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softgpu: Handle inf-end + negative constant slope.

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Unknown W. Brackets 2022-12-02 10:20:30 -08:00
parent 38de2f11af
commit 1121a6fb68
1 changed files with 6 additions and 2 deletions
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8
GPU/Software/TransformUnit.cpp
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@ -304,9 +304,13 @@ void ComputeTransformState(TransformState *state, const VertexReader &vreader) {
// The PSP treats these exponents as if they were valid.
if (my_isnanorinf(fogEnd)) {
bool sign = std::signbit(fogEnd);
// The multiply would reverse it.
if (my_isnanorinf(fogSlope) && std::signbit(fogSlope))
// The multiply would reverse it if it wasn't infinity (doesn't matter if it's infnan.)
if (std::signbit(fogSlope))
sign = !sign;
// Also allow a multiply by zero (slope) to result in zero, regardless of sign.
// Act like it was negative and clamped to zero.
if (fogSlope == 0.0f)
sign = true;
// Since this is constant for the entire draw, we don't even use infinity.
float forced = sign ? 0.0f : 1.0f;