src/client/model.c

   1 #include <dragonstd/tree.h>
   2 #include <getline.h>
   3 #include <stdio.h>
   4 #include <stdlib.h>
   5 #include <pthread.h>
   6 #include "client/camera.h"
   7 #include "client/client_config.h"
   8 #include "client/frustum.h"
   9 #include "client/opengl.h"
  10 #include "client/model.h"
  11
  12 typedef struct {
  13         GLuint texture;
  14         Array vertices;
  15 } ModelBatchTexture;
  16
  17 static List scene;
  18 static List scene_new;
  19 static pthread_mutex_t lock_scene_new;
  20 static GLint units;
  21
  22 static int cmp_batch_texture(const ModelBatchTexture *ta, const ModelBatchTexture *tb)
  23 {
  24         return
  25                 ta->vertices.siz > tb->vertices.siz ? -1 :
  26                 ta->vertices.siz < tb->vertices.siz ? +1 :
  27                 0;
  28 }
  29
  30 static int cmp_node(const ModelNode *node, const char *str)
  31 {
  32         if (str == node->name)
  33                 return 0;
  34
  35         if (!node->name)
  36                 return -1;
  37
  38         if (!str)
  39                 return +1;
  40
  41         return strcmp(node->name, str);
  42 }
  43
  44 static void transform_node(ModelNode *node)
  45 {
  46         if (node->parent)
  47                 mat4x4_mul(node->abs, node->parent->abs, node->rel);
  48         else
  49                 mat4x4_dup(node->abs, node->rel);
  50
  51         list_itr(&node->children, &transform_node, NULL, NULL);
  52 }
  53
  54 static void render_node(ModelNode *node)
  55 {
  56         if (!node->visible)
  57                 return;
  58
  59         if (node->clockwise) {
  60                 glFrontFace(GL_CW); GL_DEBUG
  61         }
  62
  63         for (size_t i = 0; i < node->meshes.siz; i++) {
  64                 ModelMesh *mesh = &((ModelMesh *) node->meshes.ptr)[i];
  65
  66                 if (!mesh->mesh)
  67                         continue;
  68
  69                 glUseProgram(mesh->shader->prog); GL_DEBUG
  70                 glUniformMatrix4fv(mesh->shader->loc_transform, 1, GL_FALSE, node->abs[0]); GL_DEBUG
  71
  72                 // bind textures
  73                 for (GLuint i = 0; i < mesh->num_textures; i++) {
  74                         glBindTextureUnit(i, mesh->textures[i]); GL_DEBUG
  75                 }
  76
  77                 mesh_render(mesh->mesh);
  78         }
  79
  80         list_itr(&node->children, &render_node, NULL, NULL);
  81
  82         if (node->clockwise) {
  83                 glFrontFace(GL_CCW); GL_DEBUG
  84         }
  85 }
  86
  87 static void free_node_meshes(ModelNode *node)
  88 {
  89         for (size_t i = 0; i < node->meshes.siz; i++) {
  90                 ModelMesh *mesh = &((ModelMesh *) node->meshes.ptr)[i];
  91
  92                 mesh_destroy(mesh->mesh);
  93                 free(mesh->mesh);
  94         }
  95
  96         list_clr(&node->children, &free_node_meshes, NULL, NULL);
  97 }
  98
  99 static void delete_node(ModelNode *node)
 100 {
 101         for (size_t i = 0; i < node->meshes.siz; i++) {
 102                 ModelMesh *mesh = &((ModelMesh *) node->meshes.ptr)[i];
 103
 104                 if (mesh->textures)
 105                         free(mesh->textures);
 106         }
 107         list_clr(&node->children, &delete_node, NULL, NULL);
 108         array_clr(&node->meshes);
 109
 110         free(node);
 111 }
 112
 113 static void init_node(ModelNode *node, ModelNode *parent)
 114 {
 115         if ((node->parent = parent))
 116                 list_apd(&parent->children, node);
 117
 118         list_ini(&node->children);
 119 }
 120
 121 static void clone_mesh(ModelMesh *mesh)
 122 {
 123         GLuint *old_textures = mesh->textures;
 124         memcpy(mesh->textures = malloc(mesh->num_textures * sizeof *mesh->textures),
 125                 old_textures, mesh->num_textures * sizeof *mesh->textures);
 126 }
 127
 128 static ModelNode *clone_node(ModelNode *original, ModelNode *parent)
 129 {
 130         ModelNode *node = malloc(sizeof *node);
 131         *node = *original;
 132         init_node(node, parent);
 133
 134         array_cln(&node->meshes, &original->meshes);
