Merge pull request #11586 from JosJuice/unknown-opcode-msg

VideoCommon: Reword the unknown opcode error message

Source/Core/Core/CoreTiming.cpp

@@ -417,6 +417,11 @@ bool CoreTimingManager::GetVISkip() const
   return m_throttle_disable_vi_int && g_ActiveConfig.bVISkip && !Core::WantsDeterminism();
 }
 
+bool CoreTimingManager::UseSyncOnSkipIdle() const
+{
+  return m_config_sync_on_skip_idle;
+}
+
 void CoreTimingManager::LogPendingEvents() const
 {
   auto clone = m_event_queue;

Source/Core/Core/CoreTiming.h

@@ -150,6 +150,8 @@ public:
   TimePoint GetCPUTimePoint(s64 cyclesLate) const;  // Used by Dolphin Analytics
   bool GetVISkip() const;                           // Used By VideoInterface
 
+  bool UseSyncOnSkipIdle() const;
+
 private:
   Globals m_globals;
 

Source/Core/VideoCommon/CommandProcessor.cpp

@@ -12,6 +12,7 @@
 #include "Common/CommonTypes.h"
 #include "Common/Flag.h"
 #include "Common/Logging/Log.h"
+#include "Common/MsgHandler.h"
 #include "Core/ConfigManager.h"
 #include "Core/CoreTiming.h"
 #include "Core/HW/GPFifo.h"
@@ -695,16 +696,50 @@ void CommandProcessorManager::HandleUnknownOpcode(Core::System& system, u8 cmd_b
   {
     m_is_fifo_error_seen = true;
 
-    // TODO(Omega): Maybe dump FIFO to file on this error
+    // The panic alert contains an explanatory part that's worded differently depending on the
+    // user's settings, so as to offer the most relevant advice to the user.
+    const char* advice;
+    if (IsOnThread(system) && !system.GetFifo().UseDeterministicGPUThread())
+    {
+      if (!system.GetCoreTiming().UseSyncOnSkipIdle() && !system.GetFifo().UseSyncGPU())
+      {
+// The SyncOnSkipIdle setting is only in the Android GUI, so we use the INI name on other platforms.
+//
+// TODO: Mark the Android string as translatable once we have translations on Android. It's
+// currently untranslatable so translators won't try to look up how they translated "Synchronize
+// GPU Thread" and "On Idle Skipping" and then not find those strings and become confused.
+#ifdef ANDROID
+        advice = "Please change the \"Synchronize GPU Thread\" setting to \"On Idle Skipping\"! "
+                 "It's currently set to \"Never\", which makes this problem very likely to happen.";
+#else
+        // i18n: Please leave SyncOnSkipIdle and True untranslated.
+        // The user needs to enter these terms as-is in an INI file.
+        advice = _trans("Please change the \"SyncOnSkipIdle\" setting to \"True\"! "
+                        "It's currently disabled, which makes this problem very likely to happen.");
+#endif
+      }
+      else
+      {
+        advice = _trans(
+            "This error is usually caused by the emulated GPU desyncing with the emulated CPU. "
+            "Turn off the \"Dual Core\" setting to avoid this.");
+      }
+    }
+    else
+    {
+      advice = _trans(
+          "This error is usually caused by the emulated GPU desyncing with the emulated CPU, "
+          "but your current settings make this unlikely to happen. If this error is stopping the "
+          "game from working, please report it to the developers.");
+    }
+
     PanicAlertFmtT("GFX FIFO: Unknown Opcode ({0:#04x} @ {1}, preprocess={2}).\n"
-                   "This means one of the following:\n"
-                   "* The emulated GPU got desynced, disabling dual core can help\n"
-                   "* Command stream corrupted by some spurious memory bug\n"
-                   "* This really is an unknown opcode (unlikely)\n"
-                   "* Some other sort of bug\n\n"
-                   "Further errors will be sent to the Video Backend log and\n"
+                   "\n"
+                   "{3}\n"
+                   "\n"
+                   "Further errors will be sent to the Video Backend log and "
                    "Dolphin will now likely crash or hang.",
-                   cmd_byte, fmt::ptr(buffer), preprocess);
+                   cmd_byte, fmt::ptr(buffer), preprocess, Common::GetStringT(advice));
   }
 }
 

Source/Core/VideoCommon/Fifo.h

@@ -54,6 +54,7 @@ public:
   void PauseAndLock(Core::System& system, bool doLock, bool unpauseOnUnlock);
   void UpdateWantDeterminism(Core::System& system, bool want);
   bool UseDeterministicGPUThread() const { return m_use_deterministic_gpu_thread; }
+  bool UseSyncGPU() const { return m_config_sync_gpu; }
 
   // In deterministic GPU thread mode this waits for the GPU to be done with pending work.
   void SyncGPU(SyncGPUReason reason, bool may_move_read_ptr = true);