Determine if a name corresponds to a framebuffer object.
||-||Specifies a value that may be the name of a framebuffer object.|
framebuffer is currently the name of a framebuffer object. If
framebuffer is zero, or if
framebuffer is not the name of a framebuffer object, or if an error occurs,
GL_FALSE . If
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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