world.h

   1 /*
   2  * Copyright (C) 2021-2022 Mt.ZERO Software, Harry Godden - All Rights Reserved
   3  */
   4
   5 #include "common.h"
   6
   7 #ifndef WORLD_H
   8 #define WORLD_H
   9
  10 typedef struct world_instance world_instance;
  11
  12 #include "vg/vg_loader.h"
  13
  14 #include "network.h"
  15 #include "network_msg.h"
  16 #include "scene.h"
  17 #include "render.h"
  18 #include "rigidbody.h"
  19 #include "bvh.h"
  20 #include "model.h"
  21 #include "entity.h"
  22 #include "font.h"
  23
  24 #include "shaders/scene_standard.h"
  25 #include "shaders/scene_standard_alphatest.h"
  26 #include "shaders/scene_vertex_blend.h"
  27 #include "shaders/scene_terrain.h"
  28 #include "shaders/scene_depth.h"
  29 #include "shaders/scene_position.h"
  30
  31 #include "shaders/model_sky.h"
  32
  33 enum { k_max_ui_segments = 8 };
  34
  35 enum { k_max_ui_elements = k_max_ui_segments };
  36 enum { k_max_element_verts = 10 };
  37 enum { k_max_element_indices = 20 };
  38
  39 enum { k_route_ui_max_verts = k_max_ui_elements*k_max_element_verts };
  40 enum { k_route_ui_max_indices = k_max_ui_elements*k_max_element_indices };
  41
  42 enum logic_type
  43 {
  44    k_logic_type_relay         = 1,
  45    k_logic_type_chance        = 2,
  46    k_logic_type_achievement   = 3
  47 };
  48
  49 enum geo_type
  50 {
  51    k_geo_type_solid = 0,
  52    k_geo_type_nonsolid = 1,
  53    k_geo_type_water = 2
  54 };
  55
  56 static const float k_light_cube_size = 8.0f;
  57
  58 struct world_instance {
  59    /* Fixed items
  60     * -------------------------------------------------------
  61     */
  62
  63    char  world_name[ 64 ];
  64
  65    struct{
  66       boxf depthbounds;
  67       int depth_computed;
  68
  69       float height;
  70       int enabled;
  71       v4f plane;
  72    }
  73    water;
  74
  75    /* STD140 */
  76    struct ub_world_lighting{
  77       v4f g_cube_min,
  78           g_cube_inv_range;
  79
  80       v4f g_water_plane,
  81           g_depth_bounds;
  82
  83       v4f g_daysky_colour;
  84       v4f g_nightsky_colour;
  85       v4f g_sunset_colour;
  86       v4f g_ambient_colour;
  87       v4f g_sunset_ambient;
  88       v4f g_sun_colour;
  89       v4f g_sun_dir;
  90       v4f g_board_0;
  91       v4f g_board_1;
  92
  93       float g_water_fog;
  94       float g_time;
  95       float g_realtime;
  96       float g_shadow_length;
  97       float g_shadow_spread;
  98
  99       float g_time_of_day;
 100       float g_day_phase;
 101       float g_sunset_phase;
 102
 103       int g_light_preview;
 104       int g_shadow_samples;
 105
 106       int g_debug_indices;
 107       int g_debug_complexity;
 108    }
 109    ub_lighting;
 110    GLuint ubo_lighting;
 111    int    ubo_bind_point;
 112
 113    GLuint tbo_light_entities,
 114           tex_light_entities,
 115           tex_light_cubes;
 116
 117    float probabilities[3];
 118
 119    v3i light_cubes;
 120
 121    struct framebuffer heightmap;
 122
 123    /*
 124     * Dynamically allocated when world_load is called.
