Quartz driver OpenGL updates:

Driver can now open whatever library is specified in SDL_GL_LoadLibrary()
 call (previously, it ignored this parameter), and uses the default system
 library when NULL is specified.

Also, library is loaded once in SDL_GL_LoadLibrary() and not every call to
 SDL_GL_GetProcAddress().

--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%401184

src/video/quartz/SDL_QuartzGL.m

@@ -168,32 +168,61 @@ void QZ_TearDownOpenGL (_THIS) {
 /* SDL OpenGL functions */
 
 int    QZ_GL_LoadLibrary    (_THIS, const char *location) {
-    this->gl_config.driver_loaded = 1;
-    return 0;
-}
+    CFURLRef bundleURL;
+    CFStringRef cfstr;
 
-void*  QZ_GL_GetProcAddress (_THIS, const char *proc) {
+    if ( gl_context != NULL ) {
+        SDL_SetError("OpenGL context already created");
+        return -1;
+    }
 
-    /* We may want to cache the bundleRef at some point */
-    CFBundleRef bundle;
-    CFURLRef bundleURL = CFURLCreateWithFileSystemPath (kCFAllocatorDefault,
-                                                        CFSTR("/System/Library/Frameworks/OpenGL.framework"), kCFURLPOSIXPathStyle, true);
+    if (opengl_bundle != NULL)
+        CFRelease(opengl_bundle);
 
-    CFStringRef functionName = CFStringCreateWithCString
-        (kCFAllocatorDefault, proc, kCFStringEncodingASCII);
+    opengl_bundle = NULL;
+    this->gl_config.driver_loaded = 0;
+
+    if (location == NULL)
+        location = "/System/Library/Frameworks/OpenGL.framework";
 
-    void *function;
+    cfstr = CFStringCreateWithCString(kCFAllocatorDefault, location,
+                                      kCFStringEncodingUTF8);
+    if (cfstr == NULL) {
+        SDL_OutOfMemory();
+        return -1;
+    }
 
-    bundle = CFBundleCreate (kCFAllocatorDefault, bundleURL);
-    assert (bundle != NULL);
+    bundleURL = CFURLCreateWithFileSystemPath (kCFAllocatorDefault,
+                        cfstr, kCFURLPOSIXPathStyle, true);
 
-    function = CFBundleGetFunctionPointerForName (bundle, functionName);
+    CFRelease(cfstr);
+
+    if (bundleURL == NULL) {
+        SDL_OutOfMemory();
+        return -1;
+    }
 
-    CFRelease ( bundleURL );
-    CFRelease ( functionName );
-    CFRelease ( bundle );
+    opengl_bundle = CFBundleCreate (kCFAllocatorDefault, bundleURL);
+
+    CFRelease(bundleURL);
+
+    if (opengl_bundle != NULL) {
+        this->gl_config.driver_loaded = 1;
+        return 0;
+    }
+
+    /* not exactly descriptive, but okay... */
+    SDL_SetError("Could not load OpenGL library");
+    return -1;
+}
+
+void*  QZ_GL_GetProcAddress (_THIS, const char *proc) {
+    CFStringRef funcName = CFStringCreateWithCString
+        (kCFAllocatorDefault, proc, kCFStringEncodingASCII);
 
-    return function;
+    void *func = CFBundleGetFunctionPointerForName(opengl_bundle, funcName);
+    CFRelease (funcName);
+    return func;
 }
 
 int    QZ_GL_GetAttribute   (_THIS, SDL_GLattr attrib, int* value) {

src/video/quartz/SDL_QuartzVideo.h

@@ -117,6 +117,7 @@ typedef struct SDL_PrivateVideoData {
     Sint16                  yuv_width, yuv_height;
     CGrafPtr                yuv_port;
 
+    CFBundleRef opengl_bundle;    /* dynamically loaded OpenGL library. */
 } SDL_PrivateVideoData;
 
 #define _THIS    SDL_VideoDevice *this
@@ -154,6 +155,7 @@ typedef struct SDL_PrivateVideoData {
 #define current_buffer (this->hidden->current_buffer)
 #define quit_thread (this->hidden->quit_thread)
 #define system_version (this->hidden->system_version)
+#define opengl_bundle (this->hidden->opengl_bundle)
 
 /* grab states - the input is in one of these states */
 enum {

src/video/quartz/SDL_QuartzVideo.m

@@ -1489,6 +1489,12 @@ static void QZ_VideoQuit (_THIS) {
     
     QZ_UnsetVideoMode (this);
     CGPaletteRelease (palette);
+
+    if (opengl_bundle) {
+        CFRelease(opengl_bundle);
+        opengl_bundle = NULL;
+    }
+    this->gl_config.driver_loaded = 0;
 }
 
 #if 0 /* Not used (apparently, it's really slow) */