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 VG_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 VG_STATIC void world_gen_generate_meshes(void)
 168 {
 169    /*
 170     * Compile meshes into the world scenes
 171     */
 172    world_instance *world = world_loading_instance();
 173    scene_init( &world->scene_geo, 320000, 1200000 );
 174    u32 buf_size = scene_mem_required( &world->scene_geo );
 175    u8 *buffer = vg_linear_alloc( world->heap, buf_size );
 176    scene_supply_buffer( &world->scene_geo, buffer );
 177
 178    m4x3f midentity;
 179    m4x3_identity( midentity );
 180
 181    /*
 182     * Generate scene: collidable geometry
 183     * ----------------------------------------------------------------
 184     */
 185
 186    vg_info( "Generating collidable geometry\n" );
 187
 188    for( u32 i=0; i<world->surface_count; i++ ){
 189       struct world_surface *surf = &world->surfaces[ i ];
 190
 191       if( surf->info.flags & k_material_flag_collision )
 192          world_add_all_if_material( midentity, &world->scene_geo,
 193                                     &world->meta, i );
 194
 195       scene_copy_slice( &world->scene_geo, &surf->sm_geo );
 196    }
 197
 198    /* compress that bad boy */
 199    u32 new_vert_max = world->scene_geo.vertex_count,
 200        new_vert_size = vg_align8(new_vert_max*sizeof(scene_vert)),
 201        new_indice_len = world->scene_geo.indice_count*sizeof(u32);
 202
 203    u32 *src_indices = world->scene_geo.arrindices,
 204        *dst_indices = (u32 *)(buffer + new_vert_size);
 205
 206    memmove( dst_indices, src_indices, new_indice_len );
 207
 208    world->scene_geo.max_indices = world->scene_geo.indice_count;
 209    world->scene_geo.max_vertices = world->scene_geo.vertex_count;
 210    buf_size = scene_mem_required( &world->scene_geo );
 211
 212    buffer = vg_linear_resize( world->heap, buffer, buf_size );
 213
 214    world->scene_geo.arrvertices = (scene_vert *)(buffer);
 215    world->scene_geo.arrindices = (u32 *)(buffer + new_vert_size);
 216
 217    scene_upload_async( &world->scene_geo, &world->mesh_geo );
 218
 219    /* need send off the memory to the gpu before we can create the bvh. */
 220    vg_async_stall();
 221    vg_info( "creating bvh\n" );
 222
 223    /* setup spacial mapping and rigidbody */
 224    world->geo_bh = scene_bh_create( world->heap, &world->scene_geo );
 225
 226    v3_zero( world->rb_geo.rb.co );
 227    v3_zero( world->rb_geo.rb.v );
 228    q_identity( world->rb_geo.rb.q );
 229    v3_zero( world->rb_geo.rb.w );
 230
 231    world->rb_geo.type = k_rb_shape_scene;
 232    world->rb_geo.inf.scene.bh_scene = world->geo_bh;
 233    rb_init_object( &world->rb_geo );
 234
 235    /*
 236     * Generate scene: non-collidable geometry
 237     * ----------------------------------------------------------------
 238     */
 239    vg_info( "Generating non-collidable geometry\n" );
 240
 241    vg_async_item *call = scene_alloc_async( &world->scene_no_collide,
 242                                             &world->mesh_no_collide,
 243                                             250000, 500000 );
 244
 245    for( u32 i=0; i<world->surface_count; i++ ){
 246       struct world_surface *surf = &world->surfaces[ i ];
 247
 248       if( !(surf->info.flags & k_material_flag_collision) ){
 249          world_add_all_if_material( midentity,
 250                                     &world->scene_no_collide, &world->meta, i );
 251       }
 252
 253       if( surf->info.flags & k_material_flag_grow_grass )
 254          world_apply_procedural_foliage( &world->scene_no_collide, surf );
 255
 256       scene_copy_slice( &world->scene_no_collide, &surf->sm_no_collide );
 257    }
 258
 259    /* unpack traffic models.. TODO: should we just put all these submeshes in a
 260     * dynamic models list? and then the actual entitities point to the
 261     * models. we only have 2 types at the moment which need dynamic models but
 262     * would make sense to do this when/if we have more.
