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softgpu: Improve Z interpolation SIMD.

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Unknown W. Brackets 2023-06-24 22:17:11 -07:00
parent b2b61d58d4
commit d42642edd2
1 changed files with 5 additions and 1 deletions
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6
GPU/Software/Rasterizer.cpp
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@ -927,6 +927,10 @@ void DrawTriangleSlice(
const Vec3<int> v1_c1 = Vec3<int>::FromRGB(v1.color1);
const Vec3<int> v2_c1 = Vec3<int>::FromRGB(v2.color1);
const Vec4<float> v0_z4 = Vec4<int>::AssignToAll(v0.screenpos.z).Cast<float>();
const Vec4<float> v1_z4 = Vec4<int>::AssignToAll(v1.screenpos.z).Cast<float>();
const Vec4<float> v2_z4 = Vec4<int>::AssignToAll(v2.screenpos.z).Cast<float>();
for (int64_t curY = minY; curY <= maxY; curY += SCREEN_SCALE_FACTOR * 2,
w0_base = e0.StepY(w0_base),
w1_base = e1.StepY(w1_base),
@ -970,7 +974,7 @@ void DrawTriangleSlice(
z = Vec4<int>::AssignToAll(v2.screenpos.z);
} else {
// Z is interpolated pretty much directly.
Vec4<float> zfloats = w0.Cast<float>() * v0.screenpos.z + w1.Cast<float>() * v1.screenpos.z + w2.Cast<float>() * v2.screenpos.z;
Vec4<float> zfloats = w0.Cast<float>() * v0_z4 + w1.Cast<float>() * v1_z4 + w2.Cast<float>() * v2_z4;
z = (zfloats * wsum_recip).Cast<int>();
}