What's wrong with using depth render buffer? OpenGL ES 2.0

Question

I use this code:

context = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES2];

    if (!context || ![EAGLContext setCurrentContext:context] || ![self loadShaders])
    {
        [self release];
        return nil;
    }

    glGenFramebuffers(1, &defaultFramebuffer);
    glGenRenderbuffers(1, &colorRenderbuffer);
    glGenRenderbuffers(1, &depthRenderbuffer);

    glBindFramebuffer(GL_FRAMEBUFFER, defaultFramebuffer);
    glBindRenderbuffer(GL_RENDERBUFFER, colorRenderbuffer);
    glBindRenderbuffer(GL_RENDERBUFFER, depthRenderbuffer);

    glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, colorRenderbuffer);
    glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, depthRenderbuffer);

    glClearColor(0.0f, 0.0f, 0.0f, 1.0f);

But when I'm runing the application I see purple screen? What's wrong with this code?

Answer 1

I don't see where you bind your color renderbuffer to the to the CAEAGLLayer it is to be displayed on (although that may happen later), and I don't see you enabling depth testing. Also, if I'm not mistaken you need to bind the color renderbuffer, call glFramebufferRenderbuffer() for that, then bind the depth renderbuffer and call it again.

The following is code that I've used to set up a similar display on OpenGL ES 2.0:

glEnable(GL_DEPTH_TEST);

glGenFramebuffers(1, &viewFramebuffer);
glBindFramebuffer(GL_FRAMEBUFFER, viewFramebuffer);

glGenRenderbuffers(1, &viewRenderbuffer);
glBindRenderbuffer(GL_RENDERBUFFER, viewRenderbuffer);

[context renderbufferStorage:GL_RENDERBUFFER fromDrawable:(CAEAGLLayer*)self.layer];

glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_WIDTH, &backingWidth);
glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_HEIGHT, &backingHeight);

glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, viewRenderbuffer);

glGenRenderbuffers(1, &depthRenderbuffer);
glBindRenderbuffer(GL_RENDERBUFFER, depthRenderbuffer);
glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT16, backingWidth, backingHeight);
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, depthRenderbuffer);

if(glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) 
{
    NSLog(@"Failure with framebuffer generation");
    return NO;
}

The full code of this application is available here.

Answer 2

I realize how old this is, but I did the exact same thing with the exact same results so I thought I would contribute. What had happened in my project was I hit the enter key too quickly on the auto-complete when setting up the render buffer, resulting in this:

glGenBuffers(1, &_colorRenderBuffer);

instead of this:

glGenRenderbuffers(1, &_colorRenderBuffer);

End result: purple screen.