goat3dgfx: 3eb6c8f89fe1 src/assload.cc

goat3dgfx

view src/assload.cc @ 34:3eb6c8f89fe1

merge

author	John Tsiombikas <nuclear@member.fsf.org>
date	Sun, 02 Mar 2014 17:41:10 +0200
parents	1873dfd13f2d
children

line source

1 #include <stdio.h>

2 #include "assload.h"

3 #include "logger.h"

4 #include "datapath.h"

6 #ifdef USE_ASSIMP

8 #include <vector>

9 #include <map>

10 #include "assimp/cimport.h"

11 #include "assimp/scene.h"

12 #include "assimp/postprocess.h"

13 #include "texman.h"

14 #include "material.h"

15 #include "scene.h"

17 using namespace std;

18 using namespace goatgfx;

20 static bool load_material(Material *mat, const aiMaterial *aimat);

21 static Object *load_node(const aiScene *aiscn, const aiNode *ainode);

22 static Mesh *load_mesh(const aiScene *aiscn, const aiMesh *aimesh);

23 static Curve *load_curve(const aiScene *aiscn, const aiMesh *aimesh);

24 static bool load_bones(Mesh *mesh, const aiMesh *aimesh);

26 static Vector3 assimp_vector(const aiVector3D &v);

27 static Quaternion assimp_quat(const aiQuaternion &q);

28 static Matrix4x4 assimp_matrix(const aiMatrix4x4 &aim);

29 static long assimp_time(const aiAnimation *anim, double aitime);

30 static void print_hierarchy(const aiNode *node);

32 static map<string, Object*> obj_by_name;

33 static map<aiMesh*, Mesh*> mesh_by_aimesh;

35 bool load_ass(Scene *scn, const char *fname)

36 {

37 static bool init_done;

39 if(!init_done) {

40 static aiLogStream log_stream = aiGetPredefinedLogStream(aiDefaultLogStream_STDOUT, 0);

41 aiAttachLogStream(&log_stream);

42 //aiEnableVerboseLogging(1);

43 init_done = true;

44 }

46 unsigned int proc_flags = aiProcess_JoinIdenticalVertices |

47 aiProcess_CalcTangentSpace |

48 aiProcess_Triangulate |

49 aiProcess_SortByPType |

50 aiProcess_FlipUVs;

52 const aiScene *aiscn = aiImportFile(datafile_path(fname).c_str(), proc_flags);

53 if(!aiscn) {

54 error_log("failed to load file: %s\n", fname);

55 return false;

56 }

58 info_log("NODE HIERARCHY:\n");

59 print_hierarchy(aiscn->mRootNode);

60 info_log("-------------------\n");

62 Vector3 root_pos, root_scaling(1.0, 1.0, 1.0);

63 Quaternion root_rot;

65 if(aiscn->mRootNode) {

66 Matrix4x4 root_matrix = assimp_matrix(aiscn->mRootNode->mTransformation);

67 root_pos = root_matrix.get_translation();

68 root_rot = root_matrix.get_rotation_quat();

69 root_scaling = root_matrix.get_scaling();

70 }

72 // load all meshes

73 for(unsigned int i=0; i<aiscn->mNumMeshes; i++) {

74 aiMesh *aimesh = aiscn->mMeshes[i];

75 Mesh *mesh;

76 Curve *curve;

78 switch(aimesh->mPrimitiveTypes) {

79 case aiPrimitiveType_TRIANGLE:

80 if((mesh = load_mesh(aiscn, aimesh))) {

81 mesh_by_aimesh[aimesh] = mesh;

82 scn->meshes.push_back(mesh);

83 }

84 break;

86 case aiPrimitiveType_LINE:

87 if((curve = load_curve(aiscn, aimesh))) {

88 scn->curves.push_back(curve);

89 }

90 break;

92 default:

93 error_log("unsupported primitive type: %u\n", aimesh->mPrimitiveTypes);

94 break;

95 }

96 }

98 // load all the nodes recursively

99 for(unsigned int i=0; i<aiscn->mRootNode->mNumChildren; i++) {

100 Object *obj = load_node(aiscn, aiscn->mRootNode->mChildren[i]);

101 if(obj) {

102 Object *dummy = new Object;

103 dummy->set_name((string("dummyroot_") + string(obj->get_name())).c_str());

