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authorpeter1138 <peter1138@openttd.org>2005-11-04 10:02:50 +0000
committerpeter1138 <peter1138@openttd.org>2005-11-04 10:02:50 +0000
commit04134d14812eb40bec7c689742f409b428307aee (patch)
treed385563bd69ccdddd04721470a7aa608624fe85a
parentc8ea909811073869094919b2ad3a63f2251396a3 (diff)
downloadopenttd-04134d14812eb40bec7c689742f409b428307aee.tar.xz
(svn r3131) Enable panning of audio relative to screen position.
-rw-r--r--sound.c17
1 files changed, 12 insertions, 5 deletions
diff --git a/sound.c b/sound.c
index a6b379f99..46b319cdc 100644
--- a/sound.c
+++ b/sound.c
@@ -23,6 +23,8 @@ static uint _file_count;
static FileEntry* _files;
#define SOUND_SLOT 31
+// Number of levels of panning per side
+#define PANNING_LEVELS 16
static void OpenBankFile(const char *filename)
@@ -132,15 +134,20 @@ bool SoundInitialize(const char *filename)
}
// Low level sound player
-static void StartSound(uint sound, uint panning, uint volume)
+static void StartSound(uint sound, int panning, uint volume)
{
MixerChannel* mc;
+ uint left_vol, right_vol;
if (volume == 0) return;
mc = MxAllocateChannel(_mixer);
if (mc == NULL) return;
if (!SetBankSource(mc, sound)) return;
- MxSetChannelVolume(mc, volume << 8, volume << 8);
+
+ panning = clamp(panning, -PANNING_LEVELS, PANNING_LEVELS);
+ left_vol = (volume * PANNING_LEVELS) - (volume * panning);
+ right_vol = (volume * PANNING_LEVELS) + (volume * panning);
+ MxSetChannelVolume(mc, left_vol * 128 / PANNING_LEVELS, right_vol * 128 / PANNING_LEVELS);
MxActivateChannel(mc);
}
@@ -185,11 +192,11 @@ static void SndPlayScreenCoordFx(SoundFx sound, int x, int y)
if (vp != NULL &&
IS_INSIDE_1D(x, vp->virtual_left, vp->virtual_width) &&
IS_INSIDE_1D(y, vp->virtual_top, vp->virtual_height)) {
- int left = ((x - vp->virtual_left) >> vp->zoom) + vp->left;
+ int left = (x - vp->virtual_left);
StartSound(
_sound_idx[sound],
- clamp(left / 71, 0, 8),
+ left / (vp->virtual_width / ((PANNING_LEVELS << 1) + 1)) - PANNING_LEVELS,
(_sound_base_vol[sound] * msf.effect_vol * _vol_factor_by_zoom[vp->zoom]) >> 15
);
return;
@@ -219,7 +226,7 @@ void SndPlayFx(SoundFx sound)
{
StartSound(
_sound_idx[sound],
- 4,
+ 0,
(_sound_base_vol[sound] * msf.effect_vol) >> 7
);
}