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43 lines
1.1 KiB
43 lines
1.1 KiB
//
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// Created by 14727 on 2022/12/11.
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//
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#ifndef NURBSEVALUATOR_BVH_CUH
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#define NURBSEVALUATOR_BVH_CUH
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#include "device/aabb.cuh"
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struct BVHNode {
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AABB bounds; // AABB包围盒
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int firstChild = -1, level = 0; // 第一个孩子节点的下标，该结点所在层次
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// 曲面片u, v的范围
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float u0 = 0., u1 = 0., v0 = 0., v1 = 0.;
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int idx_u = -1, idx_v = -1;
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};
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/**
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* 当前层的第一个节点的坐标
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* @param layer 层号。根节点为第一层
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*/
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__device__ __host__ int getStartIdxOfLayerN(int layer);
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/**
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* 根据u、v参数域中的小矩形的位置，判断它在BVH叶节点层（也就是最后一层）中的位置
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*/
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__device__ int d_getChildNodeIdx(int ix, int iy);
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__host__ int h_getChildNodeIdx(int ix, int iy);
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class BVH {
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public:
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int maxLevel, size;
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BVHNode *nodes = nullptr;
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__host__ void printQuadTree();
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};
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__global__ void
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g_buildBvh(const float *k, int level, const glm::vec3 *evaluatedPoints, float lastKnot_u, float lastKnot_v,
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int sampleCnt_u, int sampleCnt_v, BVHNode *BVH);
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#endif //NURBSEVALUATOR_BVH_CUH
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