[3242] | 1 | #include "VisibilitySolutionLoader.h"
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[3243] | 2 | #include "ViewCellsTree.h"
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| 3 | #include "Bvh.h"
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| 4 | #include <stack>
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[3242] | 5 |
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| 6 |
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| 7 | using namespace std;
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| 8 |
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| 9 |
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| 10 | namespace CHCDemoEngine
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| 11 | {
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| 12 |
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[3243] | 13 |
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| 14 | typedef vector<ViewCell *> ViewCellsContainer;
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| 15 |
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| 16 |
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| 17 | ViewCellsTree *VisibilitySolutionLoader::Load(const std::string &filename,
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| 18 | Bvh *bvh)
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[3242] | 19 | {
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[3243] | 20 | FILE *fr = fopen(filename.c_str(), "rb");
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| 21 |
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| 22 | cout << "Info: Loading visibility solution from file '" + filename + "'" << endl;
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| 23 |
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| 24 | if (fr == NULL)
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| 25 | {
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| 26 | cerr << "Error: Cannot open file for reading" << endl;
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| 27 | return NULL;
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| 28 | }
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| 29 |
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| 30 | float totalSamples;
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| 31 | float totalTime;
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| 32 |
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| 33 | fread(&totalSamples, sizeof(float), 1, fr);
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| 34 | fread(&totalTime, sizeof(float), 1, fr);
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| 35 |
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| 36 | ViewCellsTree *viewCellsTree = new ViewCellsTree();
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| 37 |
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| 38 | bool ok = viewCellsTree->_LoadFromFile(fr);
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| 39 |
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| 40 | if (ok)
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| 41 | {
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| 42 | // skip bvh loading
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| 43 | int buffer[6];
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| 44 | fread(buffer, sizeof(int), 6, fr);
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| 45 |
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| 46 | const size_t numNodes = buffer[5];
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| 47 |
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| 48 | for (int i = 0; i < numNodes; ++ i)
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| 49 | fread(buffer, sizeof(int), 4, fr);
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| 50 |
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| 51 | AllocateLeafViewCells(viewCellsTree);
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| 52 |
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| 53 | ok = LoadPvs(fr, bvh);
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| 54 | }
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| 55 |
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| 56 | fclose(fr);
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| 57 |
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| 58 | if (ok)
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| 59 | cerr << "Info: visibility solution loaded" << endl;
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| 60 | else
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| 61 | cerr << "Info: loading visibility solution failed." << endl;
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| 62 |
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| 63 | return viewCellsTree;
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| 64 | }
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| 65 |
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| 66 |
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| 67 | bool VisibilitySolutionLoader::CreateIdSortedList(Bvh *bvh, BvhNodeContainer &nodes)
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| 68 | {
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| 69 | std::stack<BvhNode *> tStack;
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| 70 | tStack.push(bvh->GetRoot());
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| 71 |
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| 72 | while (!tStack.empty())
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| 73 | {
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| 74 | BvhNode *node = tStack.top();
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| 75 | tStack.pop();
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| 76 |
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| 77 | nodes.push_back(node);
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| 78 |
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| 79 | if (!node->IsLeaf())
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| 80 | {
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| 81 | BvhInterior *interior = static_cast<BvhInterior *>(node);
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| 82 |
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| 83 | BvhNode *front = interior->GetFront();
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| 84 | BvhNode *back = interior->GetBack();
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| 85 |
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| 86 | tStack.push(front);
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| 87 | tStack.push(back);
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| 88 | }
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| 89 | }
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| 90 |
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[3242] | 91 | return true;
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| 92 | }
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| 93 |
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[3243] | 94 |
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| 95 | bool VisibilitySolutionLoader::LoadPvs(FILE *fw, Bvh *bvh)
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| 96 | {
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| 97 | int number, entries;
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| 98 |
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| 99 | fread(&number, sizeof(int), 1, fw);
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| 100 |
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| 101 | if (number == 0)
