Determine if a name corresponds to a program pipeline object.
||-||Specifies a value that may be the name of a program pipeline object.|
pipeline is currently the name of a program pipeline object. If
pipeline is zero, or if
pipeline is not the name of a program pipeline object, or if an error occurs,
pipeline is a name returned by glGenProgramPipelines, but that has not yet been bound through a call to glBindProgramPipeline, then the name is not a program pipeline object and
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