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/*
* Copyright (c) 2008-2017, NVIDIA CORPORATION. All rights reserved.
*
* NVIDIA CORPORATION and its licensors retain all intellectual property
* and proprietary rights in and to this software, 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.
*/
#ifndef APEX_MESH_HASH_H
#define APEX_MESH_HASH_H
#include "ApexDefs.h"
#include "ApexUsingNamespace.h"
#include "PsUserAllocated.h"
#include "PsArray.h"
#include "PxVec3.h"
namespace nvidia
{
namespace apex
{
struct MeshHashRoot
{
int32_t first;
uint32_t timeStamp;
};
struct MeshHashEntry
{
int32_t next;
uint32_t itemIndex;
};
class ApexMeshHash : public UserAllocated
{
public:
ApexMeshHash();
~ApexMeshHash();
void setGridSpacing(float spacing);
float getGridSpacing()
{
return 1.0f / mInvSpacing;
}
void reset();
void add(const PxBounds3& bounds, uint32_t itemIndex);
void add(const PxVec3& pos, uint32_t itemIndex);
void query(const PxBounds3& bounds, physx::Array<uint32_t>& itemIndices, int32_t maxIndices = -1);
void queryUnique(const PxBounds3& bounds, physx::Array<uint32_t>& itemIndices, int32_t maxIndices = -1);
void query(const PxVec3& pos, physx::Array<uint32_t>& itemIndices, int32_t maxIndices = -1);
void queryUnique(const PxVec3& pos, physx::Array<uint32_t>& itemIndices, int32_t maxIndices = -1);
// applied functions, only work if inserted objects are points!
int32_t getClosestPointNr(const PxVec3* points, uint32_t numPoints, uint32_t pointStride, const PxVec3& pos);
private:
enum
{
HashIndexSize = 170111
};
void compressIndices(physx::Array<uint32_t>& itemIndices);
float mSpacing;
float mInvSpacing;
uint32_t mTime;
inline uint32_t hashFunction(int32_t xi, int32_t yi, int32_t zi)
{
uint32_t h = (uint32_t)((xi * 92837111) ^(yi * 689287499) ^(zi * 283923481));
return h % HashIndexSize;
}
inline void cellCoordOf(const PxVec3& v, int& xi, int& yi, int& zi)
{
xi = (int)(v.x * mInvSpacing);
if (v.x < 0.0f)
{
xi--;
}
yi = (int)(v.y * mInvSpacing);
if (v.y < 0.0f)
{
yi--;
}
zi = (int)(v.z * mInvSpacing);
if (v.z < 0.0f)
{
zi--;
}
}
MeshHashRoot* mHashIndex;
physx::Array<MeshHashEntry> mEntries;
physx::Array<uint32_t> mTempIndices;
};
}
} // end namespace nvidia::apex
#endif
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