model.cpp

   1 #include "model.hpp"
   2 #include <iostream>
   3 #include <assimp/postprocess.h>
   4 #include <assimp/quaternion.h>
   5 #include <glm/gtc/type_ptr.hpp>
   6
   7 glm::mat4 aiMatrixToMat4(aiMatrix4x4 from) {
   8         glm::mat4 to;
   9         for (int i = 0; i < 4; i++)
  10                 for (int j = 0; j < 4; j++)
  11                         to[i][j] = from[j][i];
  12         return to;
  13 }
  14
  15 Model::Mesh::Mesh(const aiMesh *aiMesh, GLuint progId) {
  16
  17         std::vector<glm::vec3> vertices, normals, tangents, bitangents;
  18         std::vector<glm::vec2> texCoords;
  19
  20         for (int i = 0; i < aiMesh->mNumVertices; i++) {
  21                 if (aiMesh->HasPositions()) {
  22                         aiVector3D v = aiMesh->mVertices[i];
  23                         vertices.push_back(glm::vec3(v.x, v.y, v.z));
  24                 }
  25                 if (aiMesh->HasNormals()) {
  26                         aiVector3D v = aiMesh->mNormals[i];
  27                         normals.push_back(glm::vec3(v.x, v.y, v.z));
  28                 } else {
  29                         std::cerr << "Missing normals" << std::endl;
  30                         exit(1);
  31                 }
  32                 // check for texture coord set 0
  33                 if (aiMesh->HasTextureCoords(0)) {
  34                         const aiVector3D v = aiMesh->mTextureCoords[0][i];
  35                         texCoords.push_back(glm::vec2(v.x, v.y));
  36                 } else {
  37                         texCoords.push_back(glm::vec2(0));
  38                 }
  39                 materialIndex = aiMesh->mMaterialIndex;
  40         }
  41
  42         std::vector<GLuint> indices;
  43
  44         for (int i = 0; i < aiMesh->mNumFaces; i++) {
  45                 const aiFace &face = aiMesh->mFaces[i];
  46                 if(face.mNumIndices == 3) {
  47                         indices.push_back(face.mIndices[0]);
  48                         indices.push_back(face.mIndices[1]);
  49                         indices.push_back(face.mIndices[2]);
  50                 }
  51         }
  52
  53         numIndices = indices.size();
  54
  55         glGenVertexArrays(1, &vao);
  56         glBindVertexArray(vao);
  57
  58         GLuint vbos[6];
  59         glGenBuffers(6, vbos);
  60         GLuint vertexVbo = vbos[0], normalVbo = vbos[1], texCoordVbo = vbos[2], indicesVbo = vbos[3];
  61         GLuint boneVbo = vbos[4];
  62
  63         GLuint posLoc = glGetAttribLocation(progId, "pos");
  64         glBindBuffer(GL_ARRAY_BUFFER, vertexVbo);
  65         glBufferData(GL_ARRAY_BUFFER, vertices.size() * sizeof(glm::vec3), &vertices[0], GL_STATIC_DRAW);
  66         glEnableVertexAttribArray(posLoc);
  67         glVertexAttribPointer(posLoc, 3, GL_FLOAT, GL_FALSE, 0, 0);
  68
  69         GLuint normalLoc = glGetAttribLocation(progId, "unscaledNormal");
  70         glBindBuffer(GL_ARRAY_BUFFER, normalVbo);
  71         glBufferData(GL_ARRAY_BUFFER, normals.size() * sizeof(glm::vec3), &normals[0], GL_STATIC_DRAW);
  72         glEnableVertexAttribArray(normalLoc);
  73         glVertexAttribPointer(normalLoc, 3, GL_FLOAT, GL_FALSE, 0, 0);
  74
  75         GLuint texCoordLoc = glGetAttribLocation(progId, "vTexCoord");
  76         glBindBuffer(GL_ARRAY_BUFFER, texCoordVbo);
  77         glBufferData(GL_ARRAY_BUFFER, texCoords.size() * sizeof(glm::vec2), &texCoords[0], GL_STATIC_DRAW);
  78         glEnableVertexAttribArray(texCoordLoc);
  79         glVertexAttribPointer(texCoordLoc, 2, GL_FLOAT, GL_FALSE, 0, 0);
