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diff --git a/game/client/portal/portalrenderable_flatbasic.h b/game/client/portal/portalrenderable_flatbasic.h
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+++ b/game/client/portal/portalrenderable_flatbasic.h
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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $NoKeywords: $
+//===========================================================================//
+
+#ifndef PORTALRENDERABLE_FLATBASIC_H
+#define PORTALRENDERABLE_FLATBASIC_H
+
+#ifdef _WIN32
+#pragma once
+#endif
+
+#include "PortalRender.h"
+
+struct PortalMeshPoint_t;
+#define PORTALRENDERFIXMESH_OUTERBOUNDPLANES 12
+
+
+struct FlatBasicPortalRenderingMaterials_t
+{
+	CMaterialReference	m_PortalMaterials[2];
+	CMaterialReference	m_PortalRenderFixMaterials[2];
+	CMaterialReference	m_PortalDepthDoubler;
+	CMaterialReference	m_PortalStaticOverlay[2];
+	CMaterialReference	m_Portal_Stencil_Hole;
+	CMaterialReference	m_Portal_Refract[2];
+	//CTextureReference	m_PortalLightTransfer_ShadowTexture; //light transfers disabled indefinitely
+
+	IMaterialVar		*m_pDepthDoubleViewMatrixVar;
+};
+
+//As seen in "Portal"
+class CPortalRenderable_FlatBasic : public C_BaseAnimating, public CPortalRenderable
+{
+	DECLARE_CLASS( CPortalRenderable_FlatBasic, C_BaseAnimating );
+
+public:
+	CPortalRenderable_FlatBasic( void );
+
+	//generates a 8x6 tiled set of quads, each clipped to the view frustum. Helps vs11/ps11 portal shaders interpolate correctly. Not necessary for vs20/ps20 portal shaders or stencil mode.
+	virtual void	DrawComplexPortalMesh( const IMaterial *pMaterialOverride = NULL, float fForwardOffsetModifier = 0.25f ); 
+	
+	//generates a single quad
+	virtual void	DrawSimplePortalMesh( const IMaterial *pMaterialOverride = NULL, float fForwardOffsetModifier = 0.25f ); 
+	
+	//draws a screenspace mesh to replace missing pixels caused by the camera near plane intersecting the portal mesh
+	virtual void	DrawRenderFixMesh( const IMaterial *pMaterialOverride = NULL, float fFrontClipDistance = 0.3f ); 
+
+	//When we're in a configuration that sees through recursive portal views to a depth of 2, we should be able to cheaply approximate even further depth using pixels from previous frames
+	virtual void	DrawDepthDoublerMesh( float fForwardOffsetModifier = 0.25f ); 
+
+	virtual void	DrawPortal( void );
+
+	virtual void	DrawPreStencilMask( void ); //Draw to wherever you can see through the portal. The mask will later be filled with the portal view.
+	virtual void	DrawStencilMask( void ); //Draw to wherever you can see through the portal. The mask will later be filled with the portal view.
+	virtual void	DrawPostStencilFixes( void ); //After done drawing to the portal mask, we need to fix the depth buffer as well as fog. So draw your mesh again, writing to z and with the fog color alpha'd in by distance
+
+	virtual void	RenderPortalViewToBackBuffer( CViewRender *pViewRender, const CViewSetup &cameraView );
+	virtual void	RenderPortalViewToTexture( CViewRender *pViewRender, const CViewSetup &cameraView );
+
+	void			AddToVisAsExitPortal( ViewCustomVisibility_t *pCustomVisibility );
+
+	virtual bool	ShouldUpdatePortalView_BasedOnView( const CViewSetup &currentView, CUtlVector<VPlane> &currentComplexFrustum ); //portal is both visible, and will display at least some portion of a remote view
+	virtual bool	ShouldUpdatePortalView_BasedOnPixelVisibility( float fScreenFilledByStencilMaskLastFrame_Normalized );
+	virtual bool	ShouldUpdateDepthDoublerTexture( const CViewSetup &viewSetup );
+
+	virtual void	GetToolRecordingState( bool bActive, KeyValues *msg );
+	virtual void	HandlePortalPlaybackMessage( KeyValues *pKeyValues );
+
+	virtual const Vector &GetFogOrigin( void ) const { return m_ptOrigin; };
+	virtual SkyboxVisibility_t	SkyBoxVisibleFromPortal( void ) { return m_InternallyMaintainedData.m_nSkyboxVisibleFromCorners; };
+	virtual bool	DoesExitViewIntersectWaterPlane( float waterZ, int leafWaterDataID ) const;
+
+	bool			WillUseDepthDoublerThisDraw( void ) const; //returns true if the DrawPortal() would draw a depth doubler mesh if you were to call it right now
+
+	virtual CPortalRenderable *GetLinkedPortal() const { return m_pLinkedPortal; };
+	bool			CalcFrustumThroughPortal( const Vector &ptCurrentViewOrigin, Frustum OutputFrustum );
+
+protected:
+	void			ClipFixToBoundingAreaAndDraw( PortalMeshPoint_t *pVerts, const IMaterial *pMaterial );
+	void			Internal_DrawRenderFixMesh( const IMaterial *pMaterial );
+
+	// renders a quad that simulates fog as an overlay for something else (most notably the hole we create for stencil mode portals)
+	void			RenderFogQuad( void );
+
+	void			PortalMoved( void ); // call this if you've moved the portal around so we can update internally maintained data
+
+
+	static const FlatBasicPortalRenderingMaterials_t& m_Materials;
+	struct FlatBasicPortal_InternalData_t
+	{
+		VPlane				m_BoundingPlanes[PORTALRENDERFIXMESH_OUTERBOUNDPLANES + 2]; // +2 for front and back
+
+		VisOverrideData_t	m_VisData; // a data to use for visibility calculations (to override area portal culling)
+		int					m_iViewLeaf; // leaf to start in for area portal flowing through calculations
+
+		VMatrix				m_DepthDoublerTextureView; //cached version of view matrix at depth 1 for use when drawing the depth doubler mesh
+		bool				m_bUsableDepthDoublerConfiguration; //every time a portal moves we re-evaluate whether the depth doubler will reasonably approximate more views
+		SkyboxVisibility_t	m_nSkyboxVisibleFromCorners;
+
+		Vector				m_ptForwardOrigin;
+		Vector				m_ptCorners[4];
+
+		float				m_fPlaneDist; //combines with m_vForward to make a plane
+	};
+
+	FlatBasicPortal_InternalData_t m_InternallyMaintainedData;
+
+public:
+	CPortalRenderable_FlatBasic	*m_pLinkedPortal;
+	Vector			m_ptOrigin;
+	Vector			m_vForward, m_vUp, m_vRight;
+	float			m_fStaticAmount;
+	float			m_fSecondaryStaticAmount; // used to help kludge the end of our recursive rendering chain
+	float			m_fOpenAmount;	
+	bool			m_bIsPortal2; //for any set of portals, one must be portal 1, and the other portal 2. Uses different render targets
+};
+
+#endif //#ifndef PORTALRENDERABLE_FLATBASIC_H
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