Jelle Raaijmakers e1c863d99a LibSoftGPU: Use non-normalized light vector for attenuation ...

There were some issues with the old code: we were saving the length of
the light vector but not actually using it anywhere, if we were dealing
with a zero-vector this could potentially divide by zero resulting in a
black fragment color, and we were erroneously using P2's length instead
of P1's length when P1's W coordinate is zero in the SGI arrow
operation.

This fixes some lighting bugs in Grim Fandango, but this probably
affects all lighting as well.

2022-03-05 21:23:56 +01:00

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