191 lines
8.3 KiB
C
191 lines
8.3 KiB
C
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions
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// are met:
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in the
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// documentation and/or other materials provided with the distribution.
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// * Neither the name of NVIDIA CORPORATION nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
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// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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// OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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// Copyright (c) 2008-2023 NVIDIA Corporation. All rights reserved.
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// Copyright (c) 2004-2008 AGEIA Technologies, Inc. All rights reserved.
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// Copyright (c) 2001-2004 NovodeX AG. All rights reserved.
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#ifndef PX_GPU_PARTICLE_SYSTEM_H
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#define PX_GPU_PARTICLE_SYSTEM_H
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/** \addtogroup physics
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@{ */
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#include "foundation/PxSimpleTypes.h"
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#include "foundation/PxVec3.h"
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#include "PxParticleSystem.h"
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#if !PX_DOXYGEN
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namespace physx
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{
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#endif
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/**
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@brief Common material properties for particles. See #PxParticleMaterial.
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Accessed by either integration or particle-rigid collisions
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*/
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struct PxsParticleMaterialData
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{
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PxReal friction; // 4
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PxReal damping; // 8
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PxReal adhesion; // 12
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PxReal gravityScale; // 16
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PxReal adhesionRadiusScale; // 20
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};
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#if !PX_DOXYGEN
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} // namespace physx
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#endif
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#if PX_SUPPORT_GPU_PHYSX
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struct float4;
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PX_CUDA_CALLABLE inline physx::PxU32 PxGetGroup(physx::PxU32 phase) { return phase & physx::PxParticlePhaseFlag::eParticlePhaseGroupMask; }
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PX_CUDA_CALLABLE inline bool PxGetFluid(physx::PxU32 phase) { return (phase & physx::PxParticlePhaseFlag::eParticlePhaseFluid) != 0; }
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PX_CUDA_CALLABLE inline bool PxGetSelfCollide(physx::PxU32 phase) { return (phase & physx::PxParticlePhaseFlag::eParticlePhaseSelfCollide) != 0; }
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PX_CUDA_CALLABLE inline bool PxGetSelfCollideFilter(physx::PxU32 phase) { return (phase & physx::PxParticlePhaseFlag::eParticlePhaseSelfCollideFilter) != 0; }
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#if !PX_DOXYGEN
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namespace physx
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{
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#endif
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/**
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@brief An iterator class to iterate over the neighbors of a particle during particle system simulation.
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*/
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class PxNeighborhoodIterator
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{
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const PxU32* PX_RESTRICT mCollisionIndex; //!< Pointer to the current state of the iterator.
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PxU32 mMaxParticles; //!< The maximum number of particles of the particle system this iterator is used on.
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public:
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PX_CUDA_CALLABLE PxNeighborhoodIterator(const PxU32* PX_RESTRICT collisionIndex, PxU32 maxParticles) :
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mCollisionIndex(collisionIndex), mMaxParticles(maxParticles)
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{
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}
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PX_CUDA_CALLABLE PxU32 getNextIndex()
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{
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PxU32 result = *mCollisionIndex;
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mCollisionIndex += mMaxParticles;
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return result;
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}
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PX_INLINE PxNeighborhoodIterator(const PxNeighborhoodIterator& params)
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{
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mCollisionIndex = params.mCollisionIndex;
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mMaxParticles = params.mMaxParticles;
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}
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PX_INLINE void operator = (const PxNeighborhoodIterator& params)
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{
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mCollisionIndex = params.mCollisionIndex;
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mMaxParticles = params.mMaxParticles;
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}
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};
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/**
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@brief Structure that holds simulation parameters of a #PxGpuParticleSystem.
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*/
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struct PxGpuParticleData
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{
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PxU32 mGridSizeX; //!< Size of the x-dimension of the background simulation grid. Translates to an absolute size of mGridSizeX * mParticleContactDistance.
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PxU32 mGridSizeY; //!< Size of the y-dimension of the background simulation grid. Translates to an absolute size of mGridSizeY * mParticleContactDistance.
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PxU32 mGridSizeZ; //!< Size of the z-dimension of the background simulation grid. Translates to an absolute size of mGridSizeZ * mParticleContactDistance.
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PxReal mParticleContactDistance; //!< Two particles start interacting if their distance is lower than mParticleContactDistance.
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PxReal mParticleContactDistanceInv; //!< 1.f / mParticleContactDistance.
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PxReal mParticleContactDistanceSq; //!< mParticleContactDistance * mParticleContactDistance.
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PxU32 mNumParticles; //!< The number of particles in this particle system.
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PxU32 mMaxParticles; //!< The maximum number of particles that can be simulated in this particle system.
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PxU32 mMaxNeighborhood; //!< The maximum number of particles considered when computing neighborhood based particle interactions.
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PxU32 mMaxDiffuseParticles; //!< The maximum number of diffuse particles that can be simulated using this particle system.
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PxU32 mNumParticleBuffers; //!< The number of particle buffers that are simulated in this particle system.
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};
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/**
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@brief Container class for a GPU particle system. Used to communicate particle system parameters and simulation state
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between the internal SDK simulation and the particle system callbacks.
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See #PxParticleSystem, #PxParticleSystemCallback.
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*/
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class PxGpuParticleSystem
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{
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public:
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/**
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@brief Returns the number of cells of the background simulation grid.
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@return PxU32 the number of cells.
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*/
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PX_FORCE_INLINE PxU32 getNumCells() { return mCommonData.mGridSizeX * mCommonData.mGridSizeY * mCommonData.mGridSizeZ; }
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/* Unsorted particle state buffers */
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float4* mUnsortedPositions_InvMass; //!< GPU pointer to unsorted particle positions and inverse masses.
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float4* mUnsortedVelocities; //!< GPU pointer to unsorted particle velocities.
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PxU32* mUnsortedPhaseArray; //!< GPU pointer to unsorted particle phase array. See #PxParticlePhase.
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/* Sorted particle state buffers. Sorted by increasing hash value in background grid. */
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float4* mSortedPositions_InvMass; //!< GPU pointer to sorted particle positions
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float4* mSortedVelocities; //!< GPU pointer to sorted particle velocities
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PxU32* mSortedPhaseArray; //!< GPU pointer to sorted particle phase array
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/* Mappings to/from sorted particle states */
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PxU32* mUnsortedToSortedMapping; //!< GPU pointer to the mapping from unsortedParticle ID to sorted particle ID
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PxU32* mSortedToUnsortedMapping; //!< GPU pointer to the mapping from sorted particle ID to unsorted particle ID
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/* Neighborhood information */
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PxU32* mParticleSelfCollisionCount; //!< Per-particle neighborhood count
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PxU32* mCollisionIndex; //!< Set of sorted particle indices per neighbor
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PxsParticleMaterialData* mParticleMaterials; //!< GPU pointer to the particle materials used in this particle system.
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PxGpuParticleData mCommonData; //!< Structure holding simulation parameters and state for this particle system. See #PxGpuParticleData.
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/**
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@brief Get a PxNeighborhoodIterator initialized for usage with this particle system.
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@param particleId An initial particle index for the initialization of the iterator.
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@return An initialized PxNeighborhoodIterator.
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*/
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PX_CUDA_CALLABLE PxNeighborhoodIterator getIterator(PxU32 particleId) const
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{
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return PxNeighborhoodIterator(mCollisionIndex + particleId, mCommonData.mMaxParticles);
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}
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};
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#if !PX_DOXYGEN
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} // namespace physx
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#endif
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#endif
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/** @} */
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#endif
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