 125     *
 126     *                  the following arrays index somewhere into this linear
 127     *                  allocator
 128     *
 129     * (world_gen.h)
 130     * --------------------------------------------------------------------------
 131     */
 132
 133    /*
 134     * Main world .mdl
 135     */
 136    mdl_context meta;
 137
 138    GLuint *textures;
 139    u32 texture_count;
 140
 141    struct world_surface{
 142       mdl_material info;
 143       mdl_submesh sm_geo,
 144                   sm_no_collide;
 145    }
 146    * surfaces;
 147    u32 surface_count;
 148
 149    mdl_array_ptr ent_spawn,
 150                  ent_gate,
 151                  ent_light,
 152                  ent_route_node,
 153                  ent_path_index,
 154                  ent_checkpoint,
 155                  ent_route,
 156                  ent_water,
 157
 158                  ent_audio_clip,
 159                  ent_audio,
 160                  ent_volume;
 161
 162    ent_gate *rendering_gate;
 163
 164    /* logic
 165     * ----------------------------------------------------
 166     */
 167
 168    /* world geometry */
 169    scene *scene_geo,
 170          *scene_no_collide,
 171          *scene_lines;
 172
 173    /* spacial mappings */
 174    bh_tree *audio_bh,
 175            *volume_bh,
 176            *geo_bh;
 177
 178    /* graphics */
 179    glmesh mesh_route_lines;
 180    glmesh mesh_geo,
 181           mesh_no_collide,
 182           mesh_water;
 183
 184    rb_object rb_geo;
 185 };
 186
 187 VG_STATIC struct world_global{
 188    /*
 189     * Allocated as system memory
 190     * --------------------------------------------------------------------------
 191     */
 192    void *generic_heap;
 193
 194    /* rendering */
 195    glmesh skydome;
 196    glmesh mesh_gate;
 197    mdl_submesh sm_gate_surface,
 198                sm_gate_marker[4];
 199
 200    double sky_time, sky_rate, sky_target_rate;
 201
 202    u32 current_run_version;
 203    double time, rewind_from, rewind_to, last_use;
 204
 205    /* water rendering */
 206    struct{
 207       struct framebuffer fbreflect, fbdepth;
 208    }
 209    water;
 210
 211    /* split flap display */
 212    struct{
 213       glmesh mesh_base, mesh_display;
 214       mdl_submesh sm_base;
 215       u32 active_route_board;
 216
 217       u32 w, h;
 218       float *buffer;
 219    }
 220    sfd;
 221
 222    v3f render_gate_pos;
 223    int in_volume;
 224
 225    int switching_to_new_world;
 226
 227    world_instance worlds[4];
 228    u32            world_count;
 229    u32            active_world;
 230
 231    /* text particles */
 232    font3d font;
 233
 234    struct timer_text{
 235       char text[8];
 236       m4x3f transform;
 237       ent_gate *gate;
 238       ent_route *route;
 239    }
 240    timer_texts[4];
 241    u32 timer_text_count;
 242
 243    struct text_particle{
 244       rb_object obj;
 245       m4x3f mlocal;
 246       ent_glyph *glyph;
 247       v4f colour;
 248
 249       m4x3f mdl;
 250    }
 251    text_particles[6*4];
 252    u32 text_particle_count;
 253
 254 }
 255 world_global;
 256
 257 VG_STATIC world_instance *get_active_world( void )
 258 {
 259    return &world_global.worlds[ world_global.active_world ];
 260 }
 261
 262 /*
 263  * API
 264  */
 265
 266 VG_STATIC
 267 int ray_hit_is_ramp( world_instance *world, ray_hit *hit );
 268
 269 VG_STATIC
 270 struct world_surface *ray_hit_surface( world_instance *world, ray_hit *hit );
 271
 272 VG_STATIC
 273 void ray_world_get_tri( world_instance *world, ray_hit *hit, v3f tri[3] );
 274
 275 VG_STATIC
 276 int ray_world( world_instance *world, v3f pos, v3f dir, ray_hit *hit );
 277
 278 VG_STATIC
 279 ent_spawn *world_find_closest_spawn( world_instance *world, v3f position )
 280 {
 281    ent_spawn *rp = NULL, *r;
 282    float min_dist = INFINITY;
 283
 284    for( u32 i=0; i<mdl_arrcount(&world->ent_spawn); i++ ){
 285       r = mdl_arritm( &world->ent_spawn, i );
