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// This code contains NVIDIA Confidential Information and is disclosed to you
// under a form of NVIDIA software license agreement provided separately to you.
//
// Notice
// NVIDIA Corporation and its licensors retain all intellectual property and
// proprietary rights in and to this software and related documentation and
// any modifications thereto. Any use, reproduction, disclosure, or
// distribution of this software and related documentation without an express
// license agreement from NVIDIA Corporation is strictly prohibited.
//
// ALL NVIDIA DESIGN SPECIFICATIONS, CODE ARE PROVIDED "AS IS.". NVIDIA MAKES
// NO WARRANTIES, EXPRESSED, IMPLIED, STATUTORY, OR OTHERWISE WITH RESPECT TO
// THE MATERIALS, AND EXPRESSLY DISCLAIMS ALL IMPLIED WARRANTIES OF NONINFRINGEMENT,
// MERCHANTABILITY, AND FITNESS FOR A PARTICULAR PURPOSE.
//
// Information and code furnished is believed to be accurate and reliable.
// However, NVIDIA Corporation assumes no responsibility for the consequences of use of such
// information or for any infringement of patents or other rights of third parties that may
// result from its use. No license is granted by implication or otherwise under any patent
// or patent rights of NVIDIA Corporation. Details are subject to change without notice.
// This code supersedes and replaces all information previously supplied.
// NVIDIA Corporation products are not authorized for use as critical
// components in life support devices or systems without express written approval of
// NVIDIA Corporation.
//
// 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.
#include "PtSpatialHashHelper.h"
#if PX_USE_PARTICLE_SYSTEM_API
#include "PtSpatialHash.h"
#include "PtParticle.h"
#include "PsUtilities.h"
/*!
Builds local hash and reorders particle index table.
*/
void physx::Pt::SpatialHash::buildLocalHash(const Particle* particles, PxU32 numParticles, ParticleCell* cells,
PxU32* particleIndices, PxU16* hashKeyArray, PxU32 numHashBuckets,
PxF32 cellSizeInv, const PxVec3& packetCorner)
{
PX_ASSERT(particles);
PX_ASSERT(cells);
PX_ASSERT(particleIndices);
PX_ASSERT(numHashBuckets > numParticles); // Needs to be larger to have at least one empty hash bucket (required to
// detect invalid cells).
// Mark packet cell entries as empty.
for(PxU32 c = 0; c < numHashBuckets; c++)
cells[c].numParticles = PX_INVALID_U32;
PX_ALIGN(16, Particle fakeParticle);
fakeParticle.position = PxVec3(FLT_MAX, FLT_MAX, FLT_MAX);
PxU32 numParticles4 = ((numParticles + 3) & ~0x3) + 4; // ceil up to multiple of four + 4 for save unrolling
// Add particles to cell hash
const Particle* prt0 = particles;
const Particle* prt1 = (1 < numParticles) ? particles + 1 : &fakeParticle;
const Particle* prt2 = (2 < numParticles) ? particles + 2 : &fakeParticle;
const Particle* prt3 = (3 < numParticles) ? particles + 3 : &fakeParticle;
struct Int32Vec3
{
PX_FORCE_INLINE void set(const PxVec3& realVec, const PxF32 scale)
{
x = static_cast<PxI32>(Ps::floor(realVec.x * scale));
y = static_cast<PxI32>(Ps::floor(realVec.y * scale));
z = static_cast<PxI32>(Ps::floor(realVec.z * scale));
}
PxI32 x;
PxI32 y;
PxI32 z;
};
PX_ALIGN(16, Int32Vec3 cellCoords[8]);
cellCoords[0].set(prt0->position - packetCorner, cellSizeInv);
cellCoords[1].set(prt1->position - packetCorner, cellSizeInv);
cellCoords[2].set(prt2->position - packetCorner, cellSizeInv);
cellCoords[3].set(prt3->position - packetCorner, cellSizeInv);
for(PxU32 p = 0; p < numParticles4; p += 4)
{
const Particle* prt0_N = (p + 4 < numParticles) ? particles + p + 4 : &fakeParticle;
const Particle* prt1_N = (p + 5 < numParticles) ? particles + p + 5 : &fakeParticle;
const Particle* prt2_N = (p + 6 < numParticles) ? particles + p + 6 : &fakeParticle;
const Particle* prt3_N = (p + 7 < numParticles) ? particles + p + 7 : &fakeParticle;
PxU32 wIndex = (p + 4) & 7;
cellCoords[wIndex].set(prt0_N->position - packetCorner, cellSizeInv);
cellCoords[wIndex + 1].set(prt1_N->position - packetCorner, cellSizeInv);
cellCoords[wIndex + 2].set(prt2_N->position - packetCorner, cellSizeInv);
cellCoords[wIndex + 3].set(prt3_N->position - packetCorner, cellSizeInv);
PxU32 rIndex = p & 7;
for(PxU32 i = 0; i < 4; ++i)
{
if(p + i < numParticles)
{
const Int32Vec3& int32Vec3 = cellCoords[rIndex + i];
const GridCellVector cellCoord(PxI16(int32Vec3.x), PxI16(int32Vec3.y), PxI16(int32Vec3.z));
PxU32 hashKey = getCellIndex(cellCoord, cells, numHashBuckets);
PX_ASSERT(hashKey < PT_PARTICLE_SYSTEM_HASH_KEY_LIMIT);
ParticleCell* cell = &cells[hashKey];
hashKeyArray[p + i] = Ps::to16(hashKey);
PX_ASSERT(cell);
if(cell->numParticles == PX_INVALID_U32)
{
// Entry is empty -> Initialize new entry
cell->coords = cellCoord;
cell->numParticles = 1; // this avoids some LHS
}
else
{
cell->numParticles++; // this avoids some LHS
}
PX_ASSERT(cell->numParticles != PX_INVALID_U32);
}
}
}
// Set for each cell the starting index of the associated particle index interval.
PxU32 cellFirstParticle = 0;
for(PxU32 c = 0; c < numHashBuckets; c++)
{
ParticleCell& cell = cells[c];
if(cell.numParticles == PX_INVALID_U32)
continue;
cell.firstParticle = cellFirstParticle;
cellFirstParticle += cell.numParticles;
}
reorderParticleIndicesToCells(particles, numParticles, cells, particleIndices, numHashBuckets, hashKeyArray);
}
/*!
Reorders particle indices to cells.
*/
void physx::Pt::SpatialHash::reorderParticleIndicesToCells(const Particle* /*particles*/, PxU32 numParticles,
ParticleCell* cells, PxU32* particleIndices,
PxU32 numHashBuckets, PxU16* hashKeyArray)
{
for(PxU32 c = 0; c < numHashBuckets; c++)
{
ParticleCell& cell = cells[c];
if(cell.numParticles == PX_INVALID_U32)
continue;
cell.numParticles = 0;
}
// Reorder particle indices according to cells
for(PxU32 p = 0; p < numParticles; p++)
{
// Get cell for fluid
ParticleCell* cell;
cell = &cells[hashKeyArray[p]];
PX_ASSERT(cell);
PX_ASSERT(cell->numParticles != PX_INVALID_U32);
particleIndices[cell->firstParticle + cell->numParticles] = p;
cell->numParticles++;
}
}
#endif // PX_USE_PARTICLE_SYSTEM_API
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