryProtectWrite) ? 'W' : ' ';
-    XELOGE("  %.8X-%.8X %6dp %10db %s %c%c", heap_base_ + i * page_size_,
+    XELOGE("  {:08X}-{:08X} {:6d}p {:10d}b {} {}{}",
+           heap_base_ + i * page_size_,
            heap_base_ + (i + page.region_page_count) * page_size_,
            page.region_page_count, page.region_page_count * page_size_,
            state_name, access_r, access_w);
     i += page.region_page_count - 1;
   }
   if (is_empty_span) {
-    XELOGE("  %.8X-%.8X - %d unreserved pages)",
+    XELOGE("  {:08X}-{:08X} - {} unreserved pages)",
            heap_base_ + empty_span_start * page_size_,
            heap_base_ + (heap_size_ - 1),
            page_table_.size() - empty_span_start);
@@ -741,7 +740,7 @@ uint32_t BaseHeap::GetUnreservedPageCount() {
 }
 
 bool BaseHeap::Save(ByteStream* stream) {
-  XELOGD("Heap %.8X-%.8X", heap_base_, heap_base_ + (heap_size_ - 1));
+  XELOGD("Heap {:08X}-{:08X}", heap_base_, heap_base_ + (heap_size_ - 1));
 
   for (size_t i = 0; i < page_table_.size(); i++) {
     auto& page = page_table_[i];
@@ -769,7 +768,7 @@ bool BaseHeap::Save(ByteStream* stream) {
 }
 
 bool BaseHeap::Restore(ByteStream* stream) {
-  XELOGD("Heap %.8X-%.8X", heap_base_, heap_base_ + (heap_size_ - 1));
+  XELOGD("Heap {:08X}-{:08X}", heap_base_, heap_base_ + (heap_size_ - 1));
 
   for (size_t i = 0; i < page_table_.size(); i++) {
     auto& page = page_table_[i];
diff --git a/src/xenia/ui/d3d12/d3d12_context.cc b/src/xenia/ui/d3d12/d3d12_context.cc
index c5736b189..261c82628 100644
--- a/src/xenia/ui/d3d12/d3d12_context.cc
+++ b/src/xenia/ui/d3d12/d3d12_context.cc
@@ -149,7 +149,7 @@ bool D3D12Context::InitializeSwapChainBuffers() {
   for (uint32_t i = 0; i < kSwapChainBufferCount; ++i) {
     if (FAILED(
             swap_chain_->GetBuffer(i, IID_PPV_ARGS(&swap_chain_buffers_[i])))) {
-      XELOGE("Failed to get buffer %u of the swap chain", i);
+      XELOGE("Failed to get buffer {} of the swap chain", i);
       return false;
     }
   }
diff --git a/src/xenia/ui/d3d12/d3d12_immediate_drawer.cc b/src/xenia/ui/d3d12/d3d12_immediate_drawer.cc
index 8d321d3e4..2ffd82708 100644
--- a/src/xenia/ui/d3d12/d3d12_immediate_drawer.cc
+++ b/src/xenia/ui/d3d12/d3d12_immediate_drawer.cc
@@ -78,7 +78,7 @@ bool D3D12ImmediateTexture::Initialize(ID3D12Device* device) {
   if (FAILED(device->CreateCommittedResource(
           &util::kHeapPropertiesDefault, D3D12_HEAP_FLAG_NONE, &resource_desc,
           state_, nullptr, IID_PPV_ARGS(&resource_)))) {
-    XELOGE("Failed to create a %ux%u texture for immediate drawing", width,
+    XELOGE("Failed to create a {}x{} texture for immediate drawing", width,
            height);
     return false;
   }
@@ -358,7 +358,7 @@ void D3D12ImmediateDrawer::UpdateTexture(ImmediateTexture* texture,
           &util::kHeapPropertiesUpload, D3D12_HEAP_FLAG_NONE, &buffer_desc,
           D3D12_RESOURCE_STATE_GENERIC_READ, nullptr, IID_PPV_ARGS(&buffer)))) {
     XELOGE(
-        "Failed to create an upload buffer for a %ux%u texture for "
+        "Failed to create an upload buffer for a {}x{} texture for "
         "immediate drawing",
         width, height);
     return;
@@ -369,7 +369,7 @@ void D3D12ImmediateDrawer::UpdateTexture(ImmediateTexture* texture,
   void* buffer_mapping;
   if (FAILED(buffer->Map(0, &buffer_read_range, &buffer_mapping))) {
     XELOGE(
-        "Failed to map an upload buffer for a %ux%u texture for immediate "
+        "Failed to map an upload buffer for a {}x{} texture for immediate "
         "drawing",
         width, height);
     buffer->Release();
@@ -506,7 +506,7 @@ void D3D12ImmediateDrawer::BeginDrawBatch(const ImmediateDrawBatch& batch) {
       current_fence_value, vertex_buffer_view.SizeInBytes, nullptr, nullptr,
       &vertex_buffer_view.BufferLocation);
   if (vertex_buffer_mapping == nullptr) {
-    XELOGE("Failed to get a buffer for %u vertices in the immediate drawer",
+    XELOGE("Failed to get a buffer for {} vertices in the immediate drawer",
            batch.vertex_count);
     return;
   }
@@ -525,7 +525,7 @@ void D3D12ImmediateDrawer::BeginDrawBatch(const ImmediateDrawBatch& batch) {
         xe::align(index_buffer_view.SizeInBytes, UINT(sizeof(uint32_t))),
         nullptr, nullptr, &index_buffer_view.BufferLocation);
     if (index_buffer_mapping == nullptr) {
-      XELOGE("Failed to get a buffer for %u indices in the immediate drawer",
+      XELOGE("Failed to get a buffer for {} indices in the immediate drawer",
              batch.index_count);
       return;
     }
diff --git a/src/xenia/ui/d3d12/d3d12_provider.cc b/src/xenia/ui/d3d12/d3d12_provider.cc
index ece3beed4..99d122665 100644
--- a/src/xenia/ui/d3d12/d3d12_provider.cc
+++ b/src/xenia/ui/d3d12/d3d12_provider.cc
@@ -87,7 +87,7 @@ bool D3D12Provider::Initialize() {
   library_d3dcompiler_ = LoadLibraryW(L"D3DCompiler_47.dll");
   if (library_dxgi_ == nullptr || library_d3d12_ == nullptr ||
       library_d3dcompiler_ == nullptr) {
-    XELOGE("Failed to load dxgi.dll, D3D12.dll and D3DCompiler_47.dll.");
+    XELOGE("Failed to load dxgi.dll, D3D12.dll or D3DCompiler_47.dll.");
     return false;
   }
   bool libraries_loaded = true;
@@ -184,8 +184,8 @@ bool D3D12Provider::Initialize() {
     if (WideCharToMultiByte(CP_UTF8, 0, adapter_desc.Description, -1,
                             adapter_name_mb, adapter_name_mb_size, nullptr,
                             nullptr) != 0) {
-      XELOGD3D("DXGI adapter: %s (vendor %.4X, device %.4X)", adapter_name_mb,
-               adapter_desc.VendorId, adapter_desc.DeviceId);
+      XELOGD3D("DXGI adapter: {} (vendor {:04X}, device {:04X})",
+               adapter_name_mb, adapter_desc.VendorId, adapter_desc.DeviceId);
     }
   }
 
