world_gen.c

   1 /*
   2  * Copyright (C) 2021-2023 Mt.ZERO Software, Harry Godden - All Rights Reserved
   3  *
   4  * World generation/population. Different to regular loading, since it needs to
   5  * create geometry, apply procedural stuff and save that image to files etc.
   6  */
   7
   8 #ifndef WORLD_GEN_C
   9 #define WORLD_GEN_C
  10
  11 #include "world.h"
  12 #include "world_gen.h"
  13 #include "world_load.h"
  14 #include "world_volumes.h"
  15 #include "world_gate.h"
  16
  17 /*
  18  * Add all triangles from the model, which match the material ID
  19  * applies affine transform to the model
  20  */
  21 VG_STATIC void world_add_all_if_material( m4x3f transform, scene_context *scene,
  22                                           mdl_context *mdl, u32 id )
  23 {
  24    for( u32 i=0; i<mdl_arrcount(&mdl->meshs); i++ ){
  25       mdl_mesh *mesh = mdl_arritm( &mdl->meshs, i );
  26
  27       for( u32 j=0; j<mesh->submesh_count; j++ ){
  28          mdl_submesh *sm = mdl_arritm( &mdl->submeshs, mesh->submesh_start+j );
  29          if( sm->material_id == id ){
  30             m4x3f transform2;
  31             mdl_transform_m4x3( &mesh->transform, transform2 );
  32             m4x3_mul( transform, transform2, transform2 );
  33
  34             scene_add_mdl_submesh( scene, mdl, sm, transform2 );
  35          }
  36       }
  37    }
  38 }
  39
  40 /*
  41  * Adds a small blob shape to the world at a raycast location. This is for the
  42  * grass sprites
  43  *
  44  *   /''''\
  45  *  /      \
  46  * |        |
  47  * |________|
  48  */
  49 VG_STATIC void world_gen_add_blob( scene_context *scene, ray_hit *hit )
  50 {
  51    world_instance *world = world_loading_instance();
  52    m4x3f transform;
  53    v4f qsurface, qrandom;
  54    v3f axis;
  55
  56    v3_cross( (v3f){0.0f,1.0f,0.0f}, hit->normal, axis );
  57
  58    float angle = v3_dot(hit->normal,(v3f){0.0f,1.0f,0.0f});
  59    q_axis_angle( qsurface, axis, angle );
  60    q_axis_angle( qrandom, (v3f){0.0f,1.0f,0.0f}, vg_randf64()*VG_TAUf );
  61    q_mul( qsurface, qrandom, qsurface );
  62    q_m3x3( qsurface, transform );
  63    v3_copy( hit->pos, transform[3] );
  64
  65    scene_vert verts[] =
  66    {
  67       { .co = { -1.00f, 0.0f, 0.0f } },
  68       { .co = {  1.00f, 0.0f, 0.0f } },
  69       { .co = { -1.00f, 1.2f, 0.0f } },
  70       { .co = {  1.00f, 1.2f, 0.0f } },
  71       { .co = { -0.25f, 2.0f, 0.0f } },
  72       { .co = {  0.25f, 2.0f, 0.0f } }
  73    };
  74
  75    const u32 indices[] = { 0,1,3, 0,3,2, 2,3,5, 2,5,4 };
  76
  77    if( scene->vertex_count + vg_list_size(verts) > scene->max_vertices )
  78       vg_fatal_error( "Scene vertex buffer overflow" );
  79
  80    if( scene->indice_count + vg_list_size(indices) > scene->max_indices )
  81       vg_fatal_error( "Scene index buffer overflow" );
  82
  83    scene_vert *dst_verts = &scene->arrvertices[ scene->vertex_count ];
  84    u32 *dst_indices      = &scene->arrindices [ scene->indice_count ];
  85
  86    scene_vert *ref       = &world->scene_geo.arrvertices[ hit->tri[0] ];
  87
  88    for( u32 i=0; i<vg_list_size(verts); i++ )
  89    {
  90       scene_vert *pvert = &dst_verts[ i ],
  91                  *src   = &verts[ i ];
  92
  93       m4x3_mulv( transform, src->co, pvert->co );
