Apple's GLSprite OpenGL ES Sample App

Nibbie

Posts: 2
Joined: 2009.04

Post: #1

Apr 7, 2009 — 06:34 PM

I am going through Apple's GLSprite OpenGL ES sample app attempting to figure out how the code works.

In EAGLView.m there is method createFrameBuffer:

Code:

- (BOOL)createFramebuffer

{

    glGenFramebuffersOES(1, &viewFramebuffer);

    glGenRenderbuffersOES(1, &viewRenderbuffer);

    glBindFramebufferOES(GL_FRAMEBUFFER_OES, viewFramebuffer);

    glBindRenderbufferOES(GL_RENDERBUFFER_OES, viewRenderbuffer);

    [context renderbufferStorage:GL_RENDERBUFFER_OES fromDrawable:(id<EAGLDrawable>)self.layer];

    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);

    if(glCheckFramebufferStatusOES(GL_FRAMEBUFFER_OES) != GL_FRAMEBUFFER_COMPLETE_OES) {

        NSLog(@"failed to make complete framebuffer object %x", glCheckFramebufferStatusOES(GL_FRAMEBUFFER_OES));

        return NO;

    }

    return YES;

}

What do the procedure calls glGenFramebuffersOES and glGenRenderbuffersOES do?

I see they are in Apple's OpenGL ES framework (OpenGLES.framework/Headers/ES1/gl.h), but I can't find either in Apple's documentation under Xcode, on their Developer site or in the man pages on khronos.org, which makes it difficult figuring out how the code works.

OptimisticMonkey

Member

Posts: 86
Joined: 2008.04

Post: #2

Apr 8, 2009 — 06:06 AM

http://www.khronos.org/registry/gles/ext...object.txt

shusseina

Nibbie

Posts: 2
Joined: 2009.04

Post: #3

Apr 9, 2009 — 04:50 PM

Cool, thanks!

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