100 lines
2.5 KiB
C++
100 lines
2.5 KiB
C++
#pragma once
|
|
#ifndef NV_MATH_PROXIMITYGRID_H
|
|
#define NV_MATH_PROXIMITYGRID_H
|
|
|
|
#include "Vector.h"
|
|
#include "ftoi.h"
|
|
|
|
#include "nvcore/Array.inl"
|
|
|
|
|
|
// A simple, dynamic proximity grid based on Jon's code.
|
|
// Instead of storing pointers here I store indices.
|
|
|
|
namespace nv {
|
|
|
|
class Box;
|
|
|
|
struct Cell {
|
|
Array<uint> indexArray;
|
|
};
|
|
|
|
struct ProximityGrid {
|
|
ProximityGrid();
|
|
|
|
void reset();
|
|
void init(const Array<Vector3> & pointArray);
|
|
void init(const Box & box, uint count);
|
|
|
|
int index_x(float x) const;
|
|
int index_y(float y) const;
|
|
int index_z(float z) const;
|
|
int index(int x, int y, int z) const;
|
|
int index(const Vector3 & pos) const;
|
|
|
|
uint32 mortonCount() const;
|
|
int mortonIndex(uint32 code) const;
|
|
|
|
void add(const Vector3 & pos, uint key);
|
|
bool remove(const Vector3 & pos, uint key);
|
|
|
|
void gather(const Vector3 & pos, float radius, Array<uint> & indices);
|
|
|
|
Array<Cell> cellArray;
|
|
|
|
Vector3 corner;
|
|
Vector3 invCellSize;
|
|
int sx, sy, sz;
|
|
};
|
|
|
|
// For morton traversal, do:
|
|
// for (int code = 0; code < mortonCount(); code++) {
|
|
// int idx = mortonIndex(code);
|
|
// if (idx < 0) continue;
|
|
// }
|
|
|
|
|
|
|
|
inline int ProximityGrid::index_x(float x) const {
|
|
return clamp(ftoi_floor((x - corner.x) * invCellSize.x), 0, sx-1);
|
|
}
|
|
|
|
inline int ProximityGrid::index_y(float y) const {
|
|
return clamp(ftoi_floor((y - corner.y) * invCellSize.y), 0, sy-1);
|
|
}
|
|
|
|
inline int ProximityGrid::index_z(float z) const {
|
|
return clamp(ftoi_floor((z - corner.z) * invCellSize.z), 0, sz-1);
|
|
}
|
|
|
|
inline int ProximityGrid::index(int x, int y, int z) const {
|
|
nvDebugCheck(x >= 0 && x < sx);
|
|
nvDebugCheck(y >= 0 && y < sy);
|
|
nvDebugCheck(z >= 0 && z < sz);
|
|
int idx = (z * sy + y) * sx + x;
|
|
nvDebugCheck(idx >= 0 && uint(idx) < cellArray.count());
|
|
return idx;
|
|
}
|
|
|
|
inline int ProximityGrid::index(const Vector3 & pos) const {
|
|
int x = index_x(pos.x);
|
|
int y = index_y(pos.y);
|
|
int z = index_z(pos.z);
|
|
return index(x, y, z);
|
|
}
|
|
|
|
|
|
inline void ProximityGrid::add(const Vector3 & pos, uint key) {
|
|
uint idx = index(pos);
|
|
cellArray[idx].indexArray.append(key);
|
|
}
|
|
|
|
inline bool ProximityGrid::remove(const Vector3 & pos, uint key) {
|
|
uint idx = index(pos);
|
|
return cellArray[idx].indexArray.remove(key);
|
|
}
|
|
|
|
} // nv namespace
|
|
|
|
#endif // NV_MATH_PROXIMITYGRID_H
|