From bfe1b1d0663e2047c0d1b88635fd57c721053eea Mon Sep 17 00:00:00 2001
From: "Ryan C. Gordon" <icculus@icculus.org>
Date: Sat, 14 Sep 2013 01:30:57 -0400
Subject: [PATCH] Don't incorrectly report success for negative swap intervals
 on Mac OS X.

---
 src/video/cocoa/SDL_cocoaopengl.m | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/video/cocoa/SDL_cocoaopengl.m b/src/video/cocoa/SDL_cocoaopengl.m
index 33d5393782185..93d0b2ad22f98 100644
--- a/src/video/cocoa/SDL_cocoaopengl.m
+++ b/src/video/cocoa/SDL_cocoaopengl.m
@@ -302,6 +302,10 @@ - (void)setWindow:(SDL_Window *)newWindow
     GLint value;
     int status;
 
+    if (interval < 0) {  /* no extension for this on Mac OS X at the moment. */
+        return SDL_SetError("Late swap tearing currently unsupported");
+    }
+
     pool = [[NSAutoreleasePool alloc] init];
 
     nscontext = (NSOpenGLContext*)SDL_GL_GetCurrentContext();