Function S_SpatializeOrigin

code/client/snd_dma.cpp:1350–1428

================= S_SpatializeOrigin Used for spatializing s_channels ================= */

=================
*/
static void S_SpatializeOrigin (const vec3_t origin, float master_vol, int *left_vol, int *right_vol, soundChannel_t channel)
{
    vec_t		dot;
    vec_t		dist;
    vec_t		lscale, rscale, scale;
    vec3_t		source_vec;
	float		dist_mult = SOUND_ATTENUATE;

	// calculate stereo seperation and distance attenuation
	VectorSubtract(origin, listener_origin, source_vec);

	dist = VectorNormalize(source_vec);
	if ( channel == CHAN_VOICE )
	{
		dist -= SOUND_FULLVOLUME * 3.0f;
//		dist_mult = VOICE_ATTENUATE;	// tweak added (this fixes an NPC dialogue "in your ears" bug, but we're not sure if it'll make a bunch of others fade too early. Too close to shipping...)
	}
	else if ( channel == CHAN_LESS_ATTEN )
	{
		dist -= SOUND_FULLVOLUME * 5.0f; // maybe is too large
	}
	else if ( channel == CHAN_VOICE_ATTEN )
	{
		dist -= SOUND_FULLVOLUME * 1.35f; // used to be 0.15f, dropped off too sharply - dmv
		dist_mult = VOICE_ATTENUATE;
	}
	else if ( channel == CHAN_VOICE_GLOBAL )
	{
		dist = -1;
	}
	else	// use normal attenuation.
	{
		dist -= SOUND_FULLVOLUME;
	}

	if (dist < 0)
	{
		dist = 0;			// close enough to be at full volume
	}
	dist *= dist_mult;		// different attenuation levels

	dot = -DotProduct(listener_axis[1], source_vec);

	if (dma.channels == 1)	// || !dist_mult)
	{ // no attenuation = no spatialization
		rscale = SOUND_FMAXVOL;
		lscale = SOUND_FMAXVOL;
	}
	else
	{
		//rscale = 0.5 * (1.0 + dot);
		//lscale = 0.5 * (1.0 - dot);
		rscale = s_separation->value + ( 1.0f - s_separation->value ) * dot;
		lscale = s_separation->value - ( 1.0f - s_separation->value ) * dot;
		if ( rscale < 0 )
		{
			rscale = 0;
		}