initial

game/client/lampbeamproxy.cpp

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+//========= Copyright <20> 1996-2005, Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $NoKeywords: $
+//=============================================================================//
+#include "cbase.h"
+#include "proxyentity.h"
+#include "materialsystem/imaterialvar.h"
+#include "materialsystem/imaterial.h"
+#include "view.h"
+
+#include "imaterialproxydict.h"
+// memdbgon must be the last include file in a .cpp file!!!
+#include "tier0/memdbgon.h"
+
+//-----------------------------------------------------------------------------
+// Purpose: Used for 'card' beams on lamps, this material fades the sprite out
+// as the viewer nears, so that the viewer can't see that the effect is really
+// a card.
+//-----------------------------------------------------------------------------
+class CLampBeamProxy : public CEntityMaterialProxy
+{
+public:
+						CLampBeamProxy( void );
+	virtual				~CLampBeamProxy( void );
+	virtual bool		Init( IMaterial *pMaterial, KeyValues* pKeyValues );
+	virtual void		OnBind( C_BaseEntity *pC_BaseEntity );
+
+	virtual IMaterial *	GetMaterial();
+
+private:
+	IMaterialVar		*m_pFadeValue;
+};
+
+//-----------------------------------------------------------------------------
+// Purpose: 
+//-----------------------------------------------------------------------------
+CLampBeamProxy::CLampBeamProxy( void )
+{
+	m_pFadeValue = NULL;
+}
+
+//-----------------------------------------------------------------------------
+// Purpose: 
+//-----------------------------------------------------------------------------
+CLampBeamProxy::~CLampBeamProxy( void )
+{
+}
+
+//-----------------------------------------------------------------------------
+// Purpose: Get pointer to the color value
+// Input  : *pMaterial - 
+//-----------------------------------------------------------------------------
+bool CLampBeamProxy::Init( IMaterial *pMaterial, KeyValues* pKeyValues )
+{
+	assert( pMaterial );
+
+	// Need to get the color variable.
+	bool found;
+	m_pFadeValue = pMaterial->FindVar( "$alpha", &found );
+	pMaterial->SetMaterialVarFlag( MATERIAL_VAR_ALPHA_MODIFIED_BY_PROXY, true );
+	return found;
+}
+
+//-----------------------------------------------------------------------------
+// Purpose: 
+// Input  : *pC_BaseEntity - 
+//-----------------------------------------------------------------------------
+#define FADE_DIST	150
+
+void CLampBeamProxy::OnBind( C_BaseEntity *pEnt )
+{
+	if ( !m_pFadeValue )
+		return;
+
+	Vector vecLocal = pEnt->GetAbsOrigin() - CurrentViewOrigin();
+	VectorNormalize( vecLocal );
+
+	float fade = 1.0 - fabs( vecLocal.z );
+
+	m_pFadeValue->SetFloatValue( fade );
+}
+
+IMaterial *CLampBeamProxy::GetMaterial()
+{
+	if ( !m_pFadeValue )
+		return NULL;
+
+	return m_pFadeValue->GetOwningMaterial();
+}
+
+EXPOSE_MATERIAL_PROXY( CLampBeamProxy, lampbeam );