Modified source engine (2017) developed by valve and leaked in 2020. Not for commercial purporses
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//========= 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;
}