  94       scene_vert_pack_norm( pvert, transform[1] );
  95
  96       v2_copy( ref->uv, pvert->uv );
  97    }
  98
  99    for( u32 i=0; i<vg_list_size(indices); i++ )
 100       dst_indices[i] = indices[i] + scene->vertex_count;
 101
 102    scene->vertex_count += vg_list_size(verts);
 103    scene->indice_count += vg_list_size(indices);
 104 }
 105
 106 /*
 107  * Sprinkle foliage models over the map on terrain material
 108  */
 109 VG_STATIC void world_apply_procedural_foliage( scene_context *scene,
 110                                                struct world_surface *mat )
 111 {
 112    if( vg.quality_profile == k_quality_profile_low )
 113       return;
 114
 115    world_instance *world = world_loading_instance();
 116    vg_info( "Applying foliage (%u)\n", mat->info.pstr_name );
 117
 118    v3f volume;
 119    v3_sub( world->scene_geo.bbx[1], world->scene_geo.bbx[0], volume );
 120    volume[1] = 1.0f;
 121
 122    int count = 0;
 123
 124    float area = volume[0]*volume[2];
 125    u32 particles = 0.08f * area;
 126
 127    /* TODO: Quasirandom? */
 128    vg_info( "Map area: %f. Max particles: %u\n", area, particles );
 129
 130    for( u32 i=0; i<particles; i++ ){
 131       v3f pos;
 132       v3_mul( volume, (v3f){ vg_randf64(), 1000.0f, vg_randf64() }, pos );
 133       pos[1] = 1000.0f;
 134       v3_add( pos, world->scene_geo.bbx[0], pos );
 135
 136       ray_hit hit;
 137       hit.dist = INFINITY;
 138
 139       if( ray_world( world, pos, (v3f){0.0f,-1.0f,0.0f}, &hit )){
 140          struct world_surface *m1 = ray_hit_surface( world, &hit );
 141          if((hit.normal[1] > 0.8f) && (m1 == mat) && (hit.pos[1] > 0.0f+10.0f)){
 142             world_gen_add_blob( scene, &hit );
 143             count ++;
 144          }
 145       }
 146    }
 147
 148    vg_info( "%d foliage models added\n", count );
 149 }
 150
 151 /*
 152  * Create the main meshes for the world
 153  */
 154 VG_STATIC void world_gen_generate_meshes(void)
 155 {
 156    /*
 157     * Compile meshes into the world scenes
 158     */
 159    world_instance *world = world_loading_instance();
 160    scene_init( &world->scene_geo, 320000, 1200000 );
 161    u32 buf_size = scene_mem_required( &world->scene_geo );
 162    u8 *buffer = vg_linear_alloc( world->heap, buf_size );
 163    scene_supply_buffer( &world->scene_geo, buffer );
 164
 165    m4x3f midentity;
 166    m4x3_identity( midentity );
 167
 168    /*
 169     * Generate scene: collidable geometry
 170     * ----------------------------------------------------------------
 171     */
 172
 173    vg_info( "Generating collidable geometry\n" );
 174
 175    for( u32 i=0; i<world->surface_count; i++ ){
 176       struct world_surface *surf = &world->surfaces[ i ];
 177
 178       if( surf->info.flags & k_material_flag_collision )
 179          world_add_all_if_material( midentity, &world->scene_geo,
 180                                     &world->meta, i );
 181
 182       scene_copy_slice( &world->scene_geo, &surf->sm_geo );
 183    }
 184
 185    /* compress that bad boy */
 186    u32 new_vert_max = world->scene_geo.vertex_count,
 187        new_vert_size = vg_align8(new_vert_max*sizeof(scene_vert)),
 188        new_indice_len = world->scene_geo.indice_count*sizeof(u32);
 189
 190    u32 *src_indices = world->scene_geo.arrindices,