104 dummy->set_position(root_pos);

105 dummy->set_rotation(root_rot);

106 dummy->set_scaling(root_scaling);

107 dummy->add_child(obj);

108

109 obj = dummy;

110 scn->objects.push_back(obj);

111 }

112 }

113

114 // load and attach the bones to the meshes

115 for(unsigned int i=0; i<aiscn->mNumMeshes; i++) {

116 aiMesh *aimesh = aiscn->mMeshes[i];

117

118 Mesh *mesh = mesh_by_aimesh[aimesh];

119 load_bones(mesh, aimesh);

120 }

121

122 obj_by_name.clear();

123 mesh_by_aimesh.clear();

124

125 aiReleaseImport(aiscn);

126 return true;

127 }

128

129 static bool load_material(Material *mat, const aiMaterial *aimat)

130 {

131 aiColor4D aicol;

132 float shin, shin_str;

133

134 if(aiGetMaterialColor(aimat, AI_MATKEY_COLOR_DIFFUSE, &aicol) == 0) {

135 mat->diffuse = Vector3(aicol[0], aicol[1], aicol[2]);

136 }

137 if(aiGetMaterialColor(aimat, AI_MATKEY_COLOR_SPECULAR, &aicol) == 0) {

138 mat->specular = Vector3(aicol[0], aicol[1], aicol[2]);

139 }

140

141 unsigned int count = 1;

142 if(aiGetMaterialFloatArray(aimat, AI_MATKEY_SHININESS_STRENGTH, &shin_str, &count) != 0) {

143 shin_str = 1.0;

144 }

145 if(aiGetMaterialFloatArray(aimat, AI_MATKEY_SHININESS, &shin, &count) == 0) {

146 // XXX can't remember how I came up with this...

147 mat->shininess = shin * shin_str * 0.0001 * 128.0;

148 }

149

150 // load textures

151 struct { int type; aiTextureType aitype; } textypes[] = {

152 {TEX_DIFFUSE, aiTextureType_DIFFUSE},

153 {TEX_NORMAL, aiTextureType_NORMALS},

154 {TEX_SPECULAR, aiTextureType_SPECULAR}

155 };

156

157 for(int i=0; i<sizeof textypes / sizeof *textypes; i++) {

158 aiString aipath;

159

160 if(aiGetMaterialTexture(aimat, textypes[i].aitype, 0, &aipath) == 0) {

161 char *tmp, *fname = aipath.data;

162

163 if((tmp = strrchr(fname, '/'))) {

164 fname = tmp + 1;

165 }

166 if((tmp = strrchr(fname, '\\'))) {

167 fname = tmp + 1;

168 }

169

170 if(*fname) {

171 mat->tex[textypes[i].type] = texset.get(fname);

172 }

173 }

174 }

175

176 return true;

177 }

178

179 static Object *load_node(const aiScene *aiscn, const aiNode *ainode)

180 {

181 Object *obj = new Object;

182 obj->set_name(ainode->mName.data);

183

184 if(ainode->mNumMeshes) {

185 if(ainode->mNumMeshes > 1) {

186 info_log("%s warning: node %s has more than one meshes (%u)\n", __FUNCTION__,

187 ainode->mName.data, ainode->mNumMeshes);

188 }

189

190 aiMesh *aimesh = aiscn->mMeshes[ainode->mMeshes[0]];

191 obj->set_mesh(mesh_by_aimesh[aimesh]);

192

193 // also grab the material of this mesh

194 load_material(&obj->material, aiscn->mMaterials[aimesh->mMaterialIndex]);

195 }

196

197 // if there are animations, grab the first and try to use it

198 if(aiscn->mNumAnimations) {

199 aiAnimation *aianim = aiscn->mAnimations[0];

200 aiNodeAnim *ainodeanim = 0;

201 for(unsigned int i=0; i<aianim->mNumChannels; i++) {

202 if(strcmp(aianim->mChannels[i]->mNodeName.data, ainode->mName.data) == 0) {

203 ainodeanim = aianim->mChannels[i];

204 break;

