void PhotonMapping::setupVBOs() {
HandleGLError("enter photonmapping setupvbos()");
photon_direction_verts.clear();
photon_direction_indices.clear();
kdtree_verts.clear();
kdtree_edge_indices.clear();
// initialize the data
BoundingBox *bb = mesh->getBoundingBox();
float max_dim = bb->maxDim();
if (kdtree == NULL) return;
std::vector<const KDTree*> todo;
todo.push_back(kdtree);
while (!todo.empty()) {
const KDTree *node = todo.back();
todo.pop_back();
if (node->isLeaf()) {
// initialize photon direction vbo
const std::vector<Photon> &photons = node->getPhotons();
int num_photons = photons.size();
for (int i = 0; i < num_photons; i++) {
const Photon &p = photons[i];
glm::vec3 energy = p.getEnergy()*float(args->num_photons_to_shoot);
glm::vec4 color(energy.x,energy.y,energy.z,1);
const glm::vec3 &position = p.getPosition();
glm::vec3 other = position - p.getDirectionFrom()*0.02f*max_dim;
addEdgeGeometry(photon_direction_verts,photon_direction_indices,
position,other,color,color,max_dim*0.0005f,0);
}
// initialize kdtree vbo
float thickness = 0.001*max_dim;
glm::vec3 A = node->getMin();
glm::vec3 B = node->getMax();
glm::vec4 black(1,0,0,1);
addEdgeGeometry(kdtree_verts,kdtree_edge_indices,glm::vec3(A.x,A.y,A.z),glm::vec3(A.x,A.y,B.z),black,black,thickness,thickness);
addEdgeGeometry(kdtree_verts,kdtree_edge_indices,glm::vec3(A.x,A.y,B.z),glm::vec3(A.x,B.y,B.z),black,black,thickness,thickness);
addEdgeGeometry(kdtree_verts,kdtree_edge_indices,glm::vec3(A.x,B.y,B.z),glm::vec3(A.x,B.y,A.z),black,black,thickness,thickness);
addEdgeGeometry(kdtree_verts,kdtree_edge_indices,glm::vec3(A.x,B.y,A.z),glm::vec3(A.x,A.y,A.z),black,black,thickness,thickness);
addEdgeGeometry(kdtree_verts,kdtree_edge_indices,glm::vec3(B.x,A.y,A.z),glm::vec3(B.x,A.y,B.z),black,black,thickness,thickness);
addEdgeGeometry(kdtree_verts,kdtree_edge_indices,glm::vec3(B.x,A.y,B.z),glm::vec3(B.x,B.y,B.z),black,black,thickness,thickness);
addEdgeGeometry(kdtree_verts,kdtree_edge_indices,glm::vec3(B.x,B.y,B.z),glm::vec3(B.x,B.y,A.z),black,black,thickness,thickness);
addEdgeGeometry(kdtree_verts,kdtree_edge_indices,glm::vec3(B.x,B.y,A.z),glm::vec3(B.x,A.y,A.z),black,black,thickness,thickness);
addEdgeGeometry(kdtree_verts,kdtree_edge_indices,glm::vec3(A.x,A.y,A.z),glm::vec3(B.x,A.y,A.z),black,black,thickness,thickness);
addEdgeGeometry(kdtree_verts,kdtree_edge_indices,glm::vec3(A.x,A.y,B.z),glm::vec3(B.x,A.y,B.z),black,black,thickness,thickness);
addEdgeGeometry(kdtree_verts,kdtree_edge_indices,glm::vec3(A.x,B.y,B.z),glm::vec3(B.x,B.y,B.z),black,black,thickness,thickness);
addEdgeGeometry(kdtree_verts,kdtree_edge_indices,glm::vec3(A.x,B.y,A.z),glm::vec3(B.x,B.y,A.z),black,black,thickness,thickness);
} else {
todo.push_back(node->getChild1());
todo.push_back(node->getChild2());
}
}
// copy the data to each VBO
if (photon_direction_verts.size() > 0) {
glBindBuffer(GL_ARRAY_BUFFER,photon_direction_verts_VBO);
