Stephan Unverwerth b54573739c LibGL: Implement glTexEnvf ...

This controls how fetched texels are combined with the color that was
produced by a preceding texture unit or with the vertex color if it is
the first texture unit.

Currently only a small subset of possible combine modes is implemented
as required by glquake.

2021-08-26 19:54:31 +02:00

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