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game/server/ai_moveshoot.cpp

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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// To give an NPC the ability to shoot while moving:
+//
+// - In the NPC's Spawn function, add:
+//		CapabilitiesAdd( bits_CAP_MOVE_SHOOT );
+//
+// - The NPC must either have a weapon (return non-NULL from GetActiveWeapon)
+//	  or must have bits_CAP_INNATE_RANGE_ATTACK1 or bits_CAP_INNATE_RANGE_ATTACK2.
+//
+// - Support the activities ACT_WALK_AIM and/or ACT_RUN_AIM in the NPC.
+//
+// - Support the activity ACT_GESTURE_RANGE_ATTACK1 as a gesture that plays
+//	 over ACT_WALK_AIM and ACT_RUN_AIM.
+//
+//=============================================================================
+
+#include "cbase.h"
+
+#include "ai_moveshoot.h"
+#include "ai_basenpc.h"
+#include "ai_navigator.h"
+#include "ai_memory.h"
+
+// memdbgon must be the last include file in a .cpp file!!!
+#include "tier0/memdbgon.h"
+
+//-----------------------------------------------------------------------------
+
+BEGIN_SIMPLE_DATADESC( CAI_MoveAndShootOverlay )
+	DEFINE_FIELD( m_bMovingAndShooting, FIELD_BOOLEAN ),
+	DEFINE_FIELD( m_bNoShootWhileMove, FIELD_BOOLEAN ),
+	DEFINE_FIELD( m_initialDelay, FIELD_FLOAT ),
+	DEFINE_FIELD( m_flSuspendUntilTime, FIELD_TIME ),
+END_DATADESC()
+
+#define MOVESHOOT_DO_NOT_SUSPEND	-1.0f
+
+//-------------------------------------
+
+CAI_MoveAndShootOverlay::CAI_MoveAndShootOverlay() : m_bMovingAndShooting(false), m_initialDelay(0)
+{
+	m_flSuspendUntilTime = MOVESHOOT_DO_NOT_SUSPEND;
+	m_bNoShootWhileMove = false;
+}
+
+//-------------------------------------
+
+void CAI_MoveAndShootOverlay::NoShootWhileMove()
+{
+	m_bNoShootWhileMove = true;
+}
+
+//-------------------------------------
+
+bool CAI_MoveAndShootOverlay::HasAvailableRangeAttack()
+{
+	return ( ( GetOuter()->GetActiveWeapon() != NULL ) ||
+			( GetOuter()->CapabilitiesGet() & bits_CAP_INNATE_RANGE_ATTACK1 ) ||
+			( GetOuter()->CapabilitiesGet() & bits_CAP_INNATE_RANGE_ATTACK2 ) );
+}
+
+//-------------------------------------
+
+void CAI_MoveAndShootOverlay::StartShootWhileMove()
+{
+	if ( GetOuter()->GetState() == NPC_STATE_SCRIPT || 
+		 !HasAvailableRangeAttack() ||
+		 !GetOuter()->HaveSequenceForActivity( GetOuter()->TranslateActivity( ACT_WALK_AIM ) ) ||
+		 !GetOuter()->HaveSequenceForActivity( GetOuter()->TranslateActivity( ACT_RUN_AIM ) ) )
+	{
+		NoShootWhileMove();
+		return;
+	}
+	
+	GetOuter()->GetShotRegulator()->FireNoEarlierThan( gpGlobals->curtime + m_initialDelay );
+	m_bNoShootWhileMove = false;
+}
+
+//-------------------------------------
+
+bool CAI_MoveAndShootOverlay::CanAimAtEnemy()
+{
+	CAI_BaseNPC *pOuter = GetOuter();
+	bool result = false;
+	bool resetConditions = false;
+	CAI_ScheduleBits savedConditions;
+
+	if ( !GetOuter()->ConditionsGathered() )
+	{
+		savedConditions = GetOuter()->AccessConditionBits();
+		GetOuter()->GatherEnemyConditions( GetOuter()->GetEnemy() );
+	}
+	
+	if ( pOuter->HasCondition( COND_CAN_RANGE_ATTACK1 ) )
+	{
+		result = true;
+	}
+	else if ( !pOuter->HasCondition( COND_ENEMY_DEAD ) &&
+			  !pOuter->HasCondition( COND_TOO_FAR_TO_ATTACK ) &&
+			  !pOuter->HasCondition( COND_ENEMY_TOO_FAR ) &&
+			  !pOuter->HasCondition( COND_ENEMY_OCCLUDED ) )
+	{
+		result = true;
+	}
+
+	// If we don't have a weapon, stop
+	// This catches NPCs who holster their weapons while running
+	if ( !HasAvailableRangeAttack() )
+	{
+		result = false;
+	}
+
+	if ( resetConditions )
+	{
+		GetOuter()->AccessConditionBits() = savedConditions;
+	}
+		
+	return result;
+}
+
+//-------------------------------------
+
+void CAI_MoveAndShootOverlay::UpdateMoveShootActivity( bool bMoveAimAtEnemy )
+{
+	// FIXME: should be able to query that transition/state is happening
+	// FIXME: needs to not try to shoot if the movement type isn't understood
+	Activity curActivity = GetOuter()->GetNavigator()->GetMovementActivity();
+	Activity newActivity = curActivity;
+
+	if (bMoveAimAtEnemy)
+	{
+		switch( curActivity )
+		{
+		case ACT_WALK:
+			newActivity = ACT_WALK_AIM;
+			break;
+		case ACT_RUN:
+			newActivity = ACT_RUN_AIM;
+			break;
+		}
+	}
+	else
+	{
+		switch( curActivity )
+		{
+		case ACT_WALK_AIM:
+			newActivity = ACT_WALK;
+			break;
+		case ACT_RUN_AIM:
+			newActivity = ACT_RUN;
+			break;
+		}
+	}
+
+	if ( curActivity != newActivity )
+	{
+		// Transitioning, wait a bit
+		GetOuter()->GetShotRegulator()->FireNoEarlierThan( gpGlobals->curtime + 0.3f );
+		GetOuter()->GetNavigator()->SetMovementActivity( newActivity );
+	}
+}
+
+//-------------------------------------
+
+void CAI_MoveAndShootOverlay::RunShootWhileMove()
+{
+	if ( m_bNoShootWhileMove )
+		return;
+
+	if ( gpGlobals->curtime < m_flSuspendUntilTime )
+		return;
+
+	m_flSuspendUntilTime = MOVESHOOT_DO_NOT_SUSPEND;
+
+	CAI_BaseNPC *pOuter = GetOuter();
+
+	// keep enemy if dead but try to look for a new one
+	if (!pOuter->GetEnemy() || !pOuter->GetEnemy()->IsAlive())
+	{
+		CBaseEntity *pNewEnemy = pOuter->BestEnemy();
+
+		if( pNewEnemy != NULL )
+		{
+			//New enemy! Clear the timers and set conditions.