glBufferData(GL_ARRAY_BUFFER,
sizeof(VBOPosNormalColor) * photon_direction_verts.size(),
&photon_direction_verts[0],
GL_STATIC_DRAW);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER,photon_direction_indices_VBO);
glBufferData(GL_ELEMENT_ARRAY_BUFFER,
sizeof(VBOIndexedTri) * photon_direction_indices.size(),
&photon_direction_indices[0], GL_STATIC_DRAW);
}
if (kdtree_verts.size() > 0) {
glBindBuffer(GL_ARRAY_BUFFER,kdtree_verts_VBO);
glBufferData(GL_ARRAY_BUFFER,
sizeof(VBOPosNormalColor) * kdtree_verts.size(),
&kdtree_verts[0],
GL_STATIC_DRAW);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER,kdtree_edge_indices_VBO);
glBufferData(GL_ELEMENT_ARRAY_BUFFER,
sizeof(VBOIndexedTri) * kdtree_edge_indices.size(),
&kdtree_edge_indices[0], GL_STATIC_DRAW);
}
HandleGLError("leave photonmapping setupvbos()");
}
void BoundingBox::setupVBOs() {
HandleGLError("bounding box setup VBOs enter");
float thickness = 0.001*glm::length(maximum-minimum);
glm::vec3& A = minimum;
glm::vec3& B = maximum;
glm::vec4 black(0,0,0,1);
addEdgeGeometry(bb_verts,bb_tri_indices,glm::vec3(A.x,A.y,A.z),glm::vec3(A.x,A.y,B.z),black,black,thickness,thickness);
addEdgeGeometry(bb_verts,bb_tri_indices,glm::vec3(A.x,A.y,B.z),glm::vec3(A.x,B.y,B.z),black,black,thickness,thickness);
addEdgeGeometry(bb_verts,bb_tri_indices,glm::vec3(A.x,B.y,B.z),glm::vec3(A.x,B.y,A.z),black,black,thickness,thickness);
addEdgeGeometry(bb_verts,bb_tri_indices,glm::vec3(A.x,B.y,A.z),glm::vec3(A.x,A.y,A.z),black,black,thickness,thickness);
addEdgeGeometry(bb_verts,bb_tri_indices,glm::vec3(B.x,A.y,A.z),glm::vec3(B.x,A.y,B.z),black,black,thickness,thickness);
addEdgeGeometry(bb_verts,bb_tri_indices,glm::vec3(B.x,A.y,B.z),glm::vec3(B.x,B.y,B.z),black,black,thickness,thickness);
addEdgeGeometry(bb_verts,bb_tri_indices,glm::vec3(B.x,B.y,B.z),glm::vec3(B.x,B.y,A.z),black,black,thickness,thickness);
addEdgeGeometry(bb_verts,bb_tri_indices,glm::vec3(B.x,B.y,A.z),glm::vec3(B.x,A.y,A.z),black,black,thickness,thickness);
addEdgeGeometry(bb_verts,bb_tri_indices,glm::vec3(A.x,A.y,A.z),glm::vec3(B.x,A.y,A.z),black,black,thickness,thickness);
addEdgeGeometry(bb_verts,bb_tri_indices,glm::vec3(A.x,A.y,B.z),glm::vec3(B.x,A.y,B.z),black,black,thickness,thickness);
addEdgeGeometry(bb_verts,bb_tri_indices,glm::vec3(A.x,B.y,B.z),glm::vec3(B.x,B.y,B.z),black,black,thickness,thickness);
addEdgeGeometry(bb_verts,bb_tri_indices,glm::vec3(A.x,B.y,A.z),glm::vec3(B.x,B.y,A.z),black,black,thickness,thickness);
glBindBuffer(GL_ARRAY_BUFFER,bb_verts_VBO);
glBufferData(GL_ARRAY_BUFFER,sizeof(VBOPosNormalColor)*bb_verts.size(),&bb_verts[0],GL_STATIC_DRAW);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER,bb_tri_indices_VBO);
glBufferData(GL_ELEMENT_ARRAY_BUFFER,sizeof(VBOIndexedTri)*bb_tri_indices.size(),&bb_tri_indices[0],GL_STATIC_DRAW);
HandleGLError("bounding box setup VBOs finished");
}
