glGenLists has one argument, range. It returns an integer such that range contiguous empty display lists, named n, n + 1,..., n + range - 1, are created. If range is 0, if there is no group of range contiguous names available, or if any error is generated, no display lists are generated, and 0 is returned.
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glGenLists: man2/glGenLists.xml
glGenLists has one argument, range. It returns an integer such that range contiguous empty display lists, named n, n + 1,..., n + range - 1, are created. If range is 0, if there is no group of range contiguous names available, or if any error is generated, no display lists are generated, and 0 is returned.