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game/client/alphamaterialproxy.cpp

@@ -0,0 +1,62 @@
+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $NoKeywords: $
+//=============================================================================//
+#include "cbase.h"
+#include "proxyentity.h"
+#include "materialsystem/imaterial.h"
+#include "materialsystem/imaterialvar.h"
+
+// memdbgon must be the last include file in a .cpp file!!!
+#include "tier0/memdbgon.h"
+
+// $sineVar : name of variable that controls the alpha level (float)
+class CAlphaMaterialProxy : public CEntityMaterialProxy
+{
+public:
+	CAlphaMaterialProxy();
+	virtual ~CAlphaMaterialProxy();
+	virtual bool Init( IMaterial *pMaterial, KeyValues *pKeyValues );
+	virtual void OnBind( C_BaseEntity *pEntity );
+	virtual IMaterial *GetMaterial();
+
+private:
+	IMaterialVar *m_AlphaVar;
+};
+
+CAlphaMaterialProxy::CAlphaMaterialProxy()
+{
+	m_AlphaVar = NULL;
+}
+
+CAlphaMaterialProxy::~CAlphaMaterialProxy()
+{
+}
+
+
+bool CAlphaMaterialProxy::Init( IMaterial *pMaterial, KeyValues *pKeyValues )
+{
+	bool foundVar;
+	m_AlphaVar = pMaterial->FindVar( "$alpha", &foundVar, false );
+	return foundVar;
+}
+
+void CAlphaMaterialProxy::OnBind( C_BaseEntity *pEnt )
+{
+	if (m_AlphaVar)
+	{
+		m_AlphaVar->SetFloatValue( pEnt->m_clrRender->a );
+	}
+}
+
+IMaterial *CAlphaMaterialProxy::GetMaterial()
+{
+	if ( !m_AlphaVar )
+		return NULL;
+
+	return m_AlphaVar->GetOwningMaterial();
+}
+
+EXPOSE_INTERFACE( CAlphaMaterialProxy, IMaterialProxy, "Alpha" IMATERIAL_PROXY_INTERFACE_VERSION );