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 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 static void world_gen_add_blob( world_instance *world,
  50                                    scene_context *scene, ray_hit *hit )
  51 {
  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       scene_vert *pvert = &dst_verts[ i ],
  90                  *src   = &verts[ i ];
  91
  92       m4x3_mulv( transform, src->co, pvert->co );
  93       scene_vert_pack_norm( pvert, transform[1], 0.0f );
  94
  95       v2_copy( ref->uv, pvert->uv );
  96    }
  97
  98    for( u32 i=0; i<vg_list_size(indices); i++ )
  99       dst_indices[i] = indices[i] + scene->vertex_count;
 100
 101    scene->vertex_count += vg_list_size(verts);
 102    scene->indice_count += vg_list_size(indices);
 103 }
 104
 105 /*
 106  * Sprinkle foliage models over the map on terrain material
 107  */
 108 static void world_apply_procedural_foliage( world_instance *world,
 109                                                scene_context *scene,
 110                                                struct world_surface *mat )
 111 {
 112    if( vg.quality_profile == k_quality_profile_low )
 113       return;
 114
 115    vg_info( "Applying foliage (%u)\n", mat->info.pstr_name );
 116
 117    v3f volume;
 118    v3_sub( world->scene_geo.bbx[1], world->scene_geo.bbx[0], volume );
 119    volume[1] = 1.0f;
 120
 121    int count = 0;
 122
 123    float area = volume[0]*volume[2];
 124    u32 particles = 0.08f * area;
 125
 126    /* TODO: Quasirandom? */
 127    vg_info( "Map area: %f. Max particles: %u\n", area, particles );
 128
 129    for( u32 i=0; i<particles; i++ ){
 130       v3f pos;
 131       v3_mul( volume, (v3f){ vg_randf64(), 1000.0f, vg_randf64() }, pos );
 132       pos[1] = 1000.0f;
 133       v3_add( pos, world->scene_geo.bbx[0], pos );
 134
 135       ray_hit hit;
 136       hit.dist = INFINITY;
 137
 138       if( ray_world( world, pos, (v3f){0.0f,-1.0f,0.0f}, &hit,
 139                      k_material_flag_ghosts )){
 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( world, scene, &hit );
 143             count ++;
 144          }
 145       }
 146    }
 147
 148    vg_info( "%d foliage models added\n", count );
 149 }
 150
 151 static
 152 void world_unpack_submesh_dynamic( world_instance *world,
 153                                    scene_context *scene, mdl_submesh *sm ){
 154    if( sm->flags & k_submesh_flag_consumed ) return;
 155
 156    m4x3f identity;
 157    m4x3_identity( identity );
 158    scene_add_mdl_submesh( scene, &world->meta, sm, identity );
 159
 160    scene_copy_slice( scene, sm );
 161    sm->flags |= k_submesh_flag_consumed;
 162 }
 163
 164 /*
 165  * Create the main meshes for the world
 166  */
 167 static void world_gen_generate_meshes( world_instance *world ){
 168    /*
 169     * Compile meshes into the world scenes
 170     */
 171    scene_init( &world->scene_geo, 320000, 1200000 );
 172    u32 buf_size = scene_mem_required( &world->scene_geo );
 173    u8 *buffer = vg_linear_alloc( world->heap, buf_size );
 174    scene_supply_buffer( &world->scene_geo, buffer );
 175
 176    m4x3f midentity;
 177    m4x3_identity( midentity );
 178
 179    /*
 180     * Generate scene: collidable geometry
 181     * ----------------------------------------------------------------
 182     */
 183
 184    vg_info( "Generating collidable geometry\n" );
 185
 186    for( u32 i=0; i<world->surface_count; i++ ){
