rename max_instances back to parallel_sfx_limit and make configurable

src/m_misc.c

@@ -2253,6 +2253,13 @@ default_t defaults[] = {
     "1 to play sounds in full length"
   },
 
+  {
+    "parallel_sfx_limit",
+    (config_t *) &parallel_sfx_limit, NULL,
+    {3}, {1, MAX_CHANNELS}, number, ss_none, wad_no,
+    "parallel same-sound limit"
+  },
+
   // [FG] music backend
   {
     "midi_player",

src/s_sound.c

@@ -250,7 +250,7 @@ static int S_CompareChannels(const void *arg_a, const void *arg_b)
 }
 
 // How many instances of the same sfx can be playing concurrently
-static const unsigned int max_instances = 3;
+int parallel_sfx_limit = 3;
 
 //
 // S_getChannel :
@@ -299,7 +299,7 @@ static int S_getChannel(const mobj_t *origin, sfxinfo_t *sfxinfo,
      // Limit the number of identical sounds playing at once
      if (channels[cnum].sfxinfo == sfxinfo)
      {
-       if (++instances >= max_instances)
+       if (++instances >= parallel_sfx_limit)
        {
          if (priority < channels[cnum].priority)
          {

src/sounds.h

@@ -80,6 +80,8 @@ typedef struct sfxinfo_struct {
   unsigned int alen;   // length of converted sound pointed to by data
 } sfxinfo_t;
 
+extern int parallel_sfx_limit;
+
 //
 // MusicInfo struct.
 //