 135         for (size_t i = 0; i < node->meshes.siz; i++)
 136                 clone_mesh(&((ModelMesh *) node->meshes.ptr)[i]);
 137
 138         list_itr(&original->children, &clone_node, node, NULL);
 139         return node;
 140 }
 141
 142 static int cmp_model(const Model *model, const f32 *distance)
 143 {
 144         return -f32_cmp(&model->distance, distance);
 145 }
 146
 147 static void render_model(Model *model)
 148 {
 149         if (model->callbacks.before_render)
 150                 model->callbacks.before_render(model);
 151
 152         render_node(model->root);
 153
 154         if (model->callbacks.after_render)
 155                 model->callbacks.after_render(model);
 156 }
 157
 158 // step model help im stuck
 159 static void model_step(Model *model, Tree *transparent, f64 dtime)
 160 {
 161         if (model->callbacks.step)
 162                 model->callbacks.step(model, dtime);
 163
 164         if (client_config.view_distance < (model->distance = sqrt(
 165                         pow(model->root->pos.x - camera.eye[0], 2) +
 166                         pow(model->root->pos.y - camera.eye[1], 2) +
 167                         pow(model->root->pos.z - camera.eye[2], 2))))
 168                 return;
 169
 170         if (!model->root->visible)
 171                 return;
 172
 173         if (model->flags.frustum_culling && frustum_cull((aabb3f32) {
 174                         v3f32_add(model->box.min, model->root->pos),
 175                         v3f32_add(model->box.max, model->root->pos)}))
 176                 return;
 177
 178         // fixme: if there are multiple objects with the exact same distance, only one is rendered
 179         if (model->flags.transparent)
 180                 tree_add(transparent, &model->distance, model, &cmp_model, NULL);
 181         else
 182                 render_model(model);
 183 }
 184
 185 // init
 186 void model_init()
 187 {
 188         list_ini(&scene);
 189         list_ini(&scene_new);
 190
 191         pthread_mutex_init(&lock_scene_new, NULL);
 192         units = opengl_texture_batch_units();
 193 }
 194
 195 // ded
 196 void model_deinit()
 197 {
 198         list_clr(&scene, &model_delete, NULL, NULL);
 199         list_clr(&scene_new, &model_delete, NULL, NULL);
 200
 201         pthread_mutex_destroy(&lock_scene_new);
 202 }
 203
 204 // Model functions
 205
 206 Model *model_create()
 207 {
 208         Model *model = malloc(sizeof *model);
 209         model->root = model_node_create(NULL);
 210         model->extra = NULL;
 211         model->replace = NULL;
 212
 213         model->callbacks.step = NULL;
 214         model->callbacks.before_render = NULL;
 215         model->callbacks.after_render = NULL;
 216         model->callbacks.delete = NULL;
 217
 218         model->flags.delete =
 219                 model->flags.frustum_culling =
 220                 model->flags.transparent = 0;
 221
 222         return model;
 223 }
 224
 225 Model *model_load(const char *path, const char *textures_path, Mesh *cube, ModelShader *shader)
 226 {
 227         Model *model = model_create();
 228
 229         Array stack;
 230         array_ini(&stack, sizeof(ModelNode *), 5);
 231         array_apd(&stack, &model->root);
 232
 233         FILE *file = fopen(path, "r");
 234         if (!file) {
 235                 fprintf(stderr, "[warning] failed to open model %s\n", path);
 236                 return NULL;
 237         }
 238
 239         char *line = NULL;
 240         size_t siz = 0;
 241         ssize_t length;
 242         int count = 0;
 243
 244         while ((length = getline(&line, &siz, file)) > 0) {
 245                 count++;
 246
 247                 if (*line == '#')
 248                         continue;
 249
 250                 char *cursor = line - 1;
 251
 252                 size_t tabs = 0;
 253                 while (*++cursor == '\t')
 254                         tabs++;
 255
 256                 if (tabs >= stack.siz) {
 257                         fprintf(stderr, "[warning] invalid indent in model %s in line %d\n", path, count);
 258                         continue;
 259                 }
 260
 261                 ModelNode *node = model_node_create(((ModelNode **) stack.ptr)[tabs]);