 187       struct world_surface *surf = &world->surfaces[ i ];
 188
 189       if( surf->info.flags & k_material_flag_collision )
 190          world_add_all_if_material( midentity, &world->scene_geo,
 191                                     &world->meta, i );
 192
 193       scene_copy_slice( &world->scene_geo, &surf->sm_geo );
 194       scene_set_vertex_flags( &world->scene_geo,
 195                               surf->sm_geo.vertex_start,
 196                               surf->sm_geo.vertex_count,
 197                               (u16)(surf->info.flags & 0xffff) );
 198    }
 199
 200    /* compress that bad boy */
 201    u32 new_vert_max = world->scene_geo.vertex_count,
 202        new_vert_size = vg_align8(new_vert_max*sizeof(scene_vert)),
 203        new_indice_len = world->scene_geo.indice_count*sizeof(u32);
 204
 205    u32 *src_indices = world->scene_geo.arrindices,
 206        *dst_indices = (u32 *)(buffer + new_vert_size);
 207
 208    memmove( dst_indices, src_indices, new_indice_len );
 209
 210    world->scene_geo.max_indices = world->scene_geo.indice_count;
 211    world->scene_geo.max_vertices = world->scene_geo.vertex_count;
 212    buf_size = scene_mem_required( &world->scene_geo );
 213
 214    buffer = vg_linear_resize( world->heap, buffer, buf_size );
 215
 216    world->scene_geo.arrvertices = (scene_vert *)(buffer);
 217    world->scene_geo.arrindices = (u32 *)(buffer + new_vert_size);
 218
 219    scene_upload_async( &world->scene_geo, &world->mesh_geo );
 220
 221    /* need send off the memory to the gpu before we can create the bvh. */
 222    vg_async_stall();
 223    vg_info( "creating bvh\n" );
 224
 225    /* setup spacial mapping and rigidbody */
 226    world->geo_bh = scene_bh_create( world->heap, &world->scene_geo );
 227
 228    v3_zero( world->rb_geo.rb.co );
 229    v3_zero( world->rb_geo.rb.v );
 230    q_identity( world->rb_geo.rb.q );
 231    v3_zero( world->rb_geo.rb.w );
 232
 233    world->rb_geo.type = k_rb_shape_scene;
 234    world->rb_geo.inf.scene.bh_scene = world->geo_bh;
 235    rb_init_object( &world->rb_geo );
 236
 237    /*
 238     * Generate scene: non-collidable geometry
 239     * ----------------------------------------------------------------
 240     */
 241    vg_info( "Generating non-collidable geometry\n" );
 242
 243    vg_async_item *call = scene_alloc_async( &world->scene_no_collide,
 244                                             &world->mesh_no_collide,
 245                                             250000, 500000 );
 246
 247    for( u32 i=0; i<world->surface_count; i++ ){
 248       struct world_surface *surf = &world->surfaces[ i ];
 249
 250       if( !(surf->info.flags & k_material_flag_collision) ){
 251          world_add_all_if_material( midentity,
 252                                     &world->scene_no_collide, &world->meta, i );
 253       }
 254
 255       if( surf->info.flags & k_material_flag_grow_grass ){
 256          world_apply_procedural_foliage( world, &world->scene_no_collide,
 257                                          surf );
 258       }
 259
 260       scene_copy_slice( &world->scene_no_collide, &surf->sm_no_collide );
 261    }
 262
 263    /* unpack traffic models.. TODO: should we just put all these submeshes in a
 264     * dynamic models list? and then the actual entitities point to the
 265     * models. we only have 2 types at the moment which need dynamic models but
 266     * would make sense to do this when/if we have more.
