glIsShader — determine if a name corresponds to a shader object
shader is the name of a shader object previously created with glCreateShader and not yet deleted with glDeleteShader. If
shader is 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
shader is 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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