 262
 263                 int n;
 264                 char key[length + 1];
 265                 while (sscanf(cursor, "%s %n", key, &n) == 1) {
 266                         cursor += n;
 267
 268                         if (strcmp(key, "name") == 0) {
 269                                 char name[length + 1];
 270
 271                                 if (sscanf(cursor, "%s %n", name, &n) == 1) {
 272                                         cursor += n;
 273
 274                                         if (node->name)
 275                                                 free(node->name);
 276                                         node->name = strdup(name);
 277                                 } else {
 278                                         fprintf(stderr, "[warning] invalid value for name in model %s in line %d\n", path, count);
 279                                 }
 280                         } else if (strcmp(key, "pos") == 0) {
 281                                 if (sscanf(cursor, "%f %f %f %n", &node->pos.x, &node->pos.y, &node->pos.z, &n) == 3)
 282                                         cursor += n;
 283                                 else
 284                                         fprintf(stderr, "[warning] invalid value for pos in model %s in line %d\n", path, count);
 285                         } else if (strcmp(key, "rot") == 0) {
 286                                 if (sscanf(cursor, "%f %f %f %n", &node->rot.x, &node->rot.y, &node->rot.z, &n) == 3)
 287                                         cursor += n;
 288                                 else
 289                                         fprintf(stderr, "[warning] invalid value for rot in model %s in line %d\n", path, count);
 290
 291                                 node->rot = v3f32_scale(node->rot, M_PI / 180.0);
 292                         } else if (strcmp(key, "scale") == 0) {
 293                                 if (sscanf(cursor, "%f %f %f %n", &node->scale.x, &node->scale.y, &node->scale.z, &n) == 3)
 294                                         cursor += n;
 295                                 else
 296                                         fprintf(stderr, "[warning] invalid value for scale in model %s in line %d\n", path, count);
 297                         } else if (strcmp(key, "clockwise") == 0) {
 298                                 node->clockwise = 1;
 299                         } else if (strcmp(key, "cube") == 0) {
 300                                 char texture[length + 1];
 301
 302                                 if (sscanf(cursor, "%s %n", texture, &n) == 1) {
 303                                         cursor += n;
 304
 305                                         char filepath[strlen(textures_path) + 1 + strlen(texture) + 1];
 306                                         sprintf(filepath, "%s/%s", textures_path, texture);
 307                                         Texture *texture = texture_load_cubemap(filepath, false);
 308
 309                                         model_node_add_mesh(node, &(ModelMesh) {
 310                                                 .mesh = cube,
 311                                                 .textures = &texture->txo,
 312                                                 .num_textures = 1,
 313                                                 .shader = shader,
 314                                         });
 315                                 } else {
 316                                         fprintf(stderr, "[warning] invalid value for cube in model %s in line %d\n", path, count);
 317                                 }
 318                         } else {
 319                                 fprintf(stderr, "[warning] invalid key '%s' in model %s in line %d\n", key, path, count);
 320                         }
 321                 }
 322
 323                 model_node_transform(node);
 324
 325                 stack.siz = tabs + 1;
 326                 array_apd(&stack, &node);
 327         }
 328
 329         if (line)
 330                 free(line);
 331
 332         fclose(file);
 333         array_clr(&stack);
 334
 335         transform_node(model->root);