 263     */
 264    for( u32 i=0; i<mdl_arrcount( &world->ent_traffic ); i++ ){
 265       ent_traffic *vehc = mdl_arritm( &world->ent_traffic, i );
 266
 267       for( u32 j=0; j<vehc->submesh_count; j++ ){
 268          mdl_submesh *sm = mdl_arritm( &world->meta.submeshs,
 269                                        vehc->submesh_start+j );
 270          world_unpack_submesh_dynamic( world, &world->scene_no_collide, sm );
 271       }
 272    }
 273
 274    /* unpack challenge models */
 275    for( u32 i=0; i<mdl_arrcount( &world->ent_challenge ); i++ ){
 276       ent_challenge *challenge = mdl_arritm( &world->ent_challenge, i );
 277
 278       for( u32 j=0; j<challenge->submesh_count; j ++ ){
 279          mdl_submesh *sm = mdl_arritm( &world->meta.submeshs,
 280                                        challenge->submesh_start+j );
 281          world_unpack_submesh_dynamic( world, &world->scene_no_collide, sm );
 282       }
 283    }
 284
 285    /* unpack gate models */
 286    for( u32 i=0; i<mdl_arrcount( &world->ent_gate ); i++ ){
 287       ent_gate *gate = mdl_arritm( &world->ent_gate, i );
 288
 289       if( !(gate->flags & k_ent_gate_custom_mesh) ) continue;
 290
 291       for( u32 j=0; j<gate->submesh_count; j ++ ){
 292          mdl_submesh *sm = mdl_arritm( &world->meta.submeshs,
 293                                        gate->submesh_start+j );
 294          world_unpack_submesh_dynamic( world, &world->scene_no_collide, sm );
 295       }
 296    }
 297
 298    vg_async_dispatch( call, async_scene_upload );
 299 }
 300
 301 /* signed distance function for cone */
 302 static f32 fsd_cone_infinite( v3f p, v2f c )
 303 {
 304    v2f q = { v2_length( (v2f){ p[0], p[2] } ), -p[1] };
 305    float s = vg_maxf( 0.0f, v2_dot( q, c ) );
 306
 307    v2f v0;
 308    v2_muls( c, s, v0 );
 309    v2_sub( q, v0, v0 );
 310
 311    float d = v2_length( v0 );
 312    return d * ((q[0]*c[1]-q[1]*c[0]<0.0f)?-1.0f:1.0f);
 313 }
 314
 315 struct light_indices_upload_info{
 316    world_instance *world;
 317    v3i count;
 318
 319    void *data;
 320 };
 321
 322 /*
 323  * Async reciever to buffer light index data
 324  */
 325 VG_STATIC void async_upload_light_indices( void *payload, u32 size )
 326 {
 327    struct light_indices_upload_info *info = payload;
 328
 329    glGenTextures( 1, &info->world->tex_light_cubes );
 330    glBindTexture( GL_TEXTURE_3D, info->world->tex_light_cubes );
 331    glTexImage3D( GL_TEXTURE_3D, 0, GL_RG32UI,
 332                  info->count[0], info->count[1], info->count[2],
 333                  0, GL_RG_INTEGER, GL_UNSIGNED_INT, info->data );
 334    glTexParameteri( GL_TEXTURE_3D, GL_TEXTURE_MIN_FILTER, GL_NEAREST );
 335    glTexParameteri( GL_TEXTURE_3D, GL_TEXTURE_MAG_FILTER, GL_NEAREST );
 336 }
 337
 338 /*
 339  * Computes light indices for world
 340  */
 341 VG_STATIC void world_gen_compute_light_indices(void)
 342 {
 343    /* light cubes */
 344    world_instance *world = world_loading_instance();
 345    v3f cubes_min, cubes_max;
 346    v3_muls( world->scene_geo.bbx[0], 1.0f/k_world_light_cube_size, cubes_min );
 347    v3_muls( world->scene_geo.bbx[1], 1.0f/k_world_light_cube_size, cubes_max );
 348
 349    v3_sub( cubes_min, (v3f){ 0.5f, 0.5f, 0.5f }, cubes_min );
 350    v3_add( cubes_max, (v3f){ 0.5f, 0.5f, 0.5f }, cubes_max );
 351
 352    v3_floor( cubes_min, cubes_min );
 353    v3_floor( cubes_max, cubes_max );
 354
 355    v3i icubes_min, icubes_max;
 356
 357    for( int i=0; i<3; i++ ){
 358       icubes_min[i] = cubes_min[i];
 359       icubes_max[i] = cubes_max[i];
 360    }
 361
 362    v3f cube_size;
 363
 364    v3i icubes_count;
 365    v3i_sub( icubes_max, icubes_min, icubes_count );
 366
 367    for( int i=0; i<3; i++ ){
 368       int clamped_count = VG_MIN( 128, icubes_count[i]+1 );
 369       float clamped_max = icubes_min[i] + clamped_count,
 370                     max = icubes_min[i] + icubes_count[i]+1;
