[2755] | 1 | #include "Bvh.h"
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| 2 | #include "Camera.h"
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| 3 | #include "Plane3.h"
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| 4 | #include "glInterface.h"
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| 5 | #include "Triangle3.h"
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[2756] | 6 | #include "SceneEntity.h"
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| 7 | #include "Geometry.h"
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[2773] | 8 | #include "RenderState.h"
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[2825] | 9 | #include "Material.h"
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[3264] | 10 | #include "BvhConstructor.h"
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[2795] | 11 | #include "gzstream.h"
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[2751] | 12 |
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[3021] | 13 | #include <queue>
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| 14 | #include <stack>
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| 15 | #include <fstream>
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| 16 | #include <iostream>
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| 17 | #include <iomanip>
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[2773] | 18 |
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[3021] | 19 |
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| 20 | #ifdef _CRT_SET
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| 21 | #define _CRTDBG_MAP_ALLOC
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| 22 | #include <stdlib.h>
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| 23 | #include <crtdbg.h>
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| 24 |
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| 25 | // redefine new operator
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| 26 | #define DEBUG_NEW new(_NORMAL_BLOCK, __FILE__, __LINE__)
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| 27 | #define new DEBUG_NEW
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| 28 | #endif
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| 29 |
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[2746] | 30 | #define INVALID_TEST ((unsigned int)-1)
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| 31 |
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| 32 | using namespace std;
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| 33 |
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[3072] | 34 |
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[3065] | 35 | namespace CHCDemoEngine
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| 36 | {
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[2746] | 37 |
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[2895] | 38 | int BvhNode::sCurrentState = 0;
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[2746] | 39 |
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[2895] | 40 |
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[2746] | 41 | /*
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| 42 | 3 x---------x 2
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| 43 | |\ \
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| 44 | | \ \
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| 45 | | \ \
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| 46 | | 4 x---------x 5
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| 47 | | | |
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| 48 | 0 x | x 1 |
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| 49 | \ | |
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| 50 | \ | |
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| 51 | \| |
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| 52 | 7 x---------x 6
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| 53 | */
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| 54 |
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| 55 | static unsigned int sIndices[] =
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| 56 | {7, // degenerated
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| 57 | 7, 6, 4, 5, 3, 2, 0, 1,
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| 58 | 1, 4, // degenerated
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| 59 | 4, 3, 7, 0, 6, 1, 5, 2,
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| 60 | 2 // degenerated
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| 61 | };
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| 62 |
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| 63 |
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[3202] | 64 | const static int NUM_INDICES_PER_BOX = 20;
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[2746] | 65 |
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| 66 | /* Order of vertices
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| 67 | 0 = (0, 0, 0)
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| 68 | 1 = (1, 0, 0)
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| 69 | 2 = (1, 1, 0)
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| 70 | 3 = (0, 1, 0)
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| 71 | 4 = (0, 1, 1)
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| 72 | 5 = (1, 1, 1)
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| 73 | 6 = (1, 0, 1)
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| 74 | 7 = (0, 0, 1)
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| 75 | */
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| 76 |
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[2755] | 77 | static Plane3 sNearPlane;
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[3065] | 78 | static float sNear;
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[2911] | 79 | static Frustum sFrustum;
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[2746] | 80 |
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[2755] | 81 | /// these values are valid for all nodes
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| 82 | static int sClipPlaneAABBVertexIndices[12];
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| 83 |
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[3201] | 84 | //#define ALIGN_INDICES
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[2795] | 85 |
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[3072] | 86 |
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[2746] | 87 | BvhNode::BvhNode(BvhNode *parent):
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| 88 | mParent(parent),
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| 89 | mAxis(-1),
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| 90 | mDepth(0),
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| 91 | mFirst(-1),
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| 92 | mLast(-1),
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| 93 | mNumTestNodes(1),
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| 94 | mTestNodesIdx(-1),
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[2755] | 95 | mIndicesPtr(-1),
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[2761] | 96 | mId(0),
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| 97 | mIsMaxDepthForVirtualLeaf(false),
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| 98 | mIsVirtualLeaf(false)
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[2746] | 99 | {
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[2895] | 100 | for (int i = 0; i < NUM_STATES; ++ i)
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| 101 | {
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| 102 | mPlaneMask[i] = 0;
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| 103 | mPreferredPlane[i]= 0;
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[2897] | 104 | mLastRenderedFrame[i] = -1;
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[2895] | 105 | }
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[2746] | 106 | }
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| 107 |
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| 108 |
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[2761] | 109 | BvhNode::~BvhNode()
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| 110 | {
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| 111 | }
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| 112 |
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| 113 |
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[2746] | 114 | void BvhNode::ResetVisibility()
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| 115 | {
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[2895] | 116 | for (int i = 0; i < NUM_STATES; ++ i)
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| 117 | {
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| 118 | mVisibility[i].Reset();
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[2897] | 119 | mLastRenderedFrame[i] = -1;
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| 120 | mPlaneMask[i] = 0;
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| 121 | mPreferredPlane[i]= 0;
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[2895] | 122 | }
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[2746] | 123 | }
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| 124 |
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| 125 |
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| 126 | void BvhNode::VisibilityInfo::Reset()
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| 127 | {
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| 128 | mIsVisible = false;
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[2770] | 129 | mAssumedVisibleFrameId = 0;
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[2746] | 130 | mLastVisitedFrame = -1;
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| 131 | mTimesInvisible = 0;
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| 132 | mIsFrustumCulled = false;
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| 133 | mIsNew = true;
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[2800] | 134 | mLastQueriedFrame = -1;
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[2746] | 135 | }
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| 136 |
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| 137 |
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[2792] | 138 | BvhInterior::~BvhInterior()
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| 139 | {
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| 140 | DEL_PTR(mBack);
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| 141 | DEL_PTR(mFront);
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| 142 | }