@@ -253,13 +253,13 @@ bool D3D12Provider::Initialize() {
         virtual_address_support.MaxGPUVirtualAddressBitsPerResource;
   }
   XELOGD3D("Direct3D 12 device features:");
-  XELOGD3D("* Max GPU virtual address bits per resource: %u",
+  XELOGD3D("* Max GPU virtual address bits per resource: {}",
            virtual_address_bits_per_resource_);
-  XELOGD3D("* Programmable sample positions: tier %u",
+  XELOGD3D("* Programmable sample positions: tier {}",
            programmable_sample_positions_tier_);
-  XELOGD3D("* Rasterizer-ordered views: %s",
+  XELOGD3D("* Rasterizer-ordered views: {}",
            rasterizer_ordered_views_supported_ ? "yes" : "no");
-  XELOGD3D("* Tiled resources: tier %u", tiled_resources_tier_);
+  XELOGD3D("* Tiled resources: tier {}", tiled_resources_tier_);
 
   // Get the graphics analysis interface, will silently fail if PIX is not
   // attached.
diff --git a/src/xenia/ui/d3d12/d3d12_util.cc b/src/xenia/ui/d3d12/d3d12_util.cc
index 5bbd566f2..0b80d3ceb 100644
--- a/src/xenia/ui/d3d12/d3d12_util.cc
+++ b/src/xenia/ui/d3d12/d3d12_util.cc
@@ -30,7 +30,7 @@ ID3D12RootSignature* CreateRootSignature(
           &desc, D3D_ROOT_SIGNATURE_VERSION_1, &blob, &error_blob))) {
     XELOGE("Failed to serialize a root signature");
     if (error_blob != nullptr) {
-      XELOGE("%s",
+      XELOGE("{}",
              reinterpret_cast<const char*>(error_blob->GetBufferPointer()));
       error_blob->Release();
     }
diff --git a/src/xenia/ui/d3d12/pools.cc b/src/xenia/ui/d3d12/pools.cc
index 2229d42be..4d632763f 100644
--- a/src/xenia/ui/d3d12/pools.cc
+++ b/src/xenia/ui/d3d12/pools.cc
@@ -105,7 +105,7 @@ uint8_t* UploadBufferPool::Request(uint64_t submission_index, uint32_t size,
               &util::kHeapPropertiesUpload, D3D12_HEAP_FLAG_NONE,
               &new_buffer_desc, D3D12_RESOURCE_STATE_GENERIC_READ, nullptr,
               IID_PPV_ARGS(&new_buffer)))) {
-        XELOGE("Failed to create a D3D upload buffer with %u bytes",
+        XELOGE("Failed to create a D3D upload buffer with {} bytes",
                page_size_);
         return nullptr;
       }
@@ -114,7 +114,7 @@ uint8_t* UploadBufferPool::Request(uint64_t submission_index, uint32_t size,
       read_range.End = 0;
       void* new_buffer_mapping;
       if (FAILED(new_buffer->Map(0, &read_range, &new_buffer_mapping))) {
-        XELOGE("Failed to map a D3D upload buffer with %u bytes", page_size_);
+        XELOGE("Failed to map a D3D upload buffer with {} bytes", page_size_);
         new_buffer->Release();
         return nullptr;
       }
@@ -263,7 +263,7 @@ uint64_t DescriptorHeapPool::Request(uint64_t submission_index,
     ID3D12DescriptorHeap* new_heap;
     if (FAILED(device_->CreateDescriptorHeap(&new_heap_desc,
                                              IID_PPV_ARGS(&new_heap)))) {
-      XELOGE("Failed to create a heap for %u shader-visible descriptors",
+      XELOGE("Failed to create a heap for {} shader-visible descriptors",
              page_size_);
       return kHeapIndexInvalid;
     }
diff --git a/src/xenia/ui/spirv/spirv_assembler.cc b/src/xenia/ui/spirv/spirv_assembler.cc
index 1a1c234f2..b7fc5c901 100644
--- a/src/xenia/ui/spirv/spirv_assembler.cc
+++ b/src/xenia/ui/spirv/spirv_assembler.cc
@@ -63,7 +63,7 @@ std::unique_ptr<SpirvAssembler::Result> SpirvAssembler::Assemble(
                                      source_text_length, &binary, &diagnostic);
   std::unique_ptr<Result> result(new Result(binary, diagnostic));
   if (result_code) {
-    XELOGE("Failed to assemble spv: %d", result_code);
+    XELOGE("Failed to assemble spv: {}", result_code);
     if (result->has_error()) {
       return result;
     } else {
diff --git a/src/xenia/ui/spirv/spirv_disassembler.cc b/src/xenia/ui/spirv/spirv_disassembler.cc
index 2945c6131..a8401c8ce 100644
--- a/src/xenia/ui/spirv/spirv_disassembler.cc
+++ b/src/xenia/ui/spirv/spirv_disassembler.cc
@@ -67,7 +67,7 @@ std::unique_ptr<SpirvDisassembler::Result> SpirvDisassembler::Disassemble(
                       SPV_BINARY_TO_TEXT_OPTION_INDENT, &text, &diagnostic);
   std::unique_ptr<Result> result(new Result(text, diagnostic));
   if (result_code) {
-    XELOGE("Failed to disassemble spv: %d", result_code);
+    XELOGE("Failed to disassemble spv: {}", result_code);
     if (result->has_error()) {
       return result;
     } else {
diff --git a/src/xenia/ui/spirv/spirv_validator.cc b/src/xenia/ui/spirv/spirv_validator.cc
index 87c68fd77..3d586d0ba 100644
--- a/src/xenia/ui/spirv/spirv_validator.cc
+++ b/src/xenia/ui/spirv/spirv_validator.cc
@@ -65,7 +65,7 @@ std::unique_ptr<SpirvValidator::Result> SpirvValidator::Validate(
   auto result_code = spvValidate(spv_context_, &binary, &diagnostic);
   std::unique_ptr<Result> result(new Result(text, diagnostic));
   if (result_code) {
-    XELOGE("Failed to validate spv: %d", result_code);
+    XELOGE("Failed to validate spv: {}", result_code);
     if (result->has_error()) {
       return result;
     } else {
diff --git a/src/xenia/ui/vk/transient_objects.cc b/src/xenia/ui/vk/transient_objects.cc
index ffa74e70c..774586298 100644
--- a/src/xenia/ui/vk/transient_objects.cc
+++ b/src/xenia/ui/vk/transient_objects.cc
@@ -93,9 +93,10 @@ bool UploadBufferChain::EnsureCurrentBufferAllocated() {
   if (vkCreateBuffer(device, &buffer_create_info, nullptr,
                      &upload_buffer.buffer) != VK_SUCCESS) {
     XELOGE(
-        "Failed to create a Vulkan upload buffer with %ull x %u bytes and "
-        "0x%.8X usage",
-        buffer_create_info.size, VulkanContext::kQueuedFrames, usage_flags_);
+        "Failed to create a Vulkan upload buffer with {} x {} bytes and "
+        "{:#08X} usage",
+        buffer_create_info.size, VulkanContext::kQueuedFrames,
+        static_cast<uint32_t>(usage_flags_));
     buffer_creation_failed_ = true;
     return false;
   }
@@ -110,8 +111,8 @@ bool UploadBufferChain::EnsureCurrentBufferAllocated() {
                                  VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT);
     if (memory_type_ == UINT32_MAX) {
       XELOGE(
-          "Failed to find a memory type for an upload buffer with %ull bytes "
-          "and 0x%.8X usage",
+          "Failed to find a memory type for an upload buffer with {} bytes "
+          "and {:#08X} usage",
           buffer_memory_requirements.size, usage_flags_);
       vkDestroyBuffer(device, upload_buffer.buffer, nullptr);
       buffer_creation_failed_ = true;
@@ -132,7 +133,7 @@ bool UploadBufferChain::EnsureCurrentBufferAllocated() {
   memory_allocate_info.memoryTypeIndex = memory_type_;
   if (vkAllocateMemory(device, &memory_allocate_info, nullptr,
                        &upload_buffer.memory) != VK_SUCCESS) {
-    XELOGE("Failed to allocate %ull for a Vulkan upload buffer",
+    XELOGE("Failed to allocate {} for a Vulkan upload buffer",
            memory_page_size_);
     vkDestroyBuffer(device, upload_buffer.buffer, nullptr);
     buffer_creation_failed_ = true;
@@ -141,7 +142,7 @@ bool UploadBufferChain::EnsureCurrentBufferAllocated() {
 
