gistfile1.txt

- (void) layoutSubviews
{
    NSLog(@"Laying out subview");
    [self destroyFramebuffer];
    [self createFramebuffer];
    [EAGLContext setCurrentContext:context];
    if (needsErase) {
        [self erase];
        needsErase = NO;
    }
}

- (BOOL) createFramebuffer
{    
    glGenFramebuffersOES(1, &viewFramebuffer);
    glGenRenderbuffersOES(1, &viewRenderbuffer);
    
    glBindFramebuffer(GL_FRAMEBUFFER_OES, viewFramebuffer);
    glBindRenderbuffer(GL_RENDERBUFFER_OES, viewRenderbuffer);
    
    CAEAGLLayer *eaglLayer = (CAEAGLLayer*)self.layer;
    
    // This call associates the storage for the current render buffer with the EAGLDrawable (our CAEAGLLayer) allowing us to draw into a buffer that will later be rendered to the screen
    BOOL status = [context renderbufferStorage:GL_RENDERBUFFER_OES fromDrawable:eaglLayer];
    if (status == NO) {
        NSLog(@"Failed to allocate renderbuffer storage!");
    }
    glFramebufferRenderbufferOES(GL_FRAMEBUFFER_OES, GL_COLOR_ATTACHMENT0_OES, GL_RENDERBUFFER_OES, viewRenderbuffer);
    
    glGetRenderbufferParameterivOES(GL_RENDERBUFFER_OES, GL_RENDERBUFFER_WIDTH_OES, &backingWidth);
    glGetRenderbufferParameterivOES(GL_RENDERBUFFER_OES, GL_RENDERBUFFER_HEIGHT_OES, &backingHeight);
    
    // NSLog(@"Backing Width: %d Height: %d", backingWidth, backingHeight);
    
    if (glCheckFramebufferStatus(GL_FRAMEBUFFER_OES) != GL_FRAMEBUFFER_COMPLETE_OES) {
        NSLog(@"Failed to make a complete framebuffer object %x", glCheckFramebufferStatus(GL_FRAMEBUFFER_OES));
        return NO;
    }
    return YES;
}