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| 143 |
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| 144 |
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[2746] | 145 | BvhLeaf::~BvhLeaf()
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| 146 | {
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| 147 | }
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| 148 |
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[3262] | 149 | BvhInterior::BvhInterior(BvhNode *parent):
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| 150 | mBack(NULL), mFront(NULL), BvhNode(parent)
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| 151 | {}
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[2746] | 152 |
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| 153 |
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[3262] | 154 | bool BvhInterior::IsLeaf() const
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| 155 | {
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| 156 | return false;
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| 157 | }
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[2746] | 158 |
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[3070] | 159 |
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| 160 |
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[3262] | 161 | BvhLeaf::BvhLeaf(BvhNode *parent): BvhNode(parent)
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| 162 | {}
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[3072] | 163 |
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[3262] | 164 |
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| 165 | bool BvhLeaf::IsLeaf() const
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| 166 | {
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| 167 | return true;
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[3070] | 168 | }
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| 169 |
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| 170 |
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[3262] | 171 |
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| 172 | /**********************************************************/
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| 173 | /* class Bvh implementation */
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| 174 | /**********************************************************/
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| 175 |
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| 176 |
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[2773] | 177 | Bvh::Bvh()
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| 178 | {
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| 179 | Init();
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| 180 | }
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[2746] | 181 |
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[2760] | 182 |
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[3072] | 183 | Bvh::Bvh(const SceneEntityContainer &staticEntities,
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| 184 | const SceneEntityContainer &dynamicEntities)
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[2746] | 185 | {
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[2773] | 186 | Init();
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| 187 |
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[3072] | 188 | mGeometrySize = staticEntities.size() + dynamicEntities.size();
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[2760] | 189 | mGeometry = new SceneEntity*[mGeometrySize];
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[2796] | 190 |
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[3072] | 191 | mStaticGeometrySize = staticEntities.size();
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| 192 | mDynamicGeometrySize = dynamicEntities.size();
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[2746] | 193 |
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[3072] | 194 | for (size_t i = 0; i < mStaticGeometrySize; ++ i)
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[2746] | 195 | {
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[3072] | 196 | mGeometry[i] = staticEntities[i];
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[2746] | 197 | }
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[3072] | 198 |
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| 199 | for (size_t i = 0; i < mDynamicGeometrySize; ++ i)
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| 200 | {
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| 201 | mGeometry[mStaticGeometrySize + i] = dynamicEntities[i];
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| 202 | }
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[3125] | 203 |
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[3266] | 204 | //cout << "max depth for testing children " << mMaxDepthForTestingChildren << endl;
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[2760] | 205 | }
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[2746] | 206 |
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| 207 |
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[3123] | 208 | Bvh::Bvh(const SceneEntityContainer &staticEntities,
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| 209 | const SceneEntityContainer &dynamicEntities,
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| 210 | int maxDepthForTestingChildren)
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| 211 | {
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| 212 | Init();
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| 213 |
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| 214 | mGeometrySize = staticEntities.size() + dynamicEntities.size();
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| 215 | mGeometry = new SceneEntity*[mGeometrySize];
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| 216 |
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| 217 | mStaticGeometrySize = staticEntities.size();
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| 218 | mDynamicGeometrySize = dynamicEntities.size();
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| 219 |
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| 220 | for (size_t i = 0; i < mStaticGeometrySize; ++ i)
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| 221 | {
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| 222 | mGeometry[i] = staticEntities[i];
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| 223 | }
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| 224 |
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| 225 | for (size_t i = 0; i < mDynamicGeometrySize; ++ i)
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| 226 | {
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| 227 | mGeometry[mStaticGeometrySize + i] = dynamicEntities[i];
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| 228 | }
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| 229 |
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| 230 | mMaxDepthForTestingChildren = maxDepthForTestingChildren;
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[3266] | 231 | //cout << "max depth for testing children " << mMaxDepthForTestingChildren << endl;
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[3123] | 232 | }
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| 233 |
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| 234 |
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[2746] | 235 | Bvh::~Bvh()
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| 236 | {
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[3074] | 237 | DEL_ARRAY_PTR(mVertices);
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| 238 | DEL_ARRAY_PTR(mIndices);
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| 239 | DEL_ARRAY_PTR(mTestIndices);
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| 240 | DEL_ARRAY_PTR(mGeometry);
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[2746] | 241 |
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| 242 | if (mRoot) delete mRoot;
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[2792] | 243 | // delete vbo
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| 244 | glDeleteBuffersARB(1, &mVboId);
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[2746] | 245 | }
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| 246 |
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| 247 |
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[2773] | 248 | void Bvh::Init()
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| 249 | {
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[3074] | 250 | mStaticRoot = NULL;
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[3064] | 251 | mDynamicRoot = NULL;
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[2773] | 252 | mRoot = NULL;
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[3064] | 253 |
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[2773] | 254 | mVertices = NULL;
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| 255 | mIndices = NULL;
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| 256 | mTestIndices = NULL;
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| 257 | mCurrentIndicesPtr = 0;
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| 258 | mNumNodes = 0;
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[2795] | 259 |
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[3064] | 260 | // nodes are tested using the subnodes from 3 levels below
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[3066] | 261 | mMaxDepthForTestingChildren = 3;
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[3064] | 262 | // the ratio of area between node and subnodes where
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| 263 | // testing the subnodes as proxy is still considered feasable
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[2795] | 264 | mAreaRatioThreshold = 2.0f;
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| 265 | //mAreaRatioThreshold = 1.4f;
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| 266 |
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[2773] | 267 | mVboId = -1;
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[3265] | 268 | // bounds the maximal depth of the dynamic branch
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| 269 | mMaxDepthForDynamicBranch = 10;
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[2773] | 270 | }
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| 271 |
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| 272 |
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[3064] | 273 |
