Program Listing for include/PxParticleGpu.h

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#ifndef PX_GPU_PARTICLE_SYSTEM_H
#define PX_GPU_PARTICLE_SYSTEM_H

#include "foundation/PxSimpleTypes.h"
#include "foundation/PxVec3.h"

#include "PxParticleSystem.h"

#if !PX_DOXYGEN
namespace physx
{
#endif

struct PxsParticleMaterialData
{
    PxReal          friction;            // 4
    PxReal          damping;             // 8
    PxReal          adhesion;            // 12
    PxReal          gravityScale;        // 16
    PxReal          adhesionRadiusScale; // 20
};

#if !PX_DOXYGEN
} // namespace physx
#endif

#if PX_SUPPORT_GPU_PHYSX

struct float4;

PX_CUDA_CALLABLE inline physx::PxU32 PxGetGroup(physx::PxU32 phase) { return phase & physx::PxParticlePhaseFlag::eParticlePhaseGroupMask; }
PX_CUDA_CALLABLE inline bool PxGetFluid(physx::PxU32 phase) { return (phase & physx::PxParticlePhaseFlag::eParticlePhaseFluid) != 0; }
PX_CUDA_CALLABLE inline bool PxGetSelfCollide(physx::PxU32 phase) { return (phase & physx::PxParticlePhaseFlag::eParticlePhaseSelfCollide) != 0; }
PX_CUDA_CALLABLE inline bool PxGetSelfCollideFilter(physx::PxU32 phase) { return (phase & physx::PxParticlePhaseFlag::eParticlePhaseSelfCollideFilter) != 0; }

#if !PX_DOXYGEN
namespace physx
{
#endif

class PxNeighborhoodIterator
{

    const PxU32* PX_RESTRICT    mCollisionIndex;
    PxU32                       mMaxParticles;

public:
    PX_CUDA_CALLABLE PxNeighborhoodIterator(const PxU32* PX_RESTRICT collisionIndex, PxU32 maxParticles) :
        mCollisionIndex(collisionIndex), mMaxParticles(maxParticles)
    {
    }

    PX_CUDA_CALLABLE PxU32 getNextIndex()
    {
        PxU32 result = *mCollisionIndex;
        mCollisionIndex += mMaxParticles;
        return result;
    }

    PX_INLINE PxNeighborhoodIterator(const PxNeighborhoodIterator& params)
    {
        mCollisionIndex = params.mCollisionIndex;
        mMaxParticles = params.mMaxParticles;
    }

    PX_INLINE void operator = (const PxNeighborhoodIterator& params)
    {
        mCollisionIndex = params.mCollisionIndex;
        mMaxParticles = params.mMaxParticles;
    }
};

struct PxGpuParticleData
{
    PxVec3  mPeriod;

    PxU32   mGridSizeX;
    PxU32   mGridSizeY;
    PxU32   mGridSizeZ;

    PxReal  mParticleContactDistance;
    PxReal  mParticleContactDistanceInv;
    PxReal  mParticleContactDistanceSq;

    PxU32   mNumParticles;
    PxU32   mMaxParticles;
    PxU32   mMaxNeighborhood;
    PxU32   mMaxDiffuseParticles;
    PxU32   mNumParticleBuffers;
};

class PxGpuParticleSystem
{
public:

    PX_FORCE_INLINE PxU32 getNumCells() { return mCommonData.mGridSizeX * mCommonData.mGridSizeY * mCommonData.mGridSizeZ; }

    /* Unsorted particle state buffers */
    float4*                      mUnsortedPositions_InvMass;
    float4*                      mUnsortedVelocities;
    PxU32*                       mUnsortedPhaseArray;

    /* Sorted particle state buffers. Sorted by increasing hash value in background grid. */
    float4*                      mSortedPositions_InvMass;
    float4*                      mSortedVelocities;
    PxU32*                       mSortedPhaseArray;

    /* Mappings to/from sorted particle states */
    PxU32*                       mUnsortedToSortedMapping;
    PxU32*                       mSortedToUnsortedMapping;

    /* Neighborhood information */
    PxU32*                       mParticleSelfCollisionCount;
    PxU32*                       mCollisionIndex;

    PxsParticleMaterialData*     mParticleMaterials;
    PxGpuParticleData            mCommonData;

    PX_CUDA_CALLABLE PxNeighborhoodIterator getIterator(PxU32 particleId) const
    {
        return PxNeighborhoodIterator(mCollisionIndex + particleId, mCommonData.mMaxParticles);
    }
};

#if !PX_DOXYGEN
} // namespace physx
#endif

#endif

#endif