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Cycles: improve triangle intersection performance. 

Reduces render time by about 1-2% in benchmark scenes.

Differential Revision: https://developer.blender.org/D2911
This commit is contained in:
Maxym Dmytrychenko 2017-11-29 02:02:17 +01:00 committed by Brecht Van Lommel
parent 4b4702ab8a
commit 7e349f2745
1 changed files with 18 additions and 12 deletions
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30
intern/cycles/util/util_math_intersect.h
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@ -117,38 +117,44 @@ bool ray_triangle_intersect(
const float3 e2 = v1 - v2;
/* Perform edge tests. */
#ifdef __KERNEL_SSE2__
#if defined(__KERNEL_SSE2__) && defined (__KERNEL_SSE__)
const float3 crossU = cross(v2 + v0, e0);
const float3 crossV = cross(v0 + v1, e1);
const float3 crossW = cross(v1 + v2, e2);
# ifndef __KERNEL_SSE__
const ssef crossX(crossU.x, crossV.x, crossW.x, crossW.x);
const ssef crossY(crossU.y, crossV.y, crossW.y, crossW.y);
const ssef crossZ(crossU.z, crossV.z, crossW.z, crossW.z);
# else
ssef crossX(crossU);
ssef crossY(crossV);
ssef crossZ(crossW);
ssef zero = _mm_setzero_ps();
_MM_TRANSPOSE4_PS(crossX, crossY, crossZ, zero);
# endif
const ssef dirX(ray_dir.x);
const ssef dirY(ray_dir.y);
const ssef dirZ(ray_dir.z);
/*const*/ ssef UVWW = crossX*dirX + crossY*dirY + crossZ*dirZ;
const float minUVW = reduce_min(UVWW);
const float maxUVW = reduce_max(UVWW);
ssef UVWW = madd(crossX, dirX, madd(crossY, dirY, crossZ * dirZ));
#else /* __KERNEL_SSE2__ */
const float U = dot(cross(v2 + v0, e0), ray_dir);
const float V = dot(cross(v0 + v1, e1), ray_dir);
const float W = dot(cross(v1 + v2, e2), ray_dir);
#endif /* __KERNEL_SSE2__ */
#if defined(__KERNEL_SSE2__) && defined (__KERNEL_SSE__)
int uvw_sign = movemask(UVWW) & 0x7;
if (uvw_sign != 0)
{
if (uvw_sign != 0x7)
return false;
}
#else
const float minUVW = min(U, min(V, W));
const float maxUVW = max(U, max(V, W));
#endif /* __KERNEL_SSE2__ */
if(minUVW < 0.0f && maxUVW > 0.0f) {
return false;
}
#endif
/* Calculate geometry normal and denominator. */
const float3 Ng1 = cross(e1, e0);
@ -171,7 +177,7 @@ bool ray_triangle_intersect(
}
const float inv_den = 1.0f / den;
#ifdef __KERNEL_SSE2__
#if defined(__KERNEL_SSE2__) && defined (__KERNEL_SSE__)
UVWW *= inv_den;
_mm_store_ss(isect_u, UVWW);
_mm_store_ss(isect_v, shuffle<1,1,3,3>(UVWW));