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Software: Adjust diagonal LOD implementation

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This produces behavior matching the behavior on hardware (see Wario's Gold Mine in Mario Kart Wii).
This commit is contained in:
Pokechu22 2021-07-27 20:20:39 -07:00
parent 51e3334526
commit b9288212a0
1 changed files with 14 additions and 11 deletions
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25
Source/Core/VideoBackends/Software/Rasterizer.cpp
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@ -171,22 +171,25 @@ static inline void CalculateLOD(s32* lodp, bool* linear, u32 texmap, u32 texcoor
const TexMode1& tm1 = texUnit.texMode1; const TexMode1& tm1 = texUnit.texMode1;
float sDelta, tDelta; float sDelta, tDelta;
float* uv00 = rasterBlock.Pixel[0][0].Uv[texcoord];
float* uv10 = rasterBlock.Pixel[1][0].Uv[texcoord];
float* uv01 = rasterBlock.Pixel[0][1].Uv[texcoord];
float dudx = fabsf(uv00[0] - uv10[0]);
float dvdx = fabsf(uv00[1] - uv10[1]);
float dudy = fabsf(uv00[0] - uv01[0]);
float dvdy = fabsf(uv00[1] - uv01[1]);
if (tm0.diag_lod == LODType::Diagonal) if (tm0.diag_lod == LODType::Diagonal)
{ {
float* uv0 = rasterBlock.Pixel[0][0].Uv[texcoord]; sDelta = dudx + dudy;
float* uv1 = rasterBlock.Pixel[1][1].Uv[texcoord]; tDelta = dvdx + dvdy;
sDelta = fabsf(uv0[0] - uv1[0]);
tDelta = fabsf(uv0[1] - uv1[1]);
} }
else else
{ {
float* uv0 = rasterBlock.Pixel[0][0].Uv[texcoord]; sDelta = std::max(dudx, dudy);
float* uv1 = rasterBlock.Pixel[1][0].Uv[texcoord]; tDelta = std::max(dvdx, dvdy);
float* uv2 = rasterBlock.Pixel[0][1].Uv[texcoord];
sDelta = std::max(fabsf(uv0[0] - uv1[0]), fabsf(uv0[0] - uv2[0]));
tDelta = std::max(fabsf(uv0[1] - uv1[1]), fabsf(uv0[1] - uv2[1]));
} }
// get LOD in s28.4 // get LOD in s28.4