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 #include "world.h"
   8 #include "world_gen.h"
   9 #include "world_load.h"
  10 #include "world_volumes.h"
  11 #include "world_gate.h"
  12
  13 /*
  14  * Add all triangles from the model, which match the material ID
  15  * applies affine transform to the model
  16  */
  17 static void world_add_all_if_material( m4x3f transform, scene_context *scene,
  18                                           mdl_context *mdl, u32 id )
  19 {
  20    for( u32 i=0; i<mdl_arrcount(&mdl->meshs); i++ ){
  21       mdl_mesh *mesh = mdl_arritm( &mdl->meshs, i );
  22
  23       for( u32 j=0; j<mesh->submesh_count; j++ ){
  24          mdl_submesh *sm = mdl_arritm( &mdl->submeshs, mesh->submesh_start+j );
  25          if( sm->material_id == id ){
  26             m4x3f transform2;
  27             mdl_transform_m4x3( &mesh->transform, transform2 );
  28             m4x3_mul( transform, transform2, transform2 );
  29
  30             scene_add_mdl_submesh( scene, mdl, sm, transform2 );
  31          }
  32       }
  33    }
  34 }
  35
  36 /*
  37  * Adds a small blob shape to the world at a raycast location. This is for the
  38  * grass sprites
  39  *
  40  *   /''''\
  41  *  /      \
  42  * |        |
  43  * |________|
  44  */
  45 static void world_gen_add_blob( vg_rand *rand, world_instance *world,
  46                                    scene_context *scene, ray_hit *hit )
  47 {
  48    m4x3f transform;
  49    v4f qsurface, qrandom;
  50    v3f axis;
  51
  52    v3_cross( (v3f){0.0f,1.0f,0.0f}, hit->normal, axis );
  53
  54    float angle = v3_dot(hit->normal,(v3f){0.0f,1.0f,0.0f});
  55    q_axis_angle( qsurface, axis, angle );
  56    q_axis_angle( qrandom, (v3f){0.0f,1.0f,0.0f}, vg_randf64(rand)*VG_TAUf );
  57    q_mul( qsurface, qrandom, qsurface );
  58    q_m3x3( qsurface, transform );
  59    v3_copy( hit->pos, transform[3] );
  60
  61    scene_vert verts[] =
  62    {
  63       { .co = { -1.00f, 0.0f, 0.0f } },
  64       { .co = {  1.00f, 0.0f, 0.0f } },
  65       { .co = { -1.00f, 1.2f, 0.0f } },
  66       { .co = {  1.00f, 1.2f, 0.0f } },
  67       { .co = { -0.25f, 2.0f, 0.0f } },
  68       { .co = {  0.25f, 2.0f, 0.0f } }
  69    };
  70
  71    const u32 indices[] = { 0,1,3, 0,3,2, 2,3,5, 2,5,4 };
  72
  73    if( scene->vertex_count + vg_list_size(verts) > scene->max_vertices )
  74       vg_fatal_error( "Scene vertex buffer overflow" );
  75
  76    if( scene->indice_count + vg_list_size(indices) > scene->max_indices )
  77       vg_fatal_error( "Scene index buffer overflow" );
  78
  79    scene_vert *dst_verts = &scene->arrvertices[ scene->vertex_count ];
  80    u32 *dst_indices      = &scene->arrindices [ scene->indice_count ];
  81
  82    scene_vert *ref       = &world->scene_geo.arrvertices[ hit->tri[0] ];
  83
  84    for( u32 i=0; i<vg_list_size(verts); i++ ){
  85       scene_vert *pvert = &dst_verts[ i ],
  86                  *src   = &verts[ i ];
  87
  88       m4x3_mulv( transform, src->co, pvert->co );
  89       scene_vert_pack_norm( pvert, transform[1], 0.0f );
  90
  91       v2_copy( ref->uv, pvert->uv );
  92    }
  93
  94    for( u32 i=0; i<vg_list_size(indices); i++ )
  95       dst_indices[i] = indices[i] + scene->vertex_count;
  96
  97    scene->vertex_count += vg_list_size(verts);
  98    scene->indice_count += vg_list_size(indices);
  99 }
 100
 101 /*
 102  * Sprinkle foliage models over the map on terrain material
 103  */
 104 static void world_apply_procedural_foliage( world_instance *world,
 105                                                scene_context *scene,