205 }

206 }

207

208 if(ainodeanim) {

209 // load all position (translation) keyframes

210 for(unsigned int i=0; i<ainodeanim->mNumPositionKeys; i++) {

211 Vector3 pos = assimp_vector(ainodeanim->mPositionKeys[i].mValue);

212 long msec = assimp_time(aianim, ainodeanim->mPositionKeys[i].mTime);

213 obj->set_position(pos, msec);

214 }

215

216 // load all rotation keyframes

217 for(unsigned int i=0; i<ainodeanim->mNumRotationKeys; i++) {

218 Quaternion rot = assimp_quat(ainodeanim->mRotationKeys[i].mValue);

219 if(rot.length_sq() < SMALL_NUMBER) {

220 continue;

221 }

222 rot.normalize();

223 long msec = assimp_time(aianim, ainodeanim->mRotationKeys[i].mTime);

224 obj->set_rotation(rot, msec);

225 }

226

227 // load all scaling keyframes

228 for(unsigned int i=0; i<ainodeanim->mNumScalingKeys; i++) {

229 Vector3 scale = assimp_vector(ainodeanim->mScalingKeys[i].mValue);

230 long msec = assimp_time(aianim, ainodeanim->mScalingKeys[i].mTime);

231 obj->set_scaling(scale, msec);

232 }

233

234 obj->set_extrapolator(EXTRAP_REPEAT); // loop animation

235 } else {

236 Matrix4x4 local_matrix = assimp_matrix(ainode->mTransformation);

237 obj->set_local_matrix(local_matrix);

238 }

239 }

240

241 /* recurse to all children */

242 for(unsigned int i=0; i<ainode->mNumChildren; i++) {

243 Object *child = load_node(aiscn, ainode->mChildren[i]);

244 if(child) {

245 obj->add_child(child);

246 }

247 }

248

249 obj_by_name[obj->get_name()] = obj;

250 return obj;

251 }

252

253 static Mesh *load_mesh(const aiScene *aiscn, const aiMesh *aimesh)

254 {

255 Mesh *mesh = new Mesh;

256

257 int num_verts = aimesh->mNumVertices;

258 int num_faces = aimesh->mNumFaces;

259

260 mesh->set_attrib_data(MESH_ATTR_VERTEX, 3, num_verts, (float*)aimesh->mVertices);

261

262 if(aimesh->mNormals) {

263 mesh->set_attrib_data(MESH_ATTR_NORMAL, 3, num_verts, (float*)aimesh->mNormals);

264 }

265 if(aimesh->mTangents) {

266 mesh->set_attrib_data(MESH_ATTR_TANGENT, 3, num_verts, (float*)aimesh->mTangents);

267 }

268 if(aimesh->mTextureCoords[0]) {

269 mesh->set_attrib_data(MESH_ATTR_TEXCOORD, 3, num_verts, (float*)aimesh->mTextureCoords[0]);

270 }

271

272 if(aimesh->mBones) {

273 float *weights = mesh->set_attrib_data(MESH_ATTR_BONEWEIGHTS, 4, num_verts, 0);

274 float *boneidx = mesh->set_attrib_data(MESH_ATTR_BONEIDX, 4, num_verts, 0);

275

276 memset(weights, 0, num_verts * 4 * sizeof *weights);

277 memset(boneidx, 0, num_verts * 4 * sizeof *boneidx);

278

279 int *vertex_bone_count = new int[num_verts];

280 memset(vertex_bone_count, 0, num_verts * sizeof *vertex_bone_count);

281

282 for(unsigned int i=0; i<aimesh->mNumBones; i++) {

283 aiBone *aibone = aimesh->mBones[i];

284

285 // for every vertex affected by this bone:

286 for(unsigned int j=0; j<aibone->mNumWeights; j++) {

287 aiVertexWeight *aiweight = aibone->mWeights + j;

288 int vidx = aiweight->mVertexId;

289 int vert_boneidx = vertex_bone_count[vidx];

290 if(vert_boneidx >= 4) {

291 error_log("WARNING vertex with more than 4 bones found\n");

292 continue;

293 }

294

295 weights[vidx * 4 + vert_boneidx] = aiweight->mWeight;

296 boneidx[vidx * 4 + vert_boneidx] = (float)i;

297 vertex_bone_count[vidx]++;

298 }

299 }

300

301 delete [] vertex_bone_count;

302

303 // normalize weights

304 for(int i=0; i<num_verts; i++) {

305

306 float wsum = 0.0f;

