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//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// * Neither the name of NVIDIA CORPORATION nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
// OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Copyright (c) 2008-2018 NVIDIA Corporation. All rights reserved.
// Copyright (c) 2004-2008 AGEIA Technologies, Inc. All rights reserved.
// Copyright (c) 2001-2004 NovodeX AG. All rights reserved.
#ifndef GU_BV4_SLABS_H
#define GU_BV4_SLABS_H
#include "PsFPU.h"
#include "GuBV4_Common.h"
#ifdef GU_BV4_USE_SLABS
// PT: contains code for tree-traversal using the swizzled format.
// PT: ray traversal based on Kay & Kajiya's slab intersection code, but using SIMD to do 4 ray-vs-AABB tests at a time.
// PT: other (ordered or unordered) traversals just process one node at a time, similar to the non-swizzled format.
#define BV4_SLABS_FIX
#define BV4_SLABS_SORT
#define PNS_BLOCK3(a, b, c, d) { \
if(code2 & (1<<a)) { stack[nb++] = tn->getChildData(a); } \
if(code2 & (1<<b)) { stack[nb++] = tn->getChildData(b); } \
if(code2 & (1<<c)) { stack[nb++] = tn->getChildData(c); } \
if(code2 & (1<<d)) { stack[nb++] = tn->getChildData(d); } } \
#ifdef GU_BV4_QUANTIZED_TREE
#define OPC_SLABS_GET_MIN_MAX(i) \
const __m128i minVi = _mm_set_epi32(0, node->mZ[i].mMin, node->mY[i].mMin, node->mX[i].mMin); \
const Vec4V minCoeffV = V4LoadA_Safe(¶ms->mCenterOrMinCoeff_PaddedAligned.x); \
Vec4V minV = V4Mul(_mm_cvtepi32_ps(minVi), minCoeffV); \
const __m128i maxVi = _mm_set_epi32(0, node->mZ[i].mMax, node->mY[i].mMax, node->mX[i].mMax); \
const Vec4V maxCoeffV = V4LoadA_Safe(¶ms->mExtentsOrMaxCoeff_PaddedAligned.x); \
Vec4V maxV = V4Mul(_mm_cvtepi32_ps(maxVi), maxCoeffV); \
#define OPC_SLABS_GET_CE(i) \
OPC_SLABS_GET_MIN_MAX(i) \
const FloatV HalfV = FLoad(0.5f); \
const Vec4V centerV = V4Scale(V4Add(maxV, minV), HalfV); \
const Vec4V extentsV = V4Scale(V4Sub(maxV, minV), HalfV);
#define OPC_SLABS_GET_CE2(i) \
OPC_SLABS_GET_MIN_MAX(i) \
const Vec4V centerV = V4Add(maxV, minV); \
const Vec4V extentsV = V4Sub(maxV, minV);
#else
#define OPC_SLABS_GET_CE(i) \
const FloatV HalfV = FLoad(0.5f); \
const Vec4V minV = _mm_set_ps(0.0f, node->mMinZ[i], node->mMinY[i], node->mMinX[i]); \
const Vec4V maxV = _mm_set_ps(0.0f, node->mMaxZ[i], node->mMaxY[i], node->mMaxX[i]); \
const Vec4V centerV = V4Scale(V4Add(maxV, minV), HalfV); \
const Vec4V extentsV = V4Scale(V4Sub(maxV, minV), HalfV);
#define OPC_SLABS_GET_CE2(i) \
const Vec4V minV = _mm_set_ps(0.0f, node->mMinZ[i], node->mMinY[i], node->mMinX[i]); \
const Vec4V maxV = _mm_set_ps(0.0f, node->mMaxZ[i], node->mMaxY[i], node->mMaxX[i]); \
const Vec4V centerV = V4Add(maxV, minV); \
const Vec4V extentsV = V4Sub(maxV, minV);
#endif // GU_BV4_QUANTIZED_TREE
#if PX_PS4
// PT: TODO: for some reason using the intrinsics directly produces a compile error on PS4. TODO: find a better fix.
