From: Guus Sliepen <guus@debian.org>
Date: Sun, 9 Aug 2015 13:54:21 +0000 (+0200)
Subject: Allow playing sounds with stereo effects.
X-Git-Url: https://git.mxchange.org/?a=commitdiff_plain;h=690030e57c1f4aea6dbeef1da632ebb339d6844d;p=quix0rs-blobwars.git

Allow playing sounds with stereo effects.

This is basically a copy of the playSound routine from Project: Starfighter.
---

diff --git a/src/CAudio.cpp b/src/CAudio.cpp
index 98d1a86..e20aece 100644
--- a/src/CAudio.cpp
+++ b/src/CAudio.cpp
@@ -178,7 +178,7 @@ bool Audio::loadMusic(const char *filename)
 	return true;
 }
 
-void Audio::playSound(int snd, int channel)
+void Audio::playSoundRelative(int snd, int channel, float x)
 {
 	if ((!engine->useAudio) || (soundVolume == 0))
 		return;
@@ -188,9 +188,29 @@ void Audio::playSound(int snd, int channel)
 		return;
 	}
 
-	Mix_Volume(channel, soundVolume);
+	int angle = atanf(x / 320) * 180 / M_PI;
+	int attenuation = fabsf(x) / 40;
+
+	if (angle < 0)
+	        angle += 360;
 
+	if (attenuation > 255)
+	        attenuation = 255;
+
+	Mix_Volume(channel, soundVolume);
 	Mix_PlayChannel(channel, sound[snd], 0);
+	Mix_SetPosition(channel, angle, attenuation);
+}
+
+void Audio::playSound(int snd, int channel, float x)
+{
+	x -= (engine->playerPosX + 320);
+	playSoundRelative(snd, channel, x);
+}
+
+void Audio::playSound(int snd, int channel)
+{
+	playSoundRelative(snd, channel, 0);
 }
 
 void Audio::playMusic()
diff --git a/src/CAudio.h b/src/CAudio.h
index 500455a..d9faa5c 100644
--- a/src/CAudio.h
+++ b/src/CAudio.h
@@ -50,6 +50,8 @@ class Audio {
 	void registerEngine(Engine *engine);
 	bool loadSound(int i, const char *filename);
 	bool loadMusic(const char *filename);
+	void playSoundRelative(int snd, int channel, float x);
+	void playSound(int snd, int channel, float x);
 	void playSound(int snd, int channel);
 	void playMusic();
 	void playMusicOnce();