+- (NSDictionary *)getGLProperties
+{
+ Bool dbuf_p = [prefsReader getBooleanResource:"doubleBuffer"];
+
+ /* There seems to be no way to actually turn off double-buffering in
+ EAGLContext (e.g., no way to draw to the front buffer directly)
+ but if we turn on "retained backing" for non-buffering apps like
+ "pipes", at least the back buffer isn't auto-cleared on them.
+ */
+
+ return [NSDictionary dictionaryWithObjectsAndKeys:
+ kEAGLColorFormatRGBA8, kEAGLDrawablePropertyColorFormat,
+ [NSNumber numberWithBool:!dbuf_p], kEAGLDrawablePropertyRetainedBacking,
+ nil];
+}
+
+- (void)addExtraRenderbuffers:(CGSize)size
+{
+ int w = size.width;
+ int h = size.height;
+
+ if (gl_depthbuffer) glDeleteRenderbuffersOES (1, &gl_depthbuffer);
+
+ glGenRenderbuffersOES (1, &gl_depthbuffer);
+ // [EAGLContext renderbufferStorage:fromDrawable:] must be called before this.
+ glBindRenderbufferOES (GL_RENDERBUFFER_OES, gl_depthbuffer);
+ glRenderbufferStorageOES (GL_RENDERBUFFER_OES, GL_DEPTH_COMPONENT16_OES,
+ w, h);
+ glFramebufferRenderbufferOES (GL_FRAMEBUFFER_OES, GL_DEPTH_ATTACHMENT_OES,
+ GL_RENDERBUFFER_OES, gl_depthbuffer);
+}
+
+- (NSString *)getCAGravity
+{
+ return kCAGravityCenter;
+}
+
+- (void) startAnimation
+{
+ [super startAnimation];
+ if (ogl_ctx) /* Almost always true. */
+ _glesState = jwzgles_make_state ();
+}
+
+- (void) stopAnimation
+{
+ [super stopAnimation];
+#ifdef USE_IPHONE
+ if (_glesState) {
+ [EAGLContext setCurrentContext:ogl_ctx];
+ jwzgles_make_current (_glesState);
+ jwzgles_free_state ();