glIsProgram — determine if a name corresponds to a program object
is the name of a program object previously created with
and not yet deleted with glDeleteProgram.
program is zero or a non-zero value that
is not the name of a program object, or if an error occurs,
No error is generated if
not a valid program object name.
A program object marked for deletion with glDeleteProgram
but still in use as part of current rendering state is still considered
a program object and
glIsProgram will return
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