From 4fb1e7517c8586cbd6db4ea935ac2bd191ebc520 Mon Sep 17 00:00:00 2001
From: "alexey.lysiuk" <alexey.lysiuk@gmail.com>
Date: Sun, 3 Aug 2014 12:39:42 +0300
Subject: [PATCH] Added support for VSync option in Cocoa back-end

---
 src/sdl/sdlvideo.cpp | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/src/sdl/sdlvideo.cpp b/src/sdl/sdlvideo.cpp
index 92741d3257..c869545abd 100644
--- a/src/sdl/sdlvideo.cpp
+++ b/src/sdl/sdlvideo.cpp
@@ -15,6 +15,10 @@
 
 #include <SDL.h>
 
+#ifdef __APPLE__
+#include <OpenGL/OpenGL.h>
+#endif // __APPLE__
+
 // MACROS ------------------------------------------------------------------
 
 // TYPES -------------------------------------------------------------------
@@ -43,6 +47,8 @@ public:
 
 	friend class SDLVideo;
 
+	virtual void SetVSync (bool vsync);
+
 private:
 	PalEntry SourcePalette[256];
 	BYTE GammaTable[3][256];
@@ -82,6 +88,7 @@ extern bool GUICapture;
 EXTERN_CVAR (Float, Gamma)
 EXTERN_CVAR (Int, vid_maxfps)
 EXTERN_CVAR (Bool, cl_capfps)
+EXTERN_CVAR (Bool, vid_vsync)
 
 // PUBLIC DATA DEFINITIONS -------------------------------------------------
 
@@ -326,6 +333,7 @@ SDLFB::SDLFB (int width, int height, bool fullscreen)
 	}
 	memcpy (SourcePalette, GPalette.BaseColors, sizeof(PalEntry)*256);
 	UpdateColors ();
+	SetVSync (vid_vsync);
 }
 
 SDLFB::~SDLFB ()
@@ -535,6 +543,19 @@ bool SDLFB::IsFullscreen ()
 	return (Screen->flags & SDL_FULLSCREEN) != 0;
 }
 
+void SDLFB::SetVSync (bool vsync)
+{
+#ifdef __APPLE__
+	if (CGLContextObj context = CGLGetCurrentContext())
+	{
+		// Apply vsync for native backend only (where OpenGL context is set)
+
+		const GLint value = vsync ? 1 : 0;
+		CGLSetParameter(context, kCGLCPSwapInterval, &value);
+	}
+#endif // __APPLE__
+}
+
 ADD_STAT (blit)
 {
 	FString out;