 191        *dst_indices = (u32 *)(buffer + new_vert_size);
 192
 193    memmove( dst_indices, src_indices, new_indice_len );
 194
 195    world->scene_geo.max_indices = world->scene_geo.indice_count;
 196    world->scene_geo.max_vertices = world->scene_geo.vertex_count;
 197    buf_size = scene_mem_required( &world->scene_geo );
 198
 199    buffer = vg_linear_resize( world->heap, buffer, buf_size );
 200
 201    world->scene_geo.arrvertices = (scene_vert *)(buffer);
 202    world->scene_geo.arrindices = (u32 *)(buffer + new_vert_size);
 203
 204    scene_upload_async( &world->scene_geo, &world->mesh_geo );
 205
 206    /* need send off the memory to the gpu before we can create the bvh. */
 207    vg_async_stall();
 208    vg_info( "creating bvh\n" );
 209
 210    /* setup spacial mapping and rigidbody */
 211    world->geo_bh = scene_bh_create( world->heap, &world->scene_geo );
 212
 213    v3_zero( world->rb_geo.rb.co );
 214    v3_zero( world->rb_geo.rb.v );
 215    q_identity( world->rb_geo.rb.q );
 216    v3_zero( world->rb_geo.rb.w );
 217
 218    world->rb_geo.type = k_rb_shape_scene;
 219    world->rb_geo.inf.scene.bh_scene = world->geo_bh;
 220    rb_init_object( &world->rb_geo );
 221
 222    /*
 223     * Generate scene: non-collidable geometry
 224     * ----------------------------------------------------------------
 225     */
 226    vg_info( "Generating non-collidable geometry\n" );
 227
 228    vg_async_item *call = scene_alloc_async( &world->scene_no_collide,
 229                                             &world->mesh_no_collide,
 230                                             200000, 500000 );
 231
 232    for( u32 i=0; i<world->surface_count; i++ ){
 233       struct world_surface *surf = &world->surfaces[ i ];
 234
 235       if( !(surf->info.flags & k_material_flag_collision) ){
 236          world_add_all_if_material( midentity,
 237                                     &world->scene_no_collide, &world->meta, i );
 238       }
 239
 240       if( surf->info.flags & k_material_flag_grow_grass )
 241          world_apply_procedural_foliage( &world->scene_no_collide, surf );
 242
 243       scene_copy_slice( &world->scene_no_collide, &surf->sm_no_collide );
 244    }
 245
 246    for( u32 i=0; i<mdl_arrcount( &world->ent_traffic ); i++ ){
 247       ent_traffic *vehc = mdl_arritm( &world->ent_traffic, i );
 248
 249       for( u32 j=0; j<vehc->submesh_count; j++ ){
 250          mdl_submesh *sm = mdl_arritm( &world->meta.submeshs,
 251                                        vehc->submesh_start+j );
 252
 253          if( sm->flags & k_submesh_flag_consumed ){
 254             continue;
 255          }
 256
 257          m4x3f identity;
 258          m4x3_identity( identity );
 259          scene_add_mdl_submesh( &world->scene_no_collide,
 260                                 &world->meta, sm, identity );
 261
 262          scene_copy_slice( &world->scene_no_collide, sm );
 263          sm->flags |= k_submesh_flag_consumed;
 264       }
 265    }
 266
 267    vg_async_dispatch( call, async_scene_upload );
 268 }
 269
 270 /* signed distance function for cone */
 271 static f32 fsd_cone_infinite( v3f p, v2f c )
 272 {
 273    v2f q = { v2_length( (v2f){ p[0], p[2] } ), -p[1] };
 274    float s = vg_maxf( 0.0f, v2_dot( q, c ) );
 275
 276    v2f v0;
