DoomRTX/neo/doom3/game/bots/BotAI_Battle_Fight.cpp

// BotAI_Battle_Fight.cpp
//

#pragma hdrstop
#include "precompiled.h"
#include "../Game_local.h"

/*
=====================
rvmBot::state_BattleFight
=====================
*/
stateResult_t rvmBot::state_BattleFight(stateParms_t* parms)
{
	idVec3 target;
	idPlayer* entinfo;

	// respawn if dead.
	if( BotIsDead( &bs ) )
	{
		stateThread.SetState("state_Respawn");
		return SRESULT_DONE_FRAME;
	}

	//if there is another better enemy
	if( BotFindEnemy( &bs, bs.enemy ) )
	{
		common->DPrintf( "found new better enemy\n" );
	}

	//if no enemy
	if( bs.enemy < 0 || bs.enemy >= gameLocal.num_entities || gameLocal.entities[bs.enemy] == NULL )
	{
		stateThread.SetState("state_SeekLTG");
		return SRESULT_DONE_FRAME;
	}

	entinfo = gameLocal.entities[bs.enemy]->Cast<idPlayer>();
	if( entinfo == NULL )
	{
		stateThread.SetState("state_SeekLTG");
		return SRESULT_DONE_FRAME;
	}

	//if the enemy is dead
	if( bs.enemydeath_time )
	{
		if( bs.enemydeath_time < Bot_Time() - 1.0 )
		{
			bs.enemydeath_time = 0;
			bs.ltg_time = 0;
			stateThread.SetState("state_SeekLTG");
			return SRESULT_DONE_FRAME;
		}
	}
	else if( EntityIsDead( entinfo ) )
	{
		bs.enemydeath_time = Bot_Time();
	}

	target = entinfo->GetOrigin();

	//update the attack inventory values
	BotUpdateBattleInventory( &bs, bs.enemy );

	//if the enemy is not visible
	if( !BotEntityVisible( bs.entitynum, bs.eye, bs.viewangles, 360, bs.enemy ) )
	{
		if( BotWantsToChase( &bs ) )
		{
			bs.chase_time = Bot_Time() + 10.0f;
			stateThread.SetState("state_Chase");
			return SRESULT_DONE_FRAME;
		}
		else
		{
			stateThread.SetState("state_SeekLTG");
			return SRESULT_DONE_FRAME;
		}
	}

	bs.enemyvisible_time = Bot_Time();
	bs.lastenemyorigin = target;
	bs.last_enemy_visible_position = target;

	//use holdable items
	BotBattleUseItems( &bs );

	//choose the best weapon to fight with
	BotChooseWeapon( &bs );

	// Opportunistic combat pickup: keep fighting, but route through a nearby item
	// instead of throwing the current goal away and random-strafing forever.  The
	// NBG selector itself expands this range when the bot is stuck on pistol/dry
	// ammo, and otherwise keeps the detour short.
	if( bs.check_time < Bot_Time() )
	{
		bs.check_time = Bot_Time() + 0.45f;

		bot_goal_t pickupAnchor;
		pickupAnchor.Reset();
		pickupAnchor.entitynum = bs.enemy;
		pickupAnchor.origin = target;
		pickupAnchor.mins = idVec3( -8.0f, -8.0f, -8.0f );
		pickupAnchor.maxs = idVec3( 8.0f, 8.0f, 8.0f );

		const float pickupRange = 260.0f;
		if( BotNearbyGoal( &bs, 0, &pickupAnchor, pickupRange ) )
		{
			bs.nbg_time = Bot_Time() + 18.0f;
			stateThread.SetState("state_BattleNBG");
			return SRESULT_DONE_FRAME;
		}
	}

	// Fight like a deathmatch bot: keep pressure on the enemy while changing
	// strafe direction often enough to be hard to track.
	if( bs.attackstrafe_time < Bot_Time() )
	{
		bs.attackstrafe_time = Bot_Time() + idMath::FRandRange( 0.65f, 1.35f );
		if( rvmBotUtil::random() < 0.5f )
		{
			bs.flags ^= BFL_STRAFERIGHT;
		}
	}

	idVec3 toEnemy = target - bs.origin;
	toEnemy[2] = 0.0f;
	const float enemyDist = toEnemy.Length();
	if( enemyDist > 1.0f )
	{
		toEnemy /= enemyDist;
		idVec3 strafeDir = ( bs.flags & BFL_STRAFERIGHT ) ? idVec3( -toEnemy[1], toEnemy[0], 0.0f ) : idVec3( toEnemy[1], -toEnemy[0], 0.0f );
		idVec3 moveDir = strafeDir;

		if( enemyDist > 520.0f )
		{
			moveDir += toEnemy * 0.65f;
		}
		else if( enemyDist < 170.0f )
		{
			moveDir -= toEnemy * 0.75f;
		}

		moveDir.Normalize();
		bs.botinput.dir = moveDir;
		bs.botinput.speed = pm_runspeed.GetInteger();

		if( enemyDist < 420.0f && rvmBotUtil::random() < 0.025f )
		{
			bs.botinput.actionflags |= ACTION_JUMP;
		}
	}
	else
	{
		BotMoveInRandomDirection(&bs);
	}

	//aim at the enemy
	BotAimAtEnemy( &bs );

	//attack the enemy if possible
	BotCheckAttack( &bs );	

	//if the bot wants to retreat
	if( !( bs.flags & BFL_FIGHTSUICIDAL ) )
	{
		if( BotWantsToRetreat( &bs ) )
		{
			stateThread.SetState("state_Retreat");
			return SRESULT_DONE_FRAME;
		}
	}

	return SRESULT_WAIT;
}