+			pOuter->SetEnemy( pNewEnemy );
+			pOuter->SetState( NPC_STATE_COMBAT );
+		}
+		else
+		{
+			pOuter->ClearAttackConditions();
+		}
+		// SetEnemy( NULL );
+	}
+
+	if( !pOuter->GetNavigator()->IsGoalActive() )
+		return;
+
+	if ( GetEnemy() == NULL )
+	{
+		if ( pOuter->GetAlternateMoveShootTarget() )
+		{
+			// Aim at this other thing if I can't aim at my enemy.
+			pOuter->AddFacingTarget( pOuter->GetAlternateMoveShootTarget(), pOuter->GetAlternateMoveShootTarget()->GetAbsOrigin(), 1.0, 0.2 );
+		}
+
+		return;
+	}
+
+	bool bMoveAimAtEnemy = CanAimAtEnemy();
+	UpdateMoveShootActivity( bMoveAimAtEnemy );
+	if ( !bMoveAimAtEnemy )
+	{
+		EndShootWhileMove();
+		return;
+	}
+
+	Assert( HasAvailableRangeAttack() ); // This should have been caught at task start
+
+	Activity activity;
+	bool bIsReloading = false;
+
+	if ( ( activity = pOuter->TranslateActivity( ACT_GESTURE_RELOAD ) ) != ACT_INVALID )
+	{
+		bIsReloading = pOuter->IsPlayingGesture( activity );
+	}
+
+	if ( !bIsReloading && HasAvailableRangeAttack() )
+	{
+		// time to fire?
+		if ( pOuter->HasCondition( COND_CAN_RANGE_ATTACK1, false ) )
+		{
+			if ( pOuter->GetShotRegulator()->IsInRestInterval() )
+			{
+				EndShootWhileMove();
+			}
+			else if ( pOuter->GetShotRegulator()->ShouldShoot() )
+			{
+				if ( m_bMovingAndShooting || pOuter->OnBeginMoveAndShoot() )
+				{
+					m_bMovingAndShooting = true;
+					pOuter->OnRangeAttack1();
+
+					activity = pOuter->TranslateActivity( ACT_GESTURE_RANGE_ATTACK1 );
+					Assert( activity != ACT_INVALID );
+
+					pOuter->RestartGesture( activity );
+
+					// FIXME: this seems a bit wacked
+					pOuter->Weapon_SetActivity( pOuter->Weapon_TranslateActivity( ACT_RANGE_ATTACK1 ), 0 );
+				}
+			}
+		}
+		else if ( pOuter->HasCondition( COND_NO_PRIMARY_AMMO, false ) )
+		{
+			if ( pOuter->GetNavigator()->GetPathTimeToGoal() > 1.0 )
+			{
+				activity = pOuter->TranslateActivity( ACT_GESTURE_RELOAD );
+				if ( activity != ACT_INVALID && GetOuter()->HaveSequenceForActivity( activity ) )
+					pOuter->AddGesture( activity );
+			}
+		}
+	}
+
+	// try to keep facing towards the last known position of the enemy
+	Vector vecEnemyLKP = pOuter->GetEnemyLKP();
+	pOuter->AddFacingTarget( pOuter->GetEnemy(), vecEnemyLKP, 1.0, 0.8 );
+}
+
+
+//-------------------------------------
+
+void CAI_MoveAndShootOverlay::EndShootWhileMove()
+{
+	if ( m_bMovingAndShooting )
+	{
+		// Reset the shot regulator so that we always start the next motion with a new burst
+		if ( !GetOuter()->GetShotRegulator()->IsInRestInterval() )
+		{
+			GetOuter()->GetShotRegulator()->Reset( false );
+		}
+
+		m_bMovingAndShooting = false;
+		GetOuter()->OnEndMoveAndShoot();
+	}
+}
+
+//-------------------------------------
+
+void CAI_MoveAndShootOverlay::SuspendMoveAndShoot( float flDuration )
+{
+	EndShootWhileMove();
+	m_flSuspendUntilTime = gpGlobals->curtime + flDuration;
+}
+
+//-------------------------------------
+
+void CAI_MoveAndShootOverlay::SetInitialDelay( float delay )
+{
+	m_initialDelay = delay;
+}
+
+//-----------------------------------------------------------------------------