From 39ed87570bdb2f86969d4be821c94b722dc71179 Mon Sep 17 00:00:00 2001
From: Joe Ludwig <joe@valvesoftware.com>
Date: Wed, 26 Jun 2013 15:22:04 -0700
Subject: First version of the SOurce SDK 2013

---
 mp/src/game/server/AI_Interest_Target.cpp | 139 ++++++++++++++++++++++++++++++
 1 file changed, 139 insertions(+)
 create mode 100644 mp/src/game/server/AI_Interest_Target.cpp

(limited to 'mp/src/game/server/AI_Interest_Target.cpp')

diff --git a/mp/src/game/server/AI_Interest_Target.cpp b/mp/src/game/server/AI_Interest_Target.cpp
new file mode 100644
index 00000000..6e08c1ce
--- /dev/null
+++ b/mp/src/game/server/AI_Interest_Target.cpp
@@ -0,0 +1,139 @@
+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: Hooks and classes for the support of humanoid NPCs with 
+//			groovy facial animation capabilities, aka, "Actors"
+//
+//=============================================================================//
+
+
+#include "cbase.h"
+#include "AI_Interest_Target.h"
+
+// memdbgon must be the last include file in a .cpp file!!!
+#include "tier0/memdbgon.h"
+
+bool CAI_InterestTarget_t::IsThis( CBaseEntity *pThis )
+{
+	return (pThis == m_hTarget);
+};
+
+const Vector &CAI_InterestTarget_t::GetPosition( void )
+{
+	if (m_eType	== LOOKAT_ENTITY && m_hTarget != NULL)
+	{
+		m_vecPosition = m_hTarget->EyePosition();
+	}
+	return m_vecPosition;
+};
+
+bool CAI_InterestTarget_t::IsActive( void )
+{
+	if (m_flEndTime < gpGlobals->curtime) return false;
+	if (m_eType == LOOKAT_ENTITY && m_hTarget == NULL) return false;
+	return true;
+};
+
+float CAI_InterestTarget_t::Interest( void )
+{
+	float t = (gpGlobals->curtime - m_flStartTime) / (m_flEndTime - m_flStartTime);
+
+	if (t < 0.0f || t > 1.0f)
+		return 0.0f;
+
+	if (m_flRamp && t < 1 - m_flRamp)
+	{
+		//t = t / m_flRamp;
+		t = 1.0 - ExponentialDecay( 0.2, m_flRamp, t );
+		//t = 1.0 - ExponentialDecay( 0.01, 1 - m_flRamp, t );
+	}
+	else if (t > 1.0f - m_flRamp)
+	{
+		t = (1.0 - t) / m_flRamp;
+		t = 3.0f * t * t - 2.0f * t * t * t;
+	} 
+	else
+	{
+		t = 1.0f;
+	}
+	// ramp
+	t *= m_flInterest;
+
+	return t;
+}
+
+
+void CAI_InterestTarget::Add( CBaseEntity *pTarget, float flImportance, float flDuration, float flRamp )
+{
+	int i;
+
+	for (i = 0; i < Count(); i++)
+	{
+		CAI_InterestTarget_t &target = Element( i );
+
+		if (target.m_hTarget == pTarget && target.m_flRamp == 0)
+		{
+			if (target.m_flStartTime == gpGlobals->curtime)
+			{
+				flImportance = MAX( flImportance, target.m_flInterest );
+			}
+			Remove( i );
+			break;
+		}
+	}
+
+	Add( CAI_InterestTarget_t::LOOKAT_ENTITY, pTarget, Vector( 0, 0, 0 ), flImportance, flDuration, flRamp );
+}
+
+void CAI_InterestTarget::Add( const Vector &vecPosition, float flImportance, float flDuration, float flRamp )
+{
+	int i;
+
+	for (i = 0; i < Count(); i++)
+	{
+		CAI_InterestTarget_t &target = Element( i );
+
+		if (target.m_vecPosition == vecPosition)
+		{
+			Remove( i );
+			break;
+		}
+	}
+
+	Add( CAI_InterestTarget_t::LOOKAT_POSITION, NULL, vecPosition, flImportance, flDuration, flRamp );
+}
+
+void CAI_InterestTarget::Add( CBaseEntity *pTarget, const Vector &vecPosition, float flImportance, float flDuration, float flRamp )
+{
+	int i;
+
+	for (i = 0; i < Count(); i++)
+	{
+		CAI_InterestTarget_t &target = Element( i );
+
+		if (target.m_hTarget == pTarget)
+		{
+			if (target.m_flStartTime == gpGlobals->curtime)
+			{
+				flImportance = MAX( flImportance, target.m_flInterest );
+			}
+			Remove( i );
+			break;
+		}
+	}
+
+	Add( CAI_InterestTarget_t::LOOKAT_BOTH, pTarget, vecPosition, flImportance, flDuration, flRamp );
+}
+
+void CAI_InterestTarget::Add( CAI_InterestTarget_t::CAI_InterestTarget_e type, CBaseEntity *pTarget, const Vector &vecPosition, float flImportance, float flDuration, float flRamp )
+{
+	int i = AddToTail();
+	CAI_InterestTarget_t &target = Element( i );
+
+	target.m_eType = type;
+	target.m_hTarget = pTarget;
+	target.m_vecPosition = vecPosition;
+	target.m_flInterest = flImportance;
+	target.m_flStartTime = gpGlobals->curtime;
+	target.m_flEndTime = gpGlobals->curtime + flDuration;
+	target.m_flRamp = flRamp / flDuration;
+}
-- 
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