 106                                                struct world_surface *mat )
 107 {
 108    if( (vg.quality_profile == k_quality_profile_low) ||
 109        (vg.quality_profile == k_quality_profile_min) )
 110       return;
 111
 112    vg_info( "Applying foliage (%u)\n", mat->info.pstr_name );
 113
 114    v3f volume;
 115    v3_sub( world->scene_geo.bbx[1], world->scene_geo.bbx[0], volume );
 116    volume[1] = 1.0f;
 117
 118    int count = 0;
 119
 120    float area = volume[0]*volume[2];
 121    u32 particles = 0.08f * area;
 122
 123    vg_info( "Map area: %f. Max particles: %u\n", area, particles );
 124
 125    u64 t0 = SDL_GetPerformanceCounter();
 126 #if 0
 127    for( u32 i=0; i<particles; i++ ){
 128       v3f pos;
 129       v3_mul( volume, (v3f){ vg_randf64(), 1000.0f, vg_randf64() }, pos );
 130       pos[1] = 1000.0f;
 131       v3_add( pos, world->scene_geo.bbx[0], pos );
 132
 133       ray_hit hit;
 134       hit.dist = INFINITY;
 135
 136       if( ray_world( world, pos, (v3f){0.0f,-1.0f,0.0f}, &hit,
 137                      k_material_flag_ghosts )){
 138          struct world_surface *m1 = ray_hit_surface( world, &hit );
 139          if((hit.normal[1] > 0.8f) && (m1 == mat) && (hit.pos[1] > 0.0f+10.0f)){
 140             world_gen_add_blob( world, scene, &hit );
 141             count ++;
 142          }
 143       }
 144    }
 145 #else
 146
 147    vg_rand rand;
 148    vg_rand_seed( &rand, 3030 );
 149
 150    const f32 tile_scale = 16.0f;
 151    v2i tiles = { volume[0]/tile_scale, volume[2]/tile_scale };
 152
 153    u32 per_tile = particles/(tiles[0]*tiles[1]);
 154
 155    for( i32 x=0; x<tiles[0]; x ++ ){
 156       for( i32 z=0; z<tiles[1]; z ++ ){
 157          for( u32 i=0; i<per_tile; i ++ ){
 158             v3f co = { (f32)x+vg_randf64(&rand), 0, (f32)z+vg_randf64(&rand) };
 159             v3_muls( co, tile_scale, co );
 160             co[1] = 1000.0f;
 161             v3_add( co, world->scene_geo.bbx[0], co );
 162
 163             ray_hit hit;
 164             hit.dist = INFINITY;
 165
 166             if( ray_world( world, co, (v3f){0.0f,-1.0f,0.0f}, &hit,
 167                            k_material_flag_ghosts )){
 168                struct world_surface *m1 = ray_hit_surface( world, &hit );
 169                if((hit.normal[1] > 0.8f) && (m1 == mat) &&
 170                   (hit.pos[1] > 0.0f+10.0f)){
 171                   world_gen_add_blob( &rand, world, scene, &hit );
 172                   count ++;
 173                }
 174             }
 175
 176          }
 177       }
 178    }
 179
 180 #endif
 181
 182
 183
 184    u64 t1 = SDL_GetPerformanceCounter(),
 185        utime_blobs = t1-t0,
 186        ufreq = SDL_GetPerformanceFrequency();
 187    f64 ftime_blobs = ((f64)utime_blobs / (f64)ufreq)*1000.0;
 188
 189    vg_info( "%d foliage models added. %f%% (%fms)\n", count,
 190             100.0*((f64)count/(f64)particles), ftime_blobs);
 191 }
 192
 193 static
 194 void world_unpack_submesh_dynamic( world_instance *world,
 195                                    scene_context *scene, mdl_submesh *sm ){
 196    if( sm->flags & k_submesh_flag_consumed ) return;
 197
 198    m4x3f identity;
 199    m4x3_identity( identity );
 200    scene_add_mdl_submesh( scene, &world->meta, sm, identity );
 201
 202    scene_copy_slice( scene, sm );
 203    sm->flags |= k_submesh_flag_consumed;
 204 }
 205
 206 /*
 207  * Create the main meshes for the world
 208  */
 209 void world_gen_generate_meshes( world_instance *world )
 210 {
 211    /*
 212     * Compile meshes into the world scenes
 213     */
 214    scene_init( &world->scene_geo, 320000, 1200000 );