 267     */
 268    for( u32 i=0; i<mdl_arrcount( &world->ent_traffic ); i++ ){
 269       ent_traffic *vehc = mdl_arritm( &world->ent_traffic, i );
 270
 271       for( u32 j=0; j<vehc->submesh_count; j++ ){
 272          mdl_submesh *sm = mdl_arritm( &world->meta.submeshs,
 273                                        vehc->submesh_start+j );
 274          world_unpack_submesh_dynamic( world, &world->scene_no_collide, sm );
 275       }
 276    }
 277
 278    /* unpack challenge models */
 279    for( u32 i=0; i<mdl_arrcount( &world->ent_objective ); i++ ){
 280       ent_objective *objective = mdl_arritm( &world->ent_objective, i );
 281
 282       for( u32 j=0; j<objective->submesh_count; j ++ ){
 283          mdl_submesh *sm = mdl_arritm( &world->meta.submeshs,
 284                                        objective->submesh_start+j );
 285          world_unpack_submesh_dynamic( world, &world->scene_no_collide, sm );
 286       }
 287    }
 288
 289    /* unpack region models */
 290    for( u32 i=0; i<mdl_arrcount( &world->ent_region ); i++ ){
 291       ent_region *region = mdl_arritm( &world->ent_region, i );
 292
 293       for( u32 j=0; j<region->submesh_count; j ++ ){
 294          mdl_submesh *sm = mdl_arritm( &world->meta.submeshs,
 295                                        region->submesh_start+j );
 296          world_unpack_submesh_dynamic( world, &world->scene_no_collide, sm );
 297       }
 298    }
 299
 300    /* unpack gate models */
 301    for( u32 i=0; i<mdl_arrcount( &world->ent_gate ); i++ ){
 302       ent_gate *gate = mdl_arritm( &world->ent_gate, i );
 303
 304       if( !(gate->flags & k_ent_gate_custom_mesh) ) continue;
 305
 306       for( u32 j=0; j<gate->submesh_count; j ++ ){
 307          mdl_submesh *sm = mdl_arritm( &world->meta.submeshs,
 308                                        gate->submesh_start+j );
 309          world_unpack_submesh_dynamic( world, &world->scene_no_collide, sm );
 310       }
 311    }
 312
 313    /* unpack prop models */
 314    for( u32 i=0; i<mdl_arrcount( &world->ent_prop ); i++ ){
 315       ent_prop *prop = mdl_arritm( &world->ent_prop, i );
 316
 317       for( u32 j=0; j<prop->submesh_count; j ++ ){
 318          mdl_submesh *sm = mdl_arritm( &world->meta.submeshs,
 319                                        prop->submesh_start+j );
 320          world_unpack_submesh_dynamic( world, &world->scene_no_collide, sm );
 321       }
 322    }
 323
 324    vg_async_dispatch( call, async_scene_upload );
 325 }
 326
 327 /* signed distance function for cone */
 328 static f32 fsd_cone_infinite( v3f p, v2f c ){
 329    v2f q = { v2_length( (v2f){ p[0], p[2] } ), -p[1] };
 330    float s = vg_maxf( 0.0f, v2_dot( q, c ) );
 331
 332    v2f v0;
 333    v2_muls( c, s, v0 );
 334    v2_sub( q, v0, v0 );
 335
 336    float d = v2_length( v0 );
 337    return d * ((q[0]*c[1]-q[1]*c[0]<0.0f)?-1.0f:1.0f);
 338 }
 339
 340 struct light_indices_upload_info{
 341    world_instance *world;
 342    v3i count;
 343
 344    void *data;
 345 };
 346
 347 /*
 348  * Async reciever to buffer light index data
 349  */
 350 static void async_upload_light_indices( void *payload, u32 size ){
 351    struct light_indices_upload_info *info = payload;
 352
 353    glGenTextures( 1, &info->world->tex_light_cubes );
 354    glBindTexture( GL_TEXTURE_3D, info->world->tex_light_cubes );
 355    glTexImage3D( GL_TEXTURE_3D, 0, GL_RG32UI,
 356                  info->count[0], info->count[1], info->count[2],
 357                  0, GL_RG_INTEGER, GL_UNSIGNED_INT, info->data );
 358    glTexParameteri( GL_TEXTURE_3D, GL_TEXTURE_MIN_FILTER, GL_NEAREST );
