Function ImUpdate

TheForceEngine/TFE_Jedi/IMuse/imuse.cpp:646–710

////////////////////////////////////////////////////// Internal "main loop" ////////////////////////////////////////////////////// Main update entry point which is called at a fixed rate (see ImGetDeltaTime). This is responsible for updating the midi players and updating digital audio playback.

	// Main update entry point which is called at a fixed rate (see ImGetDeltaTime).
	// This is responsible for updating the midi players and updating digital audio playback.
	void ImUpdate()
	{
		const s32 dtInMicrosec = ImGetDeltaTime();

		// Update Midi and Audio
		ImUpdateMidi();
		if (s_imPause)
		{
			return;
		}

		// Update faders and deferred commands that update at a rate of 60 fps.
		s_iMuseTimeInMicrosec += dtInMicrosec;
		while (s_iMuseTimeInMicrosec >= 16667)
		{
			s_iMuseTimeInMicrosec -= 16667;
			s32 prevTime = s_iMuseSystemTime;
			s_iMuseSystemTime++;	// increment the system time every 1/60th of a second.

			ImUpdateSoundFaders();
			ImHandleDeferredCommands();
		}

		// Update Group Volumes every 6 "frames".
		s_iMuseTimeLong += dtInMicrosec;
		while (s_iMuseTimeLong >= 100000)	// ~6 frames @ 60Hz
		{
			s_iMuseTimeLong -= 100000;

			s32 musicVolume = ImSetGroupVol(groupMusic, imGetValue);
			ImSoundId soundId = IM_NULL_SOUNDID;
			do
			{
				soundId = ImGetNextSound(soundId);
				if (soundId)
				{
					if (ImGetParam(soundId, soundGroup) == groupVoice)
					{
						musicVolume = (musicVolume * 82) >> imVolumeShift;
						break;
					}
				}
			} while (soundId);

			s32 dippedMusicVolume = ImSetGroupVol(groupDippedMusic, imGetValue);
			if (dippedMusicVolume > musicVolume)
			{
				dippedMusicVolume -= 6;
				if (dippedMusicVolume <= musicVolume)
				{
					dippedMusicVolume = musicVolume;
				}
				ImSetGroupVol(groupDippedMusic, dippedMusicVolume);
			}
			else if (dippedMusicVolume != musicVolume)
			{
				dippedMusicVolume += 3;
				if (dippedMusicVolume >= musicVolume)