exporting patch:
# HG changeset patch
# User Martin Schreiber <schreiberx@gmail.com>
# Date 1316036100 -7200
# Node ID 70b9ab1db85ab6926b55936ed24146a6e15c7067
# Parent  4fc2f7e2bb52b5e65221e831de22dff1d3d9ef0d
OpenGL core mode initialization updated: otherwise a core mode context is never created.

This error can be reproduced by printing SDL_GetError() after trying to create a core mode window.

diff -r 4fc2f7e2bb52 -r 70b9ab1db85a src/video/x11/SDL_x11opengl.c
--- a/src/video/x11/SDL_x11opengl.c	Sat Sep 10 19:27:39 2011 +0300
+++ b/src/video/x11/SDL_x11opengl.c	Wed Sep 14 23:35:00 2011 +0200
@@ -382,6 +382,96 @@
     return i;
 }
 
+
+int 
+X11_GL_GetFBAttributes(_THIS, Display * display, int screen, int * attribs, int size)
+{
+    int i = 0;
+
+    /* assert buffer is large enough to hold all SDL attributes. */ 
+    /* assert(size >= 32);*/
+
+    /* Setup our GLX attributes according to the gl_config. */
+    attribs[i++] = GLX_RENDER_TYPE;
+    attribs[i++] = GLX_RGBA_BIT;
+    attribs[i++] = GLX_RED_SIZE;
+    attribs[i++] = _this->gl_config.red_size;
+    attribs[i++] = GLX_GREEN_SIZE;
+    attribs[i++] = _this->gl_config.green_size;
+    attribs[i++] = GLX_BLUE_SIZE;
+    attribs[i++] = _this->gl_config.blue_size;
+
+    if (_this->gl_config.alpha_size) {
+        attribs[i++] = GLX_ALPHA_SIZE;
+        attribs[i++] = _this->gl_config.alpha_size;
+    }
+
+    if (_this->gl_config.buffer_size) {
+        attribs[i++] = GLX_BUFFER_SIZE;
+        attribs[i++] = _this->gl_config.buffer_size;
+    }
+
+    if (_this->gl_config.double_buffer) {
+        attribs[i++] = GLX_DOUBLEBUFFER;
+        attribs[i++] = True;
+    }
+
+    attribs[i++] = GLX_DEPTH_SIZE;
+    attribs[i++] = _this->gl_config.depth_size;
+
+    if (_this->gl_config.stencil_size) {
+        attribs[i++] = GLX_STENCIL_SIZE;
+        attribs[i++] = _this->gl_config.stencil_size;
+    }
+
+    if (_this->gl_config.accum_red_size) {
+        attribs[i++] = GLX_ACCUM_RED_SIZE;
+        attribs[i++] = _this->gl_config.accum_red_size;
+    }
+
+    if (_this->gl_config.accum_green_size) {
+        attribs[i++] = GLX_ACCUM_GREEN_SIZE;
+        attribs[i++] = _this->gl_config.accum_green_size;
+    }
+
+    if (_this->gl_config.accum_blue_size) {
+        attribs[i++] = GLX_ACCUM_BLUE_SIZE;
+        attribs[i++] = _this->gl_config.accum_blue_size;
+    }
+
+    if (_this->gl_config.accum_alpha_size) {
+        attribs[i++] = GLX_ACCUM_ALPHA_SIZE;
+        attribs[i++] = _this->gl_config.accum_alpha_size;
+    }
+
+    if (_this->gl_config.stereo) {
+        attribs[i++] = GLX_STEREO;
+        attribs[i++] = True;
+    }
+
+    if (_this->gl_config.multisamplebuffers) {
+        attribs[i++] = GLX_SAMPLE_BUFFERS_ARB;
+        attribs[i++] = _this->gl_config.multisamplebuffers;
+    }
+
+    if (_this->gl_config.multisamplesamples) {
+        attribs[i++] = GLX_SAMPLES_ARB;
+        attribs[i++] = _this->gl_config.multisamplesamples;
+    }
+
+    if (_this->gl_config.accelerated >= 0 &&
+        _this->gl_data->HAS_GLX_EXT_visual_rating) {
+        attribs[i++] = GLX_VISUAL_CAVEAT_EXT;
+        attribs[i++] = _this->gl_config.accelerated ? GLX_NONE_EXT :
+                                                      GLX_SLOW_VISUAL_EXT;
+    }
+
+    attribs[i++] = None;
+ 
+    return i;
+}
+
+
 XVisualInfo *
 X11_GL_GetVisual(_THIS, Display * display, int screen)
 {
@@ -462,7 +552,7 @@
                              int *)) _this->gl_data->
                         glXGetProcAddress((GLubyte *) "glXChooseFBConfig");
 
-                    X11_GL_GetAttributes(_this,display,screen,glxAttribs,64);
+                    X11_GL_GetFBAttributes(_this,display,screen,glxAttribs,64);
 
                     if (!glXChooseFBConfig
                         || !(framebuffer_config =