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diff --git a/engine/r_areaportal.h b/engine/r_areaportal.h
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+++ b/engine/r_areaportal.h
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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $NoKeywords: $
+//=============================================================================//
+
+#ifndef R_AREAPORTAL_H
+#define R_AREAPORTAL_H
+#ifdef _WIN32
+#pragma once
+#endif
+
+
+#include "utlvector.h"
+#include "gl_model_private.h"
+
+
+class Frustum_t;
+
+
+// Used to clip area portals. The coordinates here are in normalized
+// view space (-1,-1) - (1,1)
+// BUGBUG: NOTE!!!: These are left->right, and bottom->top, so a full rect is left=-1,top=1,right=1,bottom=-1
+class CPortalRect
+{
+public:
+	float	left, top, right, bottom;
+};
+
+
+// ---------------------------------------------------------------------------- //
+// Functions.
+// ---------------------------------------------------------------------------- //
+
+// Copies cl.pAreaBits, finds the area the viewer is in, and figures out what
+// other areas are visible. The new bits are placed in g_RenderAreaBits.
+void R_SetupAreaBits( int iForceViewLeaf = -1, const VisOverrideData_t* pVisData = NULL, float *pWaterReflectionHeight = NULL );
+
+// Ask if an area is visible to the renderer.
+unsigned char R_IsAreaVisible( int area );
+
+void R_Areaportal_LevelInit();
+void R_Areaportal_LevelShutdown();
+
+// Decides if the node can be seen through the area portals (ie: if you're
+// looking out a window with an areaportal in it, this will clip out the
+// stuff to the sides).
+enum
+{
+	FRUSTUM_CLIP_RIGHT = (1 << FRUSTUM_RIGHT),
+	FRUSTUM_CLIP_LEFT = (1 << FRUSTUM_LEFT),
+	FRUSTUM_CLIP_TOP = (1 << FRUSTUM_TOP),
+	FRUSTUM_CLIP_BOTTOM = (1 << FRUSTUM_BOTTOM),
+
+	FRUSTUM_CLIP_MASK = FRUSTUM_CLIP_RIGHT | FRUSTUM_CLIP_LEFT | FRUSTUM_CLIP_TOP | FRUSTUM_CLIP_BOTTOM,
+
+	// This mask is used to reset the clip flags when we first enter an area
+	FRUSTUM_CLIP_IN_AREA = 0x80000000,
+
+	// Set the clipmask to this to cause it to clip against all frustum planes
+	FRUSTUM_CLIP_ALL = FRUSTUM_CLIP_MASK,
+
+	// Set the clipmask to this to suppress all future clipping
+	FRUSTUM_SUPPRESS_CLIPPING = FRUSTUM_CLIP_IN_AREA,
+};
+
+
+bool R_CullNode( Frustum_t *pAreaFrustum, mnode_t *pNode, int &nClipMask );
+
+const Frustum_t* GetAreaFrustum( int area );
+
+
+// ---------------------------------------------------------------------------- //
+// Globals.
+// ---------------------------------------------------------------------------- //
+
+extern ConVar r_DrawPortals;
+
+// Used when r_DrawPortals is on. Draws the screen space rects for each portal.
+extern CUtlVector<CPortalRect> g_PortalRects;
+
+
+
+// ---------------------------------------------------------------------------- //
+// Inlines.
+// ---------------------------------------------------------------------------- //
+
+inline unsigned char R_IsAreaVisible( int area )
+{
+	extern unsigned char g_RenderAreaBits[32];
+	return g_RenderAreaBits[area>>3] & (1 << (area&7));
+}
+
+
+#endif // R_AREAPORTAL_H