Big ugly hairy hack to remove Scumm class dependencies to the MidiEmu driver, and add streaming (ahah) emulation - someone please fix this as soon as possible :)

svn-id: r4349

main.cpp

@@ -32,6 +32,9 @@ GameDetector detector;
 Gui gui;
 
 Scumm *g_scumm;
+/* FIXME */
+OSystem *g_system;
+SoundMixer *g_mixer;
 
 Config * scummcfg;
 
@@ -182,6 +185,8 @@ game settings!
 		MidiDriver *midi = detector.createMidi();
 		
 		SimonState *simon = SimonState::create(system, midi);
+		g_system = simon->_system;
+		g_mixer = &simon->_mixer[0];
 		simon->_game = detector._gameId - GID_SIMON_FIRST;
 		simon->set_volume(detector._sfx_volume);
 		simon->_game_path = detector._gameDataPath;
@@ -190,6 +195,8 @@ game settings!
 	} else {
 		Scumm *scumm = Scumm::createFromDetector(&detector, system);
 		g_scumm = scumm;
+		g_system = scumm->_system;
+		g_mixer = &scumm->_mixer[0];
 		g_scumm->_sound_volume_master = 0;
 		g_scumm->_sound_volume_music = detector._music_volume;
 		g_scumm->_sound_volume_sfx = detector._sfx_volume;

scumm.h

@@ -45,6 +45,9 @@ typedef void (Scumm::*OpcodeProc)();
 
 /* Use this one from error() ONLY */
 extern Scumm *g_scumm;
+/* BIG HACK for MidiEmu - FIXME */
+extern OSystem *g_system;
+extern SoundMixer *g_mixer;
 
 /* System Wide Constants */
 enum {

scummvm.cpp

@@ -1425,6 +1425,8 @@ Scumm *Scumm::createFromDetector(GameDetector *detector, OSystem *syst)
 
 	/* HACK !!! */
 	g_scumm = scumm;
+	g_system = scumm->_system;
+	g_mixer = &scumm->_mixer[0];
 	/* END HACK */
 
 //	scumm->_fullScreen = detector->_fullScreen;

sound/mididrv.cpp

@@ -970,6 +970,7 @@ public:
 	void send(uint32 b);
 	void pause(bool pause);
 	void set_stream_callback(void *param, StreamCallback *sc);
+	static int midiemu_callback_thread(void *param);
 	
 private:
 	struct midi_channel {
@@ -1001,9 +1002,9 @@ private:
 	StreamCallback *_stream_proc;
 	void *_stream_param;
 	int _mode;
-	FM_OPL *_opl;
 	int chp[9][3];
 	unsigned char myinsbank[128][11];
+	FM_OPL *_opl;
 	midi_channel ch[16];
 };
 
@@ -1035,8 +1036,10 @@ MidiDriver_MIDIEMU::MidiDriver_MIDIEMU(){
 }
 
 int MidiDriver_MIDIEMU::open(int mode) {
-	_opl = OPLCreate(OPL_TYPE_YM3812, 3579545, g_scumm->_system->property(OSystem::PROP_GET_SAMPLE_RATE,0));
+	_opl = OPLCreate(OPL_TYPE_YM3812, 3579545, g_system->property(OSystem::PROP_GET_SAMPLE_RATE,0));
-	g_scumm->_mixer->setup_premix((void*) this, premix_proc);
+	g_mixer->setup_premix((void*) this, premix_proc);
+	if (_stream_proc)
+		g_system->create_thread(midiemu_callback_thread, this);
 	return 0;
 }
 
@@ -1242,6 +1245,46 @@ void MidiDriver_MIDIEMU::pause(bool pause) {
 	}
 }
 
+#define NUMBER_MIDI_EVENTS 64
+
+int MidiDriver_MIDIEMU::midiemu_callback_thread(void *param) {
+	MidiDriver_MIDIEMU *driver = (MidiDriver_MIDIEMU*) param;
+	MidiEvent my_evs[NUMBER_MIDI_EVENTS];
+	bool need_midi_data = true;
+
+	for (;;) {
+		int number;
+		int i;
+
+		if (need_midi_data) {
+			number = driver->_stream_proc(driver->_stream_param, my_evs, NUMBER_MIDI_EVENTS);
+			if (!number) {
+				// No MIDI data available for the moment
+				g_system->delay_msecs(10);
+				continue;
+			}
+			need_midi_data = false;
+		}
+
+		for (i=0; i<number; i++) {
+			uint32 event;
+
+			event = my_evs[i].event;
+			if ((event>>24) == ME_TEMPO) {
+				event = (MEVT_TEMPO << 24) | (event & 0xFFFFFF);
+			}
+			driver->send(event);			
+			if (my_evs[i].delta) {
+				g_system->delay_msecs(my_evs[i].delta);
+			}
+		}
+
+		need_midi_data = true;
+	}
+
+	return 0;
+}
+
 void MidiDriver_MIDIEMU::set_stream_callback(void *param, StreamCallback *sc) {
 	_stream_param = param;
 	_stream_proc = sc;