Function FlareControl

TombEngine/Game/Lara/lara_flare.cpp:33–101

constexpr auto FLARE_DEATH_DELAY = 1.0f * FPS;

void FlareControl(short itemNumber)
{
	auto& flareItem = g_Level.Items[itemNumber];

	if (TestEnvironment(ENV_FLAG_SWAMP, &flareItem))
	{
		KillItem(itemNumber);
		return;
	}

	if (flareItem.Animation.Velocity.y)
	{
		flareItem.Pose.Orientation.x -= ANGLE(5.0f);
		flareItem.Pose.Orientation.z += ANGLE(5.0f);
	}
	else
	{
		flareItem.Pose.Orientation.x = 0;
		flareItem.Pose.Orientation.z = 0;
	}

	auto vel = Vector3i(
		flareItem.Animation.Velocity.z * phd_sin(flareItem.Pose.Orientation.y),
		flareItem.Animation.Velocity.y,
		flareItem.Animation.Velocity.z * phd_cos(flareItem.Pose.Orientation.y));

	auto prevPos = flareItem.Pose.Position;
	flareItem.Pose.Position += Vector3i(vel.x, 0, vel.z);

	if (TestEnvironment(ENV_FLAG_WATER, &flareItem) ||
		TestEnvironment(ENV_FLAG_SWAMP, &flareItem))
	{
		flareItem.Animation.Velocity.y += (5 - flareItem.Animation.Velocity.y) / 2;
		flareItem.Animation.Velocity.z += (5 - flareItem.Animation.Velocity.z) / 2;
	}
	else
	{
		flareItem.Animation.Velocity.y += g_GameFlow->GetSettings()->Physics.Gravity;
	}

	flareItem.Pose.Position.y += flareItem.Animation.Velocity.y;
	DoProjectileDynamics(itemNumber, prevPos.x, prevPos.y, prevPos.z, vel.x, vel.y, vel.z);

	const auto& settings = g_GameFlow->GetSettings()->Flare;

	int& life = flareItem.Data;
	life &= 0x7FFF;
	if (life >= (settings.Timeout * FPS))
	{
		if (flareItem.Animation.Velocity.y == 0.0f &&
			flareItem.Animation.Velocity.z == 0.0f)
		{
			KillItem(itemNumber);
			return;
		}
	}
	else
	{