Added FadeBackgroundMusic option

artifacts/ddraw.ini

@@ -104,6 +104,9 @@ WorldMapTerrainInfo=0
 ;Set to 0 to leave the default unchanged (i.e. 4). The maximum is 32
 NumSoundBuffers=0
 
+;Set to 1 to enable fade effects for background music when stopping and starting the playback
+FadeBackgroundMusic=1
+
 ;Set to 1 to allow attaching sound files to combat float messages
 AllowSoundForFloats=0
 

sfall/Sound.cpp

@@ -959,8 +959,11 @@ static void __declspec(naked) sfxl_init_hook() {
 
 static const int SampleRate = 44100; // 44.1kHz
 
+static bool fadeBgMusic = false;
+
 void Sound_OnAfterGameInit() {
 	*ptr_sampleRate = SampleRate / 2; // Revert to 22kHz for secondary sound buffers
+	if (fadeBgMusic) *(DWORD*)FO_VAR_gsound_background_fade = 1;
 }
 
 void Sound_Init() {
@@ -1040,6 +1043,13 @@ void Sound_Init() {
 		const DWORD sfxlInitAddr[] = {0x4A9999, 0x4A9B34};
 		HookCalls(sfxl_init_hook, sfxlInitAddr);
 	}
+
+	if (GetConfigInt("Sound", "FadeBackgroundMusic", 1)) {
+		SafeMemSet(0x45020C, CODETYPE_Nop, 6); // gsound_reset_
+		SafeWrite32(0x45212C, 250); // delay start
+		SafeWrite32(0x450ADE, 500); // delay stop
+		fadeBgMusic = true;
+	}
 }
 
 void Sound_Exit() {