 359    glTexParameteri( GL_TEXTURE_3D, GL_TEXTURE_MAG_FILTER, GL_NEAREST );
 360 }
 361
 362 /*
 363  * Computes light indices for world
 364  */
 365 static void world_gen_compute_light_indices( world_instance *world ){
 366    /* light cubes */
 367    v3f cubes_min, cubes_max;
 368    v3_muls( world->scene_geo.bbx[0], 1.0f/k_world_light_cube_size, cubes_min );
 369    v3_muls( world->scene_geo.bbx[1], 1.0f/k_world_light_cube_size, cubes_max );
 370
 371    v3_sub( cubes_min, (v3f){ 0.5f, 0.5f, 0.5f }, cubes_min );
 372    v3_add( cubes_max, (v3f){ 0.5f, 0.5f, 0.5f }, cubes_max );
 373
 374    v3_floor( cubes_min, cubes_min );
 375    v3_floor( cubes_max, cubes_max );
 376
 377    v3i icubes_min, icubes_max;
 378
 379    for( int i=0; i<3; i++ ){
 380       icubes_min[i] = cubes_min[i];
 381       icubes_max[i] = cubes_max[i];
 382    }
 383
 384    v3f cube_size;
 385
 386    v3i icubes_count;
 387    v3i_sub( icubes_max, icubes_min, icubes_count );
 388
 389    for( int i=0; i<3; i++ ){
 390       int clamped_count = VG_MIN( 128, icubes_count[i]+1 );
 391       float clamped_max = icubes_min[i] + clamped_count,
 392                     max = icubes_min[i] + icubes_count[i]+1;
 393
 394       icubes_count[i] = clamped_count;
 395       cube_size[i] = (max / clamped_max) * k_world_light_cube_size;
 396       cubes_max[i] = clamped_max;
 397    }
 398
 399    v3_mul( cubes_min, cube_size, cubes_min );
 400    v3_mul( cubes_max, cube_size, cubes_max );
 401
 402    for( int i=0; i<3; i++ ){
 403       float range = cubes_max[i]-cubes_min[i];
 404       world->ub_lighting.g_cube_inv_range[i] = 1.0f / range;
 405       world->ub_lighting.g_cube_inv_range[i] *= (float)icubes_count[i];
 406
 407       vg_info( "cubes[%d]: %d\n", i, icubes_count[i] );
 408    }
 409
 410    int total_cubes = icubes_count[0]*icubes_count[1]*icubes_count[2];
 411
 412    u32 data_size = vg_align8(total_cubes*sizeof(u32)*2),
 413        hdr_size  = vg_align8(sizeof(struct light_indices_upload_info));
 414
 415    vg_async_item *call = vg_async_alloc( data_size + hdr_size );
 416    struct light_indices_upload_info *info = call->payload;
 417    info->data = ((u8*)call->payload) + hdr_size;
 418    info->world = world;
 419    u32 *cubes_index = info->data;
 420
 421    for( int i=0; i<3; i++ )
 422       info->count[i] = icubes_count[i];
 423
 424    vg_info( "Computing light cubes (%d) [%f %f %f] -> [%f %f %f]\n",
 425              total_cubes, cubes_min[0], -cubes_min[2], cubes_min[1],
 426                           cubes_max[0], -cubes_max[2], cubes_max[1] );
 427    v3_copy( cubes_min, world->ub_lighting.g_cube_min );
 428
 429    float bound_radius = v3_length( cube_size );
 430
 431    for( int iz = 0; iz<icubes_count[2]; iz ++ ){
 432       for( int iy = 0; iy<icubes_count[1]; iy++ ){
 433          for( int ix = 0; ix<icubes_count[0]; ix++ ){
 434             boxf bbx;
 435             v3_div( (v3f){ ix, iy, iz }, world->ub_lighting.g_cube_inv_range,
 436                   bbx[0] );
 437             v3_div( (v3f){ ix+1, iy+1, iz+1 },
 438                   world->ub_lighting.g_cube_inv_range,
 439                   bbx[1] );
 440
 441             v3_add( bbx[0], world->ub_lighting.g_cube_min, bbx[0] );
 442             v3_add( bbx[1], world->ub_lighting.g_cube_min, bbx[1] );
 443
 444             v3f center;
 445             v3_add( bbx[0], bbx[1], center );
 446             v3_muls( center, 0.5f, center );
 447
 448             u32 indices[6] = { 0, 0, 0, 0, 0, 0 };
 449             u32 count = 0;
 450
 451             float influences[6] = { 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f };
