model.h

   1 /*
   2  * Copyright (C) 2021-2022 Mt.ZERO Software, Harry Godden - All Rights Reserved
   3  */
   4
   5 #ifndef MODEL_H
   6 #define MODEL_H
   7
   8 #include "common.h"
   9
  10 typedef struct glmesh glmesh;
  11
  12 typedef struct mdl_vert mdl_vert;
  13 typedef struct mdl_submesh mdl_submesh;
  14 typedef struct mdl_material mdl_material;
  15 typedef struct mdl_node mdl_node;
  16 typedef struct mdl_file_header mdl_file_header;
  17 typedef struct mdl_animation mdl_animation;
  18 typedef struct mdl_keyframe mdl_keyframe;
  19 typedef struct mdl_texture mdl_texture;
  20 typedef struct mdl_context mdl_context;
  21
  22 #define MDL_SIZE_MAX          0x1000000
  23 #define MDL_VERT_MAX          1000000
  24 #define MDL_INDICE_MAX        1000000
  25 #define MDL_MATERIAL_MAX      32
  26 #define MDL_NODE_MAX          4000
  27 #define MDL_SUBMESH_MAX       8000
  28 #define MDL_STRING_LENGTH_MAX 64
  29
  30 enum classtype
  31 {
  32    k_classtype_none                 = 0,
  33    k_classtype_gate                 = 1,
  34    k_classtype_spawn                = 3,
  35    k_classtype_water                = 4,
  36    k_classtype_route_node           = 8,
  37    k_classtype_route                = 9,
  38    k_classtype_bone                 = 10,
  39    k_classtype_skeleton             = 11,
  40    k_classtype_skin                 = 12,
  41    k_classtype_audio                = 14,
  42    k_classtype_trigger              = 100,
  43    k_classtype_logic_achievement    = 101,
  44    k_classtype_logic_relay          = 102,
  45    k_classtype_logic_script         = 103,
  46
  47    k_classtype_logic_wire           = 105,
  48    k_classtype_soundscape           = 106,
  49    k_classtype_logic_chances        = 107,
  50    k_classtype_particle_box         = 108,
  51    k_classtype_signal_splitter      = 109,
  52
  53    k_classtype_world_light          = 200,
  54    k_classtype_nonlocal_gate        = 300
  55 };
  56
  57 enum mdl_shader
  58 {
  59    k_shader_standard                = 0,
  60    k_shader_standard_cutout         = 1,
  61    k_shader_terrain_blend           = 2,
  62    k_shader_standard_vertex_blend   = 3,
  63    k_shader_water                   = 4
  64 };
  65
  66 enum mdl_surface_prop
  67 {
  68    k_surface_prop_concrete          = 0,
  69    k_surface_prop_wood              = 1,
  70    k_surface_prop_grass             = 2,
  71    k_surface_prop_tiles             = 3
  72 };
  73
  74 enum material_flag
  75 {
  76    k_material_flag_skate_surface    = 0x1,
  77    k_material_flag_collision        = 0x2,
  78    k_material_flag_grow_grass       = 0x4,
  79    k_material_flag_grind_surface    = 0x8
  80 };
  81
  82 enum bone_flag
  83 {
  84    k_bone_flag_deform               = 0x1,
  85    k_bone_flag_ik                   = 0x2,
  86    k_bone_flag_collider_box         = 0x4,
  87    k_bone_flag_collider_capsule     = 0x8,
  88    k_bone_flag_collider_reserved0   = 0x10,
  89    k_bone_flag_collider_reserved1   = 0x20,
  90    k_bone_flag_collider_reserved2   = 0x40,
  91    k_bone_flag_collider_reserved3   = 0x80,
  92    k_bone_flag_collider_any         = k_bone_flag_collider_box |
