[492] | 1 | #include "Mesh.h"
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| 2 | #include "GlRenderer.h"
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| 3 | #include "ViewCellsManager.h"
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| 4 | #include "SceneGraph.h"
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| 5 | #include "Pvs.h"
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| 6 | #include "Viewcell.h"
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| 7 |
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| 8 | #include <GL/glext.h>
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| 9 |
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| 10 | GlRenderer *renderer = NULL;
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| 11 |
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| 12 | #ifdef _WIN32
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| 13 | PFNGLGENOCCLUSIONQUERIESNVPROC glGenOcclusionQueriesNV;
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| 14 | PFNGLBEGINOCCLUSIONQUERYNVPROC glBeginOcclusionQueryNV;
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| 15 | PFNGLENDOCCLUSIONQUERYNVPROC glEndOcclusionQueryNV;
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| 16 | PFNGLGETOCCLUSIONQUERYUIVNVPROC glGetOcclusionQueryuivNV;
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| 17 | #endif
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| 18 |
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| 19 | GlRenderer::GlRenderer(SceneGraph *sceneGraph,
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| 20 | ViewCellsManager *viewCellsManager):
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| 21 | QGLWidget(),
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| 22 | mSceneGraph(sceneGraph),
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| 23 | mViewCellsManager(viewCellsManager)
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| 24 | {
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| 25 | mSceneGraph->CollectObjects(&mObjects);
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| 26 | mViewPoint = mSceneGraph->GetBox().Center();
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| 27 | mViewDirection = Vector3(0,0,1);
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| 28 | mRender = true;
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| 29 |
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| 30 | // timerId = startTimer(10);
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| 31 | mFrame = 0;
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| 32 | mPvsStatFrames = 10000;
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| 33 | mPvsErrorBuffer.resize(mPvsStatFrames);
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| 34 | ClearErrorBuffer();
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| 35 | pbuffer = NULL;
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| 36 | }
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| 37 |
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| 38 | GlRenderer::~GlRenderer()
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| 39 | {
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| 40 | if (pbuffer)
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| 41 | delete pbuffer;
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| 42 | }
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| 43 |
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| 44 | void
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| 45 | GlRenderer::RenderIntersectable(Intersectable *object)
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| 46 | {
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| 47 |
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| 48 | SetupFalseColor(object->mId);
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| 49 |
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| 50 | switch (object->Type()) {
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| 51 | case Intersectable::MESH_INSTANCE:
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| 52 | RenderMeshInstance((MeshInstance *)object);
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| 53 | break;
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| 54 | default:
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| 55 | cerr<<"Rendering this object not yet implemented\n";
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| 56 | break;
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| 57 | }
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| 58 | }
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| 59 |
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| 60 |
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| 61 | void
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| 62 | GlRenderer::RenderMeshInstance(MeshInstance *mi)
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| 63 | {
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| 64 | RenderMesh(mi->GetMesh());
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| 65 | }
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| 66 |
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| 67 | void
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| 68 | GlRenderer::SetupFalseColor(const int id)
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| 69 | {
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| 70 | // swap bits of the color
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| 71 |
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| 72 | glColor3ub(id&255, (id>>8)&255, (id>>16)&255);
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| 73 | }
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| 74 |
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| 75 | void
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| 76 | GlRenderer::SetupMaterial(Material *m)
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| 77 | {
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| 78 | if (m)
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| 79 | glColor3fv(&(m->mDiffuseColor.r));
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| 80 | else
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| 81 | glColor3f(1.0f, 1.0f, 1.0f);
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| 82 | }
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| 83 |
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| 84 | void
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| 85 | GlRenderer::RenderMesh(Mesh *mesh)
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| 86 | {
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| 87 | int i = 0;
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| 88 |
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| 89 | if (!mUseFalseColors)
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| 90 | SetupMaterial(mesh->mMaterial);
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| 91 |
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| 92 | for (i=0; i < mesh->mFaces.size(); i++) {
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| 93 | glBegin(GL_POLYGON);
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| 94 | Face *face = mesh->mFaces[i];
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| 95 | for (int j = 0; j < face->mVertexIndices.size(); j++) {
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| 96 | glVertex3fv(&mesh->mVertices[face->mVertexIndices[j]].x);
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| 97 | }
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| 98 | glEnd();
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| 99 | }
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| 100 | }
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| 101 |
