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game/client/tf2/ObjectBuildAlphaProxy.cpp

@@ -0,0 +1,117 @@
+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $NoKeywords: $
+//=============================================================================//
+#include "cbase.h"
+#include "proxyentity.h"
+#include "materialsystem/imaterial.h"
+#include "materialsystem/imaterialvar.h"
+#include "c_baseobject.h"
+#include <KeyValues.h>
+
+// memdbgon must be the last include file in a .cpp file!!!
+#include "tier0/memdbgon.h"
+
+//-----------------------------------------------------------------------------
+// Purpose: 
+//-----------------------------------------------------------------------------
+class CObjectBuildAlphaProxy : public CEntityMaterialProxy
+{
+public:
+	CObjectBuildAlphaProxy();
+	virtual ~CObjectBuildAlphaProxy();
+	virtual bool Init( IMaterial *pMaterial, KeyValues* pKeyValues );
+	virtual void OnBind( C_BaseEntity *pC_BaseEntity );
+
+private:
+	IMaterialVar* m_pAlphaVar;
+
+	float		buildstart;
+	float		buildend;
+};
+
+
+//-----------------------------------------------------------------------------
+// Constructor, destructor
+//-----------------------------------------------------------------------------
+
+CObjectBuildAlphaProxy::CObjectBuildAlphaProxy()
+{
+	m_pAlphaVar = 0;
+}
+
+CObjectBuildAlphaProxy::~CObjectBuildAlphaProxy()
+{
+}
+
+//-----------------------------------------------------------------------------
+// Init baby...
+//-----------------------------------------------------------------------------
+bool CObjectBuildAlphaProxy::Init( IMaterial *pMaterial, KeyValues* pKeyValues )
+{
+
+	bool foundVar;
+	m_pAlphaVar = pMaterial->FindVar( "$alpha", &foundVar, false );
+	if( !foundVar )
+	{
+		m_pAlphaVar = 0;
+	}
+
+	buildstart = pKeyValues->GetFloat( "buildstart", 1.0f );
+	buildend = pKeyValues->GetFloat( "buildfinish", 1.0f );
+
+	return true;
+}
+
+
+//-----------------------------------------------------------------------------
+// Set the appropriate texture...
+//-----------------------------------------------------------------------------
+void CObjectBuildAlphaProxy::OnBind( C_BaseEntity *pEntity )
+{
+	if( !m_pAlphaVar )
+		return;
+	
+	// It needs to be a TF2 C_BaseObject to have this proxy applied
+	C_BaseObject *pObject = dynamic_cast< C_BaseObject * >( pEntity );
+	if ( !pObject )
+		return;
+
+	float build_amount = pObject->GetCycle(); //pObject->GetPercentageConstructed();
+	float frac;
+
+	if ( build_amount <= buildstart )
+	{
+		frac = 0.0f;
+	}
+	else if ( build_amount >= buildend )
+	{
+		frac = 1.0f;
+	}
+	else
+	{
+		// Avoid div by zero
+		if ( buildend == buildstart )
+		{
+			frac = 1.0f;
+		}
+		else
+		{
+			frac = ( build_amount - buildstart ) / ( buildend - buildstart );
+			frac = clamp( frac, 0.0f, 1.0f );
+		}
+	}
+
+	if ( !pObject->IsBuilding() )
+	{
+		frac = 1.0f;
+	}
+
+	m_pAlphaVar->SetFloatValue( frac );
+}
+
+EXPOSE_INTERFACE( CObjectBuildAlphaProxy, IMaterialProxy, "TFObjectBuildAlpha" IMATERIAL_PROXY_INTERFACE_VERSION );
+
+