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| 102 | {
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| 103 | cerr << "Info: Warning empty PVSs in visibility solution" << endl;
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| 104 | return true;
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| 105 | }
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| 106 |
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| 107 | if (number != mViewCells.size())
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| 108 | {
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| 109 | cerr << "Info: Number of view cells does not match when loading PVSs!" << endl;
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| 110 | return false;
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| 111 | }
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| 112 |
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| 113 | BvhNodeContainer nodes;
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| 114 | CreateIdSortedList(bvh, nodes);
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| 115 |
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| 116 | for (int i = 0; i < number; ++ i)
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| 117 | {
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| 118 | fread(&entries, sizeof(int), 1, fw);
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| 119 |
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| 120 | for (int j=0; j < entries; ++ j)
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| 121 | {
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| 122 | int objectId;
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| 123 | float time;
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| 124 |
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| 125 | fread(&objectId, sizeof(int), 1, fw);
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| 126 | fread(&time, sizeof(float), 1, fw);
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| 127 |
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| 128 | BvhNode *node = nodes[objectId];
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| 129 |
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| 130 | int geometrySize;
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| 131 | SceneEntity **entities;
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| 132 | entities = bvh->GetGeometry(node, geometrySize);
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| 133 |
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| 134 | for (int k = 0; k < geometrySize; ++ k)
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| 135 | {
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| 136 | mViewCells[i]->mPvs.AddEntry(entities[k]);
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| 137 | }
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| 138 | }
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| 139 | }
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| 140 |
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| 141 | return true;
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| 142 | }
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| 143 |
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| 144 |
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| 145 | void VisibilitySolutionLoader::AllocateLeafViewCells(ViewCellsTree *viewCellsTree)
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| 146 | {
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| 147 | stack< pair<ViewCellsTreeNode *, AxisAlignedBox3> > nodeStack;
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| 148 |
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| 149 | nodeStack.push(pair<ViewCellsTreeNode *, AxisAlignedBox3>
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| 150 | (viewCellsTree->mRoot, viewCellsTree->mBox));
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| 151 |
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| 152 | int id = 0;
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| 153 |
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| 154 | mViewCells.clear();
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| 155 |
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| 156 | while (!nodeStack.empty())
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| 157 | {
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| 158 | ViewCellsTreeNode *node = nodeStack.top().first;
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| 159 |
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| 160 | if (node->IsLeaf())
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| 161 | {
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| 162 | if (node->mViewCell == NULL)
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| 163 | {
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| 164 | node->mViewCell = new ViewCell();
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| 165 | node->mViewCell->SetId(id ++);
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| 166 | node->mViewCell->SetBox(nodeStack.top().second);
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| 167 | }
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| 168 |
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| 169 | mViewCells.push_back(node->mViewCell);
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| 170 |
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| 171 | nodeStack.pop();
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| 172 | }
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| 173 | else
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| 174 | {
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| 175 | AxisAlignedBox3 box = nodeStack.top().second;
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| 176 | nodeStack.pop();
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| 177 |
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| 178 | AxisAlignedBox3 newBox = box;
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| 179 | newBox.SetMin(node->mAxis, node->mPosition);
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| 180 |
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| 181 | nodeStack.push(
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| 182 | pair<ViewCellsTreeNode *, AxisAlignedBox3>(node->mFront, newBox)
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| 183 | );
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| 184 |
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| 185 | newBox = box;
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| 186 | newBox.SetMax(node->mAxis, node->mPosition);
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| 187 |
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| 188 | nodeStack.push(
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| 189 | pair<ViewCellsTreeNode *, AxisAlignedBox3>(node->mBack, newBox)
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| 190 | );
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| 191 | }
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| 192 | }
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| 193 |
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| 194 | cout << "#of viewcells = " << id << endl;
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| 195 | }
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| 196 |
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| 197 |
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[3242] | 198 | } |
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