Jelle Raaijmakers 62f4486190 LibSoftGPU: Only enable texture stages if required ...

Copying over every texel (4x`f32x4`) for every texture unit is
relatively expensive. By checking if we even need to remember these
texel values, we reduce the time spent in `rasterize_triangle` by
around 2% as measured in Quake III.

2023-02-02 14:38:26 +01:00

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