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| 274 | //////////////////////
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| 275 | //-- functions that are used during the main traversal
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| 276 |
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| 277 | void Bvh::PullUpLastVisited(BvhNode *node, int frameId) const
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[2746] | 278 | {
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| 279 | BvhNode *parent = node->GetParent();
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| 280 |
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| 281 | while (parent && (parent->GetLastVisitedFrame() != frameId))
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| 282 | {
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| 283 | parent->SetLastVisitedFrame(frameId);
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| 284 | parent = parent->GetParent();
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| 285 | }
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| 286 | }
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| 287 |
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| 288 |
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| 289 | void Bvh::MakeParentsVisible(BvhNode *node)
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| 290 | {
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| 291 | BvhNode *parent = node->GetParent();
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| 292 |
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| 293 | while (parent && (!parent->IsVisible()))
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| 294 | {
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| 295 | parent->SetVisible(true);
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| 296 | parent = parent->GetParent();
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| 297 | }
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| 298 | }
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| 299 |
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| 300 |
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[3064] | 301 | ////////////////////////////////
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| 302 |
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[2746] | 303 | void Bvh::CollectLeaves(BvhNode *node, BvhLeafContainer &leaves)
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| 304 | {
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| 305 | stack<BvhNode *> tStack;
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| 306 | tStack.push(node);
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| 307 |
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| 308 | while (!tStack.empty())
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| 309 | {
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| 310 | BvhNode *node = tStack.top();
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| 311 |
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| 312 | tStack.pop();
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| 313 |
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| 314 | if (!node->IsLeaf())
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| 315 | {
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| 316 | BvhInterior *interior = static_cast<BvhInterior *>(node);
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| 317 |
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| 318 | tStack.push(interior->mFront);
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| 319 | tStack.push(interior->mBack);
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| 320 | }
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| 321 | else
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| 322 | {
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| 323 | leaves.push_back(static_cast<BvhLeaf *>(node));
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| 324 | }
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| 325 | }
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| 326 | }
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| 327 |
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| 328 |
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[3259] | 329 | int Bvh::CountNumNodes(BvhNode *node) const
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| 330 | {
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| 331 | int numNodes = 0;
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| 332 |
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| 333 | stack<BvhNode *> tStack;
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| 334 |
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| 335 | tStack.push(node);
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| 336 |
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| 337 | while (!tStack.empty())
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| 338 | {
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| 339 | BvhNode *node = tStack.top();
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| 340 | tStack.pop();
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| 341 |
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| 342 | ++ numNodes;
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| 343 |
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| 344 | if (!node->IsLeaf())
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| 345 | {
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| 346 | BvhInterior *interior = static_cast<BvhInterior *>(node);
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| 347 |
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| 348 | tStack.push(interior->mFront);
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| 349 | tStack.push(interior->mBack);
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| 350 | }
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| 351 | }
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| 352 |
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| 353 | return numNodes;
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| 354 | }
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| 355 |
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| 356 |
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[3274] | 357 | int Bvh::CountNumVirtualNodes(BvhNode *node) const
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| 358 | {
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| 359 | int numNodes = 0;
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| 360 |
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| 361 | stack<BvhNode *> tStack;
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| 362 |
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| 363 | tStack.push(node);
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| 364 |
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| 365 | while (!tStack.empty())
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| 366 | {
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| 367 | BvhNode *node = tStack.top();
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| 368 | tStack.pop();
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| 369 |
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| 370 | ++ numNodes;
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| 371 |
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| 372 | if (!node->IsVirtualLeaf())
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| 373 | {
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| 374 | BvhInterior *interior = static_cast<BvhInterior *>(node);
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| 375 |
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| 376 | tStack.push(interior->mFront);
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| 377 | tStack.push(interior->mBack);
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| 378 | }
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| 379 | }
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| 380 |
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| 381 | return numNodes;
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| 382 | }
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| 383 |
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| 384 |
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[2746] | 385 | void Bvh::CollectNodes(BvhNode *node, BvhNodeContainer &nodes)
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| 386 | {
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| 387 | stack<BvhNode *> tStack;
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| 388 |
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| 389 | tStack.push(node);
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| 390 |
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| 391 | while (!tStack.empty())
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| 392 | {
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| 393 | BvhNode *node = tStack.top();
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| 394 | tStack.pop();
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| 395 |
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| 396 | nodes.push_back(node);
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| 397 |
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| 398 | if (!node->IsLeaf())
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| 399 | {
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| 400 | BvhInterior *interior = static_cast<BvhInterior *>(node);
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| 401 |
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| 402 | tStack.push(interior->mFront);
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| 403 | tStack.push(interior->mBack);
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| 404 | }
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| 405 | }
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| 406 | }
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| 407 |
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| 408 |
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| 409 | typedef pair<BvhNode *, int> tPair;
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| 410 |
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[2755] | 411 | void Bvh::CollectNodes(BvhNode *root, BvhNodeContainer &nodes, int depth)
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[2746] | 412 | {
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| 413 | stack<tPair> tStack;
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| 414 | tStack.push(tPair(root, 0));
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| 415 |
