audio.h

   1 #include "common.h"
   2 static void audio_spacialize( sfx_system *sys,
   3                               v3f pos, v3f camera, v3f ears, float vol );
   4
   5 #ifndef AUDIO_H
   6 #define AUDIO_H
   7
   8 #include "world.h"
   9
  10 static float audio_occlusion_current = 0.0f,
  11              k_audio_occlusion_rate  = 1.0f;
  12
  13 static int   k_audio_debug_soundscape = 0;
  14
  15 sfx_set audio_board =
  16 {
  17    .sources = "sound/skate.ogg\0"
  18               "sound/wheel.ogg\0"
  19               "sound/slide.ogg\0"
  20               "sound/reverb.ogg\0"
  21 };
  22
  23 sfx_system audio_player0 =
  24 {
  25    .vol = 0.0f,
  26    .ch = 1,
  27    .vol_src = &audio_vol_all,
  28    .name = "Player0",
  29    .flags = SFX_FLAG_REPEAT | SFX_FLAG_PERSISTENT
  30 };
  31
  32 sfx_system audio_player1 =
  33 {
  34    .vol = 0.0f,
  35    .ch = 1,
  36    .vol_src = &audio_vol_all,
  37    .name = "Player1",
  38    .flags = SFX_FLAG_REPEAT | SFX_FLAG_PERSISTENT
  39 };
  40
  41 sfx_system audio_player2 =
  42 {
  43    .vol = 0.0f,
  44    .ch = 1,
  45    .vol_src = &audio_vol_all,
  46    .name = "Player2",
  47    .flags = SFX_FLAG_REPEAT | SFX_FLAG_PERSISTENT
  48 };
  49
  50 sfx_system audio_player3 =
  51 {
  52    .vol = 0.0f,
  53    .ch = 1,
  54    .vol_src = &audio_vol_all,
  55    .name = "Player3",
  56    .flags = SFX_FLAG_REPEAT | SFX_FLAG_PERSISTENT
  57 };
  58
  59 static void audio_init(void)
  60 {
  61    sfx_set_init( &audio_board, NULL );
  62    sfx_set_play( &audio_board, &audio_player0, 0 );
  63    sfx_set_play( &audio_board, &audio_player1, 1 );
  64    sfx_set_play( &audio_board, &audio_player2, 2 );
  65    sfx_set_play( &audio_board, &audio_player3, 3 );
  66
  67    vg_convar_push( (struct vg_convar){
  68       .name = "aud_debug_soundscape",
  69       .data = &k_audio_debug_soundscape,
  70       .data_type = k_convar_dtype_i32,
  71       .opt_i32 = { .min=0, .max=1, .clamp=0 },
  72       .persistent = 1
  73    });
  74
  75    vg_convar_push( (struct vg_convar){
  76       .name = "aud_occlusion_rate",
  77       .data = &k_audio_occlusion_rate,
  78       .data_type = k_convar_dtype_f32,
  79       .opt_f32 = { .clamp = 0 },
  80       .persistent = 1
  81    });
  82 }
  83
  84 static void audio_free(void)
  85 {
  86    sfx_set_free( &audio_board );
  87 }
  88
  89 static void audio_spacialize( sfx_system *sys,
  90                               v3f pos, v3f camera, v3f ears, float vol )
  91 {
  92    float attn = (v3_dist( pos, camera ) / vol) +1.0f;
  93
  94    v3f delta;
  95    v3_sub( pos, camera, delta );
  96    v3_normalize( delta );
  97
  98    float pan = v3_dot( ears, delta );
  99
 100    sys->vol = 1.0f/(attn*attn);
 101    sys->pan = pan;
 102 }
 103
 104 static void audio_sample_occlusion( v3f origin )
 105 {
 106    float d = 0.0f,
 107          sample_dist = 880.0f;
 108
 109    int sample_count = 8;
 110
 111    for( int i=0; i<sample_count; i++ )
 112    {
 113       v3f dir;
 114       vg_rand_dir( dir );
 115
 116       ray_hit contact;
 117       contact.dist = 15.0f;
 118
 119       if( ray_world( origin, dir, &contact ) )
 120       {
 121          d += contact.dist;
 122
 123          vg_line( origin, contact.pos, 0xff0000ff );
 124          vg_line_pt3( contact.pos, 0.1f, 0xff0000ff );
 125       }
 126       else
 127       {
 128          v3f p1;
 129          v3_muladds( origin, dir, sample_dist, p1 );
 130          vg_line( origin, p1, 0xffcccccc );
 131
 132          d += sample_dist;
 133       }
 134    }
 135
 136    float occlusion = 1.0f - (d * (1.0f/(sample_dist*(float)sample_count))),
 137          rate = ktimestep * k_audio_occlusion_rate,
 138          target = powf( occlusion, 6.0f );
 139    audio_occlusion_current = vg_lerpf( audio_occlusion_current, target, rate );
 140 }
 141
 142 static void audio_debug_soundscapes(void)
 143 {
 144    if( !k_audio_debug_soundscape ) return;
 145
 146    char buf[64];
 147    snprintf( buf, 31, "occlusion: %.5f", audio_occlusion_current );
 148
 149    ui_global_ctx.cursor[0] = 250;
 150    ui_global_ctx.cursor[1] = 10;
 151    ui_global_ctx.cursor[2] = audio_occlusion_current * 200.0f;
 152    ui_global_ctx.cursor[3] = 20;
 153
 154    gui_fill_rect( ui_global_ctx.cursor, 0x55cccccc );
 155    gui_text( ui_global_ctx.cursor, buf, 1, 0 );
 156 }
 157
 158 #endif /* AUDIO_H */