Audio: Allow adjusting BGS and SE volumes via mkxp.conf

src/audio.cpp

@@ -73,6 +73,8 @@ struct AudioPrivate
 		meWatch.state = MeNotPlaying;
 		meWatch.thread = createSDLThread
 			<AudioPrivate, &AudioPrivate::meWatchFun>(this, "audio_mewatch");
+
+		bgs.setVolume(AudioStream::Config, rtData.config.volume.bgs);
 	}
 
 	~AudioPrivate()

src/audiostream.h

@@ -49,6 +49,7 @@ struct AudioStream
 		FadeOut,
 		FadeIn,
 		External,
+		Config,
 
 		VolumeTypeCount
 	};

src/config.cpp

@@ -183,6 +183,8 @@ void Config::read(int argc, char *argv[])
 	PO_DESC(midi.chorus, bool, false) \
 	PO_DESC(midi.reverb, bool, false) \
 	PO_DESC(SE.sourceCount, int, 6) \
+	PO_DESC(volume.bgs, float, 1.0f) \
+	PO_DESC(volume.se, float, 1.0f) \
 	PO_DESC(customScript, std::string, "") \
 	PO_DESC(pathCache, bool, true) \
 	PO_DESC(useScriptNames, bool, false)

src/config.h

@@ -84,6 +84,12 @@ struct Config
 		int sourceCount;
 	} SE;
 
+	struct
+	{
+		float bgs;
+		float se;
+	} volume;
+
 	bool useScriptNames;
 
 	std::string customScript;

src/soundemitter.cpp

@@ -93,7 +93,8 @@ SoundEmitter::SoundEmitter(const Config &conf)
       srcCount(conf.SE.sourceCount),
       alSrcs(srcCount),
       atchBufs(srcCount),
-      srcPrio(srcCount)
+      srcPrio(srcCount),
+      configVolume(conf.volume.se)
 {
 	for (size_t i = 0; i < srcCount; ++i)
 	{
@@ -172,7 +173,7 @@ void SoundEmitter::play(const std::string &filename,
 	if (switchBuffer)
 		AL::Source::attachBuffer(src, buffer->alBuffer);
 
-	AL::Source::setVolume(src, _volume * GLOBAL_VOLUME);
+	AL::Source::setVolume(src, _volume * configVolume * GLOBAL_VOLUME);
 	AL::Source::setPitch(src, _pitch);
 
 	AL::Source::play(src);

src/soundemitter.h

@@ -49,6 +49,9 @@ struct SoundEmitter
 	/* Indices of sources, sorted by priority (lowest first) */
 	std::vector<size_t> srcPrio;
 
+	/* Constant premultiplier */
+	float configVolume;
+
 	SoundEmitter(const Config &conf);
 	~SoundEmitter();