307

308 for(int j=0; j<4; j++) {

309 wsum += weights[i * 4 + j];

310 }

311

312 if(1.0 - wsum > 1e-4) {

313 error_log("WARNING vertex with weights < 1 (%f), normalizing...\n", wsum);

314

315 if(wsum < 1e-6) {

316 // this is clearly broken, let's use the first bone in full

317 weights[i * 4] = 1.0;

318 } else {

319 weights[i * 4] /= wsum;

320 weights[i * 4 + 1] /= wsum;

321 weights[i * 4 + 2] /= wsum;

322 weights[i * 4 + 3] /= wsum;

323 }

324 }

325 }

326 }

327

328 unsigned int *iptr = mesh->set_index_data(num_faces * 3);

329 for(int i=0; i<num_faces; i++) {

330 for(int j=0; j<3; j++) {

331 *iptr++ = aimesh->mFaces[i].mIndices[j];

332 }

333 }

334

335 return mesh;

336 }

337

338 static Curve *load_curve(const aiScene *aiscn, const aiMesh *aimesh)

339 {

340 Curve *curve = new Curve;

341

342 for(unsigned int i=0; i<aimesh->mNumVertices; i++) {

343 Vector3 pt = assimp_vector(aimesh->mVertices[i]);

344 curve->add_point(pt);

345 }

346 info_log("loaded curve with %d points\n", aimesh->mNumVertices);

347

348 return curve;

349 }

350

351 static bool load_bones(Mesh *mesh, const aiMesh *aimesh)

352 {

353 if(!aimesh->mNumBones) {

354 return false;

355 }

356

357 for(unsigned int i=0; i<aimesh->mNumBones; i++) {

358 aiBone *aibone = aimesh->mBones[i];

359 Object *obj = obj_by_name[aibone->mName.data];

360 if(!obj) {

361 error_log("bone %s not found\n", aibone->mName.data);

362 continue;

363 }

364

365 obj->set_bone_matrix(assimp_matrix(aibone->mOffsetMatrix));

366 mesh->add_bone(obj);

367

368 info_log("adding bone: %s\n", obj->get_name());

369 }

370

371 return true;

372 }

373

374 static Vector3 assimp_vector(const aiVector3D &v)

375 {

376 return Vector3(v[0], v[1], v[2]);

377 }

378

379 static Quaternion assimp_quat(const aiQuaternion &q)

380 {

381 return Quaternion(q.w, Vector3(q.x, q.y, q.z));

382 }

383

384 static Matrix4x4 assimp_matrix(const aiMatrix4x4 &aim)

385 {

386 Matrix4x4 m;

387 memcpy(m[0], &aim, 16 * sizeof(float));

388 return m;

389 }

390

391 /* convert an assimp keyframe time (ticks) into milliseconds */

392 static long assimp_time(const aiAnimation *anim, double aitime)

393 {

394 double sec;

395 if(anim->mTicksPerSecond < 1e-6) {

396 // assume time is in frames?

397 sec = aitime / 30.0;

398 } else {

399 sec = aitime / anim->mTicksPerSecond;

400 }

401 return (long)(sec * 1000.0);

402 }

403

404 static void print_hierarchy(const aiNode *node)

405 {

406 static int lvl;

407 static int lvlopen[256];

408

409 for(int i=0; i<lvl; i++) {

410 putchar(' ');

411 if(lvlopen[i]) {

412 putchar(i >= lvl - 1 ? '+' : '|');

413 } else {

414 putchar(i >= lvl - 1 ? '+' : ' ');

415 }

416 }

417 info_log("- \"%s\"\n", node->mName.data);

418

419 lvlopen[lvl] = 1;

420

421 lvl++;

422 for(unsigned int i=0; i<node->mNumChildren; i++) {

423 if(i == node->mNumChildren - 1) {

424 lvlopen[lvl - 1] = 0;

425 }

426 print_hierarchy(node->mChildren[i]);

427 }

428 lvl--;

429 }

430

431 #else // !defined USE_ASSIMP

432

433 using namespace goatgfx;

434

435 bool load_ass(Scene *scn, const char *fname)

436 {

437 error_log("load_ass: assimp support not compiled in\n");

438 return false;

439 }

440

441 #endif