model.cpp

   1 #include "model.hpp"
   2 #include <iostream>
   3 #include <assimp/quaternion.h>
   4 #include <glm/gtc/type_ptr.hpp>
   5
   6
   7 Model::Mesh::Mesh(const aiMesh *aiMesh, GLuint progId) {
   8
   9         std::vector<glm::vec3> vertices, normals, tangents, bitangents;
  10         std::vector<glm::vec2> texCoords;
  11
  12         for (int i = 0; i < aiMesh->mNumVertices; i++) {
  13                 if (aiMesh->HasPositions()) {
  14                         aiVector3D v = aiMesh->mVertices[i];
  15                         vertices.push_back(glm::vec3(v.x, v.y, v.z));
  16                 }
  17                 if (aiMesh->HasNormals()) {
  18                         aiVector3D v = aiMesh->mNormals[i];
  19                         normals.push_back(glm::vec3(v.x, v.y, v.z));
  20                 } else {
  21                         std::cerr << "Missing normals" << std::endl;
  22                         exit(1);
  23                 }
  24                 // check for texture coord set 0
  25                 if (aiMesh->HasTextureCoords(0)) {
  26                         const aiVector3D v = aiMesh->mTextureCoords[0][i];
  27                         texCoords.push_back(glm::vec2(v.x, v.y));
  28                 } else {
  29                         texCoords.push_back(glm::vec2(0));
  30                 }
  31                 materialIndex = aiMesh->mMaterialIndex;
  32         }
  33
  34         std::vector<GLuint> indices;
  35
  36         for (int i = 0; i < aiMesh->mNumFaces; i++) {
  37                 const aiFace &face = aiMesh->mFaces[i];
  38                 if(face.mNumIndices == 3) {
  39                         indices.push_back(face.mIndices[0]);
  40                         indices.push_back(face.mIndices[1]);
  41                         indices.push_back(face.mIndices[2]);
  42                 }
  43         }
  44
  45         numIndices = indices.size();
  46
  47         glGenVertexArrays(1, &vao);
  48         glBindVertexArray(vao);
  49
  50         GLuint vbos[6];
  51         glGenBuffers(6, vbos);
  52         GLuint vertexVbo = vbos[0], normalVbo = vbos[1], texCoordVbo = vbos[2], indicesVbo = vbos[3];
  53         GLuint boneVbo = vbos[4];
  54
  55         GLuint posLoc = glGetAttribLocation(progId, "pos");
  56         glBindBuffer(GL_ARRAY_BUFFER, vertexVbo);
  57         glBufferData(GL_ARRAY_BUFFER, vertices.size() * sizeof(glm::vec3), &vertices[0], GL_STATIC_DRAW);
  58         glEnableVertexAttribArray(posLoc);
  59         glVertexAttribPointer(posLoc, 3, GL_FLOAT, GL_FALSE, 0, 0);
  60
  61         GLuint normalLoc = glGetAttribLocation(progId, "unscaledNormal");
  62         glBindBuffer(GL_ARRAY_BUFFER, normalVbo);
  63         glBufferData(GL_ARRAY_BUFFER, normals.size() * sizeof(glm::vec3), &normals[0], GL_STATIC_DRAW);
  64         glEnableVertexAttribArray(normalLoc);
  65         glVertexAttribPointer(normalLoc, 3, GL_FLOAT, GL_FALSE, 0, 0);
  66
  67         GLuint texCoordLoc = glGetAttribLocation(progId, "vTexCoord");
  68         glBindBuffer(GL_ARRAY_BUFFER, texCoordVbo);
  69         glBufferData(GL_ARRAY_BUFFER, texCoords.size() * sizeof(glm::vec2), &texCoords[0], GL_STATIC_DRAW);
  70         glEnableVertexAttribArray(texCoordLoc);
  71         glVertexAttribPointer(texCoordLoc, 2, GL_FLOAT, GL_FALSE, 0, 0);
  72
  73         glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, indicesVbo);
  74         glBufferData(GL_ELEMENT_ARRAY_BUFFER, indices.size() * sizeof(GLuint), &indices[0], GL_STATIC_DRAW);
  75
  76         // bones
  77         std::vector<VertBones> vertBones(aiMesh->mNumVertices);
  78
  79         std::map<unsigned int, std::vector<std::pair<unsigned int, float>>> boneWeightMap;
  80
  81         for (unsigned int i = 0; i < aiMesh->mNumBones; i++) {
  82                 aiBone *aiBone = aiMesh->mBones[i];
  83
  84                 boneMap[std::string(aiBone->mName.C_Str())] = std::pair(i + 1, aiMatrixToMat4(aiBone->mOffsetMatrix));
  85
  86                 for (int j = 0; j < aiBone->mNumWeights; j++) {
  87                         aiVertexWeight vw = aiBone->mWeights[j];
  88
  89                         if (!boneWeightMap.count(vw.mVertexId)) boneWeightMap[vw.mVertexId] = std::vector<std::pair<unsigned int, float>>();
  90                         boneWeightMap[vw.mVertexId].push_back(std::pair(i + 1, vw.mWeight));
  91                 }
  92         }
  93