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| 416 | while (!tStack.empty())
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| 417 | {
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| 418 | BvhNode *node = tStack.top().first;
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| 419 | const int d = tStack.top().second;
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| 420 |
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| 421 | tStack.pop();
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| 422 |
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[3065] | 423 | // found node in specified depth => take this node
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[2755] | 424 | if ((d == depth) || (node->IsLeaf()))
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[2746] | 425 | {
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| 426 | nodes.push_back(node);
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| 427 | }
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[2755] | 428 | else
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[2951] | 429 | {
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[2746] | 430 | BvhInterior *interior = static_cast<BvhInterior *>(node);
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| 431 |
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| 432 | tStack.push(tPair(interior->mFront, d + 1));
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| 433 | tStack.push(tPair(interior->mBack, d + 1));
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| 434 | }
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| 435 | }
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| 436 | }
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| 437 |
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| 438 |
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[2951] | 439 | SceneEntity **Bvh::GetGeometry(BvhNode *node, int &geometrySize) const
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[2746] | 440 | {
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| 441 | geometrySize = node->CountPrimitives();
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| 442 | return mGeometry + node->mFirst;
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| 443 | }
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| 444 |
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| 445 |
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[2762] | 446 | bool Bvh::TestPlane(BvhNode *node, int i, bool &bIntersect)
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| 447 | {
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| 448 | // do the test only if necessary
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[2895] | 449 | if (!(node->mPlaneMask[BvhNode::sCurrentState] & (1 << i)))
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[3065] | 450 | {
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[2763] | 451 | return true;
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[3065] | 452 | }
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| 453 |
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| 454 |
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[2763] | 455 | ////////
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| 456 | //-- test the n-vertex
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| 457 |
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| 458 | if ((node->mBox.GetDistance(sClipPlaneAABBVertexIndices[i * 2 + 0], sFrustum.mClipPlanes[i]) > 0.0f))
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| 459 | {
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| 460 | // outside
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[2895] | 461 | node->mPreferredPlane[BvhNode::sCurrentState] = i;
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[2763] | 462 | return false;
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[2762] | 463 | }
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| 464 |
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[2763] | 465 | ////////////
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| 466 | //-- test the p-vertex
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| 467 |
|
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| 468 | if (node->mBox.GetDistance(sClipPlaneAABBVertexIndices[i * 2 + 1], sFrustum.mClipPlanes[i]) <= 0.0f)
|
---|
| 469 | {
|
---|
| 470 | // completely inside: children don't need to check against this plane no more
|
---|
[2895] | 471 | node->mPlaneMask[BvhNode::sCurrentState] ^= 1 << i;
|
---|
[2763] | 472 | }
|
---|
| 473 | else
|
---|
| 474 | {
|
---|
| 475 | bIntersect = true;
|
---|
| 476 | }
|
---|
| 477 |
|
---|
[2762] | 478 | return true;
|
---|
| 479 | }
|
---|
| 480 |
|
---|
| 481 |
|
---|
[2755] | 482 | int Bvh::IsWithinViewFrustum(BvhNode *node)
|
---|
[2746] | 483 | {
|
---|
| 484 | bool bIntersect = false;
|
---|
| 485 |
|
---|
| 486 | if (node->GetParent())
|
---|
[2895] | 487 | node->mPlaneMask[BvhNode::sCurrentState] = node->GetParent()->mPlaneMask[BvhNode::sCurrentState];
|
---|
[2746] | 488 |
|
---|
| 489 | ////////
|
---|
[3065] | 490 | //-- apply frustum culling for the planes with index mPreferredPlane to 6
|
---|
[2763] | 491 |
|
---|
[2895] | 492 | for (int i = node->mPreferredPlane[BvhNode::sCurrentState]; i < 6; ++ i)
|
---|
[2762] | 493 | if (!TestPlane(node, i, bIntersect)) return 0;
|
---|
[2763] | 494 |
|
---|
[2895] | 495 |
|
---|
[2746] | 496 | //////////
|
---|
[3065] | 497 | //-- apply frustum culling for the planes with index 0 to mPreferredPlane
|
---|
[2746] | 498 |
|
---|
[2895] | 499 | for (int i = 0; i < node->mPreferredPlane[BvhNode::sCurrentState]; ++ i)
|
---|
[2762] | 500 | if (!TestPlane(node, i, bIntersect)) return 0;
|
---|
[2763] | 501 |
|
---|
[2746] | 502 | return bIntersect ? -1 : 1;
|
---|
| 503 | }
|
---|
| 504 |
|
---|
| 505 |
|
---|
[2911] | 506 | static void CalcNPVertexIndices(const Frustum &frustum, int *indices)
|
---|
| 507 | {
|
---|
| 508 | for (int i = 0; i < 6; ++ i)
|
---|
| 509 | {
|
---|
| 510 | // n-vertex
|
---|
| 511 | indices[i * 2 + 0] = AxisAlignedBox3::GetIndexNearestVertex(frustum.mClipPlanes[i].mNormal);
|
---|
| 512 | // p-vertex
|
---|
| 513 | indices[i * 2 + 1] = AxisAlignedBox3::GetIndexFarthestVertex(frustum.mClipPlanes[i].mNormal);
|
---|
| 514 | }
|
---|
| 515 | }
|
---|
| 516 |
|
---|
| 517 |
|
---|
[3074] | 518 | void Bvh::InitFrame(Camera *cam, RenderState *state)
|
---|
[2746] | 519 | {
|
---|
| 520 | // = 0011 1111 which means that at the beginning, all six planes have to frustum culled
|
---|
[2895] | 521 | mRoot->mPlaneMask[BvhNode::sCurrentState] = 0x3f;
|
---|
[2746] | 522 |
|
---|
[2897] | 523 | cam->CalcFrustum(sFrustum);
|
---|
[2911] | 524 | CalcNPVertexIndices(sFrustum, sClipPlaneAABBVertexIndices);
|
---|
[2746] | 525 |
|
---|
[2763] | 526 | // store near plane
|
---|
[2897] | 527 | sNearPlane = Plane3(cam->GetDirection(), cam->GetPosition());
|
---|
[3065] | 528 | sNear = cam->GetNear();
|
---|
[3053] | 529 |
|
---|
[3072] | 530 | // update dynamic part of the hierarchy
|
---|
| 531 | //if (!mDynamicEntities.empty())
|
---|
| 532 | if (mDynamicGeometrySize)
|
---|
[3053] | 533 | {
|
---|
[3267] | 534 | UpdateBoundingBoxes(mDynamicRoot);
|
---|
[3074] | 535 | UpdateDynamicBounds(state);
|
---|
[3053] | 536 | }
|
---|
[2746] | 537 | }
|
---|
| 538 |
|
---|
| 539 |
|
---|
[2954] | 540 | void Bvh::UpdateDistance(BvhNode *node) const
|
---|
[2746] | 541 | {
|
---|
[3065] | 542 | // q: should we use distance to center rather than the distance to the near plane?
|
---|
[3068] | 543 | // distance to near plane can also be used for checking near plane intersection
|
---|
| 544 | //node->mDistance = sNearPlane.Distance(node->GetBox().Center());
|
---|
| 545 | node->mDistance = node->GetBox().GetMinDistance(sNearPlane);
|
---|
[2746] | 546 | }
|
---|
| 547 |
|
---|
| 548 |
|
---|
[2947] | 549 | float Bvh::CalcMaxDistance(BvhNode *node) const
|
---|
| 550 | {
|
---|
[3068] | 551 | #if 1
|
---|
[2947] | 552 | return node->GetBox().GetMaxDistance(sNearPlane);
|
---|
[2951] | 553 |
|
---|
[3068] | 554 | #else
|
---|
| 555 | // use bounding boxes of geometry to determine max dist
|
---|
[2951] | 556 | float maxDist = .0f;
|
---|
| 557 |
|
---|
| 558 | int geometrySize;
|
---|
| 559 | SceneEntity **entities = GetGeometry(node, geometrySize);
|
---|
| 560 |
|
---|
| 561 | for (int i = 0; i < geometrySize; ++ i)
|
---|
| 562 | {
|
---|
| 563 | SceneEntity *ent = entities[i];
|
---|
[3070] | 564 | float dist = ent->GetWorldBoundingBox().GetMaxDistance(sNearPlane);
|
---|
[2951] | 565 |
|
---|
| 566 | if (dist > maxDist) maxDist = dist;
|
---|
| 567 | }
|
---|
| 568 |
|
---|
| 569 | return maxDist;
|
---|
[3068] | 570 | #endif
|
---|
[2947] | 571 | }
|
---|
| 572 |
|
---|
| 573 |
|
---|
[2786] | 574 | void Bvh::RenderBounds(BvhNode *node, RenderState *state, bool useTightBounds)
|
---|
[2746] | 575 | {
|
---|
[3065] | 576 | // hack: use dummy contayiner as wrapper in order to use multibox function
|
---|
| 577 | static BvhNodeContainer dummy(1);
|
---|
| 578 | dummy[0] = node;
|
---|
| 579 | RenderBounds(dummy, state, useTightBounds);
|
---|
[2746] | 580 | }
|
---|
| 581 |
|
---|
| 582 |
|
---|
[2786] | 583 | int Bvh::RenderBounds(const BvhNodeContainer &nodes,
|
---|
| 584 | RenderState *state,
|
---|
| 585 | bool useTightBounds)
|
---|
[2746] | 586 | {
|
---|
[2786] | 587 | int renderedBoxes;
|
---|
| 588 |
|
---|
| 589 | if (!useTightBounds)
|
---|
| 590 | {
|
---|
[3064] | 591 | // if not using tight bounds, rendering boxes in immediate mode
|
---|
| 592 | // is preferable to vertex arrays (less setup time)
|
---|
[2786] | 593 | BvhNodeContainer::const_iterator nit, nit_end = nodes.end();
|
---|
| 594 |
|
---|
| 595 | for (nit = nodes.begin(); nit != nit_end; ++ nit)
|
---|
| 596 | {
|
---|
| 597 | RenderBoundingBoxImmediate((*nit)->GetBox());
|
---|
| 598 | }
|
---|
[3065] | 599 |
|
---|
[2786] | 600 | renderedBoxes = (int)nodes.size();
|
---|
| 601 | }
|
---|
| 602 | else
|
---|
[3065] | 603 | {
|
---|
[2786] | 604 | renderedBoxes = PrepareBoundsWithDrawArrays(nodes);
|
---|
| 605 | RenderBoundsWithDrawArrays(renderedBoxes, state);
|
---|
| 606 | }
|
---|
| 607 |
|
---|
[2746] | 608 | return renderedBoxes;
|
---|
| 609 | }
|
---|
| 610 |
|
---|
| 611 |
|
---|
[2786] | 612 | int Bvh::PrepareBoundsWithDrawArrays(const BvhNodeContainer &nodes)
|
---|
[2746] | 613 | {
|
---|
[3064] | 614 | ///////////////////
|
---|
| 615 | //-- for the first time we come here => create vbo and indices
|
---|
[3074] | 616 |
|
---|
[2746] | 617 | if (!mIndices)
|
---|
[3064] | 618 | {
|
---|
| 619 | // create list of indices
|
---|
[2746] | 620 | CreateIndices();
|
---|
| 621 | }
|
---|
| 622 |
|
---|
[2773] | 623 | if (mVboId == -1)
|
---|
[2746] | 624 | {
