Change the audio backend API a little

AudioBackend_SetSoundPosition was very loosely-defined.

src/Backends/Audio.h

@@ -15,8 +15,8 @@ void AudioBackend_UnlockSound(AudioBackend_Sound *sound);
 
 void AudioBackend_PlaySound(AudioBackend_Sound *sound, BOOL looping);
 void AudioBackend_StopSound(AudioBackend_Sound *sound);
+void AudioBackend_PauseSound(AudioBackend_Sound *sound);
 
 void AudioBackend_SetSoundFrequency(AudioBackend_Sound *sound, unsigned int frequency);
 void AudioBackend_SetSoundVolume(AudioBackend_Sound *sound, long volume);
 void AudioBackend_SetSoundPan(AudioBackend_Sound *sound, long pan);
-void AudioBackend_SetSoundPosition(AudioBackend_Sound *sound, size_t position);

src/Backends/Audio/SDL2.cpp

@@ -271,6 +271,19 @@ void AudioBackend_StopSound(AudioBackend_Sound *sound)
 
 	SDL_LockAudioDevice(device_id);
 
+	sound->playing = FALSE;
+	sound->position = 0.0;
+
+	SDL_UnlockAudioDevice(device_id);
+}
+
+void AudioBackend_PauseSound(AudioBackend_Sound *sound)
+{
+	if (sound == NULL)
+		return;
+
+	SDL_LockAudioDevice(device_id);
+
 	sound->playing = FALSE;
 
 	SDL_UnlockAudioDevice(device_id);
@@ -311,15 +324,3 @@ void AudioBackend_SetSoundPan(AudioBackend_Sound *sound, long pan)
 
 	SDL_UnlockAudioDevice(device_id);
 }
-
-void AudioBackend_SetSoundPosition(AudioBackend_Sound *sound, size_t position)
-{
-	if (sound == NULL)
-		return;
-
-	SDL_LockAudioDevice(device_id);
-
-	SetSoundPosition(sound, position);
-
-	SDL_UnlockAudioDevice(device_id);
-}

src/Organya.cpp

@@ -177,7 +177,6 @@ BOOL MakeSoundObject8(signed char *wavep, signed char track, signed char pipi)
 			}
 
 			AudioBackend_UnlockSound(lpORGANBUFFER[track][j][k]);
-			AudioBackend_SetSoundPosition(lpORGANBUFFER[track][j][k], 0);
 		}
 	}
 
@@ -219,10 +218,7 @@ void PlayOrganObject(unsigned char key, int mode, signed char track, long freq)
 		{
 			case 0:	// 停止 (Stop)
 				if (old_key[track] != 0xFF)
-				{
 					AudioBackend_StopSound(lpORGANBUFFER[track][old_key[track] / 12][key_twin[track]]);
-					AudioBackend_SetSoundPosition(lpORGANBUFFER[track][old_key[track] / 12][key_twin[track]], 0);
-				}
 				break;
 
 			case 1: // 再生 (Playback)
@@ -345,12 +341,10 @@ void PlayDramObject(unsigned char key, int mode, signed char track)
 		{
 			case 0:	// 停止 (Stop)
 				AudioBackend_StopSound(lpSECONDARYBUFFER[150 + track]);
-				AudioBackend_SetSoundPosition(lpSECONDARYBUFFER[150 + track], 0);
 				break;
 
 			case 1:	// 再生 (Playback)
 				AudioBackend_StopSound(lpSECONDARYBUFFER[150 + track]);
-				AudioBackend_SetSoundPosition(lpSECONDARYBUFFER[150 + track], 0);
 				ChangeDramFrequency(key, track);	// 周波数を設定して ()
 				AudioBackend_PlaySound(lpSECONDARYBUFFER[150 + track], FALSE);
 				break;

src/Sound.cpp

@@ -197,12 +197,11 @@ void PlaySoundObject(int no, int mode)
 		switch (mode)
 		{
 			case 0:	// 停止 (Stop)
-				AudioBackend_StopSound(lpSECONDARYBUFFER[no]);
+				AudioBackend_PauseSound(lpSECONDARYBUFFER[no]);
 				break;
 
 			case 1:	// 再生 (Playback)
 				AudioBackend_StopSound(lpSECONDARYBUFFER[no]);
-				AudioBackend_SetSoundPosition(lpSECONDARYBUFFER[no], 0);
 				AudioBackend_PlaySound(lpSECONDARYBUFFER[no], FALSE);
 				break;