  94         for (auto pair: boneWeightMap) {
  95                 unsigned int vertexId = pair.first;
  96                 for (int i = 0; i < pair.second.size() && i < 4; i++) {
  97                         unsigned int boneId = pair.second[i].first;
  98                         float weight = pair.second[i].second;
  99                         vertBones[vertexId].ids[i] = boneId;
 100                         vertBones[vertexId].weights[i] = weight;
 101                 }
 102         }
 103
 104         glBindBuffer(GL_ARRAY_BUFFER, boneVbo);
 105         glBufferData(GL_ARRAY_BUFFER, sizeof(VertBones) * vertBones.size(), &vertBones[0], GL_STATIC_DRAW);
 106
 107         GLuint boneIdLoc = glGetAttribLocation(progId, "boneIds");
 108         glEnableVertexAttribArray(boneIdLoc);
 109         glVertexAttribIPointer(boneIdLoc, 4, GL_INT, sizeof(VertBones), 0);
 110
 111         GLuint boneWeightLoc = glGetAttribLocation(progId, "boneWeights");
 112         glEnableVertexAttribArray(boneWeightLoc);
 113         glVertexAttribPointer(boneWeightLoc, 4, GL_FLOAT, GL_FALSE, sizeof(VertBones), (const GLvoid *)sizeof(VertBones::ids));
 114 }
 115
 116 Model::Node::Node(const aiNode &node, GLuint progId, AnimMap *am): ai(node), progId(progId), animMap(am) {
 117         for (int i = 0; i < node.mNumMeshes; i++) {
 118                 meshIndices.push_back(node.mMeshes[i]);
 119         }
 120         for (int i = 0; i < node.mNumChildren; i++) {
 121                 const aiNode *child = node.mChildren[i];
 122                 children.push_back(new Node(*child, progId, am));
 123         }
 124 }
 125
 126 glm::mat4 lerpPosition(const aiNodeAnim *anim, const float tick) {
 127         if (anim->mNumPositionKeys == 0) return glm::mat4(1.f);
 128
 129         int yIndex = -1;
 130         for (int i = 0; i < anim->mNumPositionKeys; i++) {
 131                 aiVectorKey vk = anim->mPositionKeys[i];
 132                 if (vk.mTime > tick) {
 133                         yIndex = i;
 134                         break;
 135                 }
 136         }
 137         aiVector3D lerpPos;
 138         if (yIndex == 0) {
 139                 lerpPos = anim->mPositionKeys[0].mValue;
 140         } else if (yIndex == -1) {
 141                 lerpPos = anim->mPositionKeys[anim->mNumPositionKeys - 1].mValue;
 142         } else {
 143                 auto X = anim->mPositionKeys[yIndex - 1];
 144                 auto Y = anim->mPositionKeys[yIndex];
 145
 146                 lerpPos = (X.mValue * (float)(Y.mTime - tick) + Y.mValue * (float)(tick - X.mTime)) / (float)(Y.mTime - X.mTime);
 147         }
 148         aiMatrix4x4 result;
 149         aiMatrix4x4::Translation(lerpPos, result);
 150         return aiMatrixToMat4(result);
 151 }
 152
 153 glm::mat4 lerpRotation(const aiNodeAnim *anim, const float tick) {
 154         int yIndex = -1;
 155         for (int i = 0; i < anim->mNumRotationKeys; i++) {
 156                 aiQuatKey vk = anim->mRotationKeys[i];
 157                 if (vk.mTime > tick) {
 158                         yIndex = i;
 159                         break;
 160                 }
 161         }
 162
 163         aiQuaternion result;
 164         if (yIndex < 1) {
 165                 result = anim->mRotationKeys[0].mValue;
 166         } else if (yIndex == -1) {
 167                 result = anim->mRotationKeys[anim->mNumRotationKeys - 1].mValue;
 168         } else {
 169
 170                 auto X = anim->mRotationKeys[yIndex - 1];
 171                 auto Y = anim->mRotationKeys[yIndex];
 172
 173                 float mix = (tick - X.mTime) / (Y.mTime - X.mTime);
 174
 175                 aiQuaternion::Interpolate(result, X.mValue, Y.mValue, mix);
 176
 177         }
 178         return aiMatrixToMat4(aiMatrix4x4(result.GetMatrix()));
 179 }
 180
 181 glm::mat4 lerpScaling(const aiNodeAnim *anim, const float tick) {
 182         int yIndex = -1;
 183         for (int i = 0; i < anim->mNumScalingKeys; i++) {
 184                 aiVectorKey vk = anim->mScalingKeys[i];
 185                 if (vk.mTime > tick) {
 186                         yIndex = i;
 187                         break;
 188                 }
 189         }
 190
 191         aiVector3D lerpPos;
 192         if (yIndex < 1) {
 193                 lerpPos = anim->mScalingKeys[0].mValue;
 194         } else {
 195                 auto X = anim->mScalingKeys[yIndex - 1];