|
---|
| 625 | // prepare the vbo
|
---|
| 626 | PrepareVertices();
|
---|
| 627 | }
|
---|
[3074] | 628 |
|
---|
[2746] | 629 | ///////////////
|
---|
| 630 |
|
---|
| 631 | int numNodes = 0;
|
---|
[3074] | 632 |
|
---|
[2746] | 633 | BvhNodeContainer::const_iterator nit, nit_end = nodes.end();
|
---|
| 634 |
|
---|
| 635 | for (nit = nodes.begin(); nit != nit_end; ++ nit)
|
---|
| 636 | {
|
---|
| 637 | BvhNode *node = *nit;
|
---|
[3202] | 638 | const int numIndices = node->mNumTestNodes * NUM_INDICES_PER_BOX;
|
---|
[2746] | 639 |
|
---|
| 640 | // copy indices
|
---|
[3202] | 641 | memcpy(mIndices + numNodes * NUM_INDICES_PER_BOX,
|
---|
[2746] | 642 | mTestIndices + node->mIndicesPtr,
|
---|
| 643 | numIndices * sizeof(unsigned int));
|
---|
[2795] | 644 |
|
---|
[2746] | 645 | numNodes += node->mNumTestNodes;
|
---|
| 646 | }
|
---|
[3074] | 647 |
|
---|
[2746] | 648 | return numNodes;
|
---|
| 649 | }
|
---|
| 650 |
|
---|
| 651 |
|
---|
[2786] | 652 | void Bvh::RenderBoundsWithDrawArrays(int numNodes, RenderState *state)
|
---|
[2746] | 653 | {
|
---|
[3064] | 654 | /////////
|
---|
| 655 | //-- Render the vbo
|
---|
[2773] | 656 |
|
---|
| 657 | if (state->GetCurrentVboId() != mVboId)
|
---|
| 658 | {
|
---|
| 659 | glBindBufferARB(GL_ARRAY_BUFFER_ARB, mVboId);
|
---|
[3294] | 660 | //glBindBufferARB(GL_ELEMENT_ARRAY_BUFFER_ARB, 0);
|
---|
[3293] | 661 |
|
---|
[2746] | 662 | // set the vertex pointer to the vertex buffer
|
---|
[2773] | 663 | glVertexPointer(3, GL_FLOAT, 0, (char *)NULL);
|
---|
[2746] | 664 |
|
---|
[2773] | 665 | state->SetCurrentVboId(mVboId);
|
---|
| 666 | }
|
---|
[2746] | 667 |
|
---|
[3202] | 668 | // we don't use the last or the first index (they are generate and only used to connect strips)
|
---|
| 669 | int numElements = numNodes * NUM_INDICES_PER_BOX - 1;
|
---|
[2746] | 670 | // don't render first degenerate index
|
---|
| 671 | glDrawElements(GL_TRIANGLE_STRIP, numElements, GL_UNSIGNED_INT, mIndices + 1);
|
---|
| 672 | }
|
---|
| 673 |
|
---|
| 674 |
|
---|
| 675 | void Bvh::CreateIndices()
|
---|
| 676 | {
|
---|
| 677 | // collect bvh nodes
|
---|
| 678 | BvhNodeContainer nodes;
|
---|
[3291] | 679 | // also add root
|
---|
| 680 | nodes.push_back(mRoot);
|
---|
[3202] | 681 | // first collect dynamic nodes so we make sure that they are in the beginning
|
---|
| 682 | CollectNodes(mDynamicRoot, nodes);
|
---|
| 683 | // then collect static nodes
|
---|
| 684 | CollectNodes(mStaticRoot, nodes);
|
---|
| 685 | //CollectNodes(mRoot, nodes);
|
---|
[3291] | 686 |
|
---|
[2746] | 687 |
|
---|
[2755] | 688 | cout << "creating new indices" << endl;
|
---|
[2746] | 689 |
|
---|
| 690 | int numMaxIndices = 0;
|
---|
| 691 |
|
---|
| 692 | BvhNodeContainer::const_iterator lit, lit_end = nodes.end();
|
---|
| 693 |
|
---|
| 694 | for (lit = nodes.begin(); lit != lit_end; ++ lit)
|
---|
| 695 | {
|
---|
[3202] | 696 | int offset = (*lit)->mNumTestNodes * NUM_INDICES_PER_BOX;
|
---|
[2795] | 697 | #ifdef ALIGN_INDICES
|
---|
[3064] | 698 | // align with 32 in order to speed up memcopy
|
---|
[2746] | 699 | offset = (offset / 32) * 32 + 32;
|
---|
| 700 | #endif
|
---|
| 701 | numMaxIndices += offset;
|
---|
| 702 | }
|
---|
| 703 |
|
---|
[2755] | 704 | cout << "creating global indices buffer" << endl;
|
---|
[2746] | 705 |
|
---|
[3202] | 706 | if (mIndices) delete [] mIndices;
|
---|
[2746] | 707 | if (mTestIndices) delete [] mTestIndices;
|
---|
| 708 |
|
---|
| 709 | // global buffer: create it once so we don't have
|
---|
[3202] | 710 | // to allocate memory for each individual chunk of the node
|
---|
[2746] | 711 | mIndices = new unsigned int[numMaxIndices];
|
---|
| 712 | // create new index buffer for the individual nodes
|
---|
| 713 | mTestIndices = new unsigned int[numMaxIndices];
|
---|
| 714 |
|
---|
| 715 | mCurrentIndicesPtr = 0;
|
---|
| 716 |
|
---|
| 717 | for (lit = nodes.begin(); lit != lit_end; ++ lit)
|
---|
| 718 | {
|
---|
| 719 | BvhNode *node = *lit;
|
---|
| 720 |
|
---|
| 721 | // resize array
|
---|
| 722 | node->mIndicesPtr = mCurrentIndicesPtr;
|
---|
| 723 | int numIndices = 0;
|
---|
| 724 |
|
---|
[3065] | 725 | // the bounding boxes of the test nodes are rendered instead of the node itself
|
---|
[2746] | 726 | // => store their indices
|
---|
[3202] | 727 | for (int i = 0; i < node->mNumTestNodes; ++ i, numIndices += NUM_INDICES_PER_BOX)
|
---|
[2746] | 728 | {
|
---|
[2755] | 729 | BvhNode *testNode = mTestNodes[node->mTestNodesIdx + i];
|
---|
[2746] | 730 |
|
---|
[3202] | 731 | // add vertex indices of boxes to root node
|
---|
| 732 | for (int j = 0; j < NUM_INDICES_PER_BOX; ++ j)
|
---|
[2746] | 733 | {
|
---|
| 734 | mTestIndices[mCurrentIndicesPtr + numIndices + j] = sIndices[j] + testNode->GetId() * 8;
|
---|
| 735 | }
|
---|
| 736 | }
|
---|
| 737 |
|
---|
| 738 | // align with 32
|
---|
[2795] | 739 | #ifdef ALIGN_INDICES
|
---|
[2746] | 740 | const int offset = (numIndices / 32) * 32 + 32;
|
---|
| 741 | #else
|
---|
| 742 | const int offset = numIndices;
|
---|
| 743 | #endif
|
---|
| 744 | mCurrentIndicesPtr += offset;
|
---|
| 745 | }
|
---|
| 746 | }
|
---|
| 747 |
|
---|
| 748 |
|
---|
| 749 | void Bvh::ComputeIds()
|
---|
| 750 | {
|
---|
[2756] | 751 | // collect all nodes
|
---|
[2755] | 752 | BvhNodeContainer nodes;
|
---|
[3291] | 753 | // also add root
|
---|
| 754 | nodes.push_back(mRoot);
|
---|
[3074] | 755 | //CollectNodes(mRoot, nodes);
|
---|
| 756 | // first collect dynamic nodes so we make sure that they are in the beginning
|
---|
| 757 | CollectNodes(mDynamicRoot, nodes);
|
---|
| 758 | // then collect static nodes
|
---|
| 759 | CollectNodes(mStaticRoot, nodes);
|
---|
[2746] | 760 |
|
---|
[3074] | 761 | // assign ids to all nodes of the hierarchy
|
---|
[2746] | 762 | int i = 0;
|
---|
[2756] | 763 | BvhNodeContainer::const_iterator lit, lit_end = nodes.end();
|
---|
[2746] | 764 |
|
---|
| 765 | for (lit = nodes.begin(); lit != lit_end; ++ lit, ++ i)
|
---|
| 766 | {
|
---|
| 767 | (*lit)->SetId(i);
|
---|
| 768 | }
|
---|
| 769 | }
|
---|
| 770 |
|
---|
[2756] | 771 |
|
---|
[2746] | 772 | void Bvh::PrepareVertices()
|
---|
| 773 | {
|
---|
[2755] | 774 | // collect all nodes
|
---|
| 775 | BvhNodeContainer nodes;
|
---|
[2746] | 776 |
|
---|
[3073] | 777 | nodes.reserve(GetNumNodes());
|
---|
[3291] | 778 | // also add root
|
---|
| 779 | nodes.push_back(mRoot);
|
---|
[3074] | 780 | // first collect dynamic nodes so we make sure that they are in the beginning
|
---|
| 781 | CollectNodes(mDynamicRoot, nodes);
|
---|
| 782 | // then collect static nodes
|
---|
| 783 | CollectNodes(mStaticRoot, nodes);
|
---|
[2746] | 784 |
|
---|
| 785 | const unsigned int bufferSize = 8 * (int)nodes.size();
|
---|
[2755] | 786 | mVertices = new Vector3[bufferSize];
|
---|
[2746] | 787 |
|
---|
| 788 | int i = 0;
|
---|
| 789 |
|
---|
| 790 | // store bounding box vertices
|
---|
[2755] | 791 | BvhNodeContainer::const_iterator lit, lit_end = nodes.end();
|
---|
[2746] | 792 |
|
---|
| 793 | for (lit = nodes.begin(); lit != lit_end; ++ lit, i += 8)
|
---|
| 794 | {
|
---|
[2755] | 795 | BvhNode *node = *lit;
|
---|
[3202] | 796 | Vector3 v;
|
---|
| 797 |
|
---|
[2746] | 798 | for (int j = 0; j < 8; ++ j)
|
---|
[3202] | 799 | {
|
---|
| 800 | node->GetBox().GetVertex2(j, v);
|
---|
| 801 | (static_cast<Vector3 *>(mVertices))[node->GetId() * 8 + j] = v;
|
---|
| 802 | }
|
---|
[2746] | 803 | }
|
---|
| 804 |
|
---|
[2773] | 805 | glGenBuffersARB(1, &mVboId);
|
---|
| 806 | glBindBufferARB(GL_ARRAY_BUFFER_ARB, mVboId);
|
---|
| 807 | glVertexPointer(3, GL_FLOAT, 0, (char *)NULL);
|
---|
[2746] | 808 |
|
---|
[2773] | 809 | glBufferDataARB(GL_ARRAY_BUFFER_ARB,
|
---|
| 810 | bufferSize * sizeof(Vector3),
|
---|
| 811 | mVertices,
|
---|
[3074] | 812 | //GL_STATIC_DRAW_ARB);
|
---|
| 813 | GL_DYNAMIC_DRAW_ARB);
|
---|
[2746] | 814 |
|
---|
[2800] | 815 | glBindBufferARB(GL_ARRAY_BUFFER_ARB, 0);
|
---|
[2746] | 816 |
|
---|
[2773] | 817 | // data handled by graphics driver from now on
|
---|
[3074] | 818 | DEL_ARRAY_PTR(mVertices);
|
---|
[2746] | 819 |
|
---|
[3064] | 820 | cout << "******** created vbos for tighter bounds *********" << endl;
|
---|
[2746] | 821 | }
|
---|
| 822 |
|
---|
| 823 |
|
---|
[3074] | 824 | void Bvh::UpdateDynamicBounds(RenderState *state)
|
---|
| 825 | {
|
---|
| 826 | // vbos not created yet
|
---|
| 827 | if (mVboId == -1) return;
|
---|
| 828 |
|
---|
| 829 | // collect all nodes
|
---|
| 830 | static BvhNodeContainer nodes;
|
---|
| 831 | nodes.clear();
|
---|
[3259] | 832 |
|
---|
[3271] | 833 | // also add root
|
---|
| 834 | nodes.push_back(mRoot);
|
---|
[3291] | 835 |
|
---|
| 836 | CollectNodes(mDynamicRoot, nodes);
|
---|
[3074] | 837 |
|
---|
[3291] | 838 |
|
---|
[3074] | 839 | const unsigned int bufferSize = 8 * (int)nodes.size();
|
---|
| 840 | if (!mVertices) mVertices = new Vector3[bufferSize];
|
---|
| 841 |
|
---|
| 842 | int i = 0;
|
---|
| 843 |
|
---|
| 844 | // store bounding box vertices
|
---|
| 845 | BvhNodeContainer::const_iterator lit, lit_end = nodes.end();
|
---|
| 846 |
|
---|
| 847 | for (lit = nodes.begin(); lit != lit_end; ++ lit, i += 8)
|
---|
| 848 | {
|
---|
| 849 | BvhNode *node = *lit;
|
---|
| 850 |
|
---|
| 851 | for (int j = 0; j < 8; ++ j)
|
---|
[3271] | 852 | {
|
---|
[3074] | 853 | (static_cast<Vector3 *>(mVertices))[node->GetId() * 8 + j] = node->GetBox().GetVertex(j);
|
---|
[3271] | 854 | }
|
---|
[3074] | 855 | }
|
---|
| 856 |
|
---|
| 857 | if (state->GetCurrentVboId() != mVboId)
|
---|
| 858 | {
|
---|
| 859 | glBindBufferARB(GL_ARRAY_BUFFER_ARB, mVboId);
|
---|
| 860 | // set the vertex pointer to the vertex buffer
|
---|
| 861 | glVertexPointer(3, GL_FLOAT, 0, (char *)NULL);
|
---|
| 862 | state->SetCurrentVboId(mVboId);
|
---|
| 863 | }
|
---|
[3294] | 864 | // update bounds of dynamic hierarchy
|
---|
[3074] | 865 | glBufferSubDataARB(GL_ARRAY_BUFFER_ARB, 0,
|
---|
| 866 | bufferSize * sizeof(Vector3),
|
---|
| 867 | mVertices);
|
---|
| 868 | }
|
---|
| 869 |
|
---|
| 870 |
|
---|
[2755] | 871 | void Bvh::SetMaxDepthForTestingChildren(int maxDepth)
|
---|
[2746] | 872 | {
|
---|
| 873 | if (maxDepth != mMaxDepthForTestingChildren)
|
---|
| 874 | {
|
---|
| 875 | mMaxDepthForTestingChildren = maxDepth;
|
---|
| 876 | RecomputeBounds();
|
---|
| 877 | }
|
---|
| 878 | }
|
---|
| 879 |
|
---|
| 880 |
|
---|
[2755] | 881 | void Bvh::SetAreaRatioThresholdForTestingChildren(float ratio)
|
---|
[2746] | 882 | {
|
---|
| 883 | if (ratio != mAreaRatioThreshold)
|
---|
| 884 | {
|
---|
| 885 | mAreaRatioThreshold = ratio;
|
---|
| 886 | RecomputeBounds();
|
---|
| 887 | }
|
---|
| 888 | }
|
---|
| 889 |
|
---|
| 890 |
|
---|
| 891 | void Bvh::RecomputeBounds()
|
---|
| 892 | {
|
---|
| 893 | // collect all nodes
|
---|
| 894 | BvhNodeContainer nodes;
|
---|
[3065] | 895 | CollectNodes(mRoot, nodes);