 452             const int N = vg_list_size( influences );
 453
 454             for( u32 j=0; j<mdl_arrcount(&world->ent_light); j ++ ){
 455                ent_light *light = mdl_arritm( &world->ent_light, j );
 456                v3f closest;
 457                closest_point_aabb( light->transform.co, bbx, closest );
 458
 459                f32 dist2 = v3_dist2( closest, light->transform.co );
 460
 461                if( dist2 > light->range*light->range )
 462                   continue;
 463
 464                f32 dist = sqrtf(dist2),
 465                    influence = 1.0f/(dist+1.0f);
 466
 467                if( light->type == k_light_type_spot){
 468                   v3f local;
 469                   m4x3_mulv( light->inverse_world, center, local );
 470
 471                   float r = fsd_cone_infinite( local, light->angle_sin_cos );
 472
 473                   if( r > bound_radius )
 474                      continue;
 475                }
 476
 477                int best_pos = N;
 478                for( int k=best_pos-1; k>=0; k -- )
 479                   if( influence > influences[k] )
 480                      best_pos = k;
 481
 482                if( best_pos < N ){
 483                   for( int k=N-1; k>best_pos; k -- ){
 484                      influences[k] = influences[k-1];
 485                      indices[k] = indices[k-1];
 486                   }
 487
 488                   influences[best_pos] = influence;
 489                   indices[best_pos] = j;
 490                }
 491             }
 492
 493             for( int j=0; j<N; j++ )
 494                if( influences[j] > 0.0f )
 495                   count ++;
 496
 497             int base_index = iz * (icubes_count[0]*icubes_count[1]) +
 498                              iy * (icubes_count[0]) +
 499                              ix;
 500
 501             int lower_count = VG_MIN( 3, count );
 502             u32 packed_index_lower = lower_count;
 503             packed_index_lower |= indices[0]<<2;
 504             packed_index_lower |= indices[1]<<12;
 505             packed_index_lower |= indices[2]<<22;
 506
 507             int upper_count = VG_MAX( 0, count - lower_count );
 508             u32 packed_index_upper = upper_count;
 509             packed_index_upper |= indices[3]<<2;
 510             packed_index_upper |= indices[4]<<12;
 511             packed_index_upper |= indices[5]<<22;
 512
 513             cubes_index[ base_index*2 + 0 ] = packed_index_lower;
 514             cubes_index[ base_index*2 + 1 ] = packed_index_upper;
 515          }
 516       }
 517    }
 518
 519    vg_async_dispatch( call, async_upload_light_indices );
 520 }
 521
 522 /*
 523  * Rendering pass needed to complete the world
 524  */
 525 static void async_world_postprocess( void *payload, u32 _size ){
 526    /* create scene lighting buffer */
 527    world_instance *world = payload;
 528
 529    u32 size = VG_MAX(mdl_arrcount(&world->ent_light),1) * sizeof(float)*12;
 530    vg_info( "Upload %ubytes (lighting)\n", size );
 531
 532    glGenBuffers( 1, &world->tbo_light_entities );
 533    glBindBuffer( GL_TEXTURE_BUFFER, world->tbo_light_entities );
 534    glBufferData( GL_TEXTURE_BUFFER, size, NULL, GL_DYNAMIC_DRAW );
 535
 536    /* buffer layout
 537     *
 538     *  colour               position                direction (spots)
 539     * | .   .   .   .     | .   .   .   .         | .   .   .   .  |
 540     * | Re  Ge  Be  Night | Xco Yco Zco Range     | Dx  Dy  Dz  Da |
 541     *
 542     */
 543
 544    v4f *light_dst = glMapBuffer( GL_TEXTURE_BUFFER, GL_WRITE_ONLY );