  93                                       k_bone_flag_collider_capsule |
  94                                       k_bone_flag_collider_reserved0 |
  95                                       k_bone_flag_collider_reserved1 |
  96                                       k_bone_flag_collider_reserved2 |
  97                                       k_bone_flag_collider_reserved3,
  98    k_bone_flag_cone_constraint      = 0x100,
  99    k_bone_flag_force_u32            = 0xffffffff
 100 };
 101
 102 #pragma pack(push,1)
 103
 104 /* 48 byte */
 105 struct mdl_vert
 106 {
 107    v3f co,        /* 3*32 */
 108        norm;      /* 3*32 */
 109    v2f uv;        /* 2*32 */
 110
 111    u8  colour[4]; /* 4*8 */
 112    u16 weights[4];/* 4*16 */
 113    u8  groups[4]; /* 4*8 */
 114 };
 115
 116 struct mdl_submesh
 117 {
 118    u32 indice_start,
 119        indice_count,
 120        vertex_start,
 121        vertex_count;
 122
 123    boxf bbx;
 124    u32 material_id;
 125 };
 126
 127 struct mdl_texture
 128 {
 129    u32 pstr_name,
 130        pack_offset,
 131        pack_length;
 132 };
 133
 134 struct mdl_material
 135 {
 136    u32 pstr_name,
 137        shader,
 138        flags,
 139        surface_prop;
 140
 141    v4f colour,
 142        colour1;
 143
 144    u32 tex_diffuse,
 145        tex_decal,
 146        tex_normal;
 147 };
 148
 149 struct mdl_node
 150 {
 151    v3f co;
 152    v4f q;
 153    v3f s;
 154
 155    u32 sub_uid,         /* allocated in-file... too bad. */
 156        submesh_start,
 157        submesh_count,
 158        classtype,
 159        offset,
 160        parent,
 161        pstr_name;
 162 };
 163
 164 struct mdl_keyframe
 165 {
 166    v3f co;
 167    v4f q;
 168    v3f s;
 169 };
 170
 171 struct mdl_animation
 172 {
 173    u32 pstr_name,
 174        length;
 175
 176    float rate;
 177
 178    u32 offset;
 179 };
 180
 181 struct mdl_file_header
 182 {
 183    u32 identifier, version, file_length, pad0;
 184
 185    u32
 186        node_count,      node_offset,
 187        submesh_count,   submesh_offset,
 188        material_count,  material_offset,
 189        texture_count,   texture_offset,
 190        anim_count,      anim_offset,
 191        entdata_size,    entdata_offset,
 192        strings_size,    strings_offset,
 193
 194        keyframe_count,  keyframe_offset,
 195
 196        vertex_count,    vertex_offset,
 197        indice_count,    indice_offset,
 198
 199        pack_size,       pack_offset;
 200 };
 201
 202 /*
 203  * Entity data structures
 204  */
 205
 206 struct classtype_gate
 207 {
 208    u32 target;
 209    v3f dims;
 210 };
 211
 212 struct classtype_spawn
 213 {
 214    u32 pstr_alias;
 215 };
 216
 217 struct classtype_water
 218 {
 219    u32 temp;
 220 };
 221
 222 struct classtype_route_node
 223 {
 224    u32 target, target1;
 225 };
 226
 227 struct classtype_route
 228 {
 229    u32 id_start;
 230    u32 pstr_name;
 231    v3f colour;
 232 };
 233
 234 struct classtype_bone
 235 {
 236    u32 flags,
 237        ik_target,
 238        ik_pole;
 239
 240    boxf hitbox;
 241
 242    v3f conevx, conevy, coneva;
 243    float conet;
 244 };
 245
 246 struct classtype_skeleton
 247 {