 215    u32 buf_size = scene_mem_required( &world->scene_geo );
 216    u8 *buffer = vg_linear_alloc( world->heap, buf_size );
 217    scene_supply_buffer( &world->scene_geo, buffer );
 218
 219    m4x3f midentity;
 220    m4x3_identity( midentity );
 221
 222    /*
 223     * Generate scene: collidable geometry
 224     * ----------------------------------------------------------------
 225     */
 226
 227    vg_info( "Generating collidable geometry\n" );
 228
 229    for( u32 i=0; i<world->surface_count; i++ ){
 230       struct world_surface *surf = &world->surfaces[ i ];
 231
 232       if( surf->info.flags & k_material_flag_collision )
 233          world_add_all_if_material( midentity, &world->scene_geo,
 234                                     &world->meta, i );
 235
 236       scene_copy_slice( &world->scene_geo, &surf->sm_geo );
 237       scene_set_vertex_flags( &world->scene_geo,
 238                               surf->sm_geo.vertex_start,
 239                               surf->sm_geo.vertex_count,
 240                               (u16)(surf->info.flags & 0xffff) );
 241    }
 242
 243    /* compress that bad boy */
 244    u32 new_vert_max = world->scene_geo.vertex_count,
 245        new_vert_size = vg_align8(new_vert_max*sizeof(scene_vert)),
 246        new_indice_len = world->scene_geo.indice_count*sizeof(u32);
 247
 248    u32 *src_indices = world->scene_geo.arrindices,
 249        *dst_indices = (u32 *)(buffer + new_vert_size);
 250
 251    memmove( dst_indices, src_indices, new_indice_len );
 252
 253    world->scene_geo.max_indices = world->scene_geo.indice_count;
 254    world->scene_geo.max_vertices = world->scene_geo.vertex_count;
 255    buf_size = scene_mem_required( &world->scene_geo );
 256
 257    buffer = vg_linear_resize( world->heap, buffer, buf_size );
 258
 259    world->scene_geo.arrvertices = (scene_vert *)(buffer);
 260    world->scene_geo.arrindices = (u32 *)(buffer + new_vert_size);
 261
 262    scene_upload_async( &world->scene_geo, &world->mesh_geo );
 263
 264    /* need send off the memory to the gpu before we can create the bvh. */
 265    vg_async_stall();
 266    vg_info( "creating bvh\n" );
 267    world->geo_bh = scene_bh_create( world->heap, &world->scene_geo );
 268
 269    /*
 270     * Generate scene: non-collidable geometry
 271     * ----------------------------------------------------------------
 272     */
 273    vg_info( "Generating non-collidable geometry\n" );
 274
 275    vg_async_item *call = scene_alloc_async( &world->scene_no_collide,
 276                                             &world->mesh_no_collide,
 277                                             250000, 500000 );
 278
 279    for( u32 i=0; i<world->surface_count; i++ ){
 280       struct world_surface *surf = &world->surfaces[ i ];
 281
 282       if( !(surf->info.flags & k_material_flag_collision) ){
 283          world_add_all_if_material( midentity,
 284                                     &world->scene_no_collide, &world->meta, i );
 285       }
 286
 287       if( surf->info.flags & k_material_flag_grow_grass ){
 288          world_apply_procedural_foliage( world, &world->scene_no_collide,
 289                                          surf );
 290       }
 291
 292       scene_copy_slice( &world->scene_no_collide, &surf->sm_no_collide );
 293    }
 294
 295    /* unpack traffic models.. TODO: should we just put all these submeshes in a
 296     * dynamic models list? and then the actual entitities point to the
 297     * models. we only have 2 types at the moment which need dynamic models but
 298     * would make sense to do this when/if we have more.