 286       float d = v3_dist2( r->transform.co, position );
 287
 288       if( d < min_dist ){
 289          min_dist = d;
 290          rp = r;
 291       }
 292    }
 293
 294    if( !rp ){
 295       if( mdl_arrcount(&world->ent_spawn) ){
 296          vg_warn( "Invalid distances to spawns.. defaulting to first one.\n" );
 297          return mdl_arritm( &world->ent_spawn, 0 );
 298       }
 299       else{
 300          vg_error( "There are no spawns in the level!\n" );
 301       }
 302    }
 303
 304    return rp;
 305 }
 306
 307 VG_STATIC
 308 ent_spawn *world_find_spawn_by_name( world_instance *world, const char *name )
 309 {
 310    ent_spawn *rp = NULL, *r;
 311    for( u32 i=0; i<mdl_arrcount(&world->ent_spawn); i++ ){
 312       r = mdl_arritm( &world->ent_spawn, i );
 313       if( !strcmp( mdl_pstr(&world->meta, r->pstr_name), name ) ){
 314          rp = r;
 315          break;
 316       }
 317    }
 318
 319    if( !rp )
 320       vg_warn( "No spawn named '%s'\n", name );
 321
 322    return rp;
 323 }
 324
 325 /*
 326  * Submodules
 327  */
 328
 329 VG_STATIC float
 330    k_day_length            = 30.0f; /* minutes */
 331
 332 VG_STATIC int   k_debug_light_indices = 0,
 333                 k_debug_light_complexity = 0,
 334                 k_light_preview = 0;
 335
 336 #include "world_routes.h"
 337 #include "world_sfd.h"
 338 #include "world_render.h"
 339 #include "world_water.h"
 340 #include "world_volumes.h"
 341 #include "world_gen.h"
 342 #include "world_gate.h"
 343
 344 /*
 345  * -----------------------------------------------------------------------------
 346  *                                    Events
 347  * -----------------------------------------------------------------------------
 348  */
 349
 350 VG_STATIC int world_stop_sound( int argc, const char *argv[] )
 351 {
 352    world_instance *world = get_active_world();
 353    return 0;
 354 }
 355
 356 VG_STATIC void world_init(void)
 357 {
 358    VG_VAR_F32( k_day_length );
 359    VG_VAR_I32( k_debug_light_indices );
 360    VG_VAR_I32( k_debug_light_complexity );
 361    VG_VAR_I32( k_light_preview );
 362
 363    world_global.sky_rate = 1.0;
 364    world_global.sky_target_rate = 1.0;
 365
 366    shader_scene_standard_register();
 367    shader_scene_standard_alphatest_register();
 368    shader_scene_vertex_blend_register();
 369    shader_scene_terrain_register();
 370    shader_scene_depth_register();
 371    shader_scene_position_register();
 372
 373    shader_model_sky_register();
 374
 375    vg_info( "Loading world resources\n" );
 376
 377    vg_linear_clear( vg_mem.scratch );
 378
 379    mdl_context msky;
 380    mdl_open( &msky, "models/rs_skydome.mdl", vg_mem.scratch );
 381    mdl_load_metadata_block( &msky, vg_mem.scratch );
 382    mdl_load_mesh_block( &msky, vg_mem.scratch );
 383    mdl_close( &msky );
 384
 385    vg_acquire_thread_sync();
 386    {
 387       mdl_unpack_glmesh( &msky, &world_global.skydome );
 388    }
 389    vg_release_thread_sync();
 390
 391    /* Other systems */
 392    vg_info( "Loading other world systems\n" );
 393
 394    vg_loader_step( world_render_init, NULL );
 395    vg_loader_step( world_sfd_init, NULL );
 396    vg_loader_step( world_water_init, NULL );
 397    vg_loader_step( world_gates_init, NULL );
 398    vg_loader_step( world_routes_init, NULL );
 399
 400    /* Allocate dynamic world memory arena */
 401    u32 max_size = 76*1024*1024;
 402    world_global.generic_heap = vg_create_linear_allocator( vg_mem.rtmemory,
 403                                                            max_size,
 404                                                            VG_MEMORY_SYSTEM );
 405 }
 406
 407 typedef struct ent_call ent_call;
 408 struct ent_call{
 409    ent_index ent;
 410    u32 function;
 411    void *data;
 412 };
 413
 414 VG_STATIC void entity_call( world_instance *world, ent_call *call );
 415
 416 VG_STATIC void ent_volume_call( world_instance *world, ent_call *call )
 417 {
 418    ent_volume *volume = mdl_arritm( &world->ent_volume, call->ent.index );