   if (vkBindBufferMemory(device, upload_buffer.buffer, upload_buffer.memory,
                          0) != VK_SUCCESS) {
-    XELOGE("Failed to bind a %ull-byte memory object to a Vulkan upload buffer",
+    XELOGE("Failed to bind a {}-byte memory object to a Vulkan upload buffer",
            memory_page_size_);
     vkDestroyBuffer(device, upload_buffer.buffer, nullptr);
     vkFreeMemory(device, upload_buffer.memory, nullptr);
@@ -151,7 +152,7 @@ bool UploadBufferChain::EnsureCurrentBufferAllocated() {
 
   if (vkMapMemory(device, upload_buffer.memory, 0, memory_page_size_, 0,
                   &upload_buffer.mapping) != VK_SUCCESS) {
-    XELOGE("Failed to map a %ull-byte memory object of a Vulkan upload buffer",
+    XELOGE("Failed to map a {}-byte memory object of a Vulkan upload buffer",
            memory_page_size_);
     vkDestroyBuffer(device, upload_buffer.buffer, nullptr);
     vkFreeMemory(device, upload_buffer.memory, nullptr);
diff --git a/src/xenia/ui/vk/vulkan_context.cc b/src/xenia/ui/vk/vulkan_context.cc
index 2426ecc54..d6c49cbff 100644
--- a/src/xenia/ui/vk/vulkan_context.cc
+++ b/src/xenia/ui/vk/vulkan_context.cc
@@ -471,7 +471,7 @@ void VulkanContext::BeginSwap() {
       swapchain_create_info.oldSwapchain = swapchain_;
       if (vkCreateSwapchainKHR(device, &swapchain_create_info, nullptr,
                                &swapchain) != VK_SUCCESS) {
-        XELOGE("Failed to create a %ux%u Vulkan swap chain",
+        XELOGE("Failed to create a {}x{} Vulkan swap chain",
                target_window_extent.width, target_window_extent.height);
         context_lost_ = true;
         return;
diff --git a/src/xenia/ui/vk/vulkan_immediate_drawer.cc b/src/xenia/ui/vk/vulkan_immediate_drawer.cc
index ecbbd8387..0936756aa 100644
--- a/src/xenia/ui/vk/vulkan_immediate_drawer.cc
+++ b/src/xenia/ui/vk/vulkan_immediate_drawer.cc
@@ -324,7 +324,7 @@ void VulkanImmediateDrawer::BeginDrawBatch(const ImmediateDrawBatch& batch) {
       vertex_buffer_size, vertex_buffer, vertex_buffer_offset);
   if (!vertex_buffer_mapping) {
     XELOGE(
-        "Failed to get a Vulkan buffer for %u vertices in the immediate drawer",
+        "Failed to get a Vulkan buffer for {} vertices in the immediate drawer",
         batch.vertex_count);
     return;
   }
@@ -343,7 +343,7 @@ void VulkanImmediateDrawer::BeginDrawBatch(const ImmediateDrawBatch& batch) {
         index_buffer, index_buffer_offset);
     if (!index_buffer_mapping) {
       XELOGE(
-          "Failed to get a Vulkan buffer for %u indices in the immediate "
+          "Failed to get a Vulkan buffer for {} indices in the immediate "
           "drawer",
           batch.index_count);
       return;
diff --git a/src/xenia/ui/vk/vulkan_provider.cc b/src/xenia/ui/vk/vulkan_provider.cc
index 5d370c7a9..bf37565fb 100644
--- a/src/xenia/ui/vk/vulkan_provider.cc
+++ b/src/xenia/ui/vk/vulkan_provider.cc
@@ -241,7 +241,7 @@ bool VulkanProvider::Initialize() {
                                       &physical_device_memory_properties_);
 
