From 69ca8a90af46d7e8113e7e7f29626ef7813295cf Mon Sep 17 00:00:00 2001
From: Nishi <nishi@nishi.boats>
Date: Thu, 28 May 2026 14:23:39 +0900
Subject: [PATCH] fix

---
 client/main.cc      |  6 +++++-
 engine/src/mixer.cc | 11 ++++++++---
 2 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/client/main.cc b/client/main.cc
index 764e08b..09394ec 100644
--- a/client/main.cc
+++ b/client/main.cc
@@ -21,8 +21,12 @@ int main(){
 
 	drv = new fishbone::SoundDriver();
 
-	snd = drv->mixer.open("music.mod");
+	snd = drv->mixer.open("shanghai.mp3");
 	snd->setLoop(true);
+	snd->position[0] = -1;
+	snd->position[1] = 0;
+	snd->position[2] = 0;
+	snd->is3d = true;
 	snd->resume();
 
 	while(!quit);
diff --git a/engine/src/mixer.cc b/engine/src/mixer.cc
index 215be28..fb6f461 100644
--- a/engine/src/mixer.cc
+++ b/engine/src/mixer.cc
@@ -42,17 +42,17 @@ void fishbone::Mixer::read(short* buffer, size_t frames) {
 			float angle, v;
 			float d;
 			float lf, rf;
-
+			
 			for(int j = 0; j < 3; j++) r[j] = this->sounds[i]->position[j] - this->position[j];
 
 			angle = atan2(r[2], r[0]);
 			v     = cos(angle);
 
+			d = sqrt(r[0] * r[0] + r[1] * r[1] + r[2] * r[2]);
+
 			lf = 1.0 - v;
 			rf = 1.0 + v;
 
-			d = sqrt(r[0] * r[0] + r[1] * r[1] + r[2] * r[2]);
-
 			la = 1.0 / (1.0 + lf + d * d);
 			ra = 1.0 / (1.0 + rf + d * d);
 		}
@@ -83,6 +83,11 @@ void fishbone::Mixer::read(short* buffer, size_t frames) {
 				r = req[(j * this->sounds[i]->rate / fishbone::Mixer::rate) * 2 + 1];
 			}
 
+			if(this->sounds[i]->is3d){
+				l = (l + r) / 2;
+				r = l;
+			}
+
 			tmp[2 * j + 0] += l / 32767.0 * la * this->sounds[i]->volume;
 			tmp[2 * j + 1] += r / 32767.0 * ra * this->sounds[i]->volume;
 		}