 299     */
 300    for( u32 i=0; i<mdl_arrcount( &world->ent_traffic ); i++ ){
 301       ent_traffic *vehc = mdl_arritm( &world->ent_traffic, i );
 302
 303       for( u32 j=0; j<vehc->submesh_count; j++ ){
 304          mdl_submesh *sm = mdl_arritm( &world->meta.submeshs,
 305                                        vehc->submesh_start+j );
 306          world_unpack_submesh_dynamic( world, &world->scene_no_collide, sm );
 307          world->surfaces[ sm->material_id ].flags |= WORLD_SURFACE_HAS_TRAFFIC;
 308       }
 309    }
 310
 311    /* unpack challenge models */
 312    for( u32 i=0; i<mdl_arrcount( &world->ent_objective ); i++ ){
 313       ent_objective *objective = mdl_arritm( &world->ent_objective, i );
 314
 315       for( u32 j=0; j<objective->submesh_count; j ++ ){
 316          mdl_submesh *sm = mdl_arritm( &world->meta.submeshs,
 317                                        objective->submesh_start+j );
 318          world_unpack_submesh_dynamic( world, &world->scene_no_collide, sm );
 319       }
 320    }
 321
 322    /* unpack region models */
 323    for( u32 i=0; i<mdl_arrcount( &world->ent_region ); i++ ){
 324       ent_region *region = mdl_arritm( &world->ent_region, i );
 325
 326       for( u32 j=0; j<region->submesh_count; j ++ ){
 327          mdl_submesh *sm = mdl_arritm( &world->meta.submeshs,
 328                                        region->submesh_start+j );
 329          world_unpack_submesh_dynamic( world, &world->scene_no_collide, sm );
 330       }
 331    }
 332
 333    /* unpack gate models */
 334    for( u32 i=0; i<mdl_arrcount( &world->ent_gate ); i++ ){
 335       ent_gate *gate = mdl_arritm( &world->ent_gate, i );
 336
 337       if( !(gate->flags & k_ent_gate_custom_mesh) ) continue;
 338
 339       for( u32 j=0; j<gate->submesh_count; j ++ ){
 340          mdl_submesh *sm = mdl_arritm( &world->meta.submeshs,
 341                                        gate->submesh_start+j );
 342          world_unpack_submesh_dynamic( world, &world->scene_no_collide, sm );
 343       }
 344    }
 345
 346    /* unpack prop models */
 347    for( u32 i=0; i<mdl_arrcount( &world->ent_prop ); i++ ){
 348       ent_prop *prop = mdl_arritm( &world->ent_prop, i );
 349
 350       for( u32 j=0; j<prop->submesh_count; j ++ ){
 351          mdl_submesh *sm = mdl_arritm( &world->meta.submeshs,
 352                                        prop->submesh_start+j );
 353          world->surfaces[ sm->material_id ].flags |= WORLD_SURFACE_HAS_PROPS;
 354          world_unpack_submesh_dynamic( world, &world->scene_no_collide, sm );
 355       }
 356    }
 357
 358    vg_async_dispatch( call, async_scene_upload );
 359 }
 360
 361 /* signed distance function for cone */
 362 static f32 fsd_cone_infinite( v3f p, v2f c ){
 363    v2f q = { v2_length( (v2f){ p[0], p[2] } ), -p[1] };
 364    float s = vg_maxf( 0.0f, v2_dot( q, c ) );
 365
 366    v2f v0;
 367    v2_muls( c, s, v0 );
 368    v2_sub( q, v0, v0 );
 369
 370    float d = v2_length( v0 );
 371    return d * ((q[0]*c[1]-q[1]*c[0]<0.0f)?-1.0f:1.0f);
 372 }
 373
 374 struct light_indices_upload_info{
 375    world_instance *world;
 376    v3i count;
 377
 378    void *data;
 379 };
 380
 381 /*
 382  * Async reciever to buffer light index data
 383  */
 384 static void async_upload_light_indices( void *payload, u32 size ){
 385    struct light_indices_upload_info *info = payload;
 386
 387    glGenTextures( 1, &info->world->tex_light_cubes );
 388    glBindTexture( GL_TEXTURE_3D, info->world->tex_light_cubes );
 389    glTexImage3D( GL_TEXTURE_3D, 0, GL_RG32UI,
 390                  info->count[0], info->count[1], info->count[2],
