# HG changeset patch
# User Sam Lantinga <slouken@libsdl.org>
# Date 1150781002 0
# Node ID 109bdfe06b3119d2cecc48318b9d95466e6ebe0a
# Parent  c553a990dc3258bf0b44b9b88e75b39925b66c82
Fixed bug #232

 ------- Comment #2 From Matthias Geissert  2006-05-24 07:54  [reply] -------
See http://dri.sourceforge.net/doc/DRIuserguide.html, section 11.5. There is written that you need to use RTLD_GLOBAL, since, otherwise, nested open of dynamic libraries doesn't work. However, This is necassary in this case, since libGL opens the hardware-specific driver/library. I hope this helps you.

diff -r c553a990dc32 -r 109bdfe06b31 src/video/x11/SDL_x11gl.c
--- a/src/video/x11/SDL_x11gl.c	Tue Jun 20 03:29:30 2006 +0000
+++ b/src/video/x11/SDL_x11gl.c	Tue Jun 20 05:23:22 2006 +0000
@@ -435,13 +435,25 @@
 
 #endif /* SDL_VIDEO_OPENGL_GLX */
 
+#define OPENGL_REQUIRS_DLOPEN
+#if defined(OPENGL_REQUIRS_DLOPEN) && defined(SDL_LOADSO_DLOPEN)
+#include <dlfcn.h>
+#define GL_LoadObject(X)	dlopen(X, (RTLD_NOW|RTLD_GLOBAL))
+#define GL_LoadFunction		dlsym
+#define GL_UnloadObject		dlclose
+#else
+#define GL_LoadObject	SDL_LoadObject
+#define GL_LoadFunction	SDL_LoadFunction
+#define GL_UnloadObject	SDL_UnloadObject
+#endif
+
 void
 X11_GL_UnloadLibrary(_THIS)
 {
 #if SDL_VIDEO_OPENGL_GLX
     if (this->gl_config.driver_loaded) {
 
-        SDL_UnloadObject(this->gl_config.dll_handle);
+        GL_UnloadObject(this->gl_config.dll_handle);
 
         this->gl_data->glXGetProcAddress = NULL;
         this->gl_data->glXChooseVisual = NULL;
@@ -479,7 +491,7 @@
         }
     }
 
-    handle = SDL_LoadObject(path);
+    handle = GL_LoadObject(path);
     if (handle == NULL) {
         /* SDL_LoadObject() will call SDL_SetError() for us. */
         return -1;
@@ -490,35 +502,35 @@
 
     /* Load new function pointers */
     this->gl_data->glXGetProcAddress =
-        (void *(*)(const GLubyte *)) SDL_LoadFunction(handle,
-                                                      "glXGetProcAddressARB");
+        (void *(*)(const GLubyte *)) GL_LoadFunction(handle,
+                                                     "glXGetProcAddressARB");
     this->gl_data->glXChooseVisual =
-        (XVisualInfo * (*)(Display *, int, int *)) SDL_LoadFunction(handle,
-                                                                    "glXChooseVisual");
+        (XVisualInfo * (*)(Display *, int, int *)) GL_LoadFunction(handle,
+                                                                   "glXChooseVisual");
     this->gl_data->glXCreateContext =
         (GLXContext(*)(Display *, XVisualInfo *, GLXContext, int))
-        SDL_LoadFunction(handle, "glXCreateContext");
+        GL_LoadFunction(handle, "glXCreateContext");
     this->gl_data->glXDestroyContext =
-        (void (*)(Display *, GLXContext)) SDL_LoadFunction(handle,
-                                                           "glXDestroyContext");
+        (void (*)(Display *, GLXContext)) GL_LoadFunction(handle,
+                                                          "glXDestroyContext");
     this->gl_data->glXMakeCurrent =
-        (int (*)(Display *, GLXDrawable, GLXContext))
-        SDL_LoadFunction(handle, "glXMakeCurrent");
+        (int (*)(Display *, GLXDrawable, GLXContext)) GL_LoadFunction(handle,
+                                                                      "glXMakeCurrent");
     this->gl_data->glXSwapBuffers =
-        (void (*)(Display *, GLXDrawable)) SDL_LoadFunction(handle,
-                                                            "glXSwapBuffers");
+        (void (*)(Display *, GLXDrawable)) GL_LoadFunction(handle,
+                                                           "glXSwapBuffers");
     this->gl_data->glXGetConfig =
         (int (*)(Display *, XVisualInfo *, int, int *))
-        SDL_LoadFunction(handle, "glXGetConfig");
+        GL_LoadFunction(handle, "glXGetConfig");
     this->gl_data->glXQueryExtensionsString =
-        (const char *(*)(Display *, int)) SDL_LoadFunction(handle,
-                                                           "glXQueryExtensionsString");
+        (const char *(*)(Display *, int)) GL_LoadFunction(handle,
+                                                          "glXQueryExtensionsString");
     this->gl_data->glXSwapIntervalSGI =
-        (int (*)(int)) SDL_LoadFunction(handle, "glXSwapIntervalSGI");
+        (int (*)(int)) GL_LoadFunction(handle, "glXSwapIntervalSGI");
     this->gl_data->glXSwapIntervalMESA =
-        (GLint(*)(unsigned)) SDL_LoadFunction(handle, "glXSwapIntervalMESA");
+        (GLint(*)(unsigned)) GL_LoadFunction(handle, "glXSwapIntervalMESA");
     this->gl_data->glXGetSwapIntervalMESA =
-        (GLint(*)(void)) SDL_LoadFunction(handle, "glXGetSwapIntervalMESA");
+        (GLint(*)(void)) GL_LoadFunction(handle, "glXGetSwapIntervalMESA");
 
     if ((this->gl_data->glXChooseVisual == NULL) ||
         (this->gl_data->glXCreateContext == NULL) ||
@@ -551,8 +563,7 @@
     if (this->gl_data->glXGetProcAddress) {
         return this->gl_data->glXGetProcAddress((const GLubyte *) proc);
     }
-    return SDL_LoadFunction(handle, proc);
+    return GL_LoadFunction(handle, proc);
 }
 
 #endif /* SDL_VIDEO_OPENGL_GLX */
-/* vi: set ts=4 sw=4 expandtab: */