Jelle Raaijmakers 4e3ed16527 LibGL: Only pass bound texture units to rasterizer ...

Before, `SoftwareRasterizer` was iterating over all 32 possible texture
units for each fragment and checking each if they're bound to a texture.

After this change, an intrusive list containing only texture units with
bound textures is passed to the rasterizer. In GLQuake, this results in
a performance improvement of ~30% (from 12 to 16 FPS in the first demo)
on my machine.

2021-12-20 10:36:53 -08:00

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