 196                 auto Y = anim->mScalingKeys[yIndex];
 197
 198                 lerpPos = (X.mValue * (float)(Y.mTime - tick) + Y.mValue * (float)(tick - X.mTime)) / (float)(Y.mTime - X.mTime);
 199         }
 200         aiMatrix4x4 result;
 201         aiMatrix4x4::Scaling(lerpPos, result);
 202         return aiMatrixToMat4(result);
 203 }
 204
 205 void Model::Node::draw( const std::vector<Mesh> &meshes,
 206                                                 const std::vector<Material> &materials,
 207                                                 const Skybox skybox,
 208                                                 const float tick,
 209                                                 glm::mat4 parentTrans = glm::mat4(1),
 210                                                 BoneTransforms boneTransforms = BoneTransforms()) const {
 211
 212         GLuint modelLoc = glGetUniformLocation(progId, "model");
 213
 214         glm::mat4 animTrans(1.f);
 215         if (animMap->count(std::string(ai.mName.C_Str()))) {
 216                 for (const Animation anim: animMap->at(std::string(ai.mName.C_Str()))) {
 217                         float t = fmod(tick, anim.duration);
 218                         for (const aiNodeAnim *nodeAnim: anim.nodeAnims) {
 219                                 animTrans *= lerpPosition(nodeAnim, t);
 220                                 animTrans *= lerpRotation(nodeAnim, t);
 221                                 animTrans *= lerpScaling(nodeAnim, t);
 222                         }
 223                 }
 224         }
 225
 226
 227         glm::mat4 m = parentTrans * animTrans * aiMatrixToMat4(ai.mTransformation);
 228
 229         /* for (auto child: children) { */
 230         /*      boneTransforms[std::string(ai.mName.C_Str())] = m; */
 231         /* } */
 232
 233         for (unsigned int i: meshIndices) {
 234                 const Mesh &mesh = meshes[i];
 235                 glBindVertexArray(mesh.vao);
 236
 237                 // bones
 238                 std::vector<glm::mat4> idBones(17, glm::mat4(1.f));
 239                 glUniformMatrix4fv(glGetUniformLocation(progId, "bones"), 17, GL_FALSE, glm::value_ptr(idBones[0]));
 240
 241                 for (std::pair<std::string, std::pair<unsigned int, glm::mat4>> pair: mesh.boneMap) {
 242
 243                         std::string nodeName = pair.first;
 244                         unsigned int boneId = pair.second.first;
 245                         // This is actually an inverse-bind matrix
 246                         // i.e. position of the mesh in bone space
 247                         // so no need to inverse again!
 248                         // https://github.com/assimp/assimp/pull/1803/files
 249                         glm::mat4 boneOffset = pair.second.second;
 250
 251                         glm::mat4 boneTrans(1.f);
 252                         /* if (boneTransforms.count(nodeName)) { */
 253                         /*      std::cerr << "got bone transform from map" << std::endl; */
 254                         /*      boneTrans = boneTransforms[nodeName]; */
 255                         /* } */
 256                         for (const Animation anim: animMap->at(nodeName)) {
 257                                 float t = fmod(tick, anim.duration);
 258                                 for (const aiNodeAnim *nodeAnim: anim.nodeAnims) {
 259                                         boneTrans = boneTrans * lerpPosition(nodeAnim, t);
 260                                         boneTrans = boneTrans * lerpRotation(nodeAnim, t);
 261                                         boneTrans = boneTrans * lerpScaling(nodeAnim, t);
 262                                 }
 263                         }
 264
 265                         boneTrans = boneTrans * boneOffset;
 266
 267
 268                         std::string boneLocStr = "bones[" + std::to_string(boneId) + "]";
 269                         GLuint boneLoc = glGetUniformLocation(progId, boneLocStr.c_str());
 270                         glUniformMatrix4fv(boneLoc, 1, GL_FALSE, glm::value_ptr(boneTrans));
 271                 }
 272
 273                 Material material = materials[mesh.materialIndex];
 274                 material.bind();
 275
 276                 glUniform1i(glGetUniformLocation(progId, "irradianceMap"), 4);
 277                 glActiveTexture(GL_TEXTURE4);