PX_FORCE_INLINE __m128i my_mm_srai_epi32(__m128i a, int count)
{
return _mm_srai_epi32(a, count);
}
PX_FORCE_INLINE __m128i my_mm_slli_epi32(__m128i a, int count)
{
return _mm_slli_epi32(a, count);
}
#else
#define my_mm_srai_epi32 _mm_srai_epi32
#define my_mm_slli_epi32 _mm_slli_epi32
#endif
#define OPC_DEQ4(part2xV, part1xV, mMember, minCoeff, maxCoeff) \
{ \
part2xV = V4LoadA(reinterpret_cast<const float*>(tn->mMember)); \
part1xV = _mm_castsi128_ps(_mm_and_si128(_mm_castps_si128(part2xV), _mm_set1_epi32(0x0000ffff))); \
part1xV = _mm_castsi128_ps(my_mm_srai_epi32(my_mm_slli_epi32(_mm_castps_si128(part1xV), 16), 16)); \
part1xV = V4Mul(_mm_cvtepi32_ps(_mm_castps_si128(part1xV)), minCoeff); \
part2xV = _mm_castsi128_ps(my_mm_srai_epi32(_mm_castps_si128(part2xV), 16)); \
part2xV = V4Mul(_mm_cvtepi32_ps(_mm_castps_si128(part2xV)), maxCoeff); \
}
#define SLABS_INIT\
Vec4V maxT4 = V4Load(params->mStabbedFace.mDistance);\
const Vec4V rayP = V4LoadU_Safe(¶ms->mOrigin_Padded.x);\
Vec4V rayD = V4LoadU_Safe(¶ms->mLocalDir_Padded.x);\
const VecU32V raySign = V4U32and(VecU32V_ReinterpretFrom_Vec4V(rayD), signMask);\
const Vec4V rayDAbs = V4Abs(rayD);\
Vec4V rayInvD = Vec4V_ReinterpretFrom_VecU32V(V4U32or(raySign, VecU32V_ReinterpretFrom_Vec4V(V4Max(rayDAbs, epsFloat4))));\
rayD = rayInvD;\
rayInvD = V4RecipFast(rayInvD);\
rayInvD = V4Mul(rayInvD, V4NegMulSub(rayD, rayInvD, twos));\
const Vec4V rayPinvD = V4NegMulSub(rayInvD, rayP, zeroes);\
const Vec4V rayInvDsplatX = V4SplatElement<0>(rayInvD);\
const Vec4V rayInvDsplatY = V4SplatElement<1>(rayInvD);\
const Vec4V rayInvDsplatZ = V4SplatElement<2>(rayInvD);\
const Vec4V rayPinvDsplatX = V4SplatElement<0>(rayPinvD);\
const Vec4V rayPinvDsplatY = V4SplatElement<1>(rayPinvD);\
const Vec4V rayPinvDsplatZ = V4SplatElement<2>(rayPinvD);
#define SLABS_TEST\
const Vec4V tminxa0 = V4MulAdd(minx4a, rayInvDsplatX, rayPinvDsplatX);\
const Vec4V tminya0 = V4MulAdd(miny4a, rayInvDsplatY, rayPinvDsplatY);\
const Vec4V tminza0 = V4MulAdd(minz4a, rayInvDsplatZ, rayPinvDsplatZ);\
const Vec4V tmaxxa0 = V4MulAdd(maxx4a, rayInvDsplatX, rayPinvDsplatX);\
const Vec4V tmaxya0 = V4MulAdd(maxy4a, rayInvDsplatY, rayPinvDsplatY);\
const Vec4V tmaxza0 = V4MulAdd(maxz4a, rayInvDsplatZ, rayPinvDsplatZ);\
const Vec4V tminxa = V4Min(tminxa0, tmaxxa0);\
const Vec4V tmaxxa = V4Max(tminxa0, tmaxxa0);\
const Vec4V tminya = V4Min(tminya0, tmaxya0);\
const Vec4V tmaxya = V4Max(tminya0, tmaxya0);\
const Vec4V tminza = V4Min(tminza0, tmaxza0);\
const Vec4V tmaxza = V4Max(tminza0, tmaxza0);\
const Vec4V maxOfNeasa = V4Max(V4Max(tminxa, tminya), tminza);\
const Vec4V minOfFarsa = V4Min(V4Min(tmaxxa, tmaxya), tmaxza);\
#define SLABS_TEST2\
__m128 ignore4a = _mm_cmpgt_ps(epsFloat4, minOfFarsa); /* if tfar is negative, ignore since its a ray, not a line */\
ignore4a = _mm_or_ps(ignore4a, _mm_cmpgt_ps(maxOfNeasa, maxT4)); /* if tnear is over maxT, ignore this result */\
__m128 resa4 = _mm_cmpgt_ps(maxOfNeasa, minOfFarsa); /* if 1 => fail */\
resa4 = _mm_or_ps(resa4, ignore4a);\
const int code = _mm_movemask_ps(resa4);\
if(code==15)\
continue;
#define SLABS_PNS \
if(code2) \
{ \
if(tn->decodePNSNoShift(0) & dirMask) \
{ \
if(tn->decodePNSNoShift(1) & dirMask) \
{ \
if(tn->decodePNSNoShift(2) & dirMask) \
PNS_BLOCK3(3,2,1,0) \
else \
PNS_BLOCK3(2,3,1,0) \
} \
else \
{ \
if(tn->decodePNSNoShift(2) & dirMask) \
PNS_BLOCK3(3,2,0,1) \
else \
PNS_BLOCK3(2,3,0,1) \
} \
} \
else \
{ \
if(tn->decodePNSNoShift(1) & dirMask) \
{ \
if(tn->decodePNSNoShift(2) & dirMask) \
PNS_BLOCK3(1,0,3,2) \
else \
PNS_BLOCK3(1,0,2,3) \
} \
else \
{ \
if(tn->decodePNSNoShift(2) & dirMask) \
PNS_BLOCK3(0,1,3,2) \
else \
PNS_BLOCK3(0,1,2,3) \
} \
} \
}
#endif // GU_BV4_USE_SLABS
#endif // GU_BV4_SLABS_H
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