add stereo panning

1 files changed, 9 insertions, 2 deletions

diff --git a/src/channel.c b/src/channel.c
index a29e7f7..d039701 100644
--- a/src/channel.c
+++ b/src/channel.c
@@ -106,8 +106,15 @@ void channel_get_next_sample(float *left, float *right, struct channel_t *chan)
 		float l, r;
 		l = chan->sound.left[chan->pos];
 		r = chan->sound.right[chan->pos];
-		*left = volume * l;
-		*right = volume * r;
+
+		float pan_l = ((float)p_atomic_int_get(&(chan->pan_left)))/128;
+		float pan_r = ((float)p_atomic_int_get(&(chan->pan_right)))/128;
+		float gain_ll, gain_lr, gain_rl, gain_rr;
+		pan_gain(&gain_ll, &gain_lr, pan_l);
+		pan_gain(&gain_rl, &gain_rr, pan_r);
+
+		*left = volume * ((gain_ll * l) + (gain_rl * r));
+		*right = volume * ((gain_lr * l) + (gain_rr * r));
 	}
 
 	chan->pos += 1;