201 lines
6.5 KiB
C++
201 lines
6.5 KiB
C++
#include "Wavefront2GLInstanceGraphicsShape.h"
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#include "../../OpenGLWindow/GLInstancingRenderer.h"
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#include "../../OpenGLWindow/GLInstanceGraphicsShape.h"
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//#include "btBulletDynamicsCommon.h"
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#include "LinearMath/btVector3.h"
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#include "../../OpenGLWindow/SimpleOpenGL3App.h"
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#include "Wavefront2GLInstanceGraphicsShape.h"
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#include "../../OpenGLWindow/GLInstancingRenderer.h"
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#include "../../OpenGLWindow/GLInstanceGraphicsShape.h"
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GLInstanceGraphicsShape* btgCreateGraphicsShapeFromWavefrontObj(const tinyobj::attrib_t& attribute, std::vector<tinyobj::shape_t>& shapes, bool flatShading)
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{
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b3AlignedObjectArray<GLInstanceVertex>* vertices = new b3AlignedObjectArray<GLInstanceVertex>;
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{
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// int numVertices = obj->vertexCount;
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// int numIndices = 0;
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b3AlignedObjectArray<int>* indicesPtr = new b3AlignedObjectArray<int>;
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for (int s = 0; s < (int)shapes.size(); s++)
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{
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tinyobj::shape_t& shape = shapes[s];
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int faceCount = shape.mesh.indices.size();
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for (int f = 0; f < faceCount; f += 3)
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{
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//btVector3 normal(face.m_plane[0],face.m_plane[1],face.m_plane[2]);
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if (1)
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{
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btVector3 normal(0, 1, 0);
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int vtxBaseIndex = vertices->size();
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if (f < 0 && f >= int(shape.mesh.indices.size()))
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{
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continue;
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}
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GLInstanceVertex vtx0;
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tinyobj::index_t v_0 = shape.mesh.indices[f];
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vtx0.xyzw[0] = attribute.vertices[3 * v_0.vertex_index];
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vtx0.xyzw[1] = attribute.vertices[3 * v_0.vertex_index + 1];
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vtx0.xyzw[2] = attribute.vertices[3 * v_0.vertex_index + 2];
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vtx0.xyzw[3] = 0.f;
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if (attribute.texcoords.size())
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{
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int uv0Index = 2 * v_0.texcoord_index;
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int uv1Index = 2 * v_0.texcoord_index + 1;
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if (uv0Index >= 0 && uv1Index >= 0 && (uv0Index < int(attribute.texcoords.size()) && (uv1Index < attribute.texcoords.size())))
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{
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vtx0.uv[0] = attribute.texcoords[uv0Index];
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vtx0.uv[1] = attribute.texcoords[uv1Index];
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}
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else
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{
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// b3Warning("obj texture coordinate out-of-range!");
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vtx0.uv[0] = 0;
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vtx0.uv[1] = 0;
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}
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}
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else
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{
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vtx0.uv[0] = 0.5;
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vtx0.uv[1] = 0.5;
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}
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GLInstanceVertex vtx1;
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tinyobj::index_t v_1 = shape.mesh.indices[f + 1];
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vtx1.xyzw[0] = attribute.vertices[3 * v_1.vertex_index];
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vtx1.xyzw[1] = attribute.vertices[3 * v_1.vertex_index + 1];
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vtx1.xyzw[2] = attribute.vertices[3 * v_1.vertex_index + 2];
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vtx1.xyzw[3] = 0.f;
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if (attribute.texcoords.size())
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{
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int uv0Index = 2 * v_1.texcoord_index;
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int uv1Index = 2 * v_1.texcoord_index + 1;
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if (uv0Index >= 0 && uv1Index >= 0 && (uv0Index < attribute.texcoords.size()) && (uv1Index < attribute.texcoords.size()))
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{
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vtx1.uv[0] = attribute.texcoords[uv0Index];
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vtx1.uv[1] = attribute.texcoords[uv1Index];
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}
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else
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{
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// b3Warning("obj texture coordinate out-of-range!");
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vtx1.uv[0] = 0;
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vtx1.uv[1] = 0;
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}
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}
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else
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{
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vtx1.uv[0] = 0.5f;
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vtx1.uv[1] = 0.5f;
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}
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GLInstanceVertex vtx2;
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tinyobj::index_t v_2 = shape.mesh.indices[f + 2];
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vtx2.xyzw[0] = attribute.vertices[3 * v_2.vertex_index];
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vtx2.xyzw[1] = attribute.vertices[3 * v_2.vertex_index + 1];
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vtx2.xyzw[2] = attribute.vertices[3 * v_2.vertex_index + 2];
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vtx2.xyzw[3] = 0.f;
