glIsFramebuffer — determine if a name corresponds to a framebuffer object
framebuffer is currently the name of a framebuffer
framebuffer is zero, or if
framebuffer is not the name of a framebuffer object, or if an error
framebuffer is a name returned by
glGenFramebuffers, by that has not yet been bound through a call to
glBindFramebuffer, then the name is not a framebuffer object and
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