glIsProgram — determine if a name corresponds to a program object
program is the name of a program object previously created with glCreateProgram and not yet deleted with glDeleteProgram. If
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
program is 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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