 391                  0, GL_RG_INTEGER, GL_UNSIGNED_INT, info->data );
 392    glTexParameteri( GL_TEXTURE_3D, GL_TEXTURE_MIN_FILTER, GL_NEAREST );
 393    glTexParameteri( GL_TEXTURE_3D, GL_TEXTURE_MAG_FILTER, GL_NEAREST );
 394 }
 395
 396 /*
 397  * Computes light indices for world
 398  */
 399 void world_gen_compute_light_indices( world_instance *world )
 400 {
 401    /* light cubes */
 402    v3f cubes_min, cubes_max;
 403    v3_muls( world->scene_geo.bbx[0], 1.0f/k_world_light_cube_size, cubes_min );
 404    v3_muls( world->scene_geo.bbx[1], 1.0f/k_world_light_cube_size, cubes_max );
 405
 406    v3_sub( cubes_min, (v3f){ 0.5f, 0.5f, 0.5f }, cubes_min );
 407    v3_add( cubes_max, (v3f){ 0.5f, 0.5f, 0.5f }, cubes_max );
 408
 409    v3_floor( cubes_min, cubes_min );
 410    v3_floor( cubes_max, cubes_max );
 411
 412    v3i icubes_min, icubes_max;
 413
 414    for( int i=0; i<3; i++ ){
 415       icubes_min[i] = cubes_min[i];
 416       icubes_max[i] = cubes_max[i];
 417    }
 418
 419    v3f cube_size;
 420
 421    v3i icubes_count;
 422    v3i_sub( icubes_max, icubes_min, icubes_count );
 423
 424    for( int i=0; i<3; i++ ){
 425       int clamped_count = VG_MIN( 128, icubes_count[i]+1 );
 426       float clamped_max = icubes_min[i] + clamped_count,
 427                     max = icubes_min[i] + icubes_count[i]+1;
 428
 429       icubes_count[i] = clamped_count;
 430       cube_size[i] = (max / clamped_max) * k_world_light_cube_size;
 431       cubes_max[i] = clamped_max;
 432    }
 433
 434    v3_mul( cubes_min, cube_size, cubes_min );
 435    v3_mul( cubes_max, cube_size, cubes_max );
 436
 437    for( int i=0; i<3; i++ ){
 438       float range = cubes_max[i]-cubes_min[i];
 439       world->ub_lighting.g_cube_inv_range[i] = 1.0f / range;
 440       world->ub_lighting.g_cube_inv_range[i] *= (float)icubes_count[i];
 441
 442       vg_info( "cubes[%d]: %d\n", i, icubes_count[i] );
 443    }
 444
 445    int total_cubes = icubes_count[0]*icubes_count[1]*icubes_count[2];
 446
 447    u32 data_size = vg_align8(total_cubes*sizeof(u32)*2),
 448        hdr_size  = vg_align8(sizeof(struct light_indices_upload_info));
 449
 450    vg_async_item *call = vg_async_alloc( data_size + hdr_size );
 451    struct light_indices_upload_info *info = call->payload;
 452    info->data = ((u8*)call->payload) + hdr_size;
 453    info->world = world;
 454    u32 *cubes_index = info->data;
 455
 456    for( int i=0; i<3; i++ )
 457       info->count[i] = icubes_count[i];
 458
 459    vg_info( "Computing light cubes (%d) [%f %f %f] -> [%f %f %f]\n",
 460              total_cubes, cubes_min[0], -cubes_min[2], cubes_min[1],
 461                           cubes_max[0], -cubes_max[2], cubes_max[1] );
 462    v3_copy( cubes_min, world->ub_lighting.g_cube_min );
 463
 464    float bound_radius = v3_length( cube_size );
 465
 466    for( int iz = 0; iz<icubes_count[2]; iz ++ ){
 467       for( int iy = 0; iy<icubes_count[1]; iy++ ){
 468          for( int ix = 0; ix<icubes_count[0]; ix++ ){
 469             boxf bbx;
 470             v3_div( (v3f){ ix, iy, iz }, world->ub_lighting.g_cube_inv_range,
 471                   bbx[0] );
 472             v3_div( (v3f){ ix+1, iy+1, iz+1 },
 473                   world->ub_lighting.g_cube_inv_range,
 474                   bbx[1] );
 475
 476             v3_add( bbx[0], world->ub_lighting.g_cube_min, bbx[0] );
 477             v3_add( bbx[1], world->ub_lighting.g_cube_min, bbx[1] );
 478
 479             v3f center;
 480             v3_add( bbx[0], bbx[1], center );
 481             v3_muls( center, 0.5f, center );
 482
 483             u32 indices[6] = { 0, 0, 0, 0, 0, 0 };
 484             u32 count = 0;