 277    v2_muls( c, s, v0 );
 278    v2_sub( q, v0, v0 );
 279
 280    float d = v2_length( v0 );
 281    return d * ((q[0]*c[1]-q[1]*c[0]<0.0f)?-1.0f:1.0f);
 282 }
 283
 284 struct light_indices_upload_info{
 285    world_instance *world;
 286    v3i count;
 287
 288    void *data;
 289 };
 290
 291 /*
 292  * Async reciever to buffer light index data
 293  */
 294 VG_STATIC void async_upload_light_indices( void *payload, u32 size )
 295 {
 296    struct light_indices_upload_info *info = payload;
 297
 298    glGenTextures( 1, &info->world->tex_light_cubes );
 299    glBindTexture( GL_TEXTURE_3D, info->world->tex_light_cubes );
 300    glTexImage3D( GL_TEXTURE_3D, 0, GL_RG32UI,
 301                  info->count[0], info->count[1], info->count[2],
 302                  0, GL_RG_INTEGER, GL_UNSIGNED_INT, info->data );
 303    glTexParameteri( GL_TEXTURE_3D, GL_TEXTURE_MIN_FILTER, GL_NEAREST );
 304    glTexParameteri( GL_TEXTURE_3D, GL_TEXTURE_MAG_FILTER, GL_NEAREST );
 305 }
 306
 307 /*
 308  * Computes light indices for world
 309  */
 310 VG_STATIC void world_gen_compute_light_indices(void)
 311 {
 312    /* light cubes */
 313    world_instance *world = world_loading_instance();
 314    v3f cubes_min, cubes_max;
 315    v3_muls( world->scene_geo.bbx[0], 1.0f/k_world_light_cube_size, cubes_min );
 316    v3_muls( world->scene_geo.bbx[1], 1.0f/k_world_light_cube_size, cubes_max );
 317
 318    v3_sub( cubes_min, (v3f){ 0.5f, 0.5f, 0.5f }, cubes_min );
 319    v3_add( cubes_max, (v3f){ 0.5f, 0.5f, 0.5f }, cubes_max );
 320
 321    v3_floor( cubes_min, cubes_min );
 322    v3_floor( cubes_max, cubes_max );
 323
 324    v3i icubes_min, icubes_max;
 325
 326    for( int i=0; i<3; i++ ){
 327       icubes_min[i] = cubes_min[i];
 328       icubes_max[i] = cubes_max[i];
 329    }
 330
 331    v3f cube_size;
 332
 333    v3i icubes_count;
 334    v3i_sub( icubes_max, icubes_min, icubes_count );
 335
 336    for( int i=0; i<3; i++ ){
 337       int clamped_count = VG_MIN( 128, icubes_count[i]+1 );
 338       float clamped_max = icubes_min[i] + clamped_count,
 339                     max = icubes_min[i] + icubes_count[i]+1;
 340
 341       icubes_count[i] = clamped_count;
 342       cube_size[i] = (max / clamped_max) * k_world_light_cube_size;
 343       cubes_max[i] = clamped_max;
 344    }
 345
 346    v3_mul( cubes_min, cube_size, cubes_min );
 347    v3_mul( cubes_max, cube_size, cubes_max );
 348
 349    for( int i=0; i<3; i++ ){
 350       float range = cubes_max[i]-cubes_min[i];
 351       world->ub_lighting.g_cube_inv_range[i] = 1.0f / range;
 352       world->ub_lighting.g_cube_inv_range[i] *= (float)icubes_count[i];
 353
 354       vg_info( "cubes[%d]: %d\n", i, icubes_count[i] );
 355    }
 356
 357    int total_cubes = icubes_count[0]*icubes_count[1]*icubes_count[2];
 358
 359    u32 data_size = vg_align8(total_cubes*sizeof(u32)*2),
 360        hdr_size  = vg_align8(sizeof(struct light_indices_upload_info));
 361
 362    vg_async_item *call = vg_async_alloc( data_size + hdr_size );
 363    struct light_indices_upload_info *info = call->payload;
 364    info->data = ((u8*)call->payload) + hdr_size;
 365    info->world = world;
 366    u32 *cubes_index = info->data;
 367
 368    for( int i=0; i<3; i++ )
 369       info->count[i] = icubes_count[i];
 370