 419    if( !volume->target.type ) return;
 420
 421    if( call->function == k_ent_function_trigger ){
 422       call->ent = volume->target;
 423
 424       if( volume->type == k_volume_subtype_particle ){
 425          float *co = alloca( sizeof(float)*3 );
 426          co[0] = vg_randf()*2.0f-1.0f;
 427          co[1] = vg_randf()*2.0f-1.0f;
 428          co[2] = vg_randf()*2.0f-1.0f;
 429          m4x3_mulv( volume->to_world, co, co );
 430
 431          call->function = k_ent_function_particle_spawn;
 432          call->data = co;
 433          entity_call( world, call );
 434       }
 435       else
 436          entity_call( world, call );
 437    }
 438 }
 439
 440 VG_STATIC void ent_audio_call( world_instance *world, ent_call *call )
 441 {
 442    ent_audio *audio = mdl_arritm( &world->ent_audio, call->ent.index );
 443
 444    v3f sound_co;
 445
 446    if( call->function == k_ent_function_particle_spawn ){
 447       v3_copy( call->data, sound_co );
 448    }
 449    else if( call->function == k_ent_function_trigger ){
 450       v3_copy( audio->transform.co, sound_co );
 451    }
 452    else
 453       vg_fatal_exit_loop( "ent_audio_call (invalid function id)" );
 454
 455    float chance = vg_randf()*100.0f,
 456          bar = 0.0f;
 457
 458    for( u32 i=0; i<audio->clip_count; i++ ){
 459       ent_audio_clip *clip = mdl_arritm( &world->ent_audio_clip,
 460                                           audio->clip_start+i );
 461
 462       float mod = world->probabilities[ audio->probability_curve ],
 463             p   = clip->probability * mod;
 464
 465       bar += p;
 466
 467       if( chance < bar ){
 468
 469          audio_lock();
 470
 471          if( audio->behaviour == k_channel_behaviour_unlimited ){
 472             audio_oneshot_3d( &clip->clip, sound_co,
 473                               audio->transform.s[0],
 474                               audio->volume );
 475          }
 476          else if( audio->behaviour == k_channel_behaviour_discard_if_full ){
 477             audio_channel *ch =
 478                audio_get_group_idle_channel( audio->group,
 479                                              audio->max_channels );
 480
 481             if( ch ){
 482                audio_channel_init( ch, &clip->clip, audio->flags );
 483                audio_channel_group( ch, audio->group );
 484                audio_channel_set_spacial( ch, sound_co, audio->transform.s[0] );
 485                audio_channel_edit_volume( ch, audio->volume, 1 );
 486                ch = audio_relinquish_channel( ch );
 487             }
 488          }
 489          else if( audio->behaviour == k_channel_behaviour_crossfade_if_full){
 490             audio_channel *ch =
 491                audio_get_group_idle_channel( audio->group,
 492                                              audio->max_channels );
 493
 494             /* group is full */
 495             if( !ch ){
 496                audio_channel *existing =
 497                   audio_get_group_first_active_channel( audio->group );
 498
 499                if( existing ){
 500                   if( existing->source == &clip->clip ){
 501                      audio_unlock();
 502                      return;
 503                   }
 504
 505                   existing->group = 0;
 506                   existing = audio_channel_fadeout(existing, audio->crossfade);
 507                }
 508
 509                ch = audio_get_first_idle_channel();
 510             }
 511
 512             if( ch ){
 513                audio_channel_init( ch, &clip->clip, audio->flags );
 514                audio_channel_group( ch, audio->group );
 515                audio_channel_fadein( ch, audio->crossfade );
 516                ch = audio_relinquish_channel( ch );
 517             }
 518          }
 519
 520          audio_unlock();
 521          return;
 522       }
 523    }
 524 }
 525
 526 VG_STATIC void entity_call( world_instance *world, ent_call *call )
 527 {