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| 102 | void
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| 103 | GlRenderer::initializeGL()
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| 104 | {
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| 105 | glMatrixMode(GL_PROJECTION);
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| 106 | glLoadIdentity();
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| 107 |
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| 108 | glMatrixMode(GL_MODELVIEW);
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| 109 | glLoadIdentity();
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| 110 |
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| 111 | glEnable(GL_CULL_FACE);
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| 112 | glShadeModel(GL_FLAT);
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| 113 | glEnable(GL_DEPTH_TEST);
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| 114 | glEnable(GL_CULL_FACE);
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| 115 |
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| 116 | glGenOcclusionQueriesNV = (PFNGLGENOCCLUSIONQUERIESNVPROC)
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| 117 | wglGetProcAddress("glGenOcclusionQueriesNV");
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| 118 | glBeginOcclusionQueryNV = (PFNGLBEGINOCCLUSIONQUERYNVPROC)
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| 119 | wglGetProcAddress("glBeginOcclusionQueryNV");
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| 120 | glEndOcclusionQueryNV = (PFNGLENDOCCLUSIONQUERYNVPROC)
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| 121 | wglGetProcAddress("glEndOcclusionQueryNV");
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| 122 | glGetOcclusionQueryuivNV = (PFNGLGETOCCLUSIONQUERYUIVNVPROC)
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| 123 | wglGetProcAddress("glGetOcclusionQueryuivNV");
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| 124 | }
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| 125 |
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| 126 | void
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| 127 | GlRenderer::resizeGL(int w, int h)
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| 128 | {
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| 129 | SetupProjection(w, h);
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| 130 |
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| 131 | if (pbuffer == NULL || pbuffer->size().width() != w || pbuffer->size().height() != h) {
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| 132 | if (pbuffer)
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| 133 | delete pbuffer;
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[494] | 134 | pbuffer = new QGLPixelBuffer(QSize(w,h));
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[492] | 135 | }
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| 136 |
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| 137 | updateGL();
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| 138 | }
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| 139 |
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| 140 |
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| 141 | void
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| 142 | GlRenderer::SetupProjection(const int w, const int h)
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| 143 | {
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| 144 | glViewport(0, 0, w, h);
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| 145 | glMatrixMode(GL_PROJECTION);
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| 146 | glLoadIdentity();
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| 147 | gluPerspective(70.0, 1.0, 0.1, 2.0*Magnitude(mSceneGraph->GetBox().Diagonal()));
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| 148 | glMatrixMode(GL_MODELVIEW);
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| 149 | }
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| 150 |
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| 151 | void
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| 152 | GlRenderer::SetupCamera()
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| 153 | {
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| 154 | Vector3 target = mViewPoint + mViewDirection;
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| 155 | Vector3 up(0,1,0);
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| 156 |
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| 157 | glLoadIdentity();
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| 158 | gluLookAt(mViewPoint.x, mViewPoint.y, mViewPoint.z,
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| 159 | target.x, target.y, target.z,
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| 160 | up.x, up.y, up.z);
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| 161 | }
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| 162 |
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| 163 | void
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| 164 | GlRenderer::RandomViewPoint()
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| 165 | {
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| 166 | Vector3 pVector = Vector3(halton.GetNumber(1),
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| 167 | halton.GetNumber(2),
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| 168 | halton.GetNumber(3));
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| 169 |
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| 170 | Vector3 dVector = Vector3(2*M_PI*halton.GetNumber(4),
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| 171 | M_PI*halton.GetNumber(5),
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| 172 | 0.0f);
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| 173 |
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| 174 | mViewPoint = mSceneGraph->GetBox().GetPoint(pVector);
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| 175 |
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| 176 | mViewDirection = Normalize(Vector3(sin(dVector.x),
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| 177 | // cos(dVector.y),
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| 178 | 0.0f,
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| 179 | cos(dVector.x)));
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| 180 |
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| 181 | halton.GenerateNext();
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| 182 | }
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| 183 |
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| 184 | void
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| 185 | GlRenderer::paintGL()
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| 186 | {
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| 187 | if (mRender) {
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| 188 | Render();
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| 189 | mFrame++;
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| 190 | }
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| 191 | }
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| 192 |
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| 193 | void
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| 194 | GlRenderer::ClearErrorBuffer()
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| 195 | {
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| 196 | for (int i=0; i < mPvsStatFrames; i++) {
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| 197 | mPvsErrorBuffer[i] = 1.0f;
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| 198 | }
