From 3b83514df48a060a75d4c416a68e78f9a4f7e892 Mon Sep 17 00:00:00 2001
From: Eric Wasylishen <ewasylishen@gmail.com>
Date: Mon, 19 May 2014 13:00:22 -0600
Subject: [PATCH] fix handling of vsync

---
 Quake/gl_vidsdl.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/Quake/gl_vidsdl.c b/Quake/gl_vidsdl.c
index b21f3a3a..53b7e310 100644
--- a/Quake/gl_vidsdl.c
+++ b/Quake/gl_vidsdl.c
@@ -807,7 +807,13 @@ static void GL_CheckExtensions (void)
 	{
 		Con_Warning ("vertical sync not supported (SDL_GL_SetAttribute failed)\n");
 	}
-#if !defined(USE_SDL2)
+#if defined(USE_SDL2)
+	else if ((swap_control = SDL_GL_GetSwapInterval()) == -1)
+	{
+		gl_swap_control = false;
+		Con_Warning ("vertical sync not supported (SDL_GL_GetSwapInterval failed)\n");
+	}
+#else
 	else if (SDL_GL_GetAttribute(SDL_GL_SWAP_CONTROL, &swap_control) == -1)
 	{
 		gl_swap_control = false;