 371    vg_info( "Computing light cubes (%d) [%f %f %f] -> [%f %f %f]\n",
 372              total_cubes, cubes_min[0], -cubes_min[2], cubes_min[1],
 373                           cubes_max[0], -cubes_max[2], cubes_max[1] );
 374    v3_copy( cubes_min, world->ub_lighting.g_cube_min );
 375
 376    float bound_radius = v3_length( cube_size );
 377
 378    for( int iz = 0; iz<icubes_count[2]; iz ++ ){
 379       for( int iy = 0; iy<icubes_count[1]; iy++ ){
 380          for( int ix = 0; ix<icubes_count[0]; ix++ ){
 381             boxf bbx;
 382             v3_div( (v3f){ ix, iy, iz }, world->ub_lighting.g_cube_inv_range,
 383                   bbx[0] );
 384             v3_div( (v3f){ ix+1, iy+1, iz+1 },
 385                   world->ub_lighting.g_cube_inv_range,
 386                   bbx[1] );
 387
 388             v3_add( bbx[0], world->ub_lighting.g_cube_min, bbx[0] );
 389             v3_add( bbx[1], world->ub_lighting.g_cube_min, bbx[1] );
 390
 391             v3f center;
 392             v3_add( bbx[0], bbx[1], center );
 393             v3_muls( center, 0.5f, center );
 394
 395             u32 indices[6] = { 0, 0, 0, 0, 0, 0 };
 396             u32 count = 0;
 397
 398             float influences[6] = { 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f };
 399             const int N = vg_list_size( influences );
 400
 401             for( u32 j=0; j<mdl_arrcount(&world->ent_light); j ++ ){
 402                ent_light *light = mdl_arritm( &world->ent_light, j );
 403                v3f closest;
 404                closest_point_aabb( light->transform.co, bbx, closest );
 405
 406                float dist = v3_dist( closest, light->transform.co ),
 407                      influence = 1.0f/(dist+1.0f);
 408
 409                if( dist > light->range )
 410                   continue;
 411
 412                if( light->type == k_light_type_spot){
 413                   v3f local;
 414                   m4x3_mulv( light->inverse_world, center, local );
 415
 416                   float r = fsd_cone_infinite( local, light->angle_sin_cos );
 417
 418                   if( r > bound_radius )
 419                      continue;
 420                }
 421
 422                int best_pos = N;
 423                for( int k=best_pos-1; k>=0; k -- )
 424                   if( influence > influences[k] )
 425                      best_pos = k;
 426
 427                if( best_pos < N ){
 428                   for( int k=N-1; k>best_pos; k -- ){
 429                      influences[k] = influences[k-1];
 430                      indices[k] = indices[k-1];
 431                   }
 432
 433                   influences[best_pos] = influence;
 434                   indices[best_pos] = j;
 435                }
 436             }
 437
 438             for( int j=0; j<N; j++ )
 439                if( influences[j] > 0.0f )
 440                   count ++;
 441
 442             int base_index = iz * (icubes_count[0]*icubes_count[1]) +
 443                              iy * (icubes_count[0]) +
 444                              ix;
 445
 446             int lower_count = VG_MIN( 3, count );
 447             u32 packed_index_lower = lower_count;
 448             packed_index_lower |= indices[0]<<2;
 449             packed_index_lower |= indices[1]<<12;
 450             packed_index_lower |= indices[2]<<22;
