Multiple OpenGL Subviews?

[Rozik]

Hello everyone,

I would like to have multiple openglViews in my application. even multiple openGl subviews on one parent view.

Everything works fine with one opengl view i add but every additional view i add wont render anything. I thought i would have to create a render buffer and framebuffer per subview but somehow that doesnt help or maybe doesnt happen.

Here is some code how i create my framebuffers and render buffers in each view:

- (BOOL)createFramebuffer {   
	
    glGenFramebuffersOES(1, &viewFramebuffer);
    glGenRenderbuffersOES(1, &viewRenderbuffer);
	
	NSLog(@"FRAMEBUFFER  : %i",viewFramebuffer);
	NSLog(@"RENDERBUFFER : %i",viewRenderbuffer);
    
    glBindFramebufferOES(GL_FRAMEBUFFER_OES, viewFramebuffer);
    glBindRenderbufferOES(GL_RENDERBUFFER_OES, viewRenderbuffer);
    [context renderbufferStorage:GL_RENDERBUFFER_OES fromDrawable:(CAEAGLLayer*)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 (USE_DEPTH_BUFFER) {
        glGenRenderbuffersOES(1, &depthRenderbuffer);
        glBindRenderbufferOES(GL_RENDERBUFFER_OES, depthRenderbuffer);
        glRenderbufferStorageOES(GL_RENDERBUFFER_OES, GL_DEPTH_COMPONENT16_OES, backingWidth, backingHeight);
        glFramebufferRenderbufferOES(GL_FRAMEBUFFER_OES, GL_DEPTH_ATTACHMENT_OES, GL_RENDERBUFFER_OES, depthRenderbuffer);
    }
    
    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;
}

Weird thing is for every view i create the values logged for the framebuffer and render buffer are 1 and 1

i tried this too:

    glGenFramebuffersOES(num_ofViews, &viewFramebuffer);
    glGenRenderbuffersOES(num_ofViews, &viewRenderbuffer);

but that didn't help either :-(

If anyone had some idea for me it would be much appreciated!

I have been stuck on this for 3 days now and cant figure it out:-(

Thx a lot in advance!

Wolfgang

[chbeer]

I am sure the iPhone can't handle more than one opengl view at once. Its graphics processor is not fast enough. Can you do that on a mac?

[Rozik]

I am not sure if its possible to have more than one OpenGl subviews but it has to be possible to have more than one opengl view so you can load and unload them.

I dont want all of them animated at the same time. And if so i would run int all in one loop which should work fine.

The problem looks like the render and framebuffers get mixed up so only the first buffers i create are ever used.

Just for some more info, in my render method i set the open gl frame and render buffer to the render and frame buffer of that view. Which i thought should work but somehow all frame and renderbuffers in all views i create have the same value:-(

Thx for your response though

[Rozik]

If anyone cares for some information:

i managed to create different buffer identifiers by moving the create framebuffer from layoutSubviews to viewDidLoad.

Which is one step in the right direction i think.

But now i get GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT_OES when trying to create the framebuffer for every framebuffer but the first

[deciphermedia]

Originally Posted by Rozik

But now i get GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT_OES when trying to create the framebuffer for every framebuffer but the first

Have you called glFramebufferRenderbufferOES to attach the new renderbuffer to your frame buffer? I had a similar problem to yours and that is what fixed it.

glFramebufferRenderbufferOES(GL_FRAMEBUFFER_OES, GL_COLOR_ATTACHMENT0_OES, GL_RENDERBUFFER_OES, colorRenderbuffer);

Hope this helps someone !

[mediaspree]

Ressurecting this one from the dead, was there ever a solution to creating two opengl subviews in one view?