Create a color renderbuffer.
Allocate its storage by calling the context’srenderbufferStorage:fromDrawable: method, passing the layer
object as the parameter. The width,height and pixel format are taken from the layer and used to allocate storage for the renderbuffer.
myEAGLLayer = (CAEAGLLayer*)self.layer;
GLuint colorRenderbuffer;
glGenRenderbuffers(1, &colorRenderbuffer);glBindRenderbuffer(GL_RENDERBUFFER, colorRenderbuffer);
[myContext renderbufferStorage:GL_RENDERBUFFER fromDrawable:myEAGLLayer];
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,GL_RENDERBUFFER, colorRenderbuffer);
Note WhentheCoreAnimationlayer’sboundsorpropertieschange,yourapplicationshouldreallocate the renderbuffer’s storage. If you do not reallocate the renderbuffers, the renderbuffersize won’t match the size of the view; in this case, Core Animation may scale the image’s contentsto fit in the view. To prevent this, the Xcode template reallocates the framebuffer and renderbufferwhenever the view layout changes.
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