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