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-rw-r--r--src/gallium/drivers/swr/rasterizer/core/backend_impl.h4
-rw-r--r--src/gallium/drivers/swr/rasterizer/core/binner.cpp17
2 files changed, 17 insertions, 4 deletions
diff --git a/src/gallium/drivers/swr/rasterizer/core/backend_impl.h b/src/gallium/drivers/swr/rasterizer/core/backend_impl.h
index 454f473b47e..2cfd52e829d 100644
--- a/src/gallium/drivers/swr/rasterizer/core/backend_impl.h
+++ b/src/gallium/drivers/swr/rasterizer/core/backend_impl.h
@@ -62,10 +62,8 @@ static INLINE simdmask ComputeUserClipMask(uint8_t clipMask, float* pUserClipBuf
simdscalar vB = _simd_broadcast_ss(pUserClipBuffer++);
simdscalar vC = _simd_broadcast_ss(pUserClipBuffer++);
- simdscalar vK = _simd_sub_ps(_simd_sub_ps(_simd_set1_ps(1.0f), vI), vJ);
-
// interpolate
- simdscalar vInterp = vplaneps(vA, vB, _simd_mul_ps(vK, vC), vI, vJ);
+ simdscalar vInterp = vplaneps(vA, vB, vC, vI, vJ);
// clip if interpolated clip distance is < 0 || NAN
simdscalar vCull = _simd_cmp_ps(_simd_setzero_ps(), vInterp, _CMP_NLE_UQ);
diff --git a/src/gallium/drivers/swr/rasterizer/core/binner.cpp b/src/gallium/drivers/swr/rasterizer/core/binner.cpp
index 3b093cefc04..c9a37cb17ae 100644
--- a/src/gallium/drivers/swr/rasterizer/core/binner.cpp
+++ b/src/gallium/drivers/swr/rasterizer/core/binner.cpp
@@ -256,12 +256,27 @@ void ProcessUserClipDist(const SWR_BACKEND_STATE& state, PA_STATE& pa, uint32_t
simd4scalar primClipDist[3];
pa.AssembleSingle(clipAttribSlot, primIndex, primClipDist);
+ float vertClipDist[NumVerts];
for (uint32_t e = 0; e < NumVerts; ++e)
{
OSALIGNSIMD(float) aVertClipDist[4];
SIMD128::store_ps(aVertClipDist, primClipDist[e]);
- *(pUserClipBuffer++) = aVertClipDist[clipComp];
+ vertClipDist[e] = aVertClipDist[clipComp];
};
+
+ // setup plane equations for barycentric interpolation in the backend
+ float baryCoeff[NumVerts];
+ float last = vertClipDist[NumVerts - 1] * pRecipW[NumVerts - 1];
+ for (uint32_t e = 0; e < NumVerts - 1; ++e)
+ {
+ baryCoeff[e] = vertClipDist[e] * pRecipW[e] - last;
+ }
+ baryCoeff[NumVerts - 1] = last;
+
+ for (uint32_t e = 0; e < NumVerts; ++e)
+ {
+ *(pUserClipBuffer++) = baryCoeff[e];
+ }
}
}