From eac41801dac087d15ddfe60921262df768fc1686 Mon Sep 17 00:00:00 2001
From: Sam Lantinga <slouken@libsdl.org>
Date: Sun, 6 Feb 2011 10:24:08 -0800
Subject: [PATCH] At least allow returning the values that were set.

---
 src/video/SDL_video.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/src/video/SDL_video.c b/src/video/SDL_video.c
index 147c82a30..7b146d089 100644
--- a/src/video/SDL_video.c
+++ b/src/video/SDL_video.c
@@ -2163,6 +2163,21 @@ SDL_GL_GetAttribute(SDL_GLattr attr, int *value)
             *value = (_this->gl_config.accelerated != 0);
             return 0;
         }
+    case SDL_GL_RETAINED_BACKING:
+        {
+            *value = _this->gl_config.retained_backing;
+            return 0;
+        }
+    case SDL_GL_CONTEXT_MAJOR_VERSION:
+        {
+            *value = _this->gl_config.major_version;
+            return 0;
+        }
+    case SDL_GL_CONTEXT_MINOR_VERSION:
+        {
+            *value = _this->gl_config.minor_version;
+            return 0;
+        }
     default:
         SDL_SetError("Unknown OpenGL attribute");
         return -1;