From faaf900eb72743c63afc05aa6b121ac0ec816514 Mon Sep 17 00:00:00 2001
From: Idiot <dork@dork.com>
Date: Thu, 6 Jul 2023 14:53:07 -0500
Subject: [PATCH] More precise std::chrono throttle implementation.

---
 external/glslang               |  2 +-
 vulkan/std_chrono_throttle.cpp | 32 +++++++++++++++++++++++++++++---
 2 files changed, 30 insertions(+), 4 deletions(-)

diff --git a/external/glslang b/external/glslang
index 9c7fd1a3..3ebb72cc 160000
--- a/external/glslang
+++ b/external/glslang
@@ -1 +1 @@
-Subproject commit 9c7fd1a33e5cecbe465e1cd70170167d5e40d398
+Subproject commit 3ebb72cc7429f0ab8218104dc3687c659c0f364d
diff --git a/vulkan/std_chrono_throttle.cpp b/vulkan/std_chrono_throttle.cpp
index 86b95540..d6c53a1a 100644
--- a/vulkan/std_chrono_throttle.cpp
+++ b/vulkan/std_chrono_throttle.cpp
@@ -25,18 +25,44 @@ void Throttle::wait_for_frame()
         std::this_thread::sleep_for(time_to_wait);
 }
 
+#ifdef _WIN32
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+#endif
 void Throttle::wait_for_frame_and_rebase_time()
 {
+#ifdef _WIN32
+    static HANDLE timer = nullptr;
+
+    if (timer == nullptr)
+        timer = CreateWaitableTimer(nullptr, true, nullptr);
+#endif
+
     auto time_to_wait = remaining();
 
     if (time_to_wait < -frame_duration_us / 10)
         reset();
 
-    if (time_to_wait.count() > 0)
+    if (time_to_wait.count() > 1000)
     {
-        std::this_thread::sleep_for(time_to_wait);
-        advance();
+#ifdef _WIN32
+        LARGE_INTEGER li;
+		li.QuadPart = -(time_to_wait.count() - 1000) * 10;
+		SetWaitableTimer(timer, &li, 0, nullptr, nullptr, false);
+		WaitForSingleObject(timer, INFINITE);
+#else
+        std::this_thread::sleep_for(time_to_wait - 1000);
+#endif
     }
+
+    time_to_wait = remaining();
+    while (time_to_wait.count() > 0)
+    {
+        std::this_thread::yield();
+        time_to_wait = remaining();
+    }
+
+    advance();
 }
 
 void Throttle::advance()