 485
 486             float influences[6] = { 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f };
 487             const int N = vg_list_size( influences );
 488
 489             for( u32 j=0; j<mdl_arrcount(&world->ent_light); j ++ ){
 490                ent_light *light = mdl_arritm( &world->ent_light, j );
 491                v3f closest;
 492                closest_point_aabb( light->transform.co, bbx, closest );
 493
 494                f32 dist2 = v3_dist2( closest, light->transform.co );
 495
 496                if( dist2 > light->range*light->range )
 497                   continue;
 498
 499                f32 dist = sqrtf(dist2),
 500                    influence = 1.0f/(dist+1.0f);
 501
 502                if( light->type == k_light_type_spot){
 503                   v3f local;
 504                   m4x3_mulv( light->inverse_world, center, local );
 505
 506                   float r = fsd_cone_infinite( local, light->angle_sin_cos );
 507
 508                   if( r > bound_radius )
 509                      continue;
 510                }
 511
 512                int best_pos = N;
 513                for( int k=best_pos-1; k>=0; k -- )
 514                   if( influence > influences[k] )
 515                      best_pos = k;
 516
 517                if( best_pos < N ){
 518                   for( int k=N-1; k>best_pos; k -- ){
 519                      influences[k] = influences[k-1];
 520                      indices[k] = indices[k-1];
 521                   }
 522
 523                   influences[best_pos] = influence;
 524                   indices[best_pos] = j;
 525                }
 526             }
 527
 528             for( int j=0; j<N; j++ )
 529                if( influences[j] > 0.0f )
 530                   count ++;
 531
 532             int base_index = iz * (icubes_count[0]*icubes_count[1]) +
 533                              iy * (icubes_count[0]) +
 534                              ix;
 535
 536             int lower_count = VG_MIN( 3, count );
 537             u32 packed_index_lower = lower_count;
 538             packed_index_lower |= indices[0]<<2;
 539             packed_index_lower |= indices[1]<<12;
 540             packed_index_lower |= indices[2]<<22;
 541
 542             int upper_count = VG_MAX( 0, count - lower_count );
 543             u32 packed_index_upper = upper_count;
 544             packed_index_upper |= indices[3]<<2;
 545             packed_index_upper |= indices[4]<<12;
 546             packed_index_upper |= indices[5]<<22;
 547
 548             cubes_index[ base_index*2 + 0 ] = packed_index_lower;
 549             cubes_index[ base_index*2 + 1 ] = packed_index_upper;
 550          }
 551       }
 552    }
 553
 554    vg_async_dispatch( call, async_upload_light_indices );
 555 }
 556
 557 /*
 558  * Rendering pass needed to complete the world
 559  */
 560 void async_world_postprocess( void *payload, u32 _size )
 561 {
 562    /* create scene lighting buffer */
 563    world_instance *world = payload;
 564
 565    u32 size = VG_MAX(mdl_arrcount(&world->ent_light),1) * sizeof(float)*12;
 566    vg_info( "Upload %ubytes (lighting)\n", size );
 567
 568    glGenBuffers( 1, &world->tbo_light_entities );
 569    glBindBuffer( GL_TEXTURE_BUFFER, world->tbo_light_entities );
 570    glBufferData( GL_TEXTURE_BUFFER, size, NULL, GL_DYNAMIC_DRAW );
 571
 572    /* buffer layout
 573     *
 574     *  colour               position                direction (spots)
 575     * | .   .   .   .     | .   .   .   .         | .   .   .   .  |
 576     * | Re  Ge  Be  Night | Xco Yco Zco Range     | Dx  Dy  Dz  Da |
 577     *
 578     */
 579