 371
 372       icubes_count[i] = clamped_count;
 373       cube_size[i] = (max / clamped_max) * k_world_light_cube_size;
 374       cubes_max[i] = clamped_max;
 375    }
 376
 377    v3_mul( cubes_min, cube_size, cubes_min );
 378    v3_mul( cubes_max, cube_size, cubes_max );
 379
 380    for( int i=0; i<3; i++ ){
 381       float range = cubes_max[i]-cubes_min[i];
 382       world->ub_lighting.g_cube_inv_range[i] = 1.0f / range;
 383       world->ub_lighting.g_cube_inv_range[i] *= (float)icubes_count[i];
 384
 385       vg_info( "cubes[%d]: %d\n", i, icubes_count[i] );
 386    }
 387
 388    int total_cubes = icubes_count[0]*icubes_count[1]*icubes_count[2];
 389
 390    u32 data_size = vg_align8(total_cubes*sizeof(u32)*2),
 391        hdr_size  = vg_align8(sizeof(struct light_indices_upload_info));
 392
 393    vg_async_item *call = vg_async_alloc( data_size + hdr_size );
 394    struct light_indices_upload_info *info = call->payload;
 395    info->data = ((u8*)call->payload) + hdr_size;
 396    info->world = world;
 397    u32 *cubes_index = info->data;
 398
 399    for( int i=0; i<3; i++ )
 400       info->count[i] = icubes_count[i];
 401
 402    vg_info( "Computing light cubes (%d) [%f %f %f] -> [%f %f %f]\n",
 403              total_cubes, cubes_min[0], -cubes_min[2], cubes_min[1],
 404                           cubes_max[0], -cubes_max[2], cubes_max[1] );
 405    v3_copy( cubes_min, world->ub_lighting.g_cube_min );
 406
 407    float bound_radius = v3_length( cube_size );
 408
 409    for( int iz = 0; iz<icubes_count[2]; iz ++ ){
 410       for( int iy = 0; iy<icubes_count[1]; iy++ ){
 411          for( int ix = 0; ix<icubes_count[0]; ix++ ){
 412             boxf bbx;
 413             v3_div( (v3f){ ix, iy, iz }, world->ub_lighting.g_cube_inv_range,
 414                   bbx[0] );
 415             v3_div( (v3f){ ix+1, iy+1, iz+1 },
 416                   world->ub_lighting.g_cube_inv_range,
 417                   bbx[1] );
 418
 419             v3_add( bbx[0], world->ub_lighting.g_cube_min, bbx[0] );
 420             v3_add( bbx[1], world->ub_lighting.g_cube_min, bbx[1] );
 421
 422             v3f center;
 423             v3_add( bbx[0], bbx[1], center );
 424             v3_muls( center, 0.5f, center );
 425
 426             u32 indices[6] = { 0, 0, 0, 0, 0, 0 };
 427             u32 count = 0;
 428
 429             float influences[6] = { 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f };
 430             const int N = vg_list_size( influences );
 431
 432             for( u32 j=0; j<mdl_arrcount(&world->ent_light); j ++ ){
 433                ent_light *light = mdl_arritm( &world->ent_light, j );
 434                v3f closest;
 435                closest_point_aabb( light->transform.co, bbx, closest );
 436
 437                float dist = v3_dist( closest, light->transform.co ),
 438                      influence = 1.0f/(dist+1.0f);
 439
 440                if( dist > light->range )
 441                   continue;
 442
 443                if( light->type == k_light_type_spot){
 444                   v3f local;
 445                   m4x3_mulv( light->inverse_world, center, local );
 446
 447                   float r = fsd_cone_infinite( local, light->angle_sin_cos );
 448
 449                   if( r > bound_radius )
 450                      continue;
 451                }
 452
 453                int best_pos = N;
 454                for( int k=best_pos-1; k>=0; k -- )
 455                   if( influence > influences[k] )
 456                      best_pos = k;
 457
 458                if( best_pos < N ){
 459                   for( int k=N-1; k>best_pos; k -- ){
 460                      influences[k] = influences[k-1];
 461                      indices[k] = indices[k-1];
 462                   }
 463
 464                   influences[best_pos] = influence;
 465                   indices[best_pos] = j;
