glIsShader — determine if a name corresponds to a shader object
the name of a shader object previously created with
and not yet deleted with glDeleteShader.
zero or a non-zero value that is not the name of a shader
object, or if an error occurs,
No error is generated if
not a valid shader object name.
A shader object marked for deletion with glDeleteShader
but still attached to a program object is still considered
a shader object and
glIsShader will return
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