   // Log physical device properties.
-  XELOGVK("Vulkan physical device: %s (vendor %.4X, device %.4X)",
+  XELOGVK("Vulkan physical device: {} (vendor {:04X}, device {:04X})",
           physical_device_properties_.deviceName,
           physical_device_properties_.vendorID,
           physical_device_properties_.deviceID);
diff --git a/src/xenia/ui/vulkan/vulkan_instance.cc b/src/xenia/ui/vulkan/vulkan_instance.cc
index 782d73f2b..b324f86f2 100644
--- a/src/xenia/ui/vulkan/vulkan_instance.cc
+++ b/src/xenia/ui/vulkan/vulkan_instance.cc
@@ -70,7 +70,7 @@ VulkanInstance::~VulkanInstance() { DestroyInstance(); }
 
 bool VulkanInstance::Initialize() {
   auto version = Version::Parse(VK_API_VERSION);
-  XELOGVK("Initializing Vulkan %s...", version.pretty_string.c_str());
+  XELOGVK("Initializing Vulkan {}...", version.pretty_string);
   if (volkInitialize() != VK_SUCCESS) {
     XELOGE("volkInitialize() failed!");
     return false;
@@ -134,7 +134,7 @@ bool VulkanInstance::EnableRenderDoc() {
   int minor;
   int patch;
   api->GetAPIVersion(&major, &minor, &patch);
-  XELOGI("RenderDoc attached; %d.%d.%d", major, minor, patch);
+  XELOGI("RenderDoc attached; {}.{}.{}", major, minor, patch);
 
   is_renderdoc_attached_ = true;
 
@@ -173,18 +173,17 @@ bool VulkanInstance::QueryGlobals() {
     } while (err == VK_INCOMPLETE);
     CheckResult(err, "vkEnumerateInstanceExtensionProperties");
   }
-  XELOGVK("Found %d global layers:", global_layers_.size());
+  XELOGVK("Found {} global layers:", global_layers_.size());
   for (size_t i = 0; i < global_layers_.size(); ++i) {
     auto& global_layer = global_layers_[i];
     auto spec_version = Version::Parse(global_layer.properties.specVersion);
     auto impl_version =
         Version::Parse(global_layer.properties.implementationVersion);
-    XELOGVK("- %s (spec: %s, impl: %s)", global_layer.properties.layerName,
-            spec_version.pretty_string.c_str(),
-            impl_version.pretty_string.c_str());
-    XELOGVK("  %s", global_layer.properties.description);
+    XELOGVK("- {} (spec: {}, impl: {})", global_layer.properties.layerName,
+            spec_version.pretty_string, impl_version.pretty_string);
+    XELOGVK("  {}", global_layer.properties.description);
     if (!global_layer.extensions.empty()) {
-      XELOGVK("  %d extensions:", global_layer.extensions.size());
+      XELOGVK("  {} extensions:", global_layer.extensions.size());
       DumpExtensions(global_layer.extensions, "  ");
     }
   }
@@ -198,7 +197,7 @@ bool VulkanInstance::QueryGlobals() {
                                                  global_extensions_.data());
   } while (err == VK_INCOMPLETE);
   CheckResult(err, "vkEnumerateInstanceExtensionProperties");
-  XELOGVK("Found %d global extensions:", global_extensions_.size());
+  XELOGVK("Found {} global extensions:", global_extensions_.size());
   DumpExtensions(global_extensions_, "");
 
   return true;
@@ -249,7 +248,7 @@ bool VulkanInstance::CreateInstance() {
 
   auto err = vkCreateInstance(&instance_info, nullptr, &handle);
   if (err != VK_SUCCESS) {
-    XELOGE("vkCreateInstance returned %s", to_string(err));
+    XELOGE("vkCreateInstance returned {}", to_string(err));
   }
   switch (err) {
     case VK_SUCCESS:
@@ -270,7 +269,7 @@ bool VulkanInstance::CreateInstance() {
       XELOGE("Instance initialization failed; requested layer not present");
       return false;
     default:
-      XELOGE("Instance initialization failed; unknown: %s", to_string(err));
+      XELOGE("Instance initialization failed; unknown: {}", to_string(err));
       return false;
   }
 
@@ -325,7 +324,7 @@ VkBool32 VKAPI_PTR DebugMessageCallback(VkDebugReportFlagsEXT flags,
     message_type = "DEBUG";
   }
 
-  XELOGVK("[%s/%s:%d] %s", pLayerPrefix, message_type, messageCode, pMessage);
+  XELOGVK("[{}/{}:{}] {}", pLayerPrefix, message_type, messageCode, pMessage);
   return false;
 }
 
@@ -355,7 +354,7 @@ void VulkanInstance::EnableDebugValidation() {
   if (status == VK_SUCCESS) {
     XELOGVK("Debug validation layer enabled");
   } else {
-    XELOGVK("Debug validation layer failed to install; error %s",
+    XELOGVK("Debug validation layer failed to install; error {}",
             to_string(status));
   }
 }
@@ -437,10 +436,10 @@ bool VulkanInstance::QueryDevices() {
     available_devices_.push_back(std::move(device_info));
   }
 
-  XELOGVK("Found %d physical devices:", available_devices_.size());
+  XELOGVK("Found {} physical devices:", available_devices_.size());
   for (size_t i = 0; i < available_devices_.size(); ++i) {
     auto& device_info = available_devices_[i];
-    XELOGVK("- Device %d:", i);
+    XELOGVK("- Device {}:", i);
     DumpDeviceInfo(device_info);
   }
 
