From a84dfac0d70c5d7251cce8276ea09e9cf2c8cd68 Mon Sep 17 00:00:00 2001
From: Nishi <nishi@nishi.boats>
Date: Thu, 28 May 2026 14:07:42 +0900
Subject: [PATCH] 3d audio

---
 client/main.cc                    |  2 +-
 engine/include/fishbone/machdep.h |  1 +
 engine/include/fishbone/mixer.h   |  1 +
 engine/include/fishbone/sound.h   |  7 +++++--
 engine/src/mixer.cc               | 35 ++++++++++++++++++++++++++++---
 engine/src/sound.cc               |  9 ++++++--
 engine/src/sounddrv/sdl2.cc       |  1 +
 7 files changed, 48 insertions(+), 8 deletions(-)

diff --git a/client/main.cc b/client/main.cc
index 6b8bfb9..764e08b 100644
--- a/client/main.cc
+++ b/client/main.cc
@@ -21,7 +21,7 @@ int main(){
 
 	drv = new fishbone::SoundDriver();
 
-	snd = drv->mixer.open("shanghai.ogg");
+	snd = drv->mixer.open("music.mod");
 	snd->setLoop(true);
 	snd->resume();
 
diff --git a/engine/include/fishbone/machdep.h b/engine/include/fishbone/machdep.h
index 0af9a73..90879c8 100644
--- a/engine/include/fishbone/machdep.h
+++ b/engine/include/fishbone/machdep.h
@@ -6,6 +6,7 @@
 #include <fstream>
 
 #include <cstdio>
+#include <cmath>
 
 #include <fishbone/config.h>
 
diff --git a/engine/include/fishbone/mixer.h b/engine/include/fishbone/mixer.h
index 34ec0e0..f7dc895 100644
--- a/engine/include/fishbone/mixer.h
+++ b/engine/include/fishbone/mixer.h
@@ -25,6 +25,7 @@ namespace fishbone {
 		static const int		    rate = 44100;
 		std::vector<fishbone::SoundLoader*> loaders;
 		std::vector<fishbone::Sound*>	    sounds;
+		float				    position[3];
 	};
 }; // namespace fishbone
 
diff --git a/engine/include/fishbone/sound.h b/engine/include/fishbone/sound.h
index 330de47..6e0e873 100644
--- a/engine/include/fishbone/sound.h
+++ b/engine/include/fishbone/sound.h
@@ -87,8 +87,11 @@ namespace fishbone {
 		void setLoop(bool v);
 		bool isLoop();
 
-		int rate;
-		int channels;
+		int   rate;
+		int   channels;
+		float volume;
+		bool  is3d;
+		float position[3];
 	};
 
 #define LOADER(X) FB_SOUND_DEF(X);
diff --git a/engine/src/mixer.cc b/engine/src/mixer.cc
index fef9817..215be28 100644
--- a/engine/src/mixer.cc
+++ b/engine/src/mixer.cc
@@ -6,6 +6,10 @@ fishbone::Mixer::Mixer() {
 #define LOADER(X) this->loaders.push_back(new fishbone::X##SoundLoader());
 	FB_SOUND_LOADERS
 #undef LOADER
+
+	this->position[0] = 0;
+	this->position[1] = 0;
+	this->position[2] = 0;
 }
 
 fishbone::Mixer::~Mixer() {
@@ -29,9 +33,30 @@ void fishbone::Mixer::read(short* buffer, size_t frames) {
 		size_t ask;
 		short* req;
 		size_t got;
+		float  la = 1, ra = 1;
 
 		if(this->sounds[i]->isPaused()) continue;
 
+		if(this->sounds[i]->is3d) {
+			float r[3];
+			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);
+
+			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);
+		}
+
 		ask = frames * this->sounds[i]->rate / fishbone::Mixer::rate;
 		req = new short[ask * this->sounds[i]->channels];
 		got = this->sounds[i]->read(req, ask) * fishbone::Mixer::rate / this->sounds[i]->rate;
@@ -39,7 +64,11 @@ void fishbone::Mixer::read(short* buffer, size_t frames) {
 		if(got <= 0) {
 			delete[] req;
 
-			this->sounds[i]->pauseNoLock();
+			if(this->sounds[i]->isLoop()) {
+				this->sounds[i]->seek(0);
+			} else {
+				this->sounds[i]->pauseNoLock();
+			}
 
 			continue;
 		}
@@ -54,8 +83,8 @@ void fishbone::Mixer::read(short* buffer, size_t frames) {
 				r = req[(j * this->sounds[i]->rate / fishbone::Mixer::rate) * 2 + 1];
 			}
 
-			tmp[2 * j + 0] += l / 32767.0;
-			tmp[2 * j + 1] += r / 32767.0;
+			tmp[2 * j + 0] += l / 32767.0 * la * this->sounds[i]->volume;
+			tmp[2 * j + 1] += r / 32767.0 * ra * this->sounds[i]->volume;
 		}
 
 		delete[] req;
diff --git a/engine/src/sound.cc b/engine/src/sound.cc
index 80a85fd..dba736a 100644
--- a/engine/src/sound.cc
+++ b/engine/src/sound.cc
@@ -22,8 +22,13 @@ fishbone::Sound::Sound(fishbone::Mixer* mixer, fishbone::SoundLoader* loader, st
 	this->loader = loader;
 	this->impl   = impl;
 
-	this->paused = true;
-	this->loop   = false;
+	this->paused	  = true;
+	this->loop	  = false;
+	this->volume	  = 1.0;
+	this->is3d	  = false;
+	this->position[0] = 0;
+	this->position[1] = 0;
+	this->position[2] = 0;
 }
 
 int fishbone::Sound::read(short* buffer, size_t frames) {
diff --git a/engine/src/sounddrv/sdl2.cc b/engine/src/sounddrv/sdl2.cc
index 91a5a85..6e97242 100644
--- a/engine/src/sounddrv/sdl2.cc
+++ b/engine/src/sounddrv/sdl2.cc
@@ -43,5 +43,6 @@ fishbone::SoundDriver::SoundDriver() {
 fishbone::SoundDriver::~SoundDriver() {
 	SDL_PauseAudioDevice(this->impl->id, 1);
 	SDL_CloseAudioDevice(this->impl->id);
+	delete this->impl;
 }
 #endif