From d33465a56c74faeac06f65b53b3889270611b40f Mon Sep 17 00:00:00 2001
From: Henrik Rydgard <hrydgard@gmail.com>
Date: Sun, 14 Apr 2013 10:48:42 +0200
Subject: [PATCH] Better framerate throttling in UI

---
 Core/Core.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/Core/Core.cpp b/Core/Core.cpp
index 3c0b3d54b1..c71893d5f5 100644
--- a/Core/Core.cpp
+++ b/Core/Core.cpp
@@ -107,6 +107,7 @@ void Core_RunLoop()
 {
 	while (!coreState) {
 		time_update();
+		double startTime = time_now_d();
 		UpdateScreenScale();
 		{
 			{
@@ -129,10 +130,13 @@ void Core_RunLoop()
 			EndInputState(&input_state);
 		}
 		NativeRender();
+		time_update();
 		// Simple throttling to not burn the GPU in the menu.
 #ifdef _WIN32
 		if (globalUIState != UISTATE_INGAME) {
-			Sleep(15);
+			double sleepTime = 16.666 - (time_now_d() - startTime) * 1000.0;
+			if (sleepTime > 0.0)
+				Sleep((int)sleepTime);
 			GL_SwapBuffers();
 		} else if (!Core_IsStepping()) {
 			GL_SwapBuffers();