Function EarthquakeControl

TombEngine/Objects/Generic/Object/objects.cpp:280–343

}

void EarthquakeControl(short itemNumber)
{
	auto& item = g_Level.Items[itemNumber];

	if (!TriggerActive(&item))
		return;

	if (item.TriggerFlags)
	{
		// OCB 333 and 888 are legacy modes for TR4 compatibility.
		// Any other positive OCB value triggers an earthquake for specified amount of seconds.
		// Any negative OCB value triggers a rumble sound effect for specified amount of seconds.

		bool legacyMode888 = (item.TriggerFlags == 888);
		bool legacyMode333 = (item.TriggerFlags == 333);

		int timeout = (legacyMode888 ? 5 : (legacyMode333 ? 16 : abs(item.TriggerFlags))) * FPS;
		float volume = std::clamp((float)(timeout - item.ItemFlags[0]) / (float)FPS, 0.01f, 1.0f); // Fadeout for the last second.

		if (!legacyMode333 && item.TriggerFlags > 0)
			Camera.bounce = -64 - (GetRandomControl() & 0x1F);

		SoundEffect(SFX_TR4_EARTHQUAKE_LOOP, nullptr, SoundEnvironment::Always, 1.0f, volume);

		item.ItemFlags[0]++;

		if (item.ItemFlags[0] >= timeout)
			KillItem(itemNumber);
	}
	else
	{
		if (!item.ItemFlags[1])
			item.ItemFlags[1] = 100;

		if (!item.ItemFlags[2])
		{
			if (abs(item.ItemFlags[0] - item.ItemFlags[1]) < 16)
			{
				if (item.ItemFlags[1] == 20)
				{
					item.ItemFlags[1] = 100;
					item.ItemFlags[2] = (GetRandomControl() & 0x7F) + 90;
				}
				else
				{
					item.ItemFlags[1] = 20;
					item.ItemFlags[2] = (GetRandomControl() & 0x7F) + 30;
				}
			}
		}

		if (item.ItemFlags[2])
			item.ItemFlags[2]--;

		if (item.ItemFlags[0] <= item.ItemFlags[1])
			item.ItemFlags[0] += (GetRandomControl() & 7) + 2;
		else
			item.ItemFlags[0] -= (GetRandomControl() & 7) + 2;