Audio: Make cheap OpenAL pitch shifting a config option

src/audio.cpp

@@ -26,6 +26,7 @@
 #include "intrulist.h"
 #include "filesystem.h"
 #include "exception.h"
+#include "config.h"
 #include "al-util.h"
 
 #include <QByteArray>
@@ -300,7 +301,8 @@ struct SoundEmitter
 		AL::Source::setVolume(src, _volume);
 
 #ifndef RUBBERBAND
-		AL::Source::setPitch(src, clamp<int>(pitch, 50, 150) / 100.f);
+		if (shState->config().fastSoundPitch)
+			AL::Source::setPitch(src, clamp<int>(pitch, 50, 150) / 100.f);
 #endif
 
 		AL::Source::play(src);
@@ -761,7 +763,8 @@ private:
 		needsRewind = false;
 
 #ifndef RUBBERBAND
-		AL::Source::setPitch(alSrc, pitch);
+		if (shState->config().fastMusicPitch)
+			AL::Source::setPitch(alSrc, pitch);
 #endif
 	}
 

src/config.cpp

@@ -39,6 +39,8 @@ Config::Config()
       defScreenH(480),
       fixedFramerate(0),
       solidFonts(false),
+      fastSoundPitch(true),
+      fastMusicPitch(false),
       gameFolder("."),
       allowSymlinks(false)
 {}
@@ -59,6 +61,8 @@ void Config::read()
 	READ_VAL(defScreenH, Int);
 	READ_VAL(fixedFramerate, Int);
 	READ_VAL(solidFonts,  Bool);
+	READ_VAL(fastSoundPitch, Bool);
+	READ_VAL(fastMusicPitch, Bool);
 	READ_VAL(gameFolder, ByteArray);
 	READ_VAL(allowSymlinks, Bool);
 	READ_VAL(customScript, ByteArray);

src/config.h

@@ -44,6 +44,9 @@ struct Config
 
 	bool solidFonts;
 
+	bool fastSoundPitch;
+	bool fastMusicPitch;
+
 	QByteArray gameFolder;
 	bool allowSymlinks;