From a8fa60f5e8370fded3d26994136a924903d9508e Mon Sep 17 00:00:00 2001
From: divverent <divverent@d7cf8633-e32d-0410-b094-e92efae38249>
Date: Sun, 15 Nov 2009 19:31:15 +0000
Subject: [PATCH] first preliminary version of DP_SND_SETPARAMS: let sound()
 calls with sample set to "" modify an existing sound on the given entity and
 channel

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@9499 d7cf8633-e32d-0410-b094-e92efae38249
---
 prvm_cmds.c |  2 +-
 snd_main.c  | 25 +++++++++++++++++++++++--
 svvm_cmds.c |  1 +
 3 files changed, 25 insertions(+), 3 deletions(-)

diff --git a/prvm_cmds.c b/prvm_cmds.c
index 755c0802..ad060cbd 100644
--- a/prvm_cmds.c
+++ b/prvm_cmds.c
@@ -1088,7 +1088,7 @@ void VM_precache_sound (void)
 
 	s = PRVM_G_STRING(OFS_PARM0);
 	PRVM_G_INT(OFS_RETURN) = PRVM_G_INT(OFS_PARM0);
-	VM_CheckEmptyString(s);
+	//VM_CheckEmptyString(s);
 
 	if(snd_initialized.integer && !S_PrecacheSound(s, true, true))
 	{
diff --git a/snd_main.c b/snd_main.c
index 5f60089a..4d4bf704 100644
--- a/snd_main.c
+++ b/snd_main.c
@@ -921,6 +921,7 @@ void S_UnloadAllSounds_f (void)
 S_FindName
 ==================
 */
+sfx_t changevolume_sfx = {""};
 sfx_t *S_FindName (const char *name)
 {
 	sfx_t *sfx;
@@ -928,6 +929,9 @@ sfx_t *S_FindName (const char *name)
 	if (!snd_initialized.integer)
 		return NULL;
 
+	if(!strcmp(name, changevolume_sfx.name))
+		return &changevolume_sfx;
+
 	if (strlen (name) >= sizeof (sfx->name))
 	{
 		Con_Printf ("S_FindName: sound name too long (%s)\n", name);
@@ -1100,7 +1104,7 @@ S_IsSoundPrecached
 */
 qboolean S_IsSoundPrecached (const sfx_t *sfx)
 {
-	return (sfx != NULL && sfx->fetcher != NULL);
+	return (sfx != NULL && sfx->fetcher != NULL) || (sfx == &changevolume_sfx);
 }
 
 /*
@@ -1443,12 +1447,29 @@ void S_PlaySfxOnChannel (sfx_t *sfx, channel_t *target_chan, unsigned int flags,
 
 int S_StartSound (int entnum, int entchannel, sfx_t *sfx, vec3_t origin, float fvol, float attenuation)
 {
-	channel_t *target_chan, *check;
+	channel_t *target_chan, *check, *ch;
 	int		ch_idx;
 
 	if (snd_renderbuffer == NULL || sfx == NULL || nosound.integer)
 		return -1;
 
+	if(sfx == &changevolume_sfx)
+	{
+		if(entchannel == 0)
+			return -1;
+		for (ch_idx=NUM_AMBIENTS ; ch_idx < NUM_AMBIENTS + MAX_DYNAMIC_CHANNELS ; ch_idx++)
+		{
+			ch = &channels[ch_idx];
+			if (ch->entnum == entnum && (ch->entchannel == entchannel || entchannel == -1) )
+			{
+				S_SetChannelVolume(ch_idx, fvol);
+				ch->dist_mult = attenuation / (64.0f * snd_soundradius.value);
+				return ch_idx;
+			}
+		}
+		return -1;
+	}
+
 	if (sfx->fetcher == NULL)
 		return -1;
 
diff --git a/svvm_cmds.c b/svvm_cmds.c
index c23aefb5..fe837a00 100644
--- a/svvm_cmds.c
+++ b/svvm_cmds.c
@@ -120,6 +120,7 @@ char *vm_sv_extensions =
 "DP_SND_DIRECTIONLESSATTNNONE "
 "DP_SND_FAKETRACKS "
 "DP_SND_OGGVORBIS "
+"DP_SND_SETPARAMS "
 "DP_SND_STEREOWAV "
 "DP_SOLIDCORPSE "
 "DP_SPRITE32 "
-- 
2.39.2