 336         return model;
 337 }
 338
 339 Model *model_clone(Model *original)
 340 {
 341         Model *model = malloc(sizeof *model);
 342         *model = *original;
 343         model->root = clone_node(original->root, NULL);
 344         return model;
 345 }
 346
 347 void model_delete(Model *model)
 348 {
 349         if (model->callbacks.delete)
 350                 model->callbacks.delete(model);
 351
 352         delete_node(model->root);
 353         free(model);
 354 }
 355
 356 void model_free_meshes(Model *model)
 357 {
 358         free_node_meshes(model->root);
 359 }
 360
 361 void model_get_bones(Model *model, ModelBoneMapping *mappings, size_t num_mappings)
 362 {
 363         char *name, *cursor, *saveptr, *tok;
 364
 365         for (size_t i = 0; i < num_mappings; i++) {
 366                 name = cursor = strdup(mappings[i].name);
 367
 368                 ModelNode *node = model->root;
 369
 370                 while (node && (tok = strtok_r(cursor, ".", &saveptr))) {
 371                         node = list_get(&node->children, tok, &cmp_node, NULL);
 372                         cursor = NULL;
 373                 }
 374
 375                 if (node)
 376                         *mappings[i].node = node;
 377                 else
 378                         fprintf(stderr, "[warning] no such bone: %s\n", mappings[i].name);
 379
 380                 free(name);
 381         }
 382 }
 383
 384 // ModelNode functions
 385
 386 ModelNode *model_node_create(ModelNode *parent)
 387 {
 388         ModelNode *node = malloc(sizeof *node);
 389         node->name = NULL;
 390         node->visible = 1;
 391         node->clockwise = 0;
 392         node->pos = (v3f32) {0.0f, 0.0f, 0.0f};
 393         node->rot = (v3f32) {0.0f, 0.0f, 0.0f};
 394         node->scale = (v3f32) {1.0f, 1.0f, 1.0f};
 395         array_ini(&node->meshes, sizeof(ModelMesh), 0);
 396         init_node(node, parent);
 397         return node;
 398 }
 399
 400 void model_node_transform(ModelNode *node)
 401 {
 402         mat4x4_identity(node->rel);
 403
 404         mat4x4_translate(node->rel,
 405                 node->pos.x,
 406                 node->pos.y,
 407                 node->pos.z);
 408
 409         mat4x4_scale_aniso(node->rel, node->rel,
 410                 node->scale.x,
 411                 node->scale.y,
 412                 node->scale.z);
 413
 414         mat4x4_rotate_X(node->rel, node->rel, node->rot.x);
 415         mat4x4_rotate_Y(node->rel, node->rel, node->rot.y);
 416         mat4x4_rotate_Z(node->rel, node->rel, node->rot.z);
 417
 418         transform_node(node);
 419 }
 420
 421 void model_node_add_mesh(ModelNode *node, const ModelMesh *mesh)
 422 {
 423         array_apd(&node->meshes, mesh);
 424         clone_mesh(&((ModelMesh *) node->meshes.ptr)[node->meshes.siz - 1]);
 425 }
 426
 427 void model_node_add_batch(ModelNode *node, ModelBatch *batch)
 428 {
 429         if (!batch->textures.siz) {
 430                 free(batch);
 431                 return;
 432         }
 433
 434         array_srt(&batch->textures, &cmp_batch_texture);
 435         ModelBatchTexture *textures = batch->textures.ptr;
 436
 437         size_t num_meshes = ceil((double) batch->textures.siz / (double) units);
 438         array_grw(&node->meshes, num_meshes);
 439         ModelMesh *meshes = &((ModelMesh *) node->meshes.ptr)[node->meshes.siz - num_meshes];
 440
 441         for (size_t m = 0; m < num_meshes; m++) {
 442                 ModelMesh *mesh = &meshes[m];
 443
 444                 mesh->mesh = malloc(sizeof *mesh->mesh);
 445                 mesh->mesh->layout = batch->layout;
 446                 mesh->mesh->vao = mesh->mesh->vbo = 0;
 447                 mesh->mesh->free_data = true;
 448
 449                 mesh->textures = malloc(sizeof *mesh->textures * (mesh->num_textures =
 450                         ceil((double) (batch->textures.siz - m) / (double) num_meshes)));
 451
 452                 mesh->shader = batch->shader;
 453
 454                 mesh->mesh->count = 0;
 455                 for (size_t t = 0; t < mesh->num_textures; t++) {
 456                         ModelBatchTexture *texture = &textures[m + t * num_meshes];