|
---|
[2746] | 896 |
|
---|
[3269] | 897 | cout << "\nrecomputing bounds, children will be tested in depth " << mMaxDepthForTestingChildren << endl;
|
---|
[2746] | 898 |
|
---|
| 899 | int success = 0;
|
---|
| 900 | BvhNodeContainer::const_iterator lit, lit_end = nodes.end();
|
---|
| 901 |
|
---|
| 902 | for (lit = nodes.begin(); lit != lit_end; ++ lit)
|
---|
| 903 | {
|
---|
| 904 | BvhNode *node = *lit;
|
---|
| 905 |
|
---|
[2795] | 906 | // recreate list of nodes that will be queried as a proxy
|
---|
[2755] | 907 | if (CreateNodeRenderList(node))
|
---|
| 908 | ++ success;
|
---|
[2746] | 909 | }
|
---|
| 910 |
|
---|
[2755] | 911 | float p = 100.0f * (float)success / nodes.size();
|
---|
| 912 | cout << "created tighter bounds for " << p << " percent of the nodes" << endl;
|
---|
[2746] | 913 |
|
---|
[3267] | 914 | // recreate indices used for indirect rendering mode
|
---|
[2894] | 915 | if (mIndices) CreateIndices();
|
---|
[2746] | 916 | }
|
---|
| 917 |
|
---|
| 918 |
|
---|
| 919 | bool Bvh::CreateNodeRenderList(BvhNode *node)
|
---|
| 920 | {
|
---|
[2755] | 921 | BvhNodeContainer children;
|
---|
[2746] | 922 |
|
---|
[2755] | 923 | // collect nodes that will be tested instead of the leaf node
|
---|
| 924 | // in order to get a tighter bounding box test
|
---|
| 925 | CollectNodes(node, children, mMaxDepthForTestingChildren);
|
---|
| 926 |
|
---|
[2746] | 927 |
|
---|
| 928 | // using the tighter bounds is not feasable in case
|
---|
| 929 | // that the tighter bounds represent nearly the same projected area
|
---|
[3064] | 930 | // as the old bounding box. Test this property using either
|
---|
| 931 | // volume or area heuristics
|
---|
[2746] | 932 |
|
---|
| 933 | float vol = 0;
|
---|
| 934 | float area = 0;
|
---|
| 935 |
|
---|
[2755] | 936 | BvhNodeContainer::const_iterator cit;
|
---|
[2746] | 937 |
|
---|
| 938 | for (cit = children.begin(); cit != children.end(); ++ cit)
|
---|
[2755] | 939 | area += (*cit)->GetBox().SurfaceArea();
|
---|
[2746] | 940 |
|
---|
[2755] | 941 | const float areaRatio = area / node->GetBox().SurfaceArea();
|
---|
[2746] | 942 |
|
---|
| 943 | bool success;
|
---|
| 944 |
|
---|
[2755] | 945 | if (areaRatio < mAreaRatioThreshold)
|
---|
[2746] | 946 | success = true;
|
---|
| 947 | else
|
---|
| 948 | {
|
---|
| 949 | // hack: only store node itself
|
---|
| 950 | children.clear();
|
---|
| 951 | children.push_back(node);
|
---|
| 952 |
|
---|
| 953 | success = false;
|
---|
| 954 | }
|
---|
| 955 |
|
---|
| 956 | // the new test nodes are added at the end of the vector
|
---|
[2755] | 957 | node->mTestNodesIdx = (int)mTestNodes.size();
|
---|
[2746] | 958 |
|
---|
[3072] | 959 | // use the collected nodes as proxy for the occlusion tests
|
---|
[2746] | 960 | for (cit = children.begin(); cit != children.end(); ++ cit)
|
---|
| 961 | {
|
---|
[2755] | 962 | BvhNode *child = *cit;
|
---|
[2746] | 963 | mTestNodes.push_back(child);
|
---|
| 964 | }
|
---|
| 965 |
|
---|
| 966 | node->mNumTestNodes = (int)children.size();
|
---|
| 967 |
|
---|
| 968 | return success;
|
---|
| 969 | }
|
---|
| 970 |
|
---|
| 971 |
|
---|
| 972 | void Bvh::ResetNodeClassifications()
|
---|
| 973 | {
|
---|
| 974 | BvhNodeContainer nodes;
|
---|
| 975 |
|
---|
| 976 | nodes.reserve(GetNumNodes());
|
---|
| 977 | CollectNodes(mRoot, nodes);
|
---|
| 978 |
|
---|
| 979 | BvhNodeContainer::const_iterator lit, lit_end = nodes.end();
|
---|
| 980 |
|
---|
| 981 | for (lit = nodes.begin(); lit != lit_end; ++ lit)
|
---|
| 982 | {
|
---|
| 983 | (*lit)->ResetVisibility();
|
---|
| 984 | }
|
---|
| 985 | }
|
---|
| 986 |
|
---|
| 987 |
|
---|
[3070] | 988 | void Bvh::ComputeBvhStats(BvhNode *root, BvhStats &bvhStats)
|
---|
[2746] | 989 | {
|
---|
[3070] | 990 | bvhStats.Reset();
|
---|
[2746] | 991 | std::stack<BvhNode *> nodeStack;
|
---|
[3070] | 992 | nodeStack.push(root);
|
---|
[2746] | 993 |
|
---|
[2786] | 994 | int numVirtualLeaves = 0;
|
---|
[3070] | 995 | int numGeometry = 0;
|
---|
[3267] | 996 |
|
---|
[2746] | 997 | while (!nodeStack.empty())
|
---|
| 998 | {
|
---|
| 999 | BvhNode *node = nodeStack.top();
|
---|
| 1000 | nodeStack.pop();
|
---|
| 1001 |
|
---|
[2773] | 1002 | if (node->IsVirtualLeaf())
|
---|
[2746] | 1003 | {
|
---|
[2786] | 1004 | ++ numVirtualLeaves;
|
---|
[3070] | 1005 | numGeometry += node->CountPrimitives();
|
---|
[2786] | 1006 |
|
---|
[2746] | 1007 | BvhLeaf *leaf = static_cast<BvhLeaf *>(node);
|
---|
| 1008 |
|
---|
[3070] | 1009 | bvhStats.mTriangles += CountTriangles(leaf);
|
---|
| 1010 | bvhStats.mLeafSA += leaf->mBox.SurfaceArea();
|
---|
| 1011 | bvhStats.mLeafVol += leaf->mBox.GetVolume();
|
---|
[2746] | 1012 | }
|
---|
| 1013 | else
|
---|
| 1014 | {
|
---|
[3070] | 1015 | bvhStats.mInteriorSA += node->mBox.SurfaceArea();
|
---|
| 1016 | bvhStats.mInteriorVol += node->mBox.GetVolume();
|
---|
[2746] | 1017 |
|
---|
| 1018 | BvhInterior *interior = static_cast<BvhInterior *>(node);
|
---|
| 1019 |
|
---|
| 1020 | nodeStack.push(interior->mBack);
|
---|
| 1021 | nodeStack.push(interior->mFront);
|
---|
| 1022 | }
|
---|
| 1023 | }
|
---|
| 1024 |
|
---|
[3070] | 1025 | bvhStats.mGeometryRatio = (float)numGeometry / numVirtualLeaves;
|
---|
| 1026 | bvhStats.mTriangleRatio = (float)bvhStats.mTriangles / numVirtualLeaves;
|
---|
| 1027 | bvhStats.mLeaves = numVirtualLeaves;
|
---|
[2746] | 1028 | }
|
---|
| 1029 |
|
---|
| 1030 |
|
---|
[3266] | 1031 | void Bvh::PrintBvhStats(const BvhStats &bvhStats, BvhNode *root) const
|
---|
[2746] | 1032 | {
|
---|
[3266] | 1033 | cout << "interiorNodesSA = " << bvhStats.mInteriorSA / root->mBox.SurfaceArea() << endl;
|
---|
| 1034 | cout << "leafNodesSA = " << bvhStats.mLeafSA / root->mBox.SurfaceArea() << endl;
|
---|
| 1035 | cout << "interiorNodesVolume = " << bvhStats.mInteriorVol / root->mBox.GetVolume() << endl;
|
---|
| 1036 | cout << "leafNodesVolume = " << bvhStats.mLeafVol / root->mBox.GetVolume() << endl;
|
---|
[2746] | 1037 |
|
---|
[3070] | 1038 | cout << "geometry per leaf: " << bvhStats.mGeometryRatio << endl;
|
---|
| 1039 | cout << "triangles per leaf: " << bvhStats.mTriangleRatio << endl;
|
---|
| 1040 | cout << "===========================================" << endl << endl;
|
---|
[2746] | 1041 | }
|
---|
| 1042 |
|
---|
| 1043 |
|
---|
| 1044 | int Bvh::CountTriangles(BvhNode *node) const
|
---|
| 1045 | {
|
---|
| 1046 | int numTriangles = 0;
|
---|
| 1047 |
|
---|
| 1048 | for (int i = node->mFirst; i <= node->mLast; ++ i)
|
---|
[2774] | 1049 | {
|
---|
[2848] | 1050 | numTriangles += mGeometry[i]->CountNumTriangles(0);
|
---|
[2774] | 1051 | }
|
---|
| 1052 |
|
---|
[2746] | 1053 | return numTriangles;
|
---|
| 1054 | }
|
---|
| 1055 |
|
---|
| 1056 |
|
---|
[2756] | 1057 | float Bvh::GetArea(BvhNode *node) const
|
---|
[2746] | 1058 | {
|
---|
| 1059 | return node->mArea;
|
---|
| 1060 | }
|
---|
| 1061 |
|
---|
[2760] | 1062 |
|
---|
| 1063 | void Bvh::UpdateNumLeaves(BvhNode *node) const
|
---|
| 1064 | {
|
---|
| 1065 | if (node->IsLeaf())
|
---|
| 1066 | {
|
---|
| 1067 | node->mNumLeaves = 1;
|
---|
| 1068 | }
|
---|
| 1069 | else
|
---|
| 1070 | {
|
---|
| 1071 | BvhNode *f = static_cast<BvhInterior *>(node)->GetFront();
|
---|
| 1072 | BvhNode *b = static_cast<BvhInterior *>(node)->GetBack();
|
---|
| 1073 |
|
---|
| 1074 | UpdateNumLeaves(f);
|
---|
| 1075 | UpdateNumLeaves(b);
|
---|
| 1076 |
|
---|
| 1077 | node->mNumLeaves = f->mNumLeaves + b->mNumLeaves;
|
---|
| 1078 | }
|
---|
[2746] | 1079 | }
|
---|
[2760] | 1080 |
|
---|
| 1081 |
|
---|
[2761] | 1082 | void Bvh::CollectVirtualLeaves(BvhNode *node, BvhNodeContainer &leaves)
|
---|
| 1083 | {
|
---|
| 1084 | stack<BvhNode *> tStack;
|
---|
| 1085 | tStack.push(node);
|
---|
| 1086 |
|
---|
| 1087 | while (!tStack.empty())
|
---|
| 1088 | {
|
---|
| 1089 | BvhNode *node = tStack.top();
|
---|
| 1090 | tStack.pop();
|
---|
| 1091 |
|
---|
| 1092 | if (node->mIsVirtualLeaf)
|
---|
| 1093 | {
|
---|
| 1094 | leaves.push_back(node);
|
---|
| 1095 | }
|
---|
| 1096 | else if (!node->IsLeaf())
|
---|
| 1097 | {
|
---|
| 1098 | BvhInterior *interior = static_cast<BvhInterior *>(node);
|
---|
| 1099 |
|
---|
| 1100 | tStack.push(interior->mFront);
|
---|
| 1101 | tStack.push(interior->mBack);
|
---|
| 1102 | }
|
---|
| 1103 | }
|
---|
[2760] | 1104 | }
|
---|
[2761] | 1105 |
|
---|
| 1106 |
|
---|
| 1107 | void Bvh::SetVirtualLeaves(int numTriangles)
|
---|
| 1108 | {
|
---|
[3064] | 1109 | // first invalidate old virtual leaves
|
---|
[2761] | 1110 | BvhNodeContainer leaves;
|
---|
[3065] | 1111 | CollectVirtualLeaves(mRoot, leaves);
|
---|
[2761] | 1112 |
|
---|
| 1113 | BvhNodeContainer::const_iterator bit, bit_end = leaves.end();
|
---|
| 1114 |
|
---|
| 1115 | for (bit = leaves.begin(); bit != bit_end; ++ bit)
|
---|
| 1116 | {
|
---|
| 1117 | (*bit)->mIsVirtualLeaf = false;
|
---|
| 1118 | }
|
---|
| 1119 |
|
---|
[2764] | 1120 | mNumVirtualNodes = 0;
|
---|
[3064] | 1121 | // assign new virtual leaves based on specified #triangles per leaf
|
---|
[2761] | 1122 | std::stack<BvhNode *> nodeStack;
|
---|
[3267] | 1123 | nodeStack.push(mStaticRoot);
|
---|
| 1124 | nodeStack.push(mDynamicRoot);
|
---|
[2761] | 1125 |
|
---|
| 1126 | while (!nodeStack.empty())
|
---|
| 1127 | {
|
---|
| 1128 | BvhNode *node = nodeStack.top();
|
---|
| 1129 | nodeStack.pop();
|
---|
| 1130 |
|
---|
[2764] | 1131 | ++ mNumVirtualNodes;
|
---|
| 1132 |
|
---|
[2761] | 1133 | if (node->IsLeaf())
|
---|
| 1134 | {
|
---|
| 1135 | BvhLeaf *leaf = static_cast<BvhLeaf *>(node);
|
---|
| 1136 | leaf->mIsVirtualLeaf = true;
|
---|
| 1137 | }
|
---|
| 1138 | else
|
---|
| 1139 | {
|
---|
| 1140 | BvhInterior *interior = static_cast<BvhInterior *>(node);
|
---|
| 1141 |
|
---|
| 1142 | BvhNode *f = interior->mFront;
|
---|
| 1143 | BvhNode *b = interior->mBack;
|
---|
| 1144 |
|
---|
[3064] | 1145 | if (node->mIsMaxDepthForVirtualLeaf ||
|
---|
| 1146 | (CountTriangles(node) <= numTriangles))
|
---|
[2761] | 1147 | {
|
---|
[3267] | 1148 | //cout << " l " << CountTriangles(node) << " " << node->mIsMaxDepthForVirtualLeaf << endl;
|
---|
[3266] | 1149 | node->mIsVirtualLeaf = true;
|
---|
[2761] | 1150 | }
|
---|
| 1151 | else
|
---|
| 1152 | {
|
---|
| 1153 | nodeStack.push(interior->mBack);
|
---|
| 1154 | nodeStack.push(interior->mFront);
|
---|
| 1155 | }
|
---|
| 1156 | }
|
---|
| 1157 | }
|
---|
[2800] | 1158 |
|
---|
[3064] | 1159 | /// Reset the node states
|
---|
[2800] | 1160 | ResetNodeClassifications();
|
---|
[2761] | 1161 | }
|
---|
| 1162 |
|
---|
| 1163 |
|
---|
[3072] | 1164 | void Bvh::ComputeMaxDepthForVirtualLeaves()
|
---|
[2761] | 1165 | {
|
---|
[3072] | 1166 | // We initialize the maximal depth for virtual leaves
|
---|
[3064] | 1167 | // of this bvh, i.e., the nodes that are used as
|
---|
| 1168 | // leaves of the hierarchy during traversal.