@@ -453,12 +452,11 @@ void VulkanInstance::DumpLayers(const std::vector<LayerInfo>& layers,
     auto& layer = layers[i];
     auto spec_version = Version::Parse(layer.properties.specVersion);
     auto impl_version = Version::Parse(layer.properties.implementationVersion);
-    XELOGVK("%s- %s (spec: %s, impl: %s)", indent, layer.properties.layerName,
-            spec_version.pretty_string.c_str(),
-            impl_version.pretty_string.c_str());
-    XELOGVK("%s  %s", indent, layer.properties.description);
+    XELOGVK("{}- {} (spec: {}, impl: {})", indent, layer.properties.layerName,
+            spec_version.pretty_string, impl_version.pretty_string);
+    XELOGVK("{}  {}", indent, layer.properties.description);
     if (!layer.extensions.empty()) {
-      XELOGVK("%s  %d extensions:", indent, layer.extensions.size());
+      XELOGVK("{}  {} extensions:", indent, layer.extensions.size());
       DumpExtensions(layer.extensions, std::strlen(indent) ? "    " : "  ");
     }
   }
@@ -469,8 +467,8 @@ void VulkanInstance::DumpExtensions(
   for (size_t i = 0; i < extensions.size(); ++i) {
     auto& extension = extensions[i];
     auto version = Version::Parse(extension.specVersion);
-    XELOGVK("%s- %s (%s)", indent, extension.extensionName,
-            version.pretty_string.c_str());
+    XELOGVK("{}- {} ({})", indent, extension.extensionName,
+            version.pretty_string);
   }
 }
 
@@ -478,21 +476,20 @@ void VulkanInstance::DumpDeviceInfo(const DeviceInfo& device_info) {
   auto& properties = device_info.properties;
   auto api_version = Version::Parse(properties.apiVersion);
   auto driver_version = Version::Parse(properties.driverVersion);
-  XELOGVK("  apiVersion     = %s", api_version.pretty_string.c_str());
-  XELOGVK("  driverVersion  = %s", driver_version.pretty_string.c_str());
-  XELOGVK("  vendorId       = 0x%04x", properties.vendorID);
-  XELOGVK("  deviceId       = 0x%04x", properties.deviceID);
-  XELOGVK("  deviceType     = %s", to_string(properties.deviceType));
-  XELOGVK("  deviceName     = %s", properties.deviceName);
+  XELOGVK("  apiVersion     = {}", api_version.pretty_string);
+  XELOGVK("  driverVersion  = {}", driver_version.pretty_string);
+  XELOGVK("  vendorId       = {:#04x}", properties.vendorID);
+  XELOGVK("  deviceId       = {:#04x}", properties.deviceID);
+  XELOGVK("  deviceType     = {}", to_string(properties.deviceType));
+  XELOGVK("  deviceName     = {}", properties.deviceName);
 
   auto& memory_props = device_info.memory_properties;
   XELOGVK("  Memory Heaps:");
   for (size_t j = 0; j < memory_props.memoryHeapCount; ++j) {
-    XELOGVK("  - Heap %u: %" PRIu64 " bytes", j,
-            memory_props.memoryHeaps[j].size);
+    XELOGVK("  - Heap {}: {} bytes", j, memory_props.memoryHeaps[j].size);
     for (size_t k = 0; k < memory_props.memoryTypeCount; ++k) {
       if (memory_props.memoryTypes[k].heapIndex == j) {
-        XELOGVK("    - Type %u:", k);
+        XELOGVK("    - Type {}:", k);
         auto type_flags = memory_props.memoryTypes[k].propertyFlags;
         if (!type_flags) {
           XELOGVK("      VK_MEMORY_PROPERTY_DEVICE_ONLY");
@@ -519,16 +516,16 @@ void VulkanInstance::DumpDeviceInfo(const DeviceInfo& device_info) {
   XELOGVK("  Queue Families:");
   for (size_t j = 0; j < device_info.queue_family_properties.size(); ++j) {
     auto& queue_props = device_info.queue_family_properties[j];
-    XELOGVK("  - Queue %d:", j);
+    XELOGVK("  - Queue {}:", j);
     XELOGVK(
-        "    queueFlags         = %s%s%s%s",
+        "    queueFlags         = {}{}{}{}",
         (queue_props.queueFlags & VK_QUEUE_GRAPHICS_BIT) ? "graphics, " : "",
         (queue_props.queueFlags & VK_QUEUE_COMPUTE_BIT) ? "compute, " : "",
         (queue_props.queueFlags & VK_QUEUE_TRANSFER_BIT) ? "transfer, " : "",
         (queue_props.queueFlags & VK_QUEUE_SPARSE_BINDING_BIT) ? "sparse, "
                                                                : "");
-    XELOGVK("    queueCount         = %u", queue_props.queueCount);
-    XELOGVK("    timestampValidBits = %u", queue_props.timestampValidBits);
+    XELOGVK("    queueCount         = {}", queue_props.queueCount);
+    XELOGVK("    timestampValidBits = {}", queue_props.timestampValidBits);
   }
 
   XELOGVK("  Layers:");
diff --git a/src/xenia/ui/vulkan/vulkan_swap_chain.cc b/src/xenia/ui/vulkan/vulkan_swap_chain.cc
index fda0c402e..ae91e493b 100644
--- a/src/xenia/ui/vulkan/vulkan_swap_chain.cc
+++ b/src/xenia/ui/vulkan/vulkan_swap_chain.cc
@@ -162,7 +162,7 @@ VkResult VulkanSwapChain::Initialize(VkSurfaceKHR surface) {
   if (surface_caps.maxImageCount > 0 &&
       image_count > surface_caps.maxImageCount) {
     // Too many requested - use whatever we can.
-    XELOGI("Requested number of swapchain images (%d) exceeds maximum (%d)",
+    XELOGI("Requested number of swapchain images ({}) exceeds maximum ({})",
            image_count, surface_caps.maxImageCount);
     image_count = surface_caps.maxImageCount;
   }
@@ -194,25 +194,25 @@ VkResult VulkanSwapChain::Initialize(VkSurfaceKHR surface) {
   create_info.oldSwapchain = nullptr;
 
