the luxuries of a modern C compiler

[carveJwlIkooP6JGAAIwe30JlM.git] / world_audio.c

diff --git a/world_audio.c b/world_audio.c
new file mode 100644 (file)
index 0000000..facbcc4
--- /dev/null
+++ b/world_audio.c
@@ -0,0 +1,143 @@
+#ifndef WORLD_AUDIO_C
+#define WORLD_AUDIO_C
+
+#include "audio.h"
+#include "world_audio.h"
+
+/* finds any active playing in world and fades them out, we can only do this 
+ * while unloading */
+VG_STATIC void world_fadeout_audio( world_instance *world )
+{
+   if( world->status != k_world_status_unloading ){
+      vg_fatal_error( "World status must be set to 'unloading', to fadeout"
+                      " audio.\n" );
+   }
+
+   u8 world_id = (world - world_static.worlds) + 1;
+
+   audio_lock();
+   for( u32 i=0; i<AUDIO_CHANNELS; i++ ){
+      audio_channel *ch = &vg_audio.channels[i];
+
+      if( ch->allocated && (ch->world_id == world_id) ){
+         ch = audio_channel_fadeout( ch, 1.0f );
+      }
+   }
+   audio_unlock();
+}
+
+/*
+ * Trace out a random point, near the player to try and determine water areas
+ */
+VG_STATIC 
+enum audio_sprite_type world_audio_sample_sprite_random(v3f origin, v3f output)
+{
+   v3f chance = { (vg_randf64()-0.5f) * 30.0f, 
+                  8.0f,
+                  (vg_randf64()-0.5f) * 30.0f };
+   
+   v3f pos;
+   v3_add( chance, origin, pos );
+
+   ray_hit contact;
+   contact.dist = vg_minf( 16.0f, pos[1] );
+
+   world_instance *world = world_current_instance();
+   
+   if( ray_world( world, pos, (v3f){0.0f,-1.0f,0.0f}, &contact ) ){
+      struct world_surface *mat = ray_hit_surface( world, &contact );
+
+      if( mat->info.surface_prop == k_surface_prop_grass){
+         v3_copy( contact.pos, output );
+         return k_audio_sprite_type_grass;
+      }
+      else{
+         return k_audio_sprite_type_none;
+      }
+   }
+
+   output[0] = pos[0];
+   output[1] = 0.0f;
+   output[2] = pos[2];
+
+   float dist = fabsf(output[1] - origin[1]);
+   
+   if( world->water.enabled && dist<=40.0f )
+      return k_audio_sprite_type_water;
+   else
+      return k_audio_sprite_type_none;
+}
+
+VG_STATIC void world_audio_sample_distances( v3f co, int *index, float *value )
+{
+   float inr3 = 0.57735027,
+         inr2 = 0.70710678118;
+
+   v3f sample_directions[] = {
+      { -1.0f,  0.0f,  0.0f },
+      {  1.0f,  0.0f,  0.0f },
+      {  0.0f,  0.0f,  1.0f },
+      {  0.0f,  0.0f, -1.0f },
+      {  0.0f,  1.0f,  0.0f },
+      {  0.0f, -1.0f,  0.0f },
+      { -inr3,  inr3,  inr3 },
+      {  inr3,  inr3,  inr3 },
+      { -inr3,  inr3, -inr3 },
+      {  inr3,  inr3, -inr3 },
+      { -inr2,  0.0f,  inr2 },
+      {  inr2,  0.0f,  inr2 },
+      { -inr2,  0.0f, -inr2 },
+      {  inr2,  0.0f, -inr2 },
+   };
+
+   static int si = 0;
+   static float distances[16];
+
+   ray_hit ray;
+   ray.dist = 5.0f;
+
+   v3f rc, rd, ro;
+   v3_copy( sample_directions[ si ], rd );
+   v3_add( co, (v3f){0.0f,1.5f,0.0f}, ro );
+   v3_copy( ro, rc );
+
+   float dist = 200.0f;
+
+   for( int i=0; i<10; i++ ){
+      if( ray_world( world_current_instance(), rc, rd, &ray ) ){
+         dist = (float)i*5.0f + ray.dist;
+         break;
+      }
+      else{
+         v3_muladds( rc, rd, ray.dist, rc );
+      }
+   }
+
+   distances[si] = dist;
+
+   if( vg_lines.draw ){
+      for( int i=0; i<14; i++ ){
+         if( distances[i] != 200.0f ){
+            u32 colours[] = { VG__RED, VG__BLUE, VG__GREEN,
+                              VG__CYAN, VG__YELOW, VG__PINK,
+                              VG__WHITE };
+
+            u32 colour = colours[i%7];
+
+            v3f p1;
+            v3_muladds( ro, sample_directions[i], distances[i], p1 );
+            vg_line( ro, p1, colour );
+            vg_line_pt3( p1, 0.1f, colour );
+         }
+      }
+   }
+
+   *index = si;
+   *value = dist;
+
+   si ++;
+   if( si >= 14 )
+      si = 0;
+}
+
+#endif /* WORLD_AUDIO_C */