 466                }
 467             }
 468
 469             for( int j=0; j<N; j++ )
 470                if( influences[j] > 0.0f )
 471                   count ++;
 472
 473             int base_index = iz * (icubes_count[0]*icubes_count[1]) +
 474                              iy * (icubes_count[0]) +
 475                              ix;
 476
 477             int lower_count = VG_MIN( 3, count );
 478             u32 packed_index_lower = lower_count;
 479             packed_index_lower |= indices[0]<<2;
 480             packed_index_lower |= indices[1]<<12;
 481             packed_index_lower |= indices[2]<<22;
 482
 483             int upper_count = VG_MAX( 0, count - lower_count );
 484             u32 packed_index_upper = upper_count;
 485             packed_index_upper |= indices[3]<<2;
 486             packed_index_upper |= indices[4]<<12;
 487             packed_index_upper |= indices[5]<<22;
 488
 489             cubes_index[ base_index*2 + 0 ] = packed_index_lower;
 490             cubes_index[ base_index*2 + 1 ] = packed_index_upper;
 491          }
 492       }
 493    }
 494
 495    vg_async_dispatch( call, async_upload_light_indices );
 496 }
 497
 498 /*
 499  * Rendering pass needed to complete the world
 500  */
 501 VG_STATIC void async_world_postprocess_render( void *payload, u32 _size )
 502 {
 503    /* create scene lighting buffer */
 504    world_instance *world = world_loading_instance();
 505
 506    u32 size = VG_MAX(mdl_arrcount(&world->ent_light),1) * sizeof(float)*12;
 507    vg_info( "Upload %ubytes (lighting)\n", size );
 508
 509    glGenBuffers( 1, &world->tbo_light_entities );
 510    glBindBuffer( GL_TEXTURE_BUFFER, world->tbo_light_entities );
 511    glBufferData( GL_TEXTURE_BUFFER, size, NULL, GL_DYNAMIC_DRAW );
 512
 513    /* buffer layout
 514     *
 515     *  colour               position                direction (spots)
 516     * | .   .   .   .     | .   .   .   .         | .   .   .   .  |
 517     * | Re  Ge  Be  Night | Xco Yco Zco Range     | Dx  Dy  Dz  Da |
 518     *
 519     */
 520
 521    v4f *light_dst = glMapBuffer( GL_TEXTURE_BUFFER, GL_WRITE_ONLY );
 522    for( u32 i=0; i<mdl_arrcount(&world->ent_light); i++ ){
 523       ent_light *light = mdl_arritm( &world->ent_light, i );
 524
 525       /* colour  + night */
 526       v3_muls( light->colour, light->colour[3] * 2.0f, light_dst[i*3+0] );
 527       light_dst[i*3+0][3] = 2.0f;
 528
 529       if( !light->daytime ){
 530          u32 hash = (i * 29986577u) & 0xffu;
 531          float switch_on = hash;
 532                switch_on *= (1.0f/255.0f);
 533
 534          light_dst[i*3+0][3] = 0.44f + switch_on * 0.015f;
 535       }
 536
 537       /* position + 1/range^2 */
 538       v3_copy( light->transform.co, light_dst[i*3+1] );
 539       light_dst[i*3+1][3] = 1.0f/(light->range*light->range);
 540
 541       /* direction + angle */
 542       q_mulv( light->transform.q, (v3f){0.0f,-1.0f,0.0f}, light_dst[i*3+2]);
 543       light_dst[i*3+2][3] = cosf( light->angle );
 544    }
 545
 546    glUnmapBuffer( GL_TEXTURE_BUFFER );
 547
 548    glGenTextures( 1, &world->tex_light_entities );
 549    glBindTexture( GL_TEXTURE_BUFFER, world->tex_light_entities );
 550    glTexBuffer( GL_TEXTURE_BUFFER, GL_RGBA32F, world->tbo_light_entities );
 551
 552    /* Upload lighting uniform buffer */
 553    if( world->water.enabled )
 554       v4_copy( world->water.plane, world->ub_lighting.g_water_plane );
 555
 556    v4f info_vec;
 557    v3f *bounds = world->scene_geo.bbx;
 558
 559    info_vec[0] = bounds[0][0];
 560    info_vec[1] = bounds[0][2];
 561    info_vec[2] = 1.0f/ (bounds[1][0]-bounds[0][0]);
 562    info_vec[3] = 1.0f/ (bounds[1][2]-bounds[0][2]);
 563    v4_copy( info_vec, world->ub_lighting.g_depth_bounds );
 564
 565    /*
 566     * Rendering the depth map
 567     */
 568    camera ortho;
 569
 570    v3f extent;
