From 1dcdf6651f07313586fc89bacedf7015ff1f3e29 Mon Sep 17 00:00:00 2001
From: Sam Lantinga <slouken@libsdl.org>
Date: Wed, 31 Jul 2013 21:22:09 -0700
Subject: [PATCH] Documented why we have global and thread-local variables for
 the GL context.

---
 src/video/SDL_sysvideo.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/video/SDL_sysvideo.h b/src/video/SDL_sysvideo.h
index 598782833..4973648c7 100644
--- a/src/video/SDL_sysvideo.h
+++ b/src/video/SDL_sysvideo.h
@@ -301,6 +301,9 @@ struct SDL_VideoDevice
 
     /* * * */
     /* Cache current GL context; don't call the OS when it hasn't changed. */
+    /* We have the global pointers here so Cocoa continues to work the way
+       it always has, and the thread-local storage for the general case.
+     */
     SDL_Window *current_glwin;
     SDL_GLContext current_glctx;
     SDL_TLSID current_glwin_tls;