 545    for( u32 i=0; i<mdl_arrcount(&world->ent_light); i++ ){
 546       ent_light *light = mdl_arritm( &world->ent_light, i );
 547
 548       /* colour  + night */
 549       v3_muls( light->colour, light->colour[3] * 2.0f, light_dst[i*3+0] );
 550       light_dst[i*3+0][3] = 2.0f;
 551
 552       if( !light->daytime ){
 553          u32 hash = (i * 29986577u) & 0xffu;
 554          float switch_on = hash;
 555                switch_on *= (1.0f/255.0f);
 556
 557          light_dst[i*3+0][3] = 0.44f + switch_on * 0.015f;
 558       }
 559
 560       /* position + 1/range^2 */
 561       v3_copy( light->transform.co, light_dst[i*3+1] );
 562       light_dst[i*3+1][3] = 1.0f/(light->range*light->range);
 563
 564       /* direction + angle */
 565       q_mulv( light->transform.q, (v3f){0.0f,-1.0f,0.0f}, light_dst[i*3+2]);
 566       light_dst[i*3+2][3] = cosf( light->angle );
 567    }
 568
 569    glUnmapBuffer( GL_TEXTURE_BUFFER );
 570
 571    glGenTextures( 1, &world->tex_light_entities );
 572    glBindTexture( GL_TEXTURE_BUFFER, world->tex_light_entities );
 573    glTexBuffer( GL_TEXTURE_BUFFER, GL_RGBA32F, world->tbo_light_entities );
 574
 575    /* Upload lighting uniform buffer */
 576    if( world->water.enabled )
 577       v4_copy( world->water.plane, world->ub_lighting.g_water_plane );
 578
 579    v4f info_vec;
 580    v3f *bounds = world->scene_geo.bbx;
 581
 582    info_vec[0] = bounds[0][0];
 583    info_vec[1] = bounds[0][2];
 584    info_vec[2] = 1.0f/ (bounds[1][0]-bounds[0][0]);
 585    info_vec[3] = 1.0f/ (bounds[1][2]-bounds[0][2]);
 586    v4_copy( info_vec, world->ub_lighting.g_depth_bounds );
 587
 588    /*
 589     * Rendering the depth map
 590     */
 591    camera ortho;
 592
 593    v3f extent;
 594    v3_sub( world->scene_geo.bbx[1], world->scene_geo.bbx[0], extent );
 595
 596    float fl = world->scene_geo.bbx[0][0],
 597          fr = world->scene_geo.bbx[1][0],
 598          fb = world->scene_geo.bbx[0][2],
 599          ft = world->scene_geo.bbx[1][2],
 600          rl = 1.0f / (fr-fl),
 601          tb = 1.0f / (ft-fb);
 602
 603    m4x4_zero( ortho.mtx.p );
 604    ortho.mtx.p[0][0] = 2.0f * rl;
 605    ortho.mtx.p[2][1] = 2.0f * tb;
 606    ortho.mtx.p[3][0] = (fr + fl) * -rl;
 607    ortho.mtx.p[3][1] = (ft + fb) * -tb;
 608    ortho.mtx.p[3][3] = 1.0f;
 609    m4x3_identity( ortho.transform );
 610    camera_update_view( &ortho );
 611    camera_finalize( &ortho );
 612
 613    glDisable(GL_DEPTH_TEST);
 614    glDisable(GL_BLEND);
 615    glDisable(GL_CULL_FACE);
 616    render_fb_bind( &world->heightmap, 0 );
 617    shader_blitcolour_use();
 618    shader_blitcolour_uColour( (v4f){-9999.0f,-9999.0f,-9999.0f,-9999.0f} );
 619    render_fsquad();
 620
 621    glEnable(GL_BLEND);
 622    glBlendFunc(GL_ONE, GL_ONE);
 623    glBlendEquation(GL_MAX);
 624
 625    render_world_position( world, &ortho );
 626    glDisable(GL_BLEND);
 627    glEnable(GL_DEPTH_TEST);
 628    glBindFramebuffer( GL_FRAMEBUFFER, 0 );
 629
 630    /* upload full buffer */
 631    glBindBuffer( GL_UNIFORM_BUFFER, world->ubo_lighting );
 632    glBufferSubData( GL_UNIFORM_BUFFER, 0,
 633                     sizeof(struct ub_world_lighting), &world->ub_lighting );
 634
 635    /*
 636     * Allocate cubemaps
 637     */
 638    for( u32 i=0; i<mdl_arrcount(&world->ent_cubemap); i++ ){
 639       ent_cubemap *cm = mdl_arritm(&world->ent_cubemap,i);
 640
 641       glGenTextures( 1, &cm->texture_id );
 642       glBindTexture( GL_TEXTURE_CUBE_MAP, cm->texture_id );