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| 199 | }
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| 200 |
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| 201 | void
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| 202 | GlRenderer::EvalPvsStat()
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| 203 | {
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| 204 | mPvsStat.Reset();
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| 205 | halton.Reset();
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| 206 |
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| 207 | pbuffer->makeCurrent();
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| 208 | initializeGL();
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| 209 | SetupProjection(pbuffer->size().width(), pbuffer->size().height());
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| 210 |
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| 211 | for (int i=0; i < mPvsStatFrames; i++) {
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| 212 | float err;
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| 213 | RandomViewPoint();
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| 214 | if (mPvsErrorBuffer[i] > 0.0f) {
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| 215 | mPvsErrorBuffer[i] = GetPixelError();
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| 216 | cout<<"("<<i<<","<<mPvsErrorBuffer[i]<<")";
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| 217 | // swapBuffers();
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| 218 | }
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| 219 |
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| 220 | err = mPvsErrorBuffer[i];
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| 221 |
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| 222 | if (err >= 0.0f) {
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| 223 | if (err > mPvsStat.maxError)
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| 224 | mPvsStat.maxError = err;
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| 225 | mPvsStat.sumError += err;
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| 226 | if (err == 0.0f)
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| 227 | mPvsStat.errorFreeFrames++;
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| 228 | mPvsStat.frames++;
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| 229 | }
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| 230 | }
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| 231 |
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| 232 | pbuffer->doneCurrent();
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| 233 |
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| 234 | cout<<endl<<flush;
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| 235 | mRenderingFinished.wakeAll();
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| 236 | }
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| 237 |
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| 238 | float
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| 239 | GlRenderer::Render()
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| 240 | {
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| 241 | float pErrorPixels = -1.0f;
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| 242 |
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| 243 | glReadBuffer(GL_BACK);
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| 244 |
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| 245 | mUseFalseColors = true;
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| 246 |
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| 247 | SetupCamera();
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| 248 | glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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| 249 | glEnable( GL_CULL_FACE );
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| 250 |
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| 251 | ObjectContainer::const_iterator oi = mObjects.begin();
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| 252 | for (; oi != mObjects.end(); oi++)
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| 253 | RenderIntersectable(*oi);
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| 254 |
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| 255 | ViewCell *viewcell = mViewCellsManager->GetViewCell(mViewPoint);
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| 256 |
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| 257 | QImage im1, im2;
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| 258 | QImage diff;
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| 259 |
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| 260 | if (viewcell) {
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| 261 | // read back the texture
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| 262 | im1 = grabFrameBuffer(true);
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| 263 |
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| 264 | SetupCamera();
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| 265 | glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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| 266 |
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| 267 | std::map<Intersectable *,
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| 268 | PvsData<Intersectable *>,
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| 269 | LtSample<Intersectable *> >::const_iterator it = viewcell->GetPvs().mEntries.begin();
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| 270 |
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| 271 | for (; it != viewcell->GetPvs().mEntries.end(); ++ it) {
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| 272 | Intersectable *object = (*it).first;
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| 273 | RenderIntersectable(object);
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| 274 | }
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| 275 |
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| 276 | // read back the texture
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| 277 | im2 = grabFrameBuffer(true);
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| 278 |
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| 279 | diff = im1;
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| 280 | int x, y;
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| 281 | int errorPixels = 0;
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| 282 |
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| 283 | for (y = 0; y < im1.height(); y++)
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| 284 | for (x = 0; x < im1.width(); x++)
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| 285 | if (im1.pixel(x, y) == im2.pixel(x, y))
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| 286 | diff.setPixel(x, y, qRgba(0,0,0,0));
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| 287 | else {
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| 288 | diff.setPixel(x, y, qRgba(255,128,128,255));
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| 289 | errorPixels++;
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| 290 | }
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| 291 | pErrorPixels = (100.f*errorPixels)/(im1.height()*im1.width());
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| 292 | }
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| 293 |
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| 294 | // now render the pvs again
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| 295 | SetupCamera();