   XELOGVK("Creating swap chain:");
-  XELOGVK("  minImageCount    = %u", create_info.minImageCount);
-  XELOGVK("  imageFormat      = %s", to_string(create_info.imageFormat));
-  XELOGVK("  imageExtent      = %d x %d", create_info.imageExtent.width,
+  XELOGVK("  minImageCount    = {}", create_info.minImageCount);
+  XELOGVK("  imageFormat      = {}", to_string(create_info.imageFormat));
+  XELOGVK("  imageExtent      = {} x {}", create_info.imageExtent.width,
           create_info.imageExtent.height);
   auto pre_transform_str = to_flags_string(create_info.preTransform);
-  XELOGVK("  preTransform     = %s", pre_transform_str.c_str());
-  XELOGVK("  imageArrayLayers = %u", create_info.imageArrayLayers);
-  XELOGVK("  presentMode      = %s", to_string(create_info.presentMode));
-  XELOGVK("  clipped          = %s", create_info.clipped ? "true" : "false");
-  XELOGVK("  imageColorSpace  = %s", to_string(create_info.imageColorSpace));
+  XELOGVK("  preTransform     = {}", pre_transform_str);
+  XELOGVK("  imageArrayLayers = {}", create_info.imageArrayLayers);
+  XELOGVK("  presentMode      = {}", to_string(create_info.presentMode));
+  XELOGVK("  clipped          = {}", create_info.clipped ? "true" : "false");
+  XELOGVK("  imageColorSpace  = {}", to_string(create_info.imageColorSpace));
   auto image_usage_flags_str = to_flags_string(
       static_cast<VkImageUsageFlagBits>(create_info.imageUsage));
-  XELOGVK("  imageUsageFlags  = %s", image_usage_flags_str.c_str());
-  XELOGVK("  imageSharingMode = %s", to_string(create_info.imageSharingMode));
-  XELOGVK("  queueFamilyCount = %u", create_info.queueFamilyIndexCount);
+  XELOGVK("  imageUsageFlags  = {}", image_usage_flags_str);
+  XELOGVK("  imageSharingMode = {}", to_string(create_info.imageSharingMode));
+  XELOGVK("  queueFamilyCount = {}", create_info.queueFamilyIndexCount);
 
   status = vkCreateSwapchainKHR(*device_, &create_info, nullptr, &handle);
   if (status != VK_SUCCESS) {
-    XELOGE("Failed to create swapchain: %s", to_string(status));
+    XELOGE("Failed to create swapchain: {}", to_string(status));
     return status;
   }
 
@@ -799,7 +799,7 @@ VkResult VulkanSwapChain::End() {
       // Fatal. Device lost.
       break;
     default:
-      XELOGE("Failed to queue present: %s", to_string(status));
+      XELOGE("Failed to queue present: {}", to_string(status));
       assert_always("Unexpected queue present failure");
   }
 
diff --git a/src/xenia/ui/vulkan/vulkan_util.cc b/src/xenia/ui/vulkan/vulkan_util.cc
index a5dceff46..a237b45d1 100644
--- a/src/xenia/ui/vulkan/vulkan_util.cc
+++ b/src/xenia/ui/vulkan/vulkan_util.cc
@@ -410,7 +410,7 @@ void FatalVulkanError(std::string error) {
 
 void CheckResult(VkResult result, const char* action) {
   if (result) {
-    XELOGE("Vulkan check: %s returned %s", action, to_string(result));
+    XELOGE("Vulkan check: {} returned {}", action, to_string(result));
   }
   assert_true(result == VK_SUCCESS, action);
 }
@@ -430,26 +430,26 @@ std::pair<bool, std::vector<const char*>> CheckRequirements(
         found = true;
         if (requirement.min_version > layer_infos[j].properties.specVersion) {
           if (requirement.is_optional) {
-            XELOGVK("- optional layer %s (%s) version mismatch", layer_name,
-                    layer_version.pretty_string.c_str());
+            XELOGVK("- optional layer {} ({}) version mismatch", layer_name,
+                    layer_version.pretty_string);
             continue;
           }
-          XELOGE("ERROR: required layer %s (%s) version mismatch", layer_name,
-                 layer_version.pretty_string.c_str());
+          XELOGE("ERROR: required layer {} ({}) version mismatch", layer_name,
+                 layer_version.pretty_string);
           any_missing = true;
           break;
         }
-        XELOGVK("- enabling layer %s (%s)", layer_name,
-                layer_version.pretty_string.c_str());
+        XELOGVK("- enabling layer {} ({})", layer_name,
+                layer_version.pretty_string);
         enabled_layers.push_back(layer_name);
         break;
       }
     }
     if (!found) {
       if (requirement.is_optional) {
-        XELOGVK("- optional layer %s not found", requirement.name.c_str());
+        XELOGVK("- optional layer {} not found", requirement.name);
       } else {
-        XELOGE("ERROR: required layer %s not found", requirement.name.c_str());
+        XELOGE("ERROR: required layer {} not found", requirement.name);
         any_missing = true;
       }
     }
@@ -472,27 +472,26 @@ std::pair<bool, std::vector<const char*>> CheckRequirements(
         found = true;
         if (requirement.min_version > extension_properties[j].specVersion) {
           if (requirement.is_optional) {
-            XELOGVK("- optional extension %s (%s) version mismatch",
-                    extension_name, extension_version.pretty_string.c_str());
+            XELOGVK("- optional extension {} ({}) version mismatch",
+                    extension_name, extension_version.pretty_string);
             continue;
           }
-          XELOGE("ERROR: required extension %s (%s) version mismatch",
-                 extension_name, extension_version.pretty_string.c_str());
+          XELOGE("ERROR: required extension {} ({}) version mismatch",
+                 extension_name, extension_version.pretty_string);
           any_missing = true;
           break;
         }
-        XELOGVK("- enabling extension %s (%s)", extension_name,
-                extension_version.pretty_string.c_str());
+        XELOGVK("- enabling extension {} ({})", extension_name,
+                extension_version.pretty_string);
         enabled_extensions.push_back(extension_name);
         break;
       }
     }
     if (!found) {
       if (requirement.is_optional) {
-        XELOGVK("- optional extension %s not found", requirement.name.c_str());
+        XELOGVK("- optional extension {} not found", requirement.name);
       } else {
-        XELOGE("ERROR: required extension %s not found",
-               requirement.name.c_str());
+        XELOGE("ERROR: required extension {} not found", requirement.name);
         any_missing = true;
       }
     }
diff --git a/src/xenia/ui/window_win.cc b/src/xenia/ui/window_win.cc
index aadd27c3f..eb0609a89 100644
--- a/src/xenia/ui/window_win.cc
+++ b/src/xenia/ui/window_win.cc
@@ -66,7 +66,7 @@ bool Win32Window::OnCreate() {
       auto spda = (decltype(&SetProcessDpiAwareness))SetProcessDpiAwareness_;
       auto res = spda(PROCESS_PER_MONITOR_DPI_AWARE);
       if (res != S_OK) {
-        XELOGW("Failed to set process DPI awareness. (code = 0x%.8X)", res);
+        XELOGW("Failed to set process DPI awareness. (code = {:#08X})", res);
       }
     }
 
diff --git a/src/xenia/vfs/devices/disc_image_device.cc b/src/xenia/vfs/devices/disc_image_device.cc
index d473eb10d..918701f88 100644
--- a/src/xenia/vfs/devices/disc_image_device.cc
+++ b/src/xenia/vfs/devices/disc_image_device.cc
@@ -36,13 +36,13 @@ bool DiscImageDevice::Initialize() {
   state.size = mmap_->size();
   auto result = Verify(&state);
   if (result != Error::kSuccess) {
-    XELOGE("Failed to verify disc image header: %d", result);
+    XELOGE("Failed to verify disc image header: {}", result);
     return false;
   }
 
   result = ReadAllEntries(&state, state.ptr + state.root_offset);
   if (result != Error::kSuccess) {
-    XELOGE("Failed to read all GDFX entries: %d", result);
+    XELOGE("Failed to read all GDFX entries: {}", result);
     return false;
   }
 