 571    v3_sub( world->scene_geo.bbx[1], world->scene_geo.bbx[0], extent );
 572
 573    float fl = world->scene_geo.bbx[0][0],
 574          fr = world->scene_geo.bbx[1][0],
 575          fb = world->scene_geo.bbx[0][2],
 576          ft = world->scene_geo.bbx[1][2],
 577          rl = 1.0f / (fr-fl),
 578          tb = 1.0f / (ft-fb);
 579
 580    m4x4_zero( ortho.mtx.p );
 581    ortho.mtx.p[0][0] = 2.0f * rl;
 582    ortho.mtx.p[2][1] = 2.0f * tb;
 583    ortho.mtx.p[3][0] = (fr + fl) * -rl;
 584    ortho.mtx.p[3][1] = (ft + fb) * -tb;
 585    ortho.mtx.p[3][3] = 1.0f;
 586    m4x3_identity( ortho.transform );
 587    camera_update_view( &ortho );
 588    camera_finalize( &ortho );
 589
 590    glDisable(GL_DEPTH_TEST);
 591    glDisable(GL_BLEND);
 592    glDisable(GL_CULL_FACE);
 593    render_fb_bind( &world->heightmap, 0 );
 594    shader_blitcolour_use();
 595    shader_blitcolour_uColour( (v4f){-9999.0f,-9999.0f,-9999.0f,-9999.0f} );
 596    render_fsquad();
 597
 598    glEnable(GL_BLEND);
 599    glBlendFunc(GL_ONE, GL_ONE);
 600    glBlendEquation(GL_MAX);
 601
 602    render_world_position( world, &ortho );
 603    glDisable(GL_BLEND);
 604    glEnable(GL_DEPTH_TEST);
 605    glBindFramebuffer( GL_FRAMEBUFFER, 0 );
 606
 607    /* upload full buffer */
 608    glBindBuffer( GL_UNIFORM_BUFFER, world->ubo_lighting );
 609    glBufferSubData( GL_UNIFORM_BUFFER, 0,
 610                     sizeof(struct ub_world_lighting), &world->ub_lighting );
 611
 612    /* yes we are using this as the entity begin thing. FIXME */
 613    world->probabilities[ k_probability_curve_constant ] = 1.0f;
 614    for( u32 i=0; i<mdl_arrcount(&world->ent_audio); i++ ){
 615       ent_audio *audio = mdl_arritm(&world->ent_audio,i);
 616       if( audio->flags & AUDIO_FLAG_AUTO_START ){
 617          ent_call call;
 618          call.data = NULL;
 619          call.function = k_ent_function_trigger;
 620          call.id = mdl_entity_id( k_ent_audio, i );
 621          entity_call( world, &call );
 622       }
 623    }
 624 }
 625
 626 /* Loads textures from the pack file */
 627 VG_STATIC void world_gen_load_surfaces(void)
 628 {
 629    world_instance *world = world_loading_instance();
 630    vg_info( "Loading textures\n" );
 631    world->texture_count = 0;
 632
 633    world->texture_count = world->meta.textures.count+1;
 634    world->textures = vg_linear_alloc( world->heap,
 635                               vg_align8(sizeof(GLuint)*world->texture_count) );
 636
 637    vg_tex2d_replace_with_error( &world->textures[0] );
 638
 639    for( u32 i=0; i<mdl_arrcount(&world->meta.textures); i++ ){
 640       mdl_texture *tex = mdl_arritm( &world->meta.textures, i );
 641
 642       if( !tex->file.pack_size ){
 643          vg_fatal_error( "World models must have packed textures!" );
 644       }
 645
 646       vg_linear_clear( vg_mem.scratch );
 647       void *src_data = vg_linear_alloc( vg_mem.scratch,
 648                                         tex->file.pack_size );
 649       mdl_fread_pack_file( &world->meta, &tex->file, src_data );
 650
 651       vg_tex2d_load_qoi_async( src_data, tex->file.pack_size,
 652                                VG_TEX2D_NEAREST|VG_TEX2D_REPEAT,
 653                                &world->textures[i+1] );
 654    }
 655
 656    vg_info( "Loading materials\n" );
 657
 658    world->surface_count = world->meta.materials.count+1;
 659    world->surfaces = vg_linear_alloc( world->heap,
 660                vg_align8(sizeof(struct world_surface)*world->surface_count) );
 661
 662    /* error material */
 663    struct world_surface *errmat = &world->surfaces[0];
 664    memset( errmat, 0, sizeof(struct world_surface) );
 665
 666    for( u32 i=0; i<mdl_arrcount(&world->meta.materials); i++ ){
 667       world->surfaces[i+1].info =
 668          *(mdl_material *)mdl_arritm( &world->meta.materials, i );
 669    }
 670 }
 671
 672 #endif /* WORLD_GEN_C */