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| 296 | glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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| 297 | mUseFalseColors = false;
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| 298 |
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| 299 | oi = mObjects.begin();
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| 300 | for (; oi != mObjects.end(); oi++)
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| 301 | RenderIntersectable(*oi);
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| 302 |
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| 303 | // now render im1
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| 304 | if (viewcell) {
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| 305 | // init ortographic projection
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| 306 | glMatrixMode(GL_PROJECTION);
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| 307 | glPushMatrix();
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| 308 |
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| 309 | glLoadIdentity();
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| 310 | gluOrtho2D(0, 1.0f, 0, 1.0f);
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| 311 |
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| 312 | glMatrixMode(GL_MODELVIEW);
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| 313 | glLoadIdentity();
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| 314 |
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| 315 | bindTexture(diff);
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| 316 |
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| 317 | glPushAttrib(GL_ENABLE_BIT);
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| 318 | glEnable( GL_ALPHA_TEST );
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| 319 | glDisable( GL_CULL_FACE );
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| 320 | glAlphaFunc( GL_GREATER, 0.5 );
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| 321 |
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| 322 | glEnable( GL_TEXTURE_2D );
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| 323 | glBegin(GL_QUADS);
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| 324 |
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| 325 | glTexCoord2f(0,0);
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| 326 | glVertex3f(0,0,0);
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| 327 |
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| 328 | glTexCoord2f(1,0);
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| 329 | glVertex3f( 1, 0, 0);
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| 330 |
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| 331 | glTexCoord2f(1,1);
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| 332 | glVertex3f( 1, 1, 0);
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| 333 |
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| 334 | glTexCoord2f(0,1);
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| 335 | glVertex3f(0, 1, 0);
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| 336 | glEnd();
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| 337 |
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| 338 | glPopAttrib();
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| 339 |
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| 340 | // restore the projection matrix
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| 341 | glMatrixMode(GL_PROJECTION);
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| 342 | glPopMatrix();
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| 343 | glMatrixMode(GL_MODELVIEW);
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| 344 | }
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| 345 |
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| 346 | return pErrorPixels;
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| 347 | }
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| 348 |
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| 349 | void
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| 350 | GlRenderer::RenderScene()
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| 351 | {
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| 352 | static int glList = -1;
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| 353 | if (glList != -1) {
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| 354 | glCallList(glList);
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| 355 | } else {
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| 356 | glList = glGenLists(1);
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| 357 | glNewList(glList, GL_COMPILE_AND_EXECUTE);
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| 358 | ObjectContainer::const_iterator oi = mObjects.begin();
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| 359 | for (; oi != mObjects.end(); oi++)
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| 360 | RenderIntersectable(*oi);
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| 361 | glEndList();
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| 362 | }
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| 363 | }
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| 364 |
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| 365 | float
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| 366 | GlRenderer::GetPixelError()
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| 367 | {
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| 368 | float pErrorPixels = -1.0f;
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| 369 |
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| 370 | glReadBuffer(GL_BACK);
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| 371 |
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| 372 | mUseFalseColors = true;
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| 373 |
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| 374 | SetupCamera();
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| 375 | glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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| 376 | glEnable( GL_CULL_FACE );
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| 377 |
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| 378 | RenderScene();
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| 379 |
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| 380 | // now check whether any backfacing polygon would pass the depth test
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| 381 | static int query = -1;
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| 382 | if (query == -1)
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| 383 | glGenOcclusionQueriesNV(1, (unsigned int *)&query);
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| 384 |
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| 385 | glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);
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| 386 | glDepthMask(GL_FALSE);
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| 387 | glDisable( GL_CULL_FACE );
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| 388 |
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| 389 | glBeginOcclusionQueryNV(query);
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| 390 |
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| 391 | RenderScene();
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| 392 |
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| 393 | glEndOcclusionQueryNV();
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| 394 |
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| 395 | // at this point, if possible, go and do some other computation