 451
 452             int upper_count = VG_MAX( 0, count - lower_count );
 453             u32 packed_index_upper = upper_count;
 454             packed_index_upper |= indices[3]<<2;
 455             packed_index_upper |= indices[4]<<12;
 456             packed_index_upper |= indices[5]<<22;
 457
 458             cubes_index[ base_index*2 + 0 ] = packed_index_lower;
 459             cubes_index[ base_index*2 + 1 ] = packed_index_upper;
 460          }
 461       }
 462    }
 463
 464    vg_async_dispatch( call, async_upload_light_indices );
 465 }
 466
 467 /*
 468  * Rendering pass needed to complete the world
 469  */
 470 VG_STATIC void async_world_postprocess_render( void *payload, u32 _size )
 471 {
 472    /* create scene lighting buffer */
 473    world_instance *world = world_loading_instance();
 474
 475    u32 size = VG_MAX(mdl_arrcount(&world->ent_light),1) * sizeof(float)*12;
 476    vg_info( "Upload %ubytes (lighting)\n", size );
 477
 478    glGenBuffers( 1, &world->tbo_light_entities );
 479    glBindBuffer( GL_TEXTURE_BUFFER, world->tbo_light_entities );
 480    glBufferData( GL_TEXTURE_BUFFER, size, NULL, GL_DYNAMIC_DRAW );
 481
 482    /* buffer layout
 483     *
 484     *  colour               position                direction (spots)
 485     * | .   .   .   .     | .   .   .   .         | .   .   .   .  |
 486     * | Re  Ge  Be  Night | Xco Yco Zco Range     | Dx  Dy  Dz  Da |
 487     *
 488     */
 489
 490    v4f *light_dst = glMapBuffer( GL_TEXTURE_BUFFER, GL_WRITE_ONLY );
 491    for( u32 i=0; i<mdl_arrcount(&world->ent_light); i++ ){
 492       ent_light *light = mdl_arritm( &world->ent_light, i );
 493
 494       /* colour  + night */
 495       v3_muls( light->colour, light->colour[3] * 2.0f, light_dst[i*3+0] );
 496       light_dst[i*3+0][3] = 2.0f;
 497
 498       if( !light->daytime ){
 499          u32 hash = (i * 29986577u) & 0xffu;
 500          float switch_on = hash;
 501                switch_on *= (1.0f/255.0f);
 502
 503          light_dst[i*3+0][3] = 0.44f + switch_on * 0.015f;
 504       }
 505
 506       /* position + 1/range^2 */
 507       v3_copy( light->transform.co, light_dst[i*3+1] );
 508       light_dst[i*3+1][3] = 1.0f/(light->range*light->range);
 509
 510       /* direction + angle */
 511       q_mulv( light->transform.q, (v3f){0.0f,-1.0f,0.0f}, light_dst[i*3+2]);
 512       light_dst[i*3+2][3] = cosf( light->angle );
 513    }
 514
 515    glUnmapBuffer( GL_TEXTURE_BUFFER );
 516
 517    glGenTextures( 1, &world->tex_light_entities );
 518    glBindTexture( GL_TEXTURE_BUFFER, world->tex_light_entities );
 519    glTexBuffer( GL_TEXTURE_BUFFER, GL_RGBA32F, world->tbo_light_entities );
 520
 521    /* Upload lighting uniform buffer */
 522    if( world->water.enabled )
 523       v4_copy( world->water.plane, world->ub_lighting.g_water_plane );
 524
 525    v4f info_vec;
 526    v3f *bounds = world->scene_geo.bbx;
 527
 528    info_vec[0] = bounds[0][0];
 529    info_vec[1] = bounds[0][2];
 530    info_vec[2] = 1.0f/ (bounds[1][0]-bounds[0][0]);
 531    info_vec[3] = 1.0f/ (bounds[1][2]-bounds[0][2]);
 532    v4_copy( info_vec, world->ub_lighting.g_depth_bounds );
 533
 534    /*
 535     * Rendering the depth map
 536     */
 537    camera ortho;
 538
 539    v3f extent;
 540    v3_sub( world->scene_geo.bbx[1], world->scene_geo.bbx[0], extent );