 528    if( call->ent.type == k_ent_volume ){
 529       ent_volume_call( world, call );
 530    } else if( call->ent.type == k_ent_audio ){
 531       ent_audio_call( world, call );
 532    }
 533 }
 534
 535 VG_STATIC void world_update( world_instance *world, v3f pos )
 536 {
 537    world_global.sky_time += world_global.sky_rate * vg.time_delta;
 538    world_global.sky_rate = vg_lerp( world_global.sky_rate,
 539                                     world_global.sky_target_rate,
 540                                     vg.time_delta * 5.0 );
 541
 542    world_routes_update_timer_texts( world );
 543    world_routes_update( world );
 544    //world_routes_debug( world );
 545
 546    /* ---- SFD ------------ */
 547
 548    if( mdl_arrcount( &world->ent_route ) ){
 549       u32 closest = 0;
 550       float min_dist = INFINITY;
 551
 552       for( u32 i=0; i<mdl_arrcount( &world->ent_route ); i++ ){
 553          ent_route *route = mdl_arritm( &world->ent_route, i );
 554          float dist = v3_dist2( route->board_transform[3], pos );
 555
 556          if( dist < min_dist ){
 557             min_dist = dist;
 558             closest = i;
 559          }
 560       }
 561
 562       if( (world_global.sfd.active_route_board != closest)
 563           || network_scores_updated )
 564       {
 565          network_scores_updated = 0;
 566          world_global.sfd.active_route_board = closest;
 567
 568          ent_route *route = mdl_arritm( &world->ent_route, closest );
 569          u32 id = route->official_track_id;
 570
 571          if( id != 0xffffffff ){
 572             struct netmsg_board *local_board =
 573                &scoreboard_client_data.boards[id];
 574
 575             for( int i=0; i<13; i++ ){
 576                sfd_encode( i, &local_board->data[27*i] );
 577             }
 578          }else{
 579             sfd_encode( 0, mdl_pstr( &world->meta, route->pstr_name ) );
 580             sfd_encode( 1, "No data" );
 581          }
 582       }
 583    }
 584    sfd_update();
 585
 586    static float random_accum = 0.0f;
 587    random_accum += vg.time_delta;
 588
 589    u32 random_ticks = 0;
 590
 591    while( random_accum > 0.1f ){
 592       random_accum -= 0.1f;
 593       random_ticks ++;
 594    }
 595
 596    float radius = 25.0f;
 597    boxf volume_proximity;
 598    v3_add( pos, (v3f){ radius, radius, radius }, volume_proximity[1] );
 599    v3_sub( pos, (v3f){ radius, radius, radius }, volume_proximity[0] );
 600
 601    bh_iter it;
 602    bh_iter_init( 0, &it );
 603    int idx;
 604
 605    int in_volume = 0;
 606
 607    while( bh_next( world->volume_bh, &it, volume_proximity, &idx ) ){
 608       ent_volume *volume = mdl_arritm( &world->ent_volume, idx );
 609
 610       boxf cube = {{-1.0f,-1.0f,-1.0f},{1.0f,1.0f,1.0f}};
 611
 612       if( volume->type == k_volume_subtype_trigger ){
 613          v3f local;
 614          m4x3_mulv( volume->to_local, pos, local );
 615
 616          if( (fabsf(local[0]) <= 1.0f) &&
 617              (fabsf(local[1]) <= 1.0f) &&
 618              (fabsf(local[2]) <= 1.0f) )
 619          {
 620             in_volume = 1;
 621             vg_line_boxf_transformed( volume->to_world, cube, 0xff00ff00 );
 622
 623             if( !world_global.in_volume ){
 624                ent_call basecall;
 625                basecall.ent.index = idx;
 626                basecall.ent.type = k_ent_volume;
 627                basecall.function = k_ent_function_trigger;
 628                basecall.data = NULL;
 629
 630                entity_call( world, &basecall );
 631             }
 632          }
 633          else
 634             vg_line_boxf_transformed( volume->to_world, cube, 0xff0000ff );
 635       }
 636       else if( volume->type == k_volume_subtype_particle ){
 637          vg_line_boxf_transformed( volume->to_world, cube, 0xff00c0ff );
 638
 639          for( int j=0; j<random_ticks; j++ ){
 640             ent_call basecall;
 641             basecall.ent.index = idx;
 642             basecall.ent.type = k_ent_volume;