  80
  81         glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, indicesVbo);
  82         glBufferData(GL_ELEMENT_ARRAY_BUFFER, indices.size() * sizeof(GLuint), &indices[0], GL_STATIC_DRAW);
  83
  84         // bones
  85         std::vector<VertBones> vertBones(aiMesh->mNumVertices);
  86
  87         std::map<unsigned int, std::vector<std::pair<unsigned int, float>>> boneWeightMap;
  88
  89         for (unsigned int i = 0; i < aiMesh->mNumBones; i++) {
  90                 aiBone *aiBone = aiMesh->mBones[i];
  91
  92                 boneMap[std::string(aiBone->mName.C_Str())] = std::pair(i + 1, aiMatrixToMat4(aiBone->mOffsetMatrix));
  93
  94                 for (int j = 0; j < aiBone->mNumWeights; j++) {
  95                         aiVertexWeight vw = aiBone->mWeights[j];
  96
  97                         if (!boneWeightMap.count(vw.mVertexId)) boneWeightMap[vw.mVertexId] = std::vector<std::pair<unsigned int, float>>();
  98                         boneWeightMap[vw.mVertexId].push_back(std::pair(i + 1, vw.mWeight));
  99                 }
 100         }
 101
 102         for (auto pair: boneWeightMap) {
 103                 unsigned int vertexId = pair.first;
 104                 for (int i = 0; i < pair.second.size() && i < 4; i++) {
 105                         unsigned int boneId = pair.second[i].first;
 106                         float weight = pair.second[i].second;
 107                         vertBones[vertexId].ids[i] = boneId;
 108                         vertBones[vertexId].weights[i] = weight;
 109                 }
 110         }
 111
 112         glBindBuffer(GL_ARRAY_BUFFER, boneVbo);
 113         glBufferData(GL_ARRAY_BUFFER, sizeof(VertBones) * vertBones.size(), &vertBones[0], GL_STATIC_DRAW);
 114
 115         GLuint boneIdLoc = glGetAttribLocation(progId, "boneIds");
 116         glEnableVertexAttribArray(boneIdLoc);
 117         glVertexAttribIPointer(boneIdLoc, 4, GL_INT, sizeof(VertBones), 0);
 118
 119         GLuint boneWeightLoc = glGetAttribLocation(progId, "boneWeights");
 120         glEnableVertexAttribArray(boneWeightLoc);
 121         glVertexAttribPointer(boneWeightLoc, 4, GL_FLOAT, GL_FALSE, sizeof(VertBones), (const GLvoid *)sizeof(VertBones::ids));
 122 }
 123
 124 Model::Node::Node(const aiNode &node, GLuint progId, AnimMap *am): ai(node), progId(progId), animMap(am) {
 125         for (int i = 0; i < node.mNumMeshes; i++) {
 126                 meshIndices.push_back(node.mMeshes[i]);
 127         }
 128         for (int i = 0; i < node.mNumChildren; i++) {
 129                 const aiNode *child = node.mChildren[i];
 130                 children.push_back(new Node(*child, progId, am));
 131         }
 132 }
 133
 134 glm::mat4 lerpPosition(const aiNodeAnim *anim, const float tick) {
 135         if (anim->mNumPositionKeys == 0) return glm::mat4(1.f);
 136
 137         int yIndex = -1;
 138         for (int i = 0; i < anim->mNumPositionKeys; i++) {
 139                 aiVectorKey vk = anim->mPositionKeys[i];
 140                 if (vk.mTime > tick) {
 141                         yIndex = i;
 142                         break;
 143                 }
 144         }
 145         aiVector3D lerpPos;
 146         if (yIndex == 0) {
 147                 lerpPos = anim->mPositionKeys[0].mValue;
 148         } else if (yIndex == -1) {
 149                 lerpPos = anim->mPositionKeys[anim->mNumPositionKeys - 1].mValue;
 150         } else {
 151                 auto X = anim->mPositionKeys[yIndex - 1];
 152                 auto Y = anim->mPositionKeys[yIndex];
 153