 541
 542    float fl = world->scene_geo.bbx[0][0],
 543          fr = world->scene_geo.bbx[1][0],
 544          fb = world->scene_geo.bbx[0][2],
 545          ft = world->scene_geo.bbx[1][2],
 546          rl = 1.0f / (fr-fl),
 547          tb = 1.0f / (ft-fb);
 548
 549    m4x4_zero( ortho.mtx.p );
 550    ortho.mtx.p[0][0] = 2.0f * rl;
 551    ortho.mtx.p[2][1] = 2.0f * tb;
 552    ortho.mtx.p[3][0] = (fr + fl) * -rl;
 553    ortho.mtx.p[3][1] = (ft + fb) * -tb;
 554    ortho.mtx.p[3][3] = 1.0f;
 555    m4x3_identity( ortho.transform );
 556    camera_update_view( &ortho );
 557    camera_finalize( &ortho );
 558
 559    glDisable(GL_DEPTH_TEST);
 560    glDisable(GL_BLEND);
 561    glDisable(GL_CULL_FACE);
 562    render_fb_bind( &world->heightmap, 0 );
 563    shader_blitcolour_use();
 564    shader_blitcolour_uColour( (v4f){-9999.0f,-9999.0f,-9999.0f,-9999.0f} );
 565    render_fsquad();
 566
 567    glEnable(GL_BLEND);
 568    glBlendFunc(GL_ONE, GL_ONE);
 569    glBlendEquation(GL_MAX);
 570
 571    render_world_position( world, &ortho );
 572    glDisable(GL_BLEND);
 573    glEnable(GL_DEPTH_TEST);
 574    glBindFramebuffer( GL_FRAMEBUFFER, 0 );
 575
 576    /* upload full buffer */
 577    glBindBuffer( GL_UNIFORM_BUFFER, world->ubo_lighting );
 578    glBufferSubData( GL_UNIFORM_BUFFER, 0,
 579                     sizeof(struct ub_world_lighting), &world->ub_lighting );
 580 }
 581
 582 /* Loads textures from the pack file */
 583 VG_STATIC void world_gen_load_surfaces(void)
 584 {
 585    world_instance *world = world_loading_instance();
 586    vg_info( "Loading textures\n" );
 587    world->texture_count = 0;
 588
 589    world->texture_count = world->meta.textures.count+1;
 590    world->textures = vg_linear_alloc( world->heap,
 591                               vg_align8(sizeof(GLuint)*world->texture_count) );
 592
 593    vg_tex2d_replace_with_error( &world->textures[0] );
 594
 595    for( u32 i=0; i<mdl_arrcount(&world->meta.textures); i++ ){
 596       mdl_texture *tex = mdl_arritm( &world->meta.textures, i );
 597
 598       if( !tex->file.pack_size ){
 599          vg_fatal_error( "World models must have packed textures!" );
 600       }
 601
 602       vg_linear_clear( vg_mem.scratch );
 603       void *src_data = vg_linear_alloc( vg_mem.scratch,
 604                                         tex->file.pack_size );
 605       mdl_fread_pack_file( &world->meta, &tex->file, src_data );
 606
 607       vg_tex2d_load_qoi_async( src_data, tex->file.pack_size,
 608                                VG_TEX2D_NEAREST|VG_TEX2D_REPEAT,
 609                                &world->textures[i+1] );
 610    }
 611
 612    vg_info( "Loading materials\n" );
 613
 614    world->surface_count = world->meta.materials.count+1;
 615    world->surfaces = vg_linear_alloc( world->heap,
 616                vg_align8(sizeof(struct world_surface)*world->surface_count) );
 617
 618    /* error material */
 619    struct world_surface *errmat = &world->surfaces[0];
 620    memset( errmat, 0, sizeof(struct world_surface) );
 621
 622    for( u32 i=0; i<mdl_arrcount(&world->meta.materials); i++ ){
 623       world->surfaces[i+1].info =
 624          *(mdl_material *)mdl_arritm( &world->meta.materials, i );
 625    }
 626 }
 627
 628 #endif /* WORLD_GEN_C */