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| 396 | glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
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| 397 | glDepthMask(GL_TRUE);
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| 398 | glEnable( GL_CULL_FACE );
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| 399 |
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| 400 | unsigned int pixelCount;
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| 401 | // reenable other state
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| 402 | glGetOcclusionQueryuivNV(query,
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| 403 | GL_PIXEL_COUNT_NV,
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| 404 | &pixelCount);
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| 405 |
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| 406 | if (pixelCount > 0)
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| 407 | return -1.0f; // backfacing polygon found -> not a valid viewspace sample
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| 408 |
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| 409 | ViewCell *viewcell = mViewCellsManager->GetViewCell(mViewPoint);
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| 410 |
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| 411 | if (viewcell) {
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| 412 | SetupCamera();
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| 413 | glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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| 414 |
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| 415 | // Render PVS
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| 416 | std::map<Intersectable *,
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| 417 | PvsData<Intersectable *>,
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| 418 | LtSample<Intersectable *> >::const_iterator it = viewcell->GetPvs().mEntries.begin();
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| 419 |
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| 420 | for (; it != viewcell->GetPvs().mEntries.end(); ++ it) {
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| 421 | Intersectable *object = (*it).first;
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| 422 | RenderIntersectable(object);
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| 423 | }
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| 424 |
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| 425 | glBeginOcclusionQueryNV(query);
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| 426 |
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| 427 | SetupCamera();
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| 428 |
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| 429 | RenderScene();
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| 430 |
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| 431 | glEndOcclusionQueryNV();
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| 432 |
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| 433 |
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| 434 | unsigned int pixelCount;
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| 435 | // reenable other state
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| 436 | glGetOcclusionQueryuivNV(query,
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| 437 | GL_PIXEL_COUNT_NV,
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| 438 | &pixelCount);
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| 439 |
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| 440 | pErrorPixels = (100.f*pixelCount)/(height()*width());
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| 441 | }
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| 442 |
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| 443 | return pErrorPixels;
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| 444 | }
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| 445 |
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| 446 |
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| 447 | void
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| 448 | GlRenderer::mousePressEvent(QMouseEvent *e)
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| 449 | {
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| 450 | int x = e->pos().x();
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| 451 | int y = e->pos().y();
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| 452 |
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| 453 | mousePoint.x = x;
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| 454 | mousePoint.y = y;
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| 455 |
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| 456 | }
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| 457 |
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| 458 | void
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| 459 | GlRenderer::mouseMoveEvent(QMouseEvent *e)
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| 460 | {
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| 461 | float MOVE_SENSITIVITY = Magnitude(mSceneGraph->GetBox().Diagonal())*1e-3;
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| 462 | float TURN_SENSITIVITY=0.1f;
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| 463 | float TILT_SENSITIVITY=32.0 ;
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| 464 | float TURN_ANGLE= M_PI/36.0 ;
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| 465 |
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| 466 | int x = e->pos().x();
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| 467 | int y = e->pos().y();
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| 468 |
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| 469 | if (e->modifiers() & Qt::ControlModifier) {
|
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| 470 | mViewPoint.y += (y-mousePoint.y)*MOVE_SENSITIVITY/2.0;
|
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| 471 | mViewPoint.x += (x-mousePoint.x)*MOVE_SENSITIVITY/2.0;
|
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| 472 | } else {
|
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| 473 | mViewPoint += mViewDirection*((mousePoint.y - y)*MOVE_SENSITIVITY);
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| 474 | float adiff = TURN_ANGLE*(x - mousePoint.x)*-TURN_SENSITIVITY;
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| 475 | float angle = atan2(mViewDirection.x, mViewDirection.z);
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| 476 | mViewDirection.x = sin(angle+adiff);
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| 477 | mViewDirection.z = cos(angle+adiff);
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| 478 | }
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| 479 |
|
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| 480 | mousePoint.x = x;
|
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| 481 | mousePoint.y = y;
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| 482 |
|
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| 483 | updateGL();
|
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| 484 | }
|
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| 485 |
|
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| 486 | void
|
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| 487 | GlRenderer::mouseReleaseEvent(QMouseEvent *)
|
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| 488 | {
|
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| 489 |
|
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| 490 |
|
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| 491 | }
|
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