 154                 lerpPos = (X.mValue * (float)(Y.mTime - tick) + Y.mValue * (float)(tick - X.mTime)) / (float)(Y.mTime - X.mTime);
 155         }
 156         aiMatrix4x4 result;
 157         aiMatrix4x4::Translation(lerpPos, result);
 158         return aiMatrixToMat4(result);
 159 }
 160
 161 glm::mat4 lerpRotation(const aiNodeAnim *anim, const float tick) {
 162         int yIndex = -1;
 163         for (int i = 0; i < anim->mNumRotationKeys; i++) {
 164                 aiQuatKey vk = anim->mRotationKeys[i];
 165                 if (vk.mTime > tick) {
 166                         yIndex = i;
 167                         break;
 168                 }
 169         }
 170
 171         aiQuaternion result;
 172         if (yIndex < 1) {
 173                 result = anim->mRotationKeys[0].mValue;
 174         } else if (yIndex == -1) {
 175                 result = anim->mRotationKeys[anim->mNumRotationKeys - 1].mValue;
 176         } else {
 177
 178                 auto X = anim->mRotationKeys[yIndex - 1];
 179                 auto Y = anim->mRotationKeys[yIndex];
 180
 181                 float mix = (tick - X.mTime) / (Y.mTime - X.mTime);
 182
 183                 aiQuaternion::Interpolate(result, X.mValue, Y.mValue, mix);
 184
 185         }
 186         return aiMatrixToMat4(aiMatrix4x4(result.GetMatrix()));
 187 }
 188
 189 glm::mat4 lerpScaling(const aiNodeAnim *anim, const float tick) {
 190         int yIndex = -1;
 191         for (int i = 0; i < anim->mNumScalingKeys; i++) {
 192                 aiVectorKey vk = anim->mScalingKeys[i];
 193                 if (vk.mTime > tick) {
 194                         yIndex = i;
 195                         break;
 196                 }
 197         }
 198
 199         aiVector3D lerpPos;
 200         if (yIndex < 1) {
 201                 lerpPos = anim->mScalingKeys[0].mValue;
 202         } else {
 203                 auto X = anim->mScalingKeys[yIndex - 1];
 204                 auto Y = anim->mScalingKeys[yIndex];
 205
 206                 lerpPos = (X.mValue * (float)(Y.mTime - tick) + Y.mValue * (float)(tick - X.mTime)) / (float)(Y.mTime - X.mTime);
 207         }
 208         aiMatrix4x4 result;
 209         aiMatrix4x4::Scaling(lerpPos, result);
 210         return aiMatrixToMat4(result);
 211 }
 212
 213 void Model::Node::draw( const std::vector<Mesh> &meshes,
 214                                                 const std::vector<Material> &materials,
 215                                                 const Skybox skybox,
 216                                                 const float tick,
 217                                                 glm::mat4 parentTrans = glm::mat4(1),
 218                                                 BoneTransforms boneTransforms = BoneTransforms()) const {
 219
 220         GLuint modelLoc = glGetUniformLocation(progId, "model");
 221
 222         glm::mat4 animTrans(1.f);
 223         if (animMap->count(std::string(ai.mName.C_Str()))) {
 224                 for (const Animation anim: animMap->at(std::string(ai.mName.C_Str()))) {
 225                         float t = fmod(tick, anim.duration);
 226                         for (const aiNodeAnim *nodeAnim: anim.nodeAnims) {
 227                                 animTrans *= lerpPosition(nodeAnim, t);
 228                                 animTrans *= lerpRotation(nodeAnim, t);
 229                                 animTrans *= lerpScaling(nodeAnim, t);
 230                         }
 231                 }
 232         }
 233
 234
 235         glm::mat4 m = parentTrans * animTrans * aiMatrixToMat4(ai.mTransformation) * model;
 236
