world_audio.c

   1 #include "audio.h"
   2 #include "world_audio.h"
   3
   4 /* finds any active playing in world and fades them out, we can only do this
   5  * while unloading */
   6 void world_fadeout_audio( world_instance *world )
   7 {
   8    if( world->status != k_world_status_unloading ){
   9       vg_fatal_error( "World status must be set to 'unloading', to fadeout"
  10                       " audio.\n" );
  11    }
  12
  13    u8 world_id = (world - world_static.instances) + 1;
  14
  15    audio_lock();
  16    for( u32 i=0; i<AUDIO_CHANNELS; i++ ){
  17       audio_channel *ch = &vg_audio.channels[i];
  18
  19       if( ch->allocated && (ch->world_id == world_id) ){
  20          ch = audio_channel_fadeout( ch, 1.0f );
  21       }
  22    }
  23    audio_unlock();
  24 }
  25
  26 /*
  27  * Trace out a random point, near the player to try and determine water areas
  28  */
  29 enum audio_sprite_type world_audio_sample_sprite_random(v3f origin, v3f output)
  30 {
  31    v3f chance = { (vg_randf64(&vg.rand)-0.5f) * 30.0f,
  32                   8,
  33                   (vg_randf64(&vg.rand)-0.5f) * 30.0f };
  34
  35    v3f pos;
  36    v3_add( chance, origin, pos );
  37
  38    ray_hit contact;
  39    contact.dist = vg_minf( 16.0f, pos[1] );
  40
  41    world_instance *world = world_current_instance();
  42
  43    if( ray_world( world, pos, (v3f){0.0f,-1.0f,0.0f}, &contact,
  44             k_material_flag_ghosts ) ){
  45       struct world_surface *mat = ray_hit_surface( world, &contact );
  46
  47       if( mat->info.surface_prop == k_surface_prop_grass){
  48          v3_copy( contact.pos, output );
  49          return k_audio_sprite_type_grass;
  50       }
  51       else{
  52          return k_audio_sprite_type_none;
  53       }
  54    }
  55
  56    output[0] = pos[0];
  57    output[1] = 0.0f;
  58    output[2] = pos[2];
  59
  60    float dist = fabsf(output[1] - origin[1]);
  61
  62    if( world->water.enabled && dist<=40.0f )
  63       return k_audio_sprite_type_water;
  64    else
  65       return k_audio_sprite_type_none;
  66 }
  67
  68 void world_audio_sample_distances( v3f co, int *index, float *value )
  69 {
  70    float inr3 = 0.57735027,
  71          inr2 = 0.70710678118;
  72
  73    v3f sample_directions[] = {
  74       { -1.0f,  0.0f,  0.0f },
  75       {  1.0f,  0.0f,  0.0f },
  76       {  0.0f,  0.0f,  1.0f },
  77       {  0.0f,  0.0f, -1.0f },
  78       {  0.0f,  1.0f,  0.0f },
  79       {  0.0f, -1.0f,  0.0f },
  80       { -inr3,  inr3,  inr3 },
  81       {  inr3,  inr3,  inr3 },
  82       { -inr3,  inr3, -inr3 },
  83       {  inr3,  inr3, -inr3 },
  84       { -inr2,  0.0f,  inr2 },
  85       {  inr2,  0.0f,  inr2 },
  86       { -inr2,  0.0f, -inr2 },
  87       {  inr2,  0.0f, -inr2 },
  88    };
  89
  90    static int si = 0;
  91    static float distances[16];
  92
  93    ray_hit ray;
  94    ray.dist = 5.0f;
  95
  96    v3f rc, rd, ro;
  97    v3_copy( sample_directions[ si ], rd );
  98    v3_add( co, (v3f){0.0f,1.5f,0.0f}, ro );
  99    v3_copy( ro, rc );
 100
 101    float dist = 200.0f;
 102
 103    for( int i=0; i<10; i++ ){
 104       if( ray_world( world_current_instance(), rc, rd, &ray,
 105                      k_material_flag_ghosts ) ){
 106          dist = (float)i*5.0f + ray.dist;
 107          break;
 108       }
 109       else{
 110          v3_muladds( rc, rd, ray.dist, rc );
 111       }
 112    }
 113
 114    distances[si] = dist;
 115
 116    if( vg_audio.debug_ui && vg_lines.enabled ){
 117       for( int i=0; i<14; i++ ){
 118          if( distances[i] != 200.0f ){
 119             u32 colours[] = { VG__RED, VG__BLUE, VG__GREEN,
 120                               VG__CYAN, VG__YELOW, VG__PINK,
 121                               VG__WHITE };
 122
 123             u32 colour = colours[i%7];
 124
 125             v3f p1;
 126             v3_muladds( ro, sample_directions[i], distances[i], p1 );
 127             vg_line( ro, p1, colour );
 128             vg_line_point( p1, 0.1f, colour );
 129          }
 130       }
 131    }
 132
 133    *index = si;
 134    *value = dist;
 135
 136    si ++;
 137    if( si >= 14 )
 138       si = 0;
 139 }