 278                 glBindTexture(GL_TEXTURE_CUBE_MAP, skybox.getIrradianceMap());
 279
 280                 glUniform1i(glGetUniformLocation(progId, "prefilterMap"), 5);
 281                 glActiveTexture(GL_TEXTURE5);
 282                 glBindTexture(GL_TEXTURE_CUBE_MAP, skybox.getPrefilterMap());
 283
 284                 glUniform1i(glGetUniformLocation(progId, "brdfMap"), 6);
 285                 glActiveTexture(GL_TEXTURE6);
 286                 glBindTexture(GL_TEXTURE_2D, skybox.getBRDFMap());
 287
 288                 glUniformMatrix4fv(modelLoc, 1, GL_FALSE, glm::value_ptr(m));
 289
 290                 glDrawElements(GL_TRIANGLES, mesh.numIndices, GL_UNSIGNED_INT, 0);
 291         }
 292         for (Node *child: children) child->draw(meshes, materials, skybox, tick, m, boneTransforms);
 293 }
 294
 295 Model::Model(const aiScene *scene, Program p): program(p) {
 296         glUseProgram(p.progId);
 297
 298         for (int i = 0; i < scene->mNumMeshes; i++) {
 299                 const aiMesh *mesh = scene->mMeshes[i];
 300                 meshes.push_back(Mesh(mesh, p.progId));
 301         }
 302
 303         // TODO: handle default material inserted at the end by assimp
 304         for (unsigned int i = 0; i < scene->mNumMaterials - 1; i++) {
 305                 const aiMaterial &material = *scene->mMaterials[i];
 306                 materials.push_back(Material(material, *scene, p.progId));
 307         }
 308
 309         AnimMap *animMap = new AnimMap();
 310         for (int i = 0; i < scene->mNumAnimations; i++) {
 311                 const aiAnimation *aiAnim = scene->mAnimations[i];
 312
 313                 std::map<std::string, std::vector<const aiNodeAnim*>> nodeAnims;
 314
 315                 for (int j = 0; j < aiAnim->mNumChannels; j++) {
 316                         const aiNodeAnim *nodeAnim = aiAnim->mChannels[j];
 317                         std::string nodeName = std::string(nodeAnim->mNodeName.C_Str());
 318
 319                         if (!nodeAnims.count(nodeName)) nodeAnims[nodeName] = std::vector<const aiNodeAnim*>();
 320
 321                         nodeAnims[nodeName].push_back(nodeAnim);
 322                 }
 323
 324                 for (std::pair<std::string, std::vector<const aiNodeAnim*>> pair: nodeAnims) {
 325                         std::string nodeName = pair.first;
 326
 327                         if (!animMap->count(nodeName)) (*animMap)[nodeName] = std::vector<const Animation>();
 328                         (*animMap)[nodeName].push_back({ aiAnim->mDuration, pair.second });
 329                 }
 330         }
 331
 332         root = new Node(*(scene->mRootNode), p.progId, animMap);
 333 }
 334
 335 /* void Model::calcBoneTransforms(aiNode &node, glm::mat4 parentTrans = glm::mat4(1), BoneTransforms boneTrans = BoneTransforms()) { */
 336 /*      glm::mat4 animTrans(1.f); */
 337 /*      if (animMap->count(std::string(ai.mName.C_Str()))) { */
 338 /*              for (const Animation anim: animMap->at(std::string(ai.mName.C_Str()))) { */
 339 /*                      float t = fmod(tick, anim.duration); */
 340 /*                      for (const aiNodeAnim *nodeAnim: anim.nodeAnims) { */
 341 /*                              animTrans *= lerpPosition(nodeAnim, t); */
 342 /*                              animTrans *= lerpRotation(nodeAnim, t); */
 343 /*                              animTrans *= lerpScaling(nodeAnim, t); */
 344 /*                      } */
 345 /*              } */
 346 /*      } */
 347
 348
 349 /*      glm::mat4 m = parentTrans * animTrans * aiMatrixToMat4(ai.mTransformation) * model; */
 350 /* } */
 351
 352 void Model::draw(Skybox skybox, const float tick) const {
 353         glUseProgram(program.progId);
 354
 355
 356
 357         root->draw(meshes, materials, skybox, tick);
 358 }
 359
 360 Model::Node* Model::find(const std::string &name) {
 361         return find(aiString(name));
 362 }
 363
 364 Model::Node* Model::find(const aiString name) {
 365         const aiNode *node = root->ai.FindNode(name);
 366         Model::Node* res = root->findNode(*node);
 367         return res;
 368 }
 369
 370 Model::Node* Model::Node::findNode(const aiNode &aiNode) {
 371         if (&ai == &aiNode) return this;
 372         for (Model::Node *child: children) {
 373                 Model::Node *res = child->findNode(aiNode);
 374                 if (res) return res;
 375         }
 376         return nullptr;
 377 }