glIsRenderbuffer — determine if a name corresponds to a renderbuffer object
renderbuffer is currently the name of a renderbuffer object. If
renderbuffer is zero, or if
renderbuffer is not the name of a renderbuffer object, or if an error occurs,
renderbuffer is a name returned by glGenRenderbuffers, by that has not yet been bound through a call to glBindRenderbuffer or glFramebufferRenderbuffer, then the name is not a renderbuffer object and
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