 643             basecall.function = k_ent_function_trigger;
 644             basecall.data = NULL;
 645
 646             entity_call( world, &basecall );
 647          }
 648       }
 649    }
 650    world_global.in_volume = in_volume;
 651
 652 #if 0
 653    if( k_debug_light_indices )
 654    {
 655       for( int i=0; i<world->light_count; i++ ){
 656          struct world_light *light = &world->lights[i];
 657          struct classtype_world_light *inf = light->inf;
 658
 659          u32 colour = 0xff000000;
 660          u8 r = inf->colour[0] * 255.0f,
 661             g = inf->colour[1] * 255.0f,
 662             b = inf->colour[2] * 255.0f;
 663
 664          colour |= r;
 665          colour |= g << 8;
 666          colour |= b << 16;
 667
 668          vg_line_pt3( light->node->co, 0.25f, colour );
 669       }
 670    }
 671
 672 #endif
 673 }
 674
 675 /*
 676  * -----------------------------------------------------------------------------
 677  *                              API implementation
 678  * -----------------------------------------------------------------------------
 679  */
 680
 681 VG_STATIC void ray_world_get_tri( world_instance *world,
 682                                   ray_hit *hit, v3f tri[3] )
 683 {
 684    for( int i=0; i<3; i++ )
 685       v3_copy( world->scene_geo->arrvertices[ hit->tri[i] ].co, tri[i] );
 686 }
 687
 688 VG_STATIC int ray_world( world_instance *world,
 689                          v3f pos, v3f dir, ray_hit *hit )
 690 {
 691    return scene_raycast( world->scene_geo, world->geo_bh, pos, dir, hit );
 692 }
 693
 694 /*
 695  * Cast a sphere from a to b and see what time it hits
 696  */
 697 VG_STATIC int spherecast_world( world_instance *world,
 698                                 v3f pa, v3f pb, float r, float *t, v3f n )
 699 {
 700    bh_iter it;
 701    bh_iter_init( 0, &it );
 702
 703    boxf region;
 704    box_init_inf( region );
 705    box_addpt( region, pa );
 706    box_addpt( region, pb );
 707
 708    v3_add( (v3f){ r, r, r}, region[1], region[1] );
 709    v3_add( (v3f){-r,-r,-r}, region[0], region[0] );
 710
 711    v3f dir;
 712    v3_sub( pb, pa, dir );
 713
 714    v3f dir_inv;
 715    dir_inv[0] = 1.0f/dir[0];
 716    dir_inv[1] = 1.0f/dir[1];
 717    dir_inv[2] = 1.0f/dir[2];
 718
 719    int hit = -1;
 720    float min_t = 1.0f;
 721
 722    int idx;
 723    while( bh_next( world->geo_bh, &it, region, &idx ) ){
 724       u32 *ptri = &world->scene_geo->arrindices[ idx*3 ];
 725       v3f tri[3];
 726
 727       boxf box;
 728       box_init_inf( box );
 729
 730       for( int j=0; j<3; j++ ){
 731          v3_copy( world->scene_geo->arrvertices[ptri[j]].co, tri[j] );
 732          box_addpt( box, tri[j] );
 733       }
 734
 735       v3_add( (v3f){ r, r, r}, box[1], box[1] );
 736       v3_add( (v3f){-r,-r,-r}, box[0], box[0] );
 737
 738       if( !ray_aabb1( box, pa, dir_inv, 1.0f ) )
 739          continue;
 740
 741       float t;
 742       v3f n1;
 743       if( spherecast_triangle( tri, pa, dir, r, &t, n1 ) ){
 744          if( t < min_t ){
 745             min_t = t;
 746             hit = idx;
 747             v3_copy( n1, n );
 748          }
 749       }
 750    }
 751
 752    *t = min_t;
 753    return hit;
 754 }
 755
 756 VG_STATIC
 757 struct world_surface *world_tri_index_surface( world_instance *world,
 758                                                  u32 index )
 759 {
 760    for( int i=1; i<world->surface_count; i++ ){
 761       struct world_surface *surf = &world->surfaces[i];
 762
 763       if( (index >= surf->sm_geo.vertex_start) &&
 764           (index  < surf->sm_geo.vertex_start+surf->sm_geo.vertex_count ) )
 765       {
 766          return surf;
 767       }
 768    }
 769
 770    return &world->surfaces[0];
 771 }
 772
 773 VG_STATIC struct world_surface *world_contact_surface( world_instance *world,
 774                                                          rb_ct *ct )
 775 {
 776    return world_tri_index_surface( world, ct->element_id );