 580    v4f *light_dst = glMapBuffer( GL_TEXTURE_BUFFER, GL_WRITE_ONLY );
 581    for( u32 i=0; i<mdl_arrcount(&world->ent_light); i++ ){
 582       ent_light *light = mdl_arritm( &world->ent_light, i );
 583
 584       /* colour  + night */
 585       v3_muls( light->colour, light->colour[3] * 2.0f, light_dst[i*3+0] );
 586       light_dst[i*3+0][3] = 2.0f;
 587
 588       if( !light->daytime ){
 589          u32 hash = (i * 29986577u) & 0xffu;
 590          float switch_on = hash;
 591                switch_on *= (1.0f/255.0f);
 592
 593          light_dst[i*3+0][3] = 0.44f + switch_on * 0.015f;
 594       }
 595
 596       /* position + 1/range^2 */
 597       v3_copy( light->transform.co, light_dst[i*3+1] );
 598       light_dst[i*3+1][3] = 1.0f/(light->range*light->range);
 599
 600       /* direction + angle */
 601       q_mulv( light->transform.q, (v3f){0.0f,-1.0f,0.0f}, light_dst[i*3+2]);
 602       light_dst[i*3+2][3] = cosf( light->angle );
 603    }
 604
 605    glUnmapBuffer( GL_TEXTURE_BUFFER );
 606
 607    glGenTextures( 1, &world->tex_light_entities );
 608    glBindTexture( GL_TEXTURE_BUFFER, world->tex_light_entities );
 609    glTexBuffer( GL_TEXTURE_BUFFER, GL_RGBA32F, world->tbo_light_entities );
 610
 611    /* Upload lighting uniform buffer */
 612    if( world->water.enabled )
 613       v4_copy( world->water.plane, world->ub_lighting.g_water_plane );
 614
 615    v4f info_vec;
 616    v3f *bounds = world->scene_geo.bbx;
 617
 618    info_vec[0] = bounds[0][0];
 619    info_vec[1] = bounds[0][2];
 620    info_vec[2] = 1.0f/ (bounds[1][0]-bounds[0][0]);
 621    info_vec[3] = 1.0f/ (bounds[1][2]-bounds[0][2]);
 622    v4_copy( info_vec, world->ub_lighting.g_depth_bounds );
 623
 624    /*
 625     * Rendering the depth map
 626     */
 627    vg_camera ortho;
 628
 629    v3f extent;
 630    v3_sub( world->scene_geo.bbx[1], world->scene_geo.bbx[0], extent );
 631
 632    float fl = world->scene_geo.bbx[0][0],
 633          fr = world->scene_geo.bbx[1][0],
 634          fb = world->scene_geo.bbx[0][2],
 635          ft = world->scene_geo.bbx[1][2],
 636          rl = 1.0f / (fr-fl),
 637          tb = 1.0f / (ft-fb);
 638
 639    m4x4_zero( ortho.mtx.p );
 640    ortho.mtx.p[0][0] = 2.0f * rl;
 641    ortho.mtx.p[2][1] = 2.0f * tb;
 642    ortho.mtx.p[3][0] = (fr + fl) * -rl;
 643    ortho.mtx.p[3][1] = (ft + fb) * -tb;
 644    ortho.mtx.p[3][3] = 1.0f;
 645    m4x3_identity( ortho.transform );
 646    vg_camera_update_view( &ortho );
 647    vg_camera_finalize( &ortho );
 648
 649    glDisable(GL_DEPTH_TEST);
 650    glDisable(GL_BLEND);
 651    glDisable(GL_CULL_FACE);
 652    render_fb_bind( &world->heightmap, 0 );
 653    shader_blitcolour_use();
 654    shader_blitcolour_uColour( (v4f){-9999.0f,-9999.0f,-9999.0f,-9999.0f} );
 655    render_fsquad();
 656
 657    glEnable(GL_BLEND);
 658    glBlendFunc(GL_ONE, GL_ONE);
 659    glBlendEquation(GL_MAX);
 660
 661    render_world_position( world, &ortho );
 662    glDisable(GL_BLEND);
 663    glEnable(GL_DEPTH_TEST);
 664    glBindFramebuffer( GL_FRAMEBUFFER, 0 );
 665
 666    /* upload full buffer */
 667    glBindBuffer( GL_UNIFORM_BUFFER, world->ubo_lighting );
 668    glBufferSubData( GL_UNIFORM_BUFFER, 0,
 669                     sizeof(struct ub_world_lighting), &world->ub_lighting );
 670
 671    /*
 672     * Allocate cubemaps
 673     */
 674    for( u32 i=0; i<mdl_arrcount(&world->ent_cubemap); i++ ){
 675       ent_cubemap *cm = mdl_arritm(&world->ent_cubemap,i);
 676
 677       glGenTextures( 1, &cm->texture_id );
 678       glBindTexture( GL_TEXTURE_CUBE_MAP, cm->texture_id );
