Dynamically load glGetString(), to avoid direct dependency on OpenGL.

libsdl-org · Mar 2, 2014 · bafa4c7 · bafa4c7
1 parent 7393620
commit bafa4c7
Showing 1 changed file with 9 additions and 1 deletion.
diff --git a/src/video/cocoa/SDL_cocoaopengl.m b/src/video/cocoa/SDL_cocoaopengl.m
@@ -162,6 +162,7 @@ - (void)setWindow:(SDL_Window *)newWindow
 Cocoa_GL_CreateContext(_THIS, SDL_Window * window)
 {
     SDL_VideoData *data = (SDL_VideoData *) _this->driverdata;
+    const GLubyte *(APIENTRY * glGetStringFunc)(GLenum) = NULL;
     NSAutoreleasePool *pool;
     SDL_VideoDisplay *display = SDL_GetDisplayForWindow(window);
     SDL_DisplayData *displaydata = (SDL_DisplayData *)display->driverdata;
@@ -275,7 +276,14 @@ - (void)setWindow:(SDL_Window *)newWindow
         return NULL;
     }
 
-    glversion = (const char *)glGetString(GL_VERSION);
+    glGetStringFunc = (const GLubyte *(APIENTRY *)(GLenum)) SDL_GL_GetProcAddress("glGetString");
+    if (!glGetStringFunc) {
+        Cocoa_GL_DeleteContext(_this, context);
+        SDL_SetError ("Failed getting OpenGL glGetString entry point");
+        return NULL;
+    }
+
+    glversion = (const char *)glGetStringFunc(GL_VERSION);
     if (glversion == NULL) {
         Cocoa_GL_DeleteContext(_this, context);
         SDL_SetError ("Failed getting OpenGL context version");