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/client/c_func_tracktrain.cpp | 122 +++++++++++++++++++++++++++++++
 1 file changed, 122 insertions(+)
 create mode 100644 mp/src/game/client/c_func_tracktrain.cpp

(limited to 'mp/src/game/client/c_func_tracktrain.cpp')

diff --git a/mp/src/game/client/c_func_tracktrain.cpp b/mp/src/game/client/c_func_tracktrain.cpp
new file mode 100644
index 00000000..7a395ded
--- /dev/null
+++ b/mp/src/game/client/c_func_tracktrain.cpp
@@ -0,0 +1,122 @@
+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $NoKeywords: $
+//=============================================================================//
+
+#include "cbase.h"
+#include "c_baseentity.h"
+#include "soundinfo.h"
+
+// memdbgon must be the last include file in a .cpp file!!!
+#include "tier0/memdbgon.h"
+
+//-----------------------------------------------------------------------------
+// An entity which emits other entities at points 
+//-----------------------------------------------------------------------------
+class C_FuncTrackTrain : public C_BaseEntity
+{
+public:
+	DECLARE_CLASS( C_FuncTrackTrain, C_BaseEntity );
+	DECLARE_CLIENTCLASS();
+
+public:
+	virtual void OnDataChanged( DataUpdateType_t updateType );
+	virtual bool GetSoundSpatialization( SpatializationInfo_t& info );
+
+	virtual bool IsBaseTrain( void ) const { return true; }
+
+
+private:
+	int m_nLongAxis;
+	float m_flRadius;
+	float m_flLineLength;
+};
+
+
+//-----------------------------------------------------------------------------
+// Datatable
+//-----------------------------------------------------------------------------
+IMPLEMENT_CLIENTCLASS_DT( C_FuncTrackTrain, DT_FuncTrackTrain, CFuncTrackTrain )
+END_RECV_TABLE()
+
+
+//-----------------------------------------------------------------------------
+// Sound spatialization
+//-----------------------------------------------------------------------------
+void C_FuncTrackTrain::OnDataChanged( DataUpdateType_t updateType )
+{
+	BaseClass::OnDataChanged( updateType );
+
+	if (updateType == DATA_UPDATE_CREATED)
+	{
+		// Compute the cross-sectional area and dimension and length of the line segment
+		int nIndex1, nIndex2;
+		const Vector &vecOBBSize = CollisionProp()->OBBSize();
+		if ( ( vecOBBSize.x > vecOBBSize.y ) && ( vecOBBSize.x > vecOBBSize.z ) )
+		{
+			m_nLongAxis = 0;
+			nIndex1 = 1; nIndex2 = 2;
+		}
+		else if ( vecOBBSize.y > vecOBBSize.z )
+		{
+			m_nLongAxis = 1;
+			nIndex1 = 0; nIndex2 = 2;
+		}
+		else
+		{
+			m_nLongAxis = 2;
+			nIndex1 = 0; nIndex2 = 1;
+		}
+
+		m_flRadius = sqrt( vecOBBSize[nIndex1] * vecOBBSize[nIndex1] + vecOBBSize[nIndex2] * vecOBBSize[nIndex2] ) * 0.5f;
+		m_flLineLength = vecOBBSize[m_nLongAxis];
+	}
+}
+
+
+//-----------------------------------------------------------------------------
+// Sound spatialization
+//-----------------------------------------------------------------------------
+bool C_FuncTrackTrain::GetSoundSpatialization( SpatializationInfo_t& info )
+{
+	// Out of PVS
+	if ( IsDormant() )
+		return false;
+	
+	if ( info.pflRadius )
+	{
+		*info.pflRadius = m_flRadius;
+	}
+	
+	if ( info.pOrigin )
+	{
+		Vector vecStart, vecEnd, vecWorldDir;
+		Vector vecDir = vec3_origin;
+		vecDir[m_nLongAxis] = 1.0f;
+		VectorRotate( vecDir, EntityToWorldTransform(), vecWorldDir );
+		VectorMA( WorldSpaceCenter(), -0.5f * m_flLineLength, vecWorldDir, vecStart );
+		VectorMA( vecStart, m_flLineLength, vecWorldDir, vecEnd );
+
+		float t;
+		CalcClosestPointOnLine( info.info.vListenerOrigin, vecStart, vecEnd, *info.pOrigin, &t ); 
+		if ( t < 0.0f )
+		{
+			*info.pOrigin = vecStart;
+		}
+		else if ( t > 1.0f )
+		{
+			*info.pOrigin = vecEnd;
+		}
+	}
+
+	if ( info.pAngles )
+	{
+		VectorCopy( CollisionProp()->GetCollisionAngles(), *info.pAngles );
+	}
+
+	return true;
+}
+
+
-- 
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