 237         for (auto child: children) {
 238                 boneTransforms[std::string(ai.mName.C_Str())] = m;
 239         }
 240
 241         for (unsigned int i: meshIndices) {
 242                 const Mesh &mesh = meshes[i];
 243                 glBindVertexArray(mesh.vao);
 244
 245                 // bones
 246                 std::vector<glm::mat4> idBones(17, glm::mat4(1.f));
 247                 glUniformMatrix4fv(glGetUniformLocation(progId, "bones"), 17, GL_FALSE, glm::value_ptr(idBones[0]));
 248
 249                 for (std::pair<std::string, std::pair<unsigned int, glm::mat4>> pair: mesh.boneMap) {
 250
 251                         std::string nodeName = pair.first;
 252                         unsigned int boneId = pair.second.first;
 253                         glm::mat4 boneOffset = pair.second.second;
 254
 255                         glm::mat4 boneTrans(1.f);
 256                         if (boneTransforms.count(nodeName)) {
 257                                 std::cerr << "got bone transform from map" << std::endl;
 258                                 boneTrans = boneTransforms[nodeName];
 259                         }
 260                         for (const Animation anim: animMap->at(nodeName)) {
 261                                 float t = fmod(tick, anim.duration);
 262                                 for (const aiNodeAnim *nodeAnim: anim.nodeAnims) {
 263                                         boneTrans = boneTrans * lerpPosition(nodeAnim, t);
 264                                         boneTrans = boneTrans * lerpRotation(nodeAnim, t);
 265                                         boneTrans = boneTrans * lerpScaling(nodeAnim, t);
 266                                 }
 267                         }
 268
 269                         boneTrans = boneTrans * glm::inverse(boneOffset);
 270
 271
 272                         std::string boneLocStr = "bones[" + std::to_string(boneId) + "]";
 273                         GLuint boneLoc = glGetUniformLocation(progId, boneLocStr.c_str());
 274                         glUniformMatrix4fv(boneLoc, 1, GL_FALSE, glm::value_ptr(boneTrans));
 275                 }
 276
 277                 Material material = materials[mesh.materialIndex];
 278                 material.bind();
 279
 280                 glUniform1i(glGetUniformLocation(progId, "irradianceMap"), 4);
 281                 glActiveTexture(GL_TEXTURE4);
 282                 glBindTexture(GL_TEXTURE_CUBE_MAP, skybox.getIrradianceMap());
 283
 284                 glUniform1i(glGetUniformLocation(progId, "prefilterMap"), 5);
 285                 glActiveTexture(GL_TEXTURE5);
 286                 glBindTexture(GL_TEXTURE_CUBE_MAP, skybox.getPrefilterMap());
 287
 288                 glUniform1i(glGetUniformLocation(progId, "brdfMap"), 6);
 289                 glActiveTexture(GL_TEXTURE6);
 290                 glBindTexture(GL_TEXTURE_2D, skybox.getBRDFMap());
 291
 292                 glUniformMatrix4fv(modelLoc, 1, GL_FALSE, glm::value_ptr(m));
 293
 294                 glDrawElements(GL_TRIANGLES, mesh.numIndices, GL_UNSIGNED_INT, 0);
 295         }
 296         for (Node *child: children) child->draw(meshes, materials, skybox, tick, m, boneTransforms);
 297 }
 298
 299 Model::Model(const std::string &path, Program p): program(p) {
 300         glUseProgram(p.progId);
 301
 302         const aiScene *scene = importer.ReadFile(path,
 303                         aiProcess_Triangulate | aiProcess_CalcTangentSpace | aiProcess_GenNormals | aiProcess_FlipUVs);
 304         if (!scene) {
 305                 std::cerr << importer.GetErrorString() << std::endl;