|
---|
| 1169 |
|
---|
| 1170 | // Initially they are set either
|
---|
| 1171 | // a) to the real leaves of the hierarchy or
|
---|
| 1172 | // b) the point where the subdivision on object level ends
|
---|
| 1173 | // and the subsequent nodes are just used to provide tighter bounds
|
---|
| 1174 | // (see article for the notations)
|
---|
| 1175 |
|
---|
[2761] | 1176 | std::stack<BvhNode *> nodeStack;
|
---|
| 1177 |
|
---|
[3267] | 1178 | nodeStack.push(mStaticRoot);
|
---|
| 1179 | nodeStack.push(mDynamicRoot);
|
---|
| 1180 |
|
---|
[2761] | 1181 | while (!nodeStack.empty())
|
---|
| 1182 | {
|
---|
| 1183 | BvhNode *node = nodeStack.top();
|
---|
| 1184 | nodeStack.pop();
|
---|
[3267] | 1185 |
|
---|
[2761] | 1186 | if (node->IsLeaf())
|
---|
| 1187 | {
|
---|
| 1188 | node->mIsMaxDepthForVirtualLeaf = true;
|
---|
| 1189 | }
|
---|
| 1190 | else
|
---|
| 1191 | {
|
---|
| 1192 | BvhInterior *interior = static_cast<BvhInterior *>(node);
|
---|
| 1193 |
|
---|
| 1194 | BvhNode *f = interior->mFront;
|
---|
| 1195 | BvhNode *b = interior->mBack;
|
---|
| 1196 |
|
---|
| 1197 | if ((f->mFirst == b->mFirst) && (f->mLast == b->mLast))
|
---|
| 1198 | {
|
---|
[3064] | 1199 | // point reached where beyond there would be no further reduction
|
---|
| 1200 | // as both subtrees contain the same objects => stop here
|
---|
| 1201 | // The tree beyond the current node is used to describe
|
---|
| 1202 | // tighter bounds on the geometry contained in it
|
---|
[2761] | 1203 | node->mIsMaxDepthForVirtualLeaf = true;
|
---|
| 1204 | }
|
---|
| 1205 | else
|
---|
| 1206 | {
|
---|
| 1207 | nodeStack.push(f);
|
---|
| 1208 | nodeStack.push(b);
|
---|
| 1209 | }
|
---|
| 1210 | }
|
---|
| 1211 | }
|
---|
| 1212 | }
|
---|
| 1213 |
|
---|
| 1214 |
|
---|
[3072] | 1215 | // this function must be called once after hierarchy creation
|
---|
| 1216 | void Bvh::PostProcess()
|
---|
| 1217 | {
|
---|
| 1218 | CreateRoot();
|
---|
| 1219 |
|
---|
| 1220 | ComputeMaxDepthForVirtualLeaves();
|
---|
| 1221 | // set virtual leaves for specified number of triangles
|
---|
| 1222 | SetVirtualLeaves(INITIAL_TRIANGLES_PER_VIRTUAL_LEAVES);
|
---|
| 1223 | /// for each node compute the number of leaves under this node
|
---|
| 1224 | UpdateNumLeaves(mRoot);
|
---|
[3074] | 1225 | // compute new ids
|
---|
| 1226 | ComputeIds();
|
---|
[3072] | 1227 | // specify bounds for occlusion tests
|
---|
| 1228 | RecomputeBounds();
|
---|
| 1229 |
|
---|
[3074] | 1230 | mBox = mRoot->GetBox();
|
---|
| 1231 |
|
---|
[3244] | 1232 | // compute and print stats for whole (static + dynamic) bvh
|
---|
[3072] | 1233 | ComputeBvhStats(mRoot, mBvhStats);
|
---|
| 1234 |
|
---|
[3266] | 1235 | BvhStats staticBvhStats;
|
---|
[3267] | 1236 | ComputeBvhStats(mStaticRoot, staticBvhStats);
|
---|
[3266] | 1237 | cout << "\n============ Static BVH statistics =============" << endl;
|
---|
| 1238 |
|
---|
| 1239 | PrintBvhStats(staticBvhStats, mStaticRoot);
|
---|
| 1240 |
|
---|
[3244] | 1241 | // also output dynamic stats
|
---|
[3072] | 1242 | if (mDynamicGeometrySize)
|
---|
| 1243 | {
|
---|
[3266] | 1244 | BvhStats dynBvhStats;
|
---|
| 1245 | ComputeBvhStats(mDynamicRoot, dynBvhStats);
|
---|
| 1246 |
|
---|
[3072] | 1247 | cout << "\n=========== Dynamic BVH statistics: =========" << endl;
|
---|
[3266] | 1248 | PrintBvhStats(dynBvhStats, mDynamicRoot);
|
---|
[3072] | 1249 | }
|
---|
| 1250 | }
|
---|
| 1251 |
|
---|
| 1252 |
|
---|
[2763] | 1253 | void Bvh::RenderBoundingBoxImmediate(const AxisAlignedBox3 &box)
|
---|
| 1254 | {
|
---|
| 1255 | const Vector3 l = box.Min();
|
---|
| 1256 | const Vector3 u = box.Max();
|
---|
| 1257 |
|
---|
[3065] | 1258 | ///////////
|
---|
| 1259 | //-- render AABB as triangle strips
|
---|
| 1260 |
|
---|
[2764] | 1261 | glBegin(GL_TRIANGLE_STRIP);
|
---|
[2763] | 1262 |
|
---|
[3065] | 1263 | // render first half of AABB
|
---|
| 1264 | glVertex3f(l.x, l.y, u.z);
|
---|
| 1265 | glVertex3f(u.x, l.y, u.z);
|
---|
| 1266 | glVertex3f(l.x, u.y, u.z);
|
---|
| 1267 | glVertex3f(u.x, u.y, u.z);
|
---|
| 1268 | glVertex3f(l.x, u.y, l.z);
|
---|
| 1269 | glVertex3f(u.x, u.y, l.z);
|
---|
| 1270 | glVertex3f(l.x, l.y, l.z);
|
---|
| 1271 | glVertex3f(u.x, l.y, l.z);
|
---|
[2763] | 1272 |
|
---|
[3065] | 1273 | glPrimitiveRestartNV();
|
---|
[2763] | 1274 |
|
---|
[3065] | 1275 | // render second half of AABB
|
---|
| 1276 | glVertex3f(l.x, u.y, u.z);
|
---|
| 1277 | glVertex3f(l.x, u.y, l.z);
|
---|
| 1278 | glVertex3f(l.x, l.y, u.z);
|
---|
| 1279 | glVertex3f(l.x, l.y, l.z);
|
---|
| 1280 | glVertex3f(u.x, l.y, u.z);
|
---|
| 1281 | glVertex3f(u.x, l.y, l.z);
|
---|
| 1282 | glVertex3f(u.x, u.y, u.z);
|
---|
| 1283 | glVertex3f(u.x, u.y, l.z);
|
---|
| 1284 |
|
---|
[2764] | 1285 | glEnd();
|
---|
[2761] | 1286 | }
|
---|
[2763] | 1287 |
|
---|
[2790] | 1288 |
|
---|
| 1289 | static void RenderBoxForViz(const AxisAlignedBox3 &box)
|
---|
| 1290 | {
|
---|
| 1291 | glBegin(GL_LINE_LOOP);
|
---|
| 1292 | glVertex3d(box.Min().x, box.Max().y, box.Min().z);
|
---|
| 1293 | glVertex3d(box.Max().x, box.Max().y, box.Min().z);
|
---|
| 1294 | glVertex3d(box.Max().x, box.Min().y, box.Min().z);
|
---|
| 1295 | glVertex3d(box.Min().x, box.Min().y, box.Min().z);
|
---|
| 1296 | glEnd();
|
---|
| 1297 |
|
---|
| 1298 | glBegin(GL_LINE_LOOP);
|
---|
| 1299 | glVertex3d(box.Min().x, box.Min().y, box.Max().z);
|
---|
| 1300 | glVertex3d(box.Max().x, box.Min().y, box.Max().z);
|
---|
| 1301 | glVertex3d(box.Max().x, box.Max().y, box.Max().z);
|
---|
| 1302 | glVertex3d(box.Min().x, box.Max().y, box.Max().z);
|
---|
| 1303 | glEnd();
|
---|
| 1304 |
|
---|
| 1305 | glBegin(GL_LINE_LOOP);
|
---|
| 1306 | glVertex3d(box.Max().x, box.Min().y, box.Min().z);
|
---|
| 1307 | glVertex3d(box.Max().x, box.Min().y, box.Max().z);
|
---|
| 1308 | glVertex3d(box.Max().x, box.Max().y, box.Max().z);
|
---|
| 1309 | glVertex3d(box.Max().x, box.Max().y, box.Min().z);
|
---|
| 1310 | glEnd();
|
---|
| 1311 |
|
---|
| 1312 | glBegin(GL_LINE_LOOP);
|
---|
| 1313 | glVertex3d(box.Min().x, box.Min().y, box.Min().z);
|
---|
| 1314 | glVertex3d(box.Min().x, box.Min().y, box.Max().z);
|
---|
| 1315 | glVertex3d(box.Min().x, box.Max().y, box.Max().z);
|
---|
| 1316 | glVertex3d(box.Min().x, box.Max().y, box.Min().z);
|
---|
| 1317 | glEnd();
|
---|
| 1318 |
|
---|
| 1319 | glBegin(GL_LINE_LOOP);
|
---|
| 1320 | glVertex3d(box.Min().x, box.Min().y, box.Min().z);
|
---|
| 1321 | glVertex3d(box.Max().x, box.Min().y, box.Min().z);
|
---|
| 1322 | glVertex3d(box.Max().x, box.Min().y, box.Max().z);
|
---|
| 1323 | glVertex3d(box.Min().x, box.Min().y, box.Max().z);
|
---|
| 1324 | glEnd();
|
---|
