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diff --git a/engine/Overlay.h b/engine/Overlay.h
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+++ b/engine/Overlay.h
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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: Model loading / unloading interface
+//
+// $NoKeywords: $
+//=============================================================================//
+
+#ifndef OVERLAY_H
+#define OVERLAY_H
+
+#ifdef _WIN32
+#pragma once
+#endif
+
+
+// This is a workaround for the fact that we get massive decal flicker
+// when looking at a decal at a glancing angle while standing right next to it.
+#define OVERLAY_AVOID_FLICKER_NORMAL_OFFSET	0.1f
+
+
+//-----------------------------------------------------------------------------
+// Overlay fragments
+//-----------------------------------------------------------------------------
+typedef unsigned short OverlayFragmentHandle_t;
+
+enum
+{
+	OVERLAY_FRAGMENT_INVALID = (OverlayFragmentHandle_t)~0
+};
+
+
+//=============================================================================
+//
+// Overlay Manager Interface
+//
+class IOverlayMgr
+{
+public:
+	// Memory allocation/de-allocation.
+	virtual bool	LoadOverlays( ) = 0;
+	virtual void	UnloadOverlays( ) = 0;
+
+	virtual void	CreateFragments( void ) = 0;
+
+	virtual void	ReSortMaterials( void ) = 0;
+
+	// Drawing
+	// clears all
+	virtual void	ClearRenderLists() = 0;
+	// clears a particular sort group
+	virtual void	ClearRenderLists( int nSortGroup ) = 0;
+	virtual void	AddFragmentListToRenderList( int nSortGroup, OverlayFragmentHandle_t iFragment, bool bDisp ) = 0;
+	virtual void	RenderOverlays( int nSortGroup ) = 0;
+
+	// Sets the client renderable for an overlay's material proxy to bind to
+	virtual void	SetOverlayBindProxy( int iOverlayID, void *pBindProxy ) = 0;
+};
+
+
+//-----------------------------------------------------------------------------
+// Overlay manager singleton
+//-----------------------------------------------------------------------------
+IOverlayMgr *OverlayMgr();
+
+#endif // OVERLAY_H