[2755] | 1 | #include <queue>
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| 2 | #include <stack>
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| 3 | #include <fstream>
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| 4 | #include <iostream>
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| 5 |
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| 6 | #include "BvhLoader.h"
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[2795] | 7 | #include "gzstream.h"
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[2755] | 8 |
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| 9 |
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[3021] | 10 | #ifdef _CRT_SET
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| 11 | #define _CRTDBG_MAP_ALLOC
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| 12 | #include <stdlib.h>
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| 13 | #include <crtdbg.h>
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| 14 |
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| 15 | // redefine new operator
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| 16 | #define DEBUG_NEW new(_NORMAL_BLOCK, __FILE__, __LINE__)
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| 17 | #define new DEBUG_NEW
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| 18 | #endif
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| 19 |
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| 20 |
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[2776] | 21 | namespace CHCDemoEngine
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[2755] | 22 | {
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| 23 |
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| 24 | using namespace std;
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| 25 |
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| 26 |
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| 27 | #define TYPE_INTERIOR -2
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| 28 | #define TYPE_LEAF -3
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| 29 |
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| 30 |
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| 31 |
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[2795] | 32 | BvhNode *BvhLoader::LoadNextNode(igzstream &stream, BvhInterior *parent)
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[2755] | 33 | {
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| 34 | int nodeType;
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| 35 | stream.read(reinterpret_cast<char *>(&nodeType), sizeof(int));
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| 36 |
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[2760] | 37 | BvhNode *node;
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| 38 |
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[2755] | 39 | if (nodeType == TYPE_LEAF)
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[2760] | 40 | node = new BvhLeaf(parent);
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| 41 | else if (nodeType == TYPE_INTERIOR)
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| 42 | node = new BvhInterior(parent);
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| 43 | else
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[2763] | 44 | cerr << "error: wrong node type: " << nodeType << endl;
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| 45 |
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[2755] | 46 |
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[2760] | 47 | Vector3 bMin, bMax;
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| 48 |
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| 49 | stream.read(reinterpret_cast<char *>(&(node->mFirst)), sizeof(int));
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| 50 | stream.read(reinterpret_cast<char *>(&(node->mLast)), sizeof(int));
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[2762] | 51 |
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[2760] | 52 | stream.read(reinterpret_cast<char *>(&bMin), sizeof(Vector3));
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| 53 | stream.read(reinterpret_cast<char *>(&bMax), sizeof(Vector3));
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| 54 |
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| 55 | node->mBox = AxisAlignedBox3(bMin, bMax);
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| 56 | node->mArea = node->mBox.SurfaceArea();
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| 57 |
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| 58 | //cout << "box: " << node->mBox << " area: " << node->mArea << endl;
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[2763] | 59 |
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[2760] | 60 | return node;
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[2755] | 61 | }
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| 62 |
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| 63 |
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[2760] | 64 | Bvh *BvhLoader::Load(const string &filename,
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[3072] | 65 | const SceneEntityContainer &staticEntities,
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| 66 | const SceneEntityContainer &dynamicEntities)
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[2755] | 67 | {
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[2761] | 68 | queue<BvhNode *> tQueue;
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[2795] | 69 | igzstream stream(filename.c_str());
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[2755] | 70 |
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| 71 | if (!stream.is_open()) return NULL;
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| 72 |
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| 73 | cout << "loading bvh" << endl;
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| 74 |
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[3072] | 75 | Bvh *bvh = new Bvh(staticEntities, dynamicEntities);
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[2755] | 76 |
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[3065] | 77 | BvhNode *root = LoadNextNode(stream, NULL);
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| 78 |
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[3072] | 79 | bvh->mStaticRoot = root;
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[3074] | 80 | // we have at least the root, the static and the dynamic branch
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[3072] | 81 | bvh->mNumNodes = 3;
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[3068] | 82 |
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[3072] | 83 | tQueue.push(root);
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[3068] | 84 |
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[2761] | 85 | while(!tQueue.empty())
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[2755] | 86 | {
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[2761] | 87 | BvhNode *node = tQueue.front();
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| 88 | tQueue.pop();
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[2755] | 89 |
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| 90 | if (!node->IsLeaf())
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| 91 | {
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| 92 | bvh->mNumNodes += 2;
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| 93 |
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| 94 | BvhInterior *interior = static_cast<BvhInterior *>(node);
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| 95 |
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[2761] | 96 | BvhNode *front = LoadNextNode(stream, interior);
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[2755] | 97 | BvhNode *back = LoadNextNode(stream, interior);
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[2761] | 98 |
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[2755] | 99 | interior->mFront = front;
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| 100 | interior->mBack = back;
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| 101 |
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| 102 | front->mDepth = interior->mDepth + 1;
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| 103 | back->mDepth = interior->mDepth + 1;
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| 104 |
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[2761] | 105 | tQueue.push(front);
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| 106 | tQueue.push(back);
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[2755] | 107 | }
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| 108 | }
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| 109 |
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[3074] | 110 | ///////////
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[3072] | 111 | //-- create dynamic part of the hierarchy
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[2796] | 112 |
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[3072] | 113 | bvh->CreateDynamicBranch();
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[2964] | 114 |
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[2760] | 115 | ///////////
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[2761] | 116 | //-- post process nodes
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[2755] | 117 |
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[2761] | 118 | bvh->PostProcess();
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[2962] | 119 |
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[3072] | 120 | cout << "... finished loading " << bvh->mNumNodes << " nodes" << endl;
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| 121 | cout << "scene box: " << bvh->mBox << endl;
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| 122 |
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[2755] | 123 | return bvh;
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| 124 | }
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| 125 |
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| 126 |
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| 127 | }
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