@@ -59,7 +59,7 @@ Entry* DiscImageDevice::ResolvePath(const std::string_view path) {
   // be in the form:
   // some\PATH.foo
 
-  XELOGFS("DiscImageDevice::ResolvePath(%s)", path.c_str());
+  XELOGFS("DiscImageDevice::ResolvePath({})", path);
 
   // Walk the path, one separator at a time.
   auto entry = root_entry_.get();
diff --git a/src/xenia/vfs/devices/host_path_device.cc b/src/xenia/vfs/devices/host_path_device.cc
index 4b7d22528..04b43bd66 100644
--- a/src/xenia/vfs/devices/host_path_device.cc
+++ b/src/xenia/vfs/devices/host_path_device.cc
@@ -54,7 +54,7 @@ Entry* HostPathDevice::ResolvePath(const std::string_view path) {
   // be in the form:
   // some\PATH.foo
 
-  XELOGFS("HostPathDevice::ResolvePath(%s)", path.c_str());
+  XELOGFS("HostPathDevice::ResolvePath({})", path);
 
   // Walk the path, one separator at a time.
   auto entry = root_entry_.get();
diff --git a/src/xenia/vfs/devices/stfs_container_device.cc b/src/xenia/vfs/devices/stfs_container_device.cc
index 92bd765b7..6bc3b0e22 100644
--- a/src/xenia/vfs/devices/stfs_container_device.cc
+++ b/src/xenia/vfs/devices/stfs_container_device.cc
@@ -62,21 +62,21 @@ StfsContainerDevice::~StfsContainerDevice() = default;
 bool StfsContainerDevice::Initialize() {
   // Resolve a valid STFS file if a directory is given.
   if (filesystem::IsFolder(host_path_) && !ResolveFromFolder(host_path_)) {
-    XELOGE("Could not resolve an STFS container given path %s",
-           xe::path_to_utf8(host_path_).c_str());
+    XELOGE("Could not resolve an STFS container given path {}",
+           xe::path_to_utf8(host_path_));
     return false;
   }
 
   if (!filesystem::PathExists(host_path_)) {
-    XELOGE("Path to STFS container does not exist: %s",
-           xe::path_to_utf8(host_path_).c_str());
+    XELOGE("Path to STFS container does not exist: {}",
+           xe::path_to_utf8(host_path_));
     return false;
   }
 
   // Map the data file(s)
   auto map_result = MapFiles();
   if (map_result != Error::kSuccess) {
-    XELOGE("Failed to map STFS container: %d", map_result);
+    XELOGE("Failed to map STFS container: {}", map_result);
     return false;
   }
 
@@ -87,14 +87,14 @@ bool StfsContainerDevice::Initialize() {
     case StfsDescriptorType::kSvod:
       return ReadSVOD() == Error::kSuccess;
     default:
-      XELOGE("Unknown STFS Descriptor Type: %d", header_.descriptor_type);
+      XELOGE("Unknown STFS Descriptor Type: {}", header_.descriptor_type);
       return false;
   }
 }
 
 StfsContainerDevice::Error StfsContainerDevice::MapFiles() {
   // Map the file containing the STFS Header and read it.
-  XELOGI("Mapping STFS Header file: %s", xe::path_to_utf8(host_path_).c_str());
+  XELOGI("Mapping STFS Header file: {}", xe::path_to_utf8(host_path_));
   auto header_map = MappedMemory::Open(host_path_, MappedMemory::Mode::kRead);
   if (!header_map) {
     XELOGE("Error mapping STFS Header file.");
@@ -104,7 +104,7 @@ StfsContainerDevice::Error StfsContainerDevice::MapFiles() {
   auto header_result =
       ReadHeaderAndVerify(header_map->data(), header_map->size());
   if (header_result != Error::kSuccess) {
-    XELOGE("Error reading STFS Header: %d", header_result);
+    XELOGE("Error reading STFS Header: {}", header_result);
     return header_result;
   }
 
@@ -121,8 +121,8 @@ StfsContainerDevice::Error StfsContainerDevice::MapFiles() {
   // the files in the .data folder and can discard the header.
   auto data_fragment_path = host_path_ / ".data";
   if (!filesystem::PathExists(data_fragment_path)) {
-    XELOGE("STFS container is multi-file, but path %s does not exist.",
-           xe::path_to_utf8(data_fragment_path).c_str());
+    XELOGE("STFS container is multi-file, but path {} does not exist.",
+           xe::path_to_utf8(data_fragment_path));
     return Error::kErrorFileMismatch;
   }
 
@@ -134,7 +134,7 @@ StfsContainerDevice::Error StfsContainerDevice::MapFiles() {
             });
 
   if (fragment_files.size() != header_.data_file_count) {
-    XELOGE("SVOD expecting %d data fragments, but %d are present.",
+    XELOGE("SVOD expecting {} data fragments, but {} are present.",
            header_.data_file_count, fragment_files.size());
     return Error::kErrorFileMismatch;
   }
@@ -144,13 +144,13 @@ StfsContainerDevice::Error StfsContainerDevice::MapFiles() {
     auto path = file.path / file.name;
     auto data = MappedMemory::Open(path, MappedMemory::Mode::kRead);
     if (!data) {
-      XELOGI("Failed to map SVOD file %s.", xe::path_to_utf8(path).c_str());
+      XELOGI("Failed to map SVOD file {}.", xe::path_to_utf8(path));
       mmap_.clear();
       return Error::kErrorReadError;
     }
     mmap_.emplace(std::make_pair(i, std::move(data)));
   }
-  XELOGI("SVOD successfully mapped %d files.", fragment_files.size());
+  XELOGI("SVOD successfully mapped {} files.", fragment_files.size());
   return Error::kSuccess;
 }
 