| 1325 |
|
---|
| 1326 | glBegin(GL_LINE_LOOP);
|
---|
| 1327 | glVertex3d(box.Min().x, box.Max().y, box.Min().z);
|
---|
| 1328 | glVertex3d(box.Max().x, box.Max().y, box.Min().z);
|
---|
| 1329 | glVertex3d(box.Max().x, box.Max().y, box.Max().z);
|
---|
| 1330 | glVertex3d(box.Min().x, box.Max().y, box.Max().z);
|
---|
| 1331 |
|
---|
| 1332 | glEnd();
|
---|
| 1333 | }
|
---|
| 1334 |
|
---|
| 1335 |
|
---|
[3066] | 1336 | static Technique GetVizTechnique()
|
---|
| 1337 | {
|
---|
| 1338 | Technique tech;
|
---|
| 1339 | tech.Init();
|
---|
| 1340 |
|
---|
| 1341 | //tech.SetLightingEnabled(false);
|
---|
| 1342 | //tech.SetDepthWriteEnabled(false);
|
---|
| 1343 |
|
---|
| 1344 | tech.SetEmmisive(RgbaColor(1.0f, 1.0f, 1.0f, 1.0f));
|
---|
| 1345 | tech.SetDiffuse(RgbaColor(1.0f, 1.0f, 1.0f, 1.0f));
|
---|
| 1346 | tech.SetAmbient(RgbaColor(1.0f, 1.0f, 1.0f, 1.0f));
|
---|
| 1347 |
|
---|
| 1348 | return tech;
|
---|
| 1349 | }
|
---|
| 1350 |
|
---|
| 1351 |
|
---|
[3064] | 1352 | void Bvh::RenderBoundsForViz(BvhNode *node,
|
---|
| 1353 | RenderState *state,
|
---|
| 1354 | bool useTightBounds)
|
---|
[2790] | 1355 | {
|
---|
[3066] | 1356 | Technique *oldTech = state->GetState();
|
---|
| 1357 | // we set a simple material
|
---|
| 1358 | static Technique boxMat = GetVizTechnique();
|
---|
[2825] | 1359 | boxMat.Render(state);
|
---|
| 1360 |
|
---|
[2790] | 1361 | if (!useTightBounds)
|
---|
| 1362 | {
|
---|
[3245] | 1363 | #if 1
|
---|
[3066] | 1364 | RenderBoxForViz(node->GetBox());
|
---|
[3245] | 1365 | #else
|
---|
| 1366 | glPolygonMode(GL_FRONT, GL_LINE);
|
---|
[3065] | 1367 | RenderBoundingBoxImmediate(node->GetBox());
|
---|
[3245] | 1368 | glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
|
---|
| 1369 | #endif
|
---|
[2790] | 1370 | }
|
---|
| 1371 | else
|
---|
| 1372 | {
|
---|
[3203] | 1373 | for (int i = 0; i < node->mNumTestNodes; ++ i)
|
---|
[2790] | 1374 | {
|
---|
| 1375 | RenderBoxForViz(mTestNodes[node->mTestNodesIdx + i]->GetBox());
|
---|
[3203] | 1376 | }
|
---|
[2790] | 1377 | }
|
---|
[3066] | 1378 |
|
---|
| 1379 | if (oldTech) oldTech->Render(state);
|
---|
[2790] | 1380 | }
|
---|
| 1381 |
|
---|
| 1382 |
|
---|
| 1383 |
|
---|
[3053] | 1384 |
|
---|
[3266] | 1385 | bool Bvh::IntersectsNearPlane(BvhNode *node) const
|
---|
| 1386 | {
|
---|
| 1387 | // note: we have problems with large scale object penetrating the near plane
|
---|
| 1388 | // (e.g., objects in the distance which are always handled to be visible)
|
---|
| 1389 | // especially annoying is this problem when using the frustum
|
---|
| 1390 | // fitting on the visible objects for shadow mapping
|
---|
| 1391 | // but don't see how to solve this issue without using costly calculations
|
---|
| 1392 |
|
---|
| 1393 | // we stored the near plane distance => we can use it also here
|
---|
| 1394 | float distanceToNearPlane = node->GetDistance();
|
---|
| 1395 | //float distanceToNearPlane = node->GetBox().GetMinDistance(sNearPlane);
|
---|
| 1396 |
|
---|
| 1397 | return (distanceToNearPlane < sNear);
|
---|
[3053] | 1398 | }
|
---|
| 1399 |
|
---|
| 1400 |
|
---|
[3266] | 1401 | void Bvh::CreateRoot()
|
---|
[3053] | 1402 | {
|
---|
[3266] | 1403 | // create new root
|
---|
| 1404 | mRoot = new BvhInterior(NULL);
|
---|
[3053] | 1405 |
|
---|
[3266] | 1406 | // the separation is a purely logical one
|
---|
| 1407 | // the bounding boxes of the child nodes are
|
---|
| 1408 | // identical to those of the root node
|
---|
[3053] | 1409 |
|
---|
[3266] | 1410 | mRoot->mBox = mStaticRoot->mBox;
|
---|
| 1411 | mRoot->mBox.Include(mDynamicRoot->mBox);
|
---|
[3064] | 1412 |
|
---|
[3266] | 1413 | mRoot->mArea = mRoot->mBox.SurfaceArea();
|
---|
[3053] | 1414 |
|
---|
[3266] | 1415 | mRoot->mFirst = 0;
|
---|
| 1416 | mRoot->mLast = (int)mGeometrySize - 1;
|
---|
[3070] | 1417 |
|
---|
[3266] | 1418 | //cout<<"f: " << mRoot->mFirst<< " l: " <<mRoot->mLast << endl;
|
---|
| 1419 | // add static root on left subtree
|
---|
| 1420 | mRoot->mFront = mStaticRoot;
|
---|
| 1421 | mStaticRoot->mParent = mRoot;
|
---|
[3053] | 1422 |
|
---|
[3266] | 1423 | // add dynamic root on left subtree
|
---|
| 1424 | mRoot->mBack = mDynamicRoot;
|
---|
| 1425 | mDynamicRoot->mParent = mRoot;
|
---|
[3053] | 1426 | }
|
---|
[3266] | 1427 |
|
---|
[3053] | 1428 |
|
---|
| 1429 |
|
---|
| 1430 |
|
---|
[3266] | 1431 | ////////////////////////
|
---|
| 1432 | //-- dynamic hierarchy stuff
|
---|
[3053] | 1433 |
|
---|
| 1434 |
|
---|
[3267] | 1435 | void Bvh::UpdateBoundingBoxes(BvhNode *node)
|
---|
[3053] | 1436 | {
|
---|
[3070] | 1437 | if (node->IsLeaf())
|
---|
| 1438 | {
|
---|
| 1439 | int numEntities;
|
---|
| 1440 | SceneEntity **entities = GetGeometry(node, numEntities);
|
---|
| 1441 |
|
---|
[3262] | 1442 | node->mBox = SceneEntity::ComputeBoundingBox(entities, numEntities);
|
---|
[3070] | 1443 | //cout << "box: " << node->mBox << endl;
|
---|
| 1444 | }
|
---|
| 1445 | else
|
---|
| 1446 | {
|
---|
| 1447 | BvhNode *f = static_cast<BvhInterior *>(node)->GetFront();
|
---|
| 1448 | BvhNode *b = static_cast<BvhInterior *>(node)->GetBack();
|
---|
| 1449 |
|
---|
[3267] | 1450 | UpdateBoundingBoxes(f);
|
---|
| 1451 | UpdateBoundingBoxes(b);
|
---|
[3070] | 1452 |
|
---|
| 1453 | node->mBox = f->mBox;
|
---|
| 1454 | node->mBox.Include(b->mBox);
|
---|
| 1455 | }
|
---|
| 1456 | }
|
---|
| 1457 |
|
---|
| 1458 |
|
---|
| 1459 | void Bvh::CreateDynamicBranch()
|
---|
| 1460 | {
|
---|
[3069] | 1461 | // the bvh has two main branches
|
---|
[3262] | 1462 | // a static branch (the old root), and a dynamic branch
|
---|
[3069] | 1463 | // we create a 'dynamic' leaf which basically is a container
|
---|
| 1464 | // for all dynamic objects underneath
|
---|
| 1465 |
|
---|
| 1466 | // the bounding boxes of the dynamic tree must be updated
|
---|
| 1467 | // once each frame in order to be able to incorporate
|
---|
| 1468 | // the movements of the objects within
|
---|
| 1469 |
|
---|
[3269] | 1470 |
|
---|
| 1471 | cout << "\n==============================" << endl;
|
---|
[3264] | 1472 | cout << "creating dynamic bvh branch" << endl;
|
---|
| 1473 |
|
---|
[3069] | 1474 | DEL_PTR(mDynamicRoot);
|
---|
[3264] | 1475 | -- mNumNodes;
|
---|
[3053] | 1476 |
|
---|
[3264] | 1477 | BvhConstructor bvhConstructor(mGeometry, (int)mStaticGeometrySize, (int)mGeometrySize - 1);
|
---|
| 1478 |
|
---|
| 1479 | int numNodes;
|
---|
| 1480 | mDynamicRoot = bvhConstructor.Construct(numNodes);
|
---|
| 1481 |
|
---|
| 1482 | mNumNodes += numNodes;
|
---|
[3053] | 1483 | }
|
---|
| 1484 |
|
---|
[3267] | 1485 |
|
---|
| 1486 |
|
---|
| 1487 |
|
---|
[2764] | 1488 | } |
---|