 248    u32 channels,
 249        ik_count,
 250        collider_count,
 251        anim_start,
 252        anim_count;
 253 };
 254
 255 struct classtype_skin
 256 {
 257    u32 skeleton;
 258 };
 259
 260 struct classtype_trigger
 261 {
 262    u32 target;
 263 };
 264
 265 struct classtype_particle_box
 266 {
 267    u32 target;
 268    float rate;
 269 };
 270
 271 struct classtype_signal_splitter
 272 {
 273    u32 next[4];
 274 };
 275
 276 struct classtype_logic_relay
 277 {
 278    u32 targets[4];
 279 };
 280
 281 struct classtype_logic_achievement
 282 {
 283    u32 pstr_name;
 284 };
 285
 286 struct classtype_audio
 287 {
 288    u32 pstr_file,
 289        flags;
 290
 291    float volume;
 292 };
 293
 294 struct classtype_world_light
 295 {
 296    enum light_type
 297    {
 298       k_light_type_point,
 299       k_light_type_spot,
 300       k_light_type_point_nighttime_only,
 301       k_light_type_spot_nighttime_only
 302    }
 303    type;
 304
 305    v4f colour; /* RGB, Energy */
 306    float angle, range;
 307 };
 308
 309 struct classtype_logic_wire
 310 {
 311    u32 next,
 312        function;
 313
 314    union mdl_128bit_union
 315    {
 316       float _f32;
 317       u32   _u32;
 318       i32   _i32;
 319       v4f   _v4f;
 320    }
 321    data;
 322
 323    enum mdl_128bit_datatype
 324    {
 325       k_mdl_128bit_datatype_nothing = 0u,
 326       k_mdl_128bit_datatype_integer = 1u,
 327       k_mdl_128bit_datatype_number  = 2u,
 328       k_mdl_128bit_datatype_target  = 3u,
 329       k_mdl_128bit_datatype_string  = 4u,
 330       k_mdl_128bit_datatype_vec2    = 5u,
 331       k_mdl_128bit_datatype_vec3    = 6u,
 332       k_mdl_128bit_datatype_vec4    = 7u
 333    }
 334    data_type;
 335
 336    u32 enabled;
 337 };
 338
 339 struct classtype_soundscape
 340 {
 341    u32 max_instances,
 342        allow_transitions;
 343
 344    float transition_duration;
 345    u32 label;
 346 };
 347
 348 struct classtype_logic_chances
 349 {
 350    u32 targets[2];
 351    float p;
 352 };
 353
 354 #pragma pack(pop)
 355
 356
 357 struct mdl_context
 358 {
 359    FILE *file;
 360    mdl_file_header info;
 361
 362    /* each buffer becomes availible after each _load function is called */
 363    mdl_node       *node_buffer;     /* mdl_load_metadata() */
 364    mdl_submesh    *submesh_buffer;
 365    mdl_material   *material_buffer;
 366    mdl_texture    *texture_buffer;
 367    mdl_animation  *anim_buffer;
 368    void           *entdata_buffer;
 369    const char     *string_buffer;
 370
 371    mdl_keyframe   *keyframe_buffer; /* mdl_load_anim_data() */
 372
 373    mdl_vert       *vertex_buffer;   /* mdl_load_mesh_data() */
 374    u32            *index_buffer;
 375
 376    void           *pack;            /* mdl_load_pack_data() */
 377 };
 378
 379 /*
 380  * Simple mesh interface for OpenGL
 381  */
 382
 383 struct glmesh
 384 {
 385    GLuint vao, vbo, ebo;
 386    u32 indice_count;
 387    u32 loaded;
 388 };
 389
 390 VG_STATIC void mesh_upload( glmesh *mesh,
 391                          mdl_vert *verts, u32 vert_count,
 392                          u32 *indices, u32 indice_count )
 393 {