 777 }
 778
 779 VG_STATIC struct world_surface *ray_hit_surface( world_instance *world,
 780                                                  ray_hit *hit )
 781 {
 782    return world_tri_index_surface( world, hit->tri[0] );
 783 }
 784
 785 /*
 786  * -----------------------------------------------------------------------------
 787  *                              Audio sampling
 788  * -----------------------------------------------------------------------------
 789  */
 790
 791 VG_STATIC
 792 enum audio_sprite_type world_audio_sample_sprite_random(v3f origin, v3f output);
 793 VG_STATIC void world_audio_sample_distances( v3f co, int *index, float *value );
 794
 795 #include "audio.h"
 796
 797 /*
 798  * Trace out a random point, near the player to try and determine water areas
 799  */
 800 VG_STATIC
 801 enum audio_sprite_type world_audio_sample_sprite_random(v3f origin, v3f output)
 802 {
 803    v3f chance = { (vg_randf()-0.5f) * 30.0f,
 804                   8.0f,
 805                   (vg_randf()-0.5f) * 30.0f };
 806
 807    v3f pos;
 808    v3_add( chance, origin, pos );
 809
 810    ray_hit contact;
 811    contact.dist = vg_minf( 16.0f, pos[1] );
 812
 813    world_instance *world = get_active_world();
 814
 815    if( ray_world( world, pos, (v3f){0.0f,-1.0f,0.0f}, &contact ) ){
 816       struct world_surface *mat = ray_hit_surface( world, &contact );
 817
 818       if( mat->info.surface_prop == k_surface_prop_grass){
 819          v3_copy( contact.pos, output );
 820          return k_audio_sprite_type_grass;
 821       }
 822       else{
 823          return k_audio_sprite_type_none;
 824       }
 825    }
 826
 827    output[0] = pos[0];
 828    output[1] = 0.0f;
 829    output[2] = pos[2];
 830
 831    float dist = fabsf(output[1] - origin[1]);
 832
 833    if( world->water.enabled && dist<=40.0f )
 834       return k_audio_sprite_type_water;
 835    else
 836       return k_audio_sprite_type_none;
 837 }
 838
 839 VG_STATIC void world_audio_sample_distances( v3f co, int *index, float *value )
 840 {
 841    float inr3 = 0.57735027,
 842          inr2 = 0.70710678118;
 843
 844    v3f sample_directions[] = {
 845       { -1.0f,  0.0f,  0.0f },
 846       {  1.0f,  0.0f,  0.0f },
 847       {  0.0f,  0.0f,  1.0f },
 848       {  0.0f,  0.0f, -1.0f },
 849       {  0.0f,  1.0f,  0.0f },
 850       {  0.0f, -1.0f,  0.0f },
 851       { -inr3,  inr3,  inr3 },
 852       {  inr3,  inr3,  inr3 },
 853       { -inr3,  inr3, -inr3 },
 854       {  inr3,  inr3, -inr3 },
 855       { -inr2,  0.0f,  inr2 },
 856       {  inr2,  0.0f,  inr2 },
 857       { -inr2,  0.0f, -inr2 },
 858       {  inr2,  0.0f, -inr2 },
 859    };
 860
 861    static int si = 0;
 862    static float distances[16];
 863
 864    ray_hit ray;
 865    ray.dist = 5.0f;
 866
 867    v3f rc, rd, ro;
 868    v3_copy( sample_directions[ si ], rd );
 869    v3_add( co, (v3f){0.0f,1.5f,0.0f}, ro );
 870    v3_copy( ro, rc );
 871
 872    float dist = 200.0f;
 873
 874    for( int i=0; i<10; i++ ){
 875       if( ray_world( get_active_world(), rc, rd, &ray ) ){
 876          dist = (float)i*5.0f + ray.dist;
 877          break;
 878       }
 879       else{
 880          v3_muladds( rc, rd, ray.dist, rc );
 881       }
 882    }
 883
 884    distances[si] = dist;
 885
 886    if( vg_lines.draw ){
 887       for( int i=0; i<14; i++ ){
 888          if( distances[i] != 200.0f ){
 889             u32 colours[] = { VG__RED, VG__BLUE, VG__GREEN,
 890                               VG__CYAN, VG__YELOW, VG__PINK,
 891                               VG__WHITE };
 892
 893             u32 colour = colours[i%7];
 894
 895             v3f p1;
 896             v3_muladds( ro, sample_directions[i], distances[i], p1 );
 897             vg_line( ro, p1, colour );
 898             vg_line_pt3( p1, 0.1f, colour );
 899          }
 900       }
 901    }
 902
 903    *index = si;
 904    *value = dist;
 905
 906    si ++;
 907    if( si >= 14 )
 908       si = 0;
 909 }
 910
 911 #endif /* WORLD_H */