 457                         mesh->mesh->count += texture->vertices.siz;
 458                         mesh->textures[t] = texture->texture;
 459
 460                         for (size_t v = 0; v < texture->vertices.siz; v++)
 461                                 *((f32 *) (texture->vertices.ptr + v * texture->vertices.mbs
 462                                         + batch->off_tex_idx)) = t;
 463                 }
 464
 465                 ModelBatchTexture *first = &textures[m];
 466                 first->vertices.cap = mesh->mesh->count;
 467                 first->vertices.ext = 0;
 468                 array_rlc(&first->vertices);
 469
 470                 mesh->mesh->data = first->vertices.ptr;
 471
 472                 for (size_t t = 1; t < mesh->num_textures; t++) {
 473                         ModelBatchTexture *texture = &textures[m + t * num_meshes];
 474                         memcpy(first->vertices.ptr + first->vertices.siz * first->vertices.mbs,
 475                                 texture->vertices.ptr, texture->vertices.siz * texture->vertices.mbs);
 476                         first->vertices.siz += texture->vertices.siz;
 477
 478                         array_clr(&texture->vertices);
 479                 }
 480         }
 481
 482         array_clr(&batch->textures);
 483         free(batch);
 484 }
 485
 486 // ModelBatch functions
 487
 488 ModelBatch *model_batch_create(ModelShader *shader, VertexLayout *layout, size_t off_tex_idx)
 489 {
 490         ModelBatch *batch = malloc(sizeof *batch);
 491         batch->shader = shader;
 492         batch->layout = layout;
 493         batch->off_tex_idx = off_tex_idx;
 494         array_ini(&batch->textures, sizeof(ModelBatchTexture), 5);
 495         return batch;
 496 }
 497
 498 void model_batch_free(ModelBatch *batch)
 499 {
 500         for (size_t i = 0; i < batch->textures.siz; i++)
 501                 array_clr(&((ModelBatchTexture *) batch->textures.ptr)[i].vertices);
 502
 503         array_clr(&batch->textures);
 504         free(batch);
 505 }
 506
 507 void model_batch_add_vertex(ModelBatch *batch, GLuint texture, const void *vertex)
 508 {
 509         ModelBatchTexture *batch_texture = NULL;
 510
 511         for (size_t i = 0; i <= batch->textures.siz; i++) {
 512                 if (i == batch->textures.siz) {
 513                         ModelBatchTexture new;
 514                         new.texture = texture;
 515                         array_ini(&new.vertices, batch->layout->size, 10000);
 516                         array_apd(&batch->textures, &new);
 517                 }
 518
 519                 if ((batch_texture = &((ModelBatchTexture *) batch->textures.ptr)[i])->texture == texture)
 520                         break;
 521         }
 522
 523         array_apd(&batch_texture->vertices, vertex);
 524 }
 525
 526 // scene functions
 527
 528 void model_scene_add(Model *model)
 529 {
 530         pthread_mutex_lock(&lock_scene_new);
 531         list_apd(&scene_new, model);
 532         pthread_mutex_unlock(&lock_scene_new);
 533 }
 534
 535 void model_scene_render(f64 dtime)
 536 {
 537         pthread_mutex_lock(&lock_scene_new);
 538         if (scene_new.fst) {
 539                 *scene.end = scene_new.fst;
 540                 scene.end = scene_new.end;
 541
 542                 list_ini(&scene_new);
 543         }
 544         pthread_mutex_unlock(&lock_scene_new);
 545
 546         Tree transparent;
 547         tree_ini(&transparent);
 548
 549         for (ListNode **node = &scene.fst; *node != NULL;) {
 550                 Model *model = (*node)->dat;
 551
 552                 if (model->flags.delete) {
 553                         if (model->replace)
 554                                 (*node)->dat = model->replace;
 555                         else
 556                                 list_nrm(&scene, node);
 557
 558                         model_delete(model);
 559                 } else {
 560                         node = &(*node)->nxt;
 561                         model_step(model, &transparent, dtime);
 562                 }
 563         }
 564
 565         tree_clr(&transparent, &render_model, NULL, NULL, TRAVERSION_INORDER);
 566 }