 394    //assert( mesh->loaded == 0 );
 395
 396    glGenVertexArrays( 1, &mesh->vao );
 397    glGenBuffers( 1, &mesh->vbo );
 398    glGenBuffers( 1, &mesh->ebo );
 399    glBindVertexArray( mesh->vao );
 400
 401    size_t stride = sizeof(mdl_vert);
 402
 403    glBindBuffer( GL_ARRAY_BUFFER, mesh->vbo );
 404    glBufferData( GL_ARRAY_BUFFER, vert_count*stride, verts, GL_STATIC_DRAW );
 405
 406    glBindVertexArray( mesh->vao );
 407    glBindBuffer( GL_ELEMENT_ARRAY_BUFFER, mesh->ebo );
 408    glBufferData( GL_ELEMENT_ARRAY_BUFFER, indice_count*sizeof(u32),
 409          indices, GL_STATIC_DRAW );
 410
 411    /* 0: coordinates */
 412    glVertexAttribPointer( 0, 3, GL_FLOAT, GL_FALSE, stride, (void*)0 );
 413    glEnableVertexAttribArray( 0 );
 414
 415    /* 1: normal */
 416    glVertexAttribPointer( 1, 3, GL_FLOAT, GL_FALSE,
 417          stride, (void *)offsetof(mdl_vert, norm) );
 418    glEnableVertexAttribArray( 1 );
 419
 420    /* 2: uv */
 421    glVertexAttribPointer( 2, 2, GL_FLOAT, GL_FALSE,
 422          stride, (void *)offsetof(mdl_vert, uv) );
 423    glEnableVertexAttribArray( 2 );
 424
 425    /* 3: colour */
 426    glVertexAttribPointer( 3, 4, GL_UNSIGNED_BYTE, GL_TRUE,
 427          stride, (void *)offsetof(mdl_vert, colour) );
 428    glEnableVertexAttribArray( 3 );
 429
 430    /* 4: weights */
 431    glVertexAttribPointer( 4, 4, GL_UNSIGNED_SHORT, GL_TRUE,
 432          stride, (void *)offsetof(mdl_vert, weights) );
 433    glEnableVertexAttribArray( 4 );
 434
 435    /* 5: groups */
 436    glVertexAttribIPointer( 5, 4, GL_UNSIGNED_BYTE,
 437          stride, (void *)offsetof(mdl_vert, groups) );
 438    glEnableVertexAttribArray( 5 );
 439
 440    VG_CHECK_GL_ERR();
 441
 442    mesh->indice_count = indice_count;
 443    mesh->loaded = 1;
 444 }
 445
 446 VG_STATIC void mesh_bind( glmesh *mesh )
 447 {
 448    glBindVertexArray( mesh->vao );
 449 }
 450
 451 VG_STATIC void mesh_drawn( u32 start, u32 count )
 452 {
 453    glDrawElements( GL_TRIANGLES, count, GL_UNSIGNED_INT,
 454          (void *)(start*sizeof(u32)) );
 455 }
 456
 457 VG_STATIC void mesh_draw( glmesh *mesh )
 458 {
 459    mesh_drawn( 0, mesh->indice_count );
 460 }
 461
 462 VG_STATIC void mesh_free( glmesh *mesh )
 463 {
 464    if( mesh->loaded )
 465    {
 466       glDeleteVertexArrays( 1, &mesh->vao );
 467       glDeleteBuffers( 1, &mesh->ebo );
 468       glDeleteBuffers( 1, &mesh->vbo );
 469       mesh->loaded = 0;
 470    }
 471 }
 472
 473 VG_STATIC void mdl_load_fatal_corrupt( mdl_context *mdl )
 474 {
 475    fclose( mdl->file );
 476    vg_file_print_invalid( mdl->file );
 477    vg_fatal_exit_loop( "Corrupt model" );
 478 }
 479
 480 /*
 481  * Model implementation
 482  *
 483  * TODO.
 484  *
 485  * you have two api options for loading a model, first, the easy way:
 486  *       mdl_load ...
 487  *    will put the entire model straight into the linear_alloc
 488  *
 489  * or, to target different allocators:
 490  *
 491  *       mdl_open
 492  *       mdl_load_metadata
 493  *       mdl_load_vertex_data
 494  *       mdl_load_indice_data
 495  *       mdl_close
 496  *
 497  * these should ideally be called in quick succession to limit stalls.
