Function CobraControl

TombEngine/Objects/TR3/Entity/tr3_cobra.cpp:58–206

	}

	void CobraControl(short itemNumber)
	{
		if (!CreatureActive(itemNumber))
			return;

		auto* item = &g_Level.Items[itemNumber];
		auto* creature = GetCreatureInfo(item);

		short angle = 0;
		short tilt = 0;
		short vertTilt = 0;

		if (item->HitPoints <= 0 && item->HitPoints != NOT_TARGETABLE)
		{
			if (item->Animation.ActiveState != COBRA_STATE_DEATH)
				SetAnimation(item, COBRA_ANIM_DEATH);
		}
		else
		{
			AI_INFO AI;
			CreatureAIInfo(item, &AI);

			AI.angle += ANGLE(16.8f);

			bool isEnemyMoving = false;
			bool isEnemyVisible = false;

			if (creature->Enemy && item->Animation.ActiveState != COBRA_STATE_SLEEP)
			{
				auto enemyPos = creature->Enemy->Pose.Position;
				enemyPos.y -= CLICK(1.5f);

				auto origin = GameVector(enemyPos, creature->Enemy->RoomNumber);
				auto target = GameVector(GetJointPosition(item, 10), item->RoomNumber); // Cobra's origin of LOS check.

				isEnemyVisible = LOS(&origin, &target);

				// A little trick to prevent Cobra jerking: after losing LOS, `EnemyIsVisible` working few more frames.
				if (isEnemyVisible)
				{
					item->ItemFlags[3] = 6;
				}
				else if (item->ItemFlags[3] > 0)
				{
					item->ItemFlags[3]--;
					isEnemyVisible = true;
				}

				if (creature->Enemy->Animation.Velocity.z > COBRA_DISTURBANCE_VELOCITY ||
					abs(creature->Enemy->Animation.Velocity.y) > COBRA_DISTURBANCE_VELOCITY)
				{
					isEnemyMoving = true;
				}

				creature->Target.x = creature->Enemy->Pose.Position.x;
				creature->Target.z = creature->Enemy->Pose.Position.z;
			}