Sound queue

This is to queue sounds and play them when we update the screen, so the
sounds are synced with the action.

It is required because the MikMod_Update function updates on the clock
int, and is not synced with the VGA's vsync.

1 files changed, 27 insertions, 0 deletions

diff --git a/src/sound.c b/src/sound.c
index f57c133..4a608cf 100644
--- a/src/sound.c
+++ b/src/sound.c
@@ -29,6 +29,11 @@ static uint32_t voice = 0;
 
 static MODULE *music = NULL;
 
+#define MAX_QUEUE 4
+
+static uint8_t queue[MAX_QUEUE];
+static uint8_t queue_top;
+
 uint8_t sound_init()
 {
     MikMod_RegisterAllDrivers();
@@ -61,6 +66,8 @@ uint8_t sound_init()
     Player_Start(music);
     MikMod_EnableOutput();
 
+    queue_top = 0;
+
     return 1;
 }
 
@@ -73,7 +80,9 @@ void sound_update()
     if (++divider == 10)
     {
         divider = 0;
+        MikMod_Lock();
         MikMod_Update();
+        MikMod_Unlock();
     }
 }
 
@@ -114,3 +123,21 @@ void sound_play_efx(uint8_t efxno)
     cur = efxno;
     voice = Sample_Play(efx[cur].s, 0, 0);
 }
+
+void sound_queue_efx(uint8_t efxno)
+{
+    if (queue_top >= MAX_QUEUE)
+        return;
+
+    queue[queue_top++] = efxno;
+}
+
+void sound_play_queue()
+{
+    while (queue_top > 0)
+        sound_play_efx(queue[--queue_top]);
+
+    MikMod_Lock();
+    MikMod_Update();
+    MikMod_Unlock();
+}