 498  */
 499
 500 /*
 501  * if calling mdl_open, and the file does not exist, the game will fatal quit
 502  */
 503 VG_STATIC void mdl_open( mdl_context *mdl, const char *path )
 504 {
 505    memset( mdl, 0, sizeof( mdl_context ) );
 506    mdl->file = fopen( path, "rb" );
 507
 508    if( !mdl->file )
 509    {
 510       vg_error( "mdl_open('%s'): %s\n", path, strerror(errno) );
 511       vg_fatal_exit_loop( "see above for details" );
 512    }
 513
 514    u64 l = fread( &mdl->info, sizeof(mdl_file_header), 1, mdl->file );
 515    if( l != 1 )
 516       mdl_load_fatal_corrupt( mdl );
 517 }
 518
 519 /*
 520  * Load all metadata (everything up until the large buffers). Probs at most 50k
 521  */
 522 VG_STATIC void mdl_load_metadata( mdl_context *mdl, void *lin_alloc )
 523 {
 524    assert( mdl->file );
 525
 526    u64 lheader  = sizeof(mdl_file_header),
 527        ldata    = mdl->info.keyframe_offset - lheader;
 528
 529    void *all_data = vg_linear_alloc( lin_alloc, ldata );
 530
 531    fseek( mdl->file, lheader, SEEK_SET );
 532    u64 l = fread( all_data, ldata, 1, mdl->file );
 533
 534    if( l != 1 )
 535    {
 536       vg_file_print_invalid( mdl->file );
 537       vg_fatal_exit_loop( "Corrupt model" );
 538    }
 539
 540    mdl->node_buffer     = all_data + (mdl->info.node_offset     - lheader);
 541    mdl->submesh_buffer  = all_data + (mdl->info.submesh_offset  - lheader);
 542    mdl->material_buffer = all_data + (mdl->info.material_offset - lheader);
 543    mdl->texture_buffer  = all_data + (mdl->info.texture_offset  - lheader);
 544    mdl->anim_buffer     = all_data + (mdl->info.anim_offset     - lheader);
 545    mdl->entdata_buffer  = all_data + (mdl->info.entdata_offset  - lheader);
 546    mdl->string_buffer   = all_data + (mdl->info.strings_offset  - lheader);
 547 }
 548
 549 /*
 550  * Load just the mesh data
 551  */
 552 VG_STATIC void mdl_load_mesh_data( mdl_context *mdl, void *lin_alloc )
 553 {
 554    assert( mdl->file );
 555
 556    u64 size_verts = vg_align8( mdl->info.vertex_count * sizeof(mdl_vert) ),
 557        size_index = vg_align8( mdl->info.indice_count * sizeof(u32) );
 558
 559    mdl->vertex_buffer = vg_linear_alloc( lin_alloc, size_verts );
 560    mdl->index_buffer  = vg_linear_alloc( lin_alloc, size_index );
 561
 562    {
 563       fseek( mdl->file, mdl->info.vertex_offset, SEEK_SET );
 564       u64 l = fread( mdl->vertex_buffer, size_verts, 1, mdl->file );
 565       if( l != 1 )
 566          mdl_load_fatal_corrupt( mdl );
 567    }
 568    {
 569       fseek( mdl->file, mdl->info.indice_offset, SEEK_SET );
 570       u64 l = fread( mdl->index_buffer, size_index, 1, mdl->file );
 571       if( l != 1 )
 572          mdl_load_fatal_corrupt( mdl );
 573    }
 574 }
 575
 576 /*
 577  * Load animation data
 578  */
 579 VG_STATIC void mdl_load_anim_data( mdl_context *mdl, void *lin_alloc )
 580 {
 581    assert( mdl->file );
 582
 583    if( mdl->info.keyframe_count == 0 )
 584       return;
 585
 586    u64 size_kf = vg_align8( mdl->info.keyframe_count * sizeof(mdl_keyframe) );
 587    mdl->keyframe_buffer = vg_linear_alloc( lin_alloc, size_kf );
 588
