add cvars: snd_attenuation_exponent, snd_attenuation_decibel

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@11396 d7cf8633-e32d-0410-b094-e92efae38249
::stable-branch::merge=4134bf6102c7d2c50c55658757a7e43cee244cb3

diff --git a/snd_main.c b/snd_main.c
index d0d7cfd26603332b5dfcd59b6b0c51e6b893213b..2f7e871af7a4ed32f33b700ab555738bc93081d8 100644 (file)
--- a/snd_main.c
+++ b/snd_main.c
@@ -165,6 +165,8 @@ cvar_t volume = {CVAR_SAVE, "volume", "0.7", "volume of sound effects"};
 cvar_t snd_initialized = { CVAR_READONLY, "snd_initialized", "0", "indicates the sound subsystem is active"};
 cvar_t snd_staticvolume = {CVAR_SAVE, "snd_staticvolume", "1", "volume of ambient sound effects (such as swampy sounds at the start of e1m2)"};
 cvar_t snd_soundradius = {CVAR_SAVE, "snd_soundradius", "1200", "radius of weapon sounds and other standard sound effects (monster idle noises are half this radius and flickering light noises are one third of this radius)"};
+cvar_t snd_attenuation_exponent = {CVAR_SAVE, "snd_attenuation_exponent", "1", "Exponent of (1-radius) in sound attenuation formula"};
+cvar_t snd_attenuation_decibel = {CVAR_SAVE, "snd_attenuation_decibel", "0", "Decibel sound attenuation per sound radius distance"};
 cvar_t snd_spatialization_min_radius = {CVAR_SAVE, "snd_spatialization_min_radius", "10000", "use minimum spatialization above to this radius"};
 cvar_t snd_spatialization_max_radius = {CVAR_SAVE, "snd_spatialization_max_radius", "100", "use maximum spatialization below this radius"};
 cvar_t snd_spatialization_min = {CVAR_SAVE, "snd_spatialization_min", "0.70", "minimum spatializazion of sounds"};
@@ -837,6 +839,9 @@ void S_Init(void)
        Cvar_RegisterVariable(&snd_channel6volume);
        Cvar_RegisterVariable(&snd_channel7volume);
 
+       Cvar_RegisterVariable(&snd_attenuation_exponent);
+       Cvar_RegisterVariable(&snd_attenuation_decibel);
+
        Cvar_RegisterVariable(&snd_spatialization_min_radius);
        Cvar_RegisterVariable(&snd_spatialization_max_radius);
        Cvar_RegisterVariable(&snd_spatialization_min);
@@ -1452,9 +1457,10 @@ void SND_Spatialize_WithSfx(channel_t *ch, qboolean isstatic, sfx_t *sfx)
                dist = VectorLength(source_vec);
                f = dist * ch->distfade;
 
-               // TODO falloff formulas
-               f = (1.0 - f); // Quake
-               //f = (1.0 - f) / (1.0 + f * f); // same as rtlights use
+               f =
+                       ((snd_attenuation_exponent.value == 0) ? 1.0 : pow(1.0 - min(1.0, f), snd_attenuation_exponent.value))
+                       *
+                       ((snd_attenuation_decibel.value == 0) ? 1.0 : pow(0.1, 0.1 * snd_attenuation_decibel.value * f));
 
                intensity = mastervol * f;
                if (intensity > 0)