 679       glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 680                 glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 681                 glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 682                 glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 683                 glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
 684
 685                 for( u32 j=0; j<6; j ++ ) {
 686                         glTexImage2D( GL_TEXTURE_CUBE_MAP_POSITIVE_X + j, 0, GL_RGB,
 687                         WORLD_CUBEMAP_RES, WORLD_CUBEMAP_RES,
 688                         0, GL_RGB, GL_UNSIGNED_BYTE, NULL );
 689                 }
 690
 691                 glGenFramebuffers( 1, &cm->framebuffer_id );
 692                 glBindFramebuffer( GL_FRAMEBUFFER, cm->framebuffer_id );
 693                 glGenRenderbuffers(1, &cm->renderbuffer_id );
 694                 glBindRenderbuffer( GL_RENDERBUFFER, cm->renderbuffer_id );
 695                 glRenderbufferStorage( GL_RENDERBUFFER, GL_DEPTH_COMPONENT24,
 696                               WORLD_CUBEMAP_RES, WORLD_CUBEMAP_RES );
 697
 698                 glFramebufferTexture2D( GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
 699                         GL_TEXTURE_CUBE_MAP_POSITIVE_X, cm->texture_id, 0 );
 700                 glFramebufferRenderbuffer( GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT,
 701                                  GL_RENDERBUFFER, cm->renderbuffer_id );
 702
 703                 glFramebufferTexture2D( GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
 704          GL_TEXTURE_CUBE_MAP_POSITIVE_X, cm->texture_id, 0 );
 705
 706                 if( glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE ){
 707          vg_error( "Cubemap framebuffer incomplete.\n" );
 708       }
 709    }
 710
 711    glBindFramebuffer( GL_FRAMEBUFFER, 0 );
 712 }
 713
 714 /* Loads textures from the pack file */
 715 void world_gen_load_surfaces( world_instance *world )
 716 {
 717    vg_info( "Loading textures\n" );
 718    world->texture_count = 0;
 719
 720    world->texture_count = world->meta.textures.count+1;
 721    world->textures = vg_linear_alloc( world->heap,
 722                               vg_align8(sizeof(GLuint)*world->texture_count) );
 723    world->textures[0] = vg.tex_missing;
 724
 725    for( u32 i=0; i<mdl_arrcount(&world->meta.textures); i++ ){
 726       mdl_texture *tex = mdl_arritm( &world->meta.textures, i );
 727
 728       if( !tex->file.pack_size ){
 729          vg_fatal_error( "World models must have packed textures!" );
 730       }
 731
 732       vg_linear_clear( vg_mem.scratch );
 733       void *src_data = vg_linear_alloc( vg_mem.scratch,
 734                                         tex->file.pack_size );
 735       mdl_fread_pack_file( &world->meta, &tex->file, src_data );
 736
 737       vg_tex2d_load_qoi_async( src_data, tex->file.pack_size,
 738                                VG_TEX2D_NEAREST|VG_TEX2D_REPEAT,
 739                                &world->textures[i+1] );
 740    }
 741
 742    vg_info( "Loading materials\n" );
 743
 744    world->surface_count = world->meta.materials.count+1;
 745    world->surfaces = vg_linear_alloc( world->heap,
 746                vg_align8(sizeof(struct world_surface)*world->surface_count) );
 747
 748    /* error material */
 749    struct world_surface *errmat = &world->surfaces[0];
 750    memset( errmat, 0, sizeof(struct world_surface) );
 751
 752    for( u32 i=0; i<mdl_arrcount(&world->meta.materials); i++ ){
 753       struct world_surface *surf = &world->surfaces[i+1];
 754       surf->info = *(mdl_material *)mdl_arritm( &world->meta.materials, i );
 755       surf->flags = 0;
 756    }
 757 }