world_audio.c

   1 #ifndef WORLD_AUDIO_C
   2 #define WORLD_AUDIO_C
   3
   4 #include "audio.h"
   5 #include "world_audio.h"
   6
   7 /* finds any active playing in world and fades them out, we can only do this
   8  * while unloading */
   9 static void world_fadeout_audio( world_instance *world )
  10 {
  11    if( world->status != k_world_status_unloading ){
  12       vg_fatal_error( "World status must be set to 'unloading', to fadeout"
  13                       " audio.\n" );
  14    }
  15
  16    u8 world_id = (world - world_static.instances) + 1;
  17
  18    audio_lock();
  19    for( u32 i=0; i<AUDIO_CHANNELS; i++ ){
  20       audio_channel *ch = &vg_audio.channels[i];
  21
  22       if( ch->allocated && (ch->world_id == world_id) ){
  23          ch = audio_channel_fadeout( ch, 1.0f );
  24       }
  25    }
  26    audio_unlock();
  27 }
  28
  29 /*
  30  * Trace out a random point, near the player to try and determine water areas
  31  */
  32 static
  33 enum audio_sprite_type world_audio_sample_sprite_random(v3f origin, v3f output)
  34 {
  35    v3f chance = { (vg_randf64()-0.5f) * 30.0f,
  36                   8.0f,
  37                   (vg_randf64()-0.5f) * 30.0f };
  38
  39    v3f pos;
  40    v3_add( chance, origin, pos );
  41
  42    ray_hit contact;
  43    contact.dist = vg_minf( 16.0f, pos[1] );
  44
  45    world_instance *world = world_current_instance();
  46
  47    if( ray_world( world, pos, (v3f){0.0f,-1.0f,0.0f}, &contact,
  48             k_material_flag_ghosts ) ){
  49       struct world_surface *mat = ray_hit_surface( world, &contact );
  50
  51       if( mat->info.surface_prop == k_surface_prop_grass){
  52          v3_copy( contact.pos, output );
  53          return k_audio_sprite_type_grass;
  54       }
  55       else{
  56          return k_audio_sprite_type_none;
  57       }
  58    }
  59
  60    output[0] = pos[0];
  61    output[1] = 0.0f;
  62    output[2] = pos[2];
  63
  64    float dist = fabsf(output[1] - origin[1]);
  65
  66    if( world->water.enabled && dist<=40.0f )
  67       return k_audio_sprite_type_water;
  68    else
  69       return k_audio_sprite_type_none;
  70 }
  71
  72 static void world_audio_sample_distances( v3f co, int *index, float *value )
  73 {
  74    float inr3 = 0.57735027,
  75          inr2 = 0.70710678118;
  76
  77    v3f sample_directions[] = {
  78       { -1.0f,  0.0f,  0.0f },
  79       {  1.0f,  0.0f,  0.0f },
  80       {  0.0f,  0.0f,  1.0f },
  81       {  0.0f,  0.0f, -1.0f },
  82       {  0.0f,  1.0f,  0.0f },
  83       {  0.0f, -1.0f,  0.0f },
  84       { -inr3,  inr3,  inr3 },
  85       {  inr3,  inr3,  inr3 },
  86       { -inr3,  inr3, -inr3 },
  87       {  inr3,  inr3, -inr3 },
  88       { -inr2,  0.0f,  inr2 },
  89       {  inr2,  0.0f,  inr2 },
  90       { -inr2,  0.0f, -inr2 },
  91       {  inr2,  0.0f, -inr2 },
  92    };
  93
  94    static int si = 0;
  95    static float distances[16];
  96
  97    ray_hit ray;
  98    ray.dist = 5.0f;
  99
 100    v3f rc, rd, ro;
 101    v3_copy( sample_directions[ si ], rd );
 102    v3_add( co, (v3f){0.0f,1.5f,0.0f}, ro );
 103    v3_copy( ro, rc );
 104
 105    float dist = 200.0f;
 106
 107    for( int i=0; i<10; i++ ){
 108       if( ray_world( world_current_instance(), rc, rd, &ray,
 109                      k_material_flag_ghosts ) ){
 110          dist = (float)i*5.0f + ray.dist;
 111          break;
 112       }
 113       else{
 114          v3_muladds( rc, rd, ray.dist, rc );
 115       }
 116    }
 117
 118    distances[si] = dist;
 119
 120    if( vg_audio.debug_ui && vg_lines.draw ){
 121       for( int i=0; i<14; i++ ){
 122          if( distances[i] != 200.0f ){
 123             u32 colours[] = { VG__RED, VG__BLUE, VG__GREEN,
 124                               VG__CYAN, VG__YELOW, VG__PINK,
 125                               VG__WHITE };
 126
 127             u32 colour = colours[i%7];
 128
 129             v3f p1;
 130             v3_muladds( ro, sample_directions[i], distances[i], p1 );
 131             vg_line( ro, p1, colour );
 132             vg_line_point( p1, 0.1f, colour );
 133          }
 134       }
 135    }
 136
 137    *index = si;
 138    *value = dist;
 139
 140    si ++;
 141    if( si >= 14 )
 142       si = 0;
 143 }
 144
 145 #endif /* WORLD_AUDIO_C */