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if (attribute.texcoords.size())
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{
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int uv0Index = 2 * v_2.texcoord_index;
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int uv1Index = 2 * v_2.texcoord_index + 1;
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if (uv0Index >= 0 && uv1Index >= 0 && (uv0Index < attribute.texcoords.size()) && (uv1Index < attribute.texcoords.size()))
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{
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vtx2.uv[0] = attribute.texcoords[uv0Index];
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vtx2.uv[1] = attribute.texcoords[uv1Index];
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}
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else
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{
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b3Warning("obj texture coordinate out-of-range!");
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vtx2.uv[0] = 0;
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vtx2.uv[1] = 0;
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}
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}
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else
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{
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vtx2.uv[0] = 0.5;
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vtx2.uv[1] = 0.5;
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}
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btVector3 v0(vtx0.xyzw[0], vtx0.xyzw[1], vtx0.xyzw[2]);
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btVector3 v1(vtx1.xyzw[0], vtx1.xyzw[1], vtx1.xyzw[2]);
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btVector3 v2(vtx2.xyzw[0], vtx2.xyzw[1], vtx2.xyzw[2]);
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unsigned int maxIndex = 0;
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unsigned n0Index = shape.mesh.indices[f].normal_index;
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unsigned n1Index = shape.mesh.indices[f + 1].normal_index;
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unsigned n2Index = shape.mesh.indices[f + 2].normal_index;
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maxIndex = b3Max(maxIndex, 3 * n0Index + 0);
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maxIndex = b3Max(maxIndex, 3 * n0Index + 1);
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maxIndex = b3Max(maxIndex, 3 * n0Index + 2);
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maxIndex = b3Max(maxIndex, 3 * n1Index + 0);
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maxIndex = b3Max(maxIndex, 3 * n1Index + 1);
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maxIndex = b3Max(maxIndex, 3 * n1Index + 2);
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maxIndex = b3Max(maxIndex, 3 * n2Index + 0);
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maxIndex = b3Max(maxIndex, 3 * n2Index + 1);
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maxIndex = b3Max(maxIndex, 3 * n2Index + 2);
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bool hasNormals = (attribute.normals.size() && maxIndex < attribute.normals.size());
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if (flatShading || !hasNormals)
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{
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normal = (v1 - v0).cross(v2 - v0);
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btScalar len2 = normal.length2();
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//skip degenerate triangles
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if (len2 > SIMD_EPSILON)
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{
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normal.normalize();
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}
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else
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{
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normal.setValue(0, 0, 0);
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}
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vtx0.normal[0] = normal[0];
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vtx0.normal[1] = normal[1];
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vtx0.normal[2] = normal[2];
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vtx1.normal[0] = normal[0];
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vtx1.normal[1] = normal[1];
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vtx1.normal[2] = normal[2];
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vtx2.normal[0] = normal[0];
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vtx2.normal[1] = normal[1];
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vtx2.normal[2] = normal[2];
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}
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else
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{
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vtx0.normal[0] = attribute.normals[3 * n0Index+ 0];
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vtx0.normal[1] = attribute.normals[3 * n0Index+ 1];
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vtx0.normal[2] = attribute.normals[3 * n0Index+ 2];
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vtx1.normal[0] = attribute.normals[3 * n1Index+ 0];
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vtx1.normal[1] = attribute.normals[3 * n1Index+ 1];
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vtx1.normal[2] = attribute.normals[3 * n1Index+ 2];
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vtx2.normal[0] = attribute.normals[3 * n2Index+ 0];
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vtx2.normal[1] = attribute.normals[3 * n2Index+ 1];
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vtx2.normal[2] = attribute.normals[3 * n2Index+ 2];
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}
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vertices->push_back(vtx0);
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vertices->push_back(vtx1);
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vertices->push_back(vtx2);
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indicesPtr->push_back(vtxBaseIndex);
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indicesPtr->push_back(vtxBaseIndex + 1);
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indicesPtr->push_back(vtxBaseIndex + 2);
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}
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}
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}
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GLInstanceGraphicsShape* gfxShape = new GLInstanceGraphicsShape;
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gfxShape->m_vertices = vertices;
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gfxShape->m_numvertices = vertices->size();
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gfxShape->m_indices = indicesPtr;
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gfxShape->m_numIndices = indicesPtr->size();
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for (int i = 0; i < 4; i++)
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gfxShape->m_scaling[i] = 1; //bake the scaling into the vertices
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return gfxShape;
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}
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}
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