 643       glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 644                 glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 645                 glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 646                 glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 647                 glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
 648
 649                 for( u32 j=0; j<6; j ++ ) {
 650                         glTexImage2D( GL_TEXTURE_CUBE_MAP_POSITIVE_X + j, 0, GL_RGB,
 651                         WORLD_CUBEMAP_RES, WORLD_CUBEMAP_RES,
 652                         0, GL_RGB, GL_UNSIGNED_BYTE, NULL );
 653                 }
 654
 655                 glGenFramebuffers( 1, &cm->framebuffer_id );
 656                 glBindFramebuffer( GL_FRAMEBUFFER, cm->framebuffer_id );
 657                 glGenRenderbuffers(1, &cm->renderbuffer_id );
 658                 glBindRenderbuffer( GL_RENDERBUFFER, cm->renderbuffer_id );
 659                 glRenderbufferStorage( GL_RENDERBUFFER, GL_DEPTH_COMPONENT24,
 660                               WORLD_CUBEMAP_RES, WORLD_CUBEMAP_RES );
 661
 662                 glFramebufferTexture2D( GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
 663                         GL_TEXTURE_CUBE_MAP_POSITIVE_X, cm->texture_id, 0 );
 664                 glFramebufferRenderbuffer( GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT,
 665                                  GL_RENDERBUFFER, cm->renderbuffer_id );
 666
 667                 glFramebufferTexture2D( GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
 668          GL_TEXTURE_CUBE_MAP_POSITIVE_X, cm->texture_id, 0 );
 669
 670                 if( glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE ){
 671          vg_error( "Cubemap framebuffer incomplete.\n" );
 672       }
 673    }
 674
 675    glBindFramebuffer( GL_FRAMEBUFFER, 0 );
 676 }
 677
 678 /* Loads textures from the pack file */
 679 static void world_gen_load_surfaces( world_instance *world ){
 680    vg_info( "Loading textures\n" );
 681    world->texture_count = 0;
 682
 683    world->texture_count = world->meta.textures.count+1;
 684    world->textures = vg_linear_alloc( world->heap,
 685                               vg_align8(sizeof(GLuint)*world->texture_count) );
 686
 687    vg_tex2d_replace_with_error( &world->textures[0] );
 688
 689    for( u32 i=0; i<mdl_arrcount(&world->meta.textures); i++ ){
 690       mdl_texture *tex = mdl_arritm( &world->meta.textures, i );
 691
 692       if( !tex->file.pack_size ){
 693          vg_fatal_error( "World models must have packed textures!" );
 694       }
 695
 696       vg_linear_clear( vg_mem.scratch );
 697       void *src_data = vg_linear_alloc( vg_mem.scratch,
 698                                         tex->file.pack_size );
 699       mdl_fread_pack_file( &world->meta, &tex->file, src_data );
 700
 701       vg_tex2d_load_qoi_async( src_data, tex->file.pack_size,
 702                                VG_TEX2D_NEAREST|VG_TEX2D_REPEAT,
 703                                &world->textures[i+1] );
 704    }
 705
 706    vg_info( "Loading materials\n" );
 707
 708    world->surface_count = world->meta.materials.count+1;
 709    world->surfaces = vg_linear_alloc( world->heap,
 710                vg_align8(sizeof(struct world_surface)*world->surface_count) );
 711
 712    /* error material */
 713    struct world_surface *errmat = &world->surfaces[0];
 714    memset( errmat, 0, sizeof(struct world_surface) );
 715
 716    for( u32 i=0; i<mdl_arrcount(&world->meta.materials); i++ ){
 717       world->surfaces[i+1].info =
 718          *(mdl_material *)mdl_arritm( &world->meta.materials, i );
 719    }
 720 }
 721
 722 #endif /* WORLD_GEN_C */