 589    fseek( mdl->file, mdl->info.keyframe_offset, SEEK_SET );
 590    u64 l = fread( mdl->keyframe_buffer, size_kf, 1, mdl->file );
 591    if( l != 1 )
 592       mdl_load_fatal_corrupt( mdl );
 593 }
 594
 595 /*
 596  * Load pack contents
 597  *
 598  * TODO request specific files (low)
 599  */
 600 VG_STATIC void mdl_load_pack_data( mdl_context *mdl, void *lin_alloc )
 601 {
 602    assert( mdl->file );
 603
 604    if( mdl->info.pack_size == 0 )
 605       return;
 606
 607    mdl->pack = vg_linear_alloc( lin_alloc, vg_align8( mdl->info.pack_size ) );
 608    fseek( mdl->file, mdl->info.pack_offset, SEEK_SET );
 609
 610    u64 l = fread( mdl->pack, mdl->info.pack_size, 1, mdl->file );
 611    if( l != 1 )
 612       mdl_load_fatal_corrupt( mdl );
 613 }
 614
 615 /*
 616  * close file handle
 617  */
 618 VG_STATIC void mdl_close( mdl_context *mdl )
 619 {
 620    fclose( mdl->file );
 621    mdl->file = NULL;
 622 }
 623
 624 /* open a model. TODO: make this flags ( ANIM_DATA|MESH_DATA ... ) */
 625 VG_STATIC mdl_context *mdl_load_full( void *lin_alloc, const char *path )
 626 {
 627    /* Inspect the header by opening it, give us the size needed */
 628    mdl_context temp_ctx;
 629    mdl_open( &temp_ctx, path );
 630
 631    /* create allocator */
 632    u32 tot_size = temp_ctx.info.file_length + sizeof( mdl_context ) + 64;
 633    void *data = vg_create_linear_allocator( lin_alloc, tot_size,
 634                                             VG_MEMORY_SYSTEM );
 635
 636    /* copy context and load all other data */
 637    mdl_context *ctx = vg_linear_alloc( data, sizeof(mdl_context) );
 638    memcpy( ctx, &temp_ctx, sizeof(mdl_context) );
 639
 640    mdl_load_metadata( ctx, data );
 641    mdl_load_anim_data( ctx, data );
 642    mdl_load_mesh_data( ctx, data );
 643    mdl_load_pack_data( ctx, data );
 644    mdl_close( ctx );
 645
 646    return ctx;
 647 }
 648
 649 /*
 650  * Item getters
 651  * ----------------------------------------------------------------------------
 652  * TODO: Clamp access and oob errors
 653  */
 654 VG_STATIC const char *mdl_pstr( mdl_context *mdl, u32 pstr )
 655 {
 656    return mdl->string_buffer + pstr;
 657 }
 658
 659 VG_STATIC mdl_node *mdl_node_from_id( mdl_context *mdl, u32 id )
 660 {
 661    return &mdl->node_buffer[id];
 662 }
 663
 664 VG_STATIC mdl_node *mdl_node_from_name( mdl_context *mdl, const char *name )
 665 {
 666    for( int i=0; i < mdl->info.node_count; i++ )
 667    {
 668       mdl_node *pnode = mdl_node_from_id( mdl, i );
 669
 670       if( !strcmp( name, mdl_pstr( mdl, pnode->pstr_name )) )
 671          return pnode;
 672    }
 673
 674    return NULL;
 675 }
 676
 677 VG_STATIC mdl_submesh *mdl_node_submesh( mdl_context *mdl,
 678                                          mdl_node *node, u32 i )
 679 {
 680    return &mdl->submesh_buffer[ node->submesh_start+i ];
 681 }
 682
 683 VG_STATIC u32 *mdl_submesh_indices( mdl_context *mdl, mdl_submesh *sm )
 684 {
 685    return &mdl->index_buffer[ sm->indice_start ];
 686 }
 687
 688 VG_STATIC mdl_vert *mdl_submesh_vertices( mdl_context *mdl, mdl_submesh *sm )
 689 {
 690    return &mdl->vertex_buffer[ sm->vertex_start ];
