glIsVertexArray — determine if a name corresponds to a vertex array object
array is currently the name of a renderbuffer object. If
renderbuffer is zero, or if
array is not the name of a renderbuffer object, or if an error occurs,
array is a name returned by glGenVertexArrays, by that has not yet been bound through a call to glBindVertexArray, then the name is not a vertex array object and
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