Function midiUpdateFunc

TheForceEngine/TFE_Audio/midiPlayer.cpp:473–540

Thread Function

	// Thread Function
	int midiUpdateFunc(void* userData)
	{
		bool runThread  = true;
		bool wasPlaying = false;
		bool isPlaying  = false;
		bool isPaused = false;
		s32 loopStart = -1;
		u64 localTime = 0;
		u64 localTimeCallback = 0;
		f64 dt = 0.0;
		while (runThread)
		{
			SDL_LockMutex(s_midiThreadMutex);
						
			// Read from the command buffer.
			MidiCmd* midiCmd = s_midiCmdBuffer;
			for (u32 i = 0; i < s_midiCmdCount; i++, midiCmd++)
			{
				switch (midiCmd->cmd)
				{
					case MIDI_PAUSE:
					{
						localTimeCallback = 0;
						isPaused = true;
						stopAllNotes();
					} break;
					case MIDI_RESUME:
					{
						isPaused = false;
					} break;
					case MIDI_CHANGE_VOL:
					{
						s_masterVolume = midiCmd->newVolume;
						s_masterVolumeScaled = s_masterVolume * c_musicVolumeScale;
						changeVolume();
					} break;
					case MIDI_STOP_NOTES:
					{
						stopAllNotes();
						// Reset callback time.
						localTimeCallback = 0;
						s_midiCallback.accumulator = 0.0;
					} break;
				}
			}
			s_midiCmdCount = 0;

			// Process the midi callback, if it exists.
			if (s_midiCallback.callback && !isPaused)
			{
				s_midiCallback.accumulator += TFE_System::updateThreadLocal(&localTimeCallback);
				while (s_midiCallback.callback && s_midiCallback.accumulator >= s_midiCallback.timeStep)
				{
					s_midiCallback.callback();
					s_midiCallback.accumulator -= s_midiCallback.timeStep;
					s_curNoteTime += s_midiCallback.timeStep;
				}