 691 }
 692
 693 VG_STATIC void mdl_node_transform( mdl_node *pnode, m4x3f transform )
 694 {
 695    q_m3x3( pnode->q, transform );
 696    v3_muls( transform[0], pnode->s[0], transform[0] );
 697    v3_muls( transform[1], pnode->s[1], transform[1] );
 698    v3_muls( transform[2], pnode->s[2], transform[2] );
 699    v3_copy( pnode->co, transform[3] );
 700 }
 701
 702 /* upload a mesh based on file submesh */
 703 VG_STATIC void mdl_unpack_submesh( mdl_context *mdl, glmesh *mesh,
 704                                 mdl_submesh *sm )
 705 {
 706    mesh_upload( mesh, mdl_submesh_vertices( mdl, sm ), sm->vertex_count,
 707                       mdl_submesh_indices( mdl, sm ), sm->indice_count );
 708 }
 709
 710 /* upload entire mesh from model */
 711 VG_STATIC void mdl_unpack_glmesh( mdl_context *mdl, glmesh *mesh )
 712 {
 713    u32 offset = mdl->submesh_buffer[0].vertex_count;
 714
 715    for( int i=1; i< mdl->info.submesh_count; i++ )
 716    {
 717       mdl_submesh *sm = &mdl->submesh_buffer[i];
 718       u32 *indices    =  mdl_submesh_indices( mdl, sm );
 719
 720       for( u32 j=0; j<sm->indice_count; j++ )
 721          indices[j] += offset;
 722
 723       offset += sm->vertex_count;
 724    }
 725
 726    mesh_upload( mesh, mdl->vertex_buffer, mdl->info.vertex_count,
 727                       mdl->index_buffer,  mdl->info.indice_count );
 728 }
 729
 730 VG_STATIC void mdl_draw_submesh( mdl_submesh *sm )
 731 {
 732    mesh_drawn( sm->indice_start, sm->indice_count );
 733 }
 734
 735 VG_STATIC void *mdl_get_entdata( mdl_context *mdl, mdl_node *pnode )
 736 {
 737    return mdl->entdata_buffer + pnode->offset;
 738 }
 739
 740 VG_STATIC mdl_keyframe *mdl_get_animdata( mdl_context *mdl, mdl_animation *anim )
 741 {
 742    return mdl->keyframe_buffer + anim->offset;
 743 }
 744
 745 VG_STATIC void mdl_link_materials( mdl_context *root, mdl_context *child )
 746 {
 747    u32 lookup[MDL_MATERIAL_MAX];
 748
 749    for( int i=0; i<child->info.material_count; i++ )
 750    {
 751       mdl_material *mi = &child->material_buffer[i];
 752       const char *si = mdl_pstr( child, mi->pstr_name );
 753
 754       lookup[i] = 0;
 755
 756       for( int j=0; j<root->info.material_count; j++ )
 757       {
 758          mdl_material *mj = &root->material_buffer[j];
 759          const char *sj = mdl_pstr( root, mj->pstr_name );
 760
 761          if( !strcmp( si, sj ) )
 762          {
 763             lookup[i] = j;
 764             break;
 765          }
 766       }
 767
 768       if( lookup[i] == 0 && i != 0 )
 769       {
 770          vg_warn( "Could not link material '%s' (not present in root model)\n",
 771                    si );
 772       }
 773    }
 774
 775    for( int i=0; i<child->info.submesh_count; i++ )
 776    {
 777       mdl_submesh *sm = &child->submesh_buffer[i];
 778       sm->material_id =  lookup[sm->material_id];
 779    }
 780 }
 781
 782 VG_STATIC void mdl_invert_uv_coordinates( mdl_context *mdl )
 783 {
 784    for( int i=0; i<mdl->info.vertex_count; i++ )
 785    {
 786       mdl_vert *vert = &mdl->vertex_buffer[i];
 787       vert->uv[1] = 1.0f-vert->uv[1];
 788    }
 789 }
 790
 791 #endif