 306                 exit(1);
 307         }
 308
 309         for (int i = 0; i < scene->mNumMeshes; i++) {
 310                 const aiMesh *mesh = scene->mMeshes[i];
 311                 meshes.push_back(Mesh(mesh, p.progId));
 312         }
 313
 314         // TODO: handle default material inserted at the end by assimp
 315         for (unsigned int i = 0; i < scene->mNumMaterials - 1; i++) {
 316                 const aiMaterial &material = *scene->mMaterials[i];
 317                 materials.push_back(Material(material, *scene, p.progId));
 318         }
 319
 320         AnimMap *animMap = new AnimMap();
 321         for (int i = 0; i < scene->mNumAnimations; i++) {
 322                 const aiAnimation *aiAnim = scene->mAnimations[i];
 323
 324                 std::map<std::string, std::vector<const aiNodeAnim*>> nodeAnims;
 325
 326                 for (int j = 0; j < aiAnim->mNumChannels; j++) {
 327                         const aiNodeAnim *nodeAnim = aiAnim->mChannels[j];
 328                         std::string nodeName = std::string(nodeAnim->mNodeName.C_Str());
 329
 330                         if (!nodeAnims.count(nodeName)) nodeAnims[nodeName] = std::vector<const aiNodeAnim*>();
 331
 332                         nodeAnims[nodeName].push_back(nodeAnim);
 333                 }
 334
 335                 for (std::pair<std::string, std::vector<const aiNodeAnim*>> pair: nodeAnims) {
 336                         std::string nodeName = pair.first;
 337
 338                         if (!animMap->count(nodeName)) (*animMap)[nodeName] = std::vector<const Animation>();
 339                         (*animMap)[nodeName].push_back({ aiAnim->mDuration, pair.second });
 340                 }
 341         }
 342
 343         root = new Node(*(scene->mRootNode), p.progId, animMap);
 344 }
 345
 346 /* void Model::calcBoneTransforms(aiNode &node, glm::mat4 parentTrans = glm::mat4(1), BoneTransforms boneTrans = BoneTransforms()) { */
 347 /*      glm::mat4 animTrans(1.f); */
 348 /*      if (animMap->count(std::string(ai.mName.C_Str()))) { */
 349 /*              for (const Animation anim: animMap->at(std::string(ai.mName.C_Str()))) { */
 350 /*                      float t = fmod(tick, anim.duration); */
 351 /*                      for (const aiNodeAnim *nodeAnim: anim.nodeAnims) { */
 352 /*                              animTrans *= lerpPosition(nodeAnim, t); */
 353 /*                              animTrans *= lerpRotation(nodeAnim, t); */
 354 /*                              animTrans *= lerpScaling(nodeAnim, t); */
 355 /*                      } */
 356 /*              } */
 357 /*      } */
 358
 359
 360 /*      glm::mat4 m = parentTrans * animTrans * aiMatrixToMat4(ai.mTransformation) * model; */
 361 /* } */
 362
 363 void Model::draw(Skybox skybox, const float tick) const {
 364         glUseProgram(program.progId);
 365
 366
 367
 368         root->draw(meshes, materials, skybox, tick);
 369 }
 370
 371 Model::Node* Model::find(const std::string &name) {
 372         return find(aiString(name));
 373 }
 374
 375 Model::Node* Model::find(const aiString name) {
 376         const aiNode *node = root->ai.FindNode(name);
 377         Model::Node* res = root->findNode(*node);
 378         return res;
 379 }
 380
 381 Model::Node* Model::Node::findNode(const aiNode &aiNode) {
 382         if (&ai == &aiNode) return this;
 383         for (Model::Node *child: children) {
 384                 Model::Node *res = child->findNode(aiNode);
 385                 if (res) return res;
 386         }
 387         return nullptr;
 388 }