@@ -164,7 +164,7 @@ Entry* StfsContainerDevice::ResolvePath(const std::string_view path) {
   // be in the form:
   // some\PATH.foo
 
-  XELOGFS("StfsContainerDevice::ResolvePath(%s)", path.c_str());
+  XELOGFS("StfsContainerDevice::ResolvePath({})", path);
 
   // Walk the path, one separator at a time.
   auto entry = root_entry_.get();
@@ -642,7 +642,7 @@ StfsContainerDevice::BlockHash StfsContainerDevice::GetBlockHash(
 bool StfsVolumeDescriptor::Read(const uint8_t* p) {
   descriptor_size = xe::load_and_swap<uint8_t>(p + 0x00);
   if (descriptor_size != 0x24) {
-    XELOGE("STFS volume descriptor size mismatch, expected 0x24 but got 0x%X",
+    XELOGE("STFS volume descriptor size mismatch, expected 0x24 but got {:#X}",
            descriptor_size);
     return false;
   }
@@ -659,7 +659,7 @@ bool StfsVolumeDescriptor::Read(const uint8_t* p) {
 bool SvodVolumeDescriptor::Read(const uint8_t* p) {
   descriptor_size = xe::load<uint8_t>(p + 0x00);
   if (descriptor_size != 0x24) {
-    XELOGE("SVOD volume descriptor size mismatch, expected 0x24 but got 0x%X",
+    XELOGE("SVOD volume descriptor size mismatch, expected 0x24 but got {:#X}",
            descriptor_size);
     return false;
   }
@@ -703,7 +703,7 @@ bool StfsHeader::Read(const uint8_t* p) {
       svod_volume_descriptor.Read(p + 0x379);
       break;
     default:
-      XELOGE("STFS descriptor format not supported: %d", descriptor_type);
+      XELOGE("STFS descriptor format not supported: {}", descriptor_type);
       return false;
   }
   memcpy(device_id, p + 0x3FD, 0x14);
@@ -764,7 +764,7 @@ bool StfsContainerDevice::ResolveFromFolder(const std::filesystem::path& path) {
       if (map && ReadPackageType(map->data(), map->size(), nullptr) ==
                      Error::kSuccess) {
         host_path_ = current_file.path / current_file.name;
-        XELOGI("STFS Package found: %s", xe::path_to_utf8(host_path_).c_str());
+        XELOGI("STFS Package found: {}", xe::path_to_utf8(host_path_));
         return true;
       }
     }
diff --git a/src/xenia/vfs/vfs_dump.cc b/src/xenia/vfs/vfs_dump.cc
index 4f7b268c2..282a8b0a7 100644
--- a/src/xenia/vfs/vfs_dump.cc
+++ b/src/xenia/vfs/vfs_dump.cc
@@ -29,7 +29,7 @@ DEFINE_transient_path(dump_path, "",
 
 int vfs_dump_main(const std::vector<std::string>& args) {
   if (cvars::source.empty() || cvars::dump_path.empty()) {
-    XELOGE("Usage: %s [source] [dump_path]", xe::path_to_utf8(args[0]).c_str());
+    XELOGE("Usage: {} [source] [dump_path]", xe::path_to_utf8(args[0]));
     return 1;
   }
 
@@ -59,7 +59,7 @@ int vfs_dump_main(const std::vector<std::string>& args) {
       queue.push(entry.get());
     }
 
-    XELOGI("%s", entry->path().c_str());
+    XELOGI("{}", entry->path());
     auto dest_name = base_path / xe::to_path(entry->path());
     if (entry->attributes() & kFileAttributeDirectory) {
       xe::filesystem::CreateFolder(dest_name);
diff --git a/src/xenia/vfs/virtual_file_system.cc b/src/xenia/vfs/virtual_file_system.cc
index f625d90e1..76dfb019a 100644
--- a/src/xenia/vfs/virtual_file_system.cc
+++ b/src/xenia/vfs/virtual_file_system.cc
@@ -36,7 +36,7 @@ bool VirtualFileSystem::UnregisterDevice(const std::string_view path) {
   auto global_lock = global_critical_region_.Acquire();
   for (auto it = devices_.begin(); it != devices_.end(); ++it) {
     if ((*it)->mount_path() == path) {
-      XELOGD("Unregistered device: %s", (*it)->mount_path().c_str());
+      XELOGD("Unregistered device: {}", (*it)->mount_path());
       devices_.erase(it);
       return true;
     }
@@ -48,8 +48,7 @@ bool VirtualFileSystem::RegisterSymbolicLink(const std::string_view path,
                                              const std::string_view target) {
   auto global_lock = global_critical_region_.Acquire();
   symlinks_.insert({std::string(path), std::string(target)});
-  XELOGD("Registered symbolic link: %s => %s", std::string(path).c_str(),
-         std::string(target).c_str());
+  XELOGD("Registered symbolic link: {} => {}", path, target);
 
   return true;
 }
@@ -62,8 +61,7 @@ bool VirtualFileSystem::UnregisterSymbolicLink(const std::string_view path) {
   if (it == symlinks_.end()) {
     return false;
   }
-  XELOGD("Unregistered symbolic link: %s => %s", it->first.c_str(),
-         it->second.c_str());
+  XELOGD("Unregistered symbolic link: {} => {}", it->first, it->second);
 
   symlinks_.erase(it);
   return true;
@@ -120,8 +118,7 @@ Entry* VirtualFileSystem::ResolvePath(const std::string_view path) {
         return xe::utf8::starts_with(normalized_path, d->mount_path());
       });
   if (it == devices_.cend()) {
-    XELOGE("ResolvePath(%s) failed - device not found",
-           std::string(path).c_str());
+    XELOGE("ResolvePath({}) failed - device not found", path);
     return nullptr;
   }
 
diff --git a/third_party/mspack/logging.cc b/third_party/mspack/logging.cc
index 0cc4009cd..65e4f015b 100644
--- a/third_party/mspack/logging.cc
+++ b/third_party/mspack/logging.cc
@@ -8,5 +8,5 @@ extern "C" void xenia_log(const char* fmt, ...) {
   va_start(args, fmt);
   vsnprintf(buffer, sizeof(buffer), fmt, args);
   va_end(args);
-  XELOGW("mspack: %s", buffer);
+  XELOGW("mspack: {}", buffer);
 }