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utils/common/polylib.h

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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $Workfile:     $
+// $Date:         $
+//
+//-----------------------------------------------------------------------------
+// $Log: $
+//
+// $NoKeywords: $
+//=============================================================================//
+
+#ifndef POLYLIB_H
+#define POLYLIB_H
+#pragma once
+
+#ifndef MATHLIB_H
+#include "mathlib/mathlib.h"
+#endif
+
+struct winding_t
+{
+	int		numpoints;
+	Vector	*p;		// variable sized
+	int		maxpoints;
+	winding_t *next;
+};
+
+#define	MAX_POINTS_ON_WINDING	64
+
+// you can define on_epsilon in the makefile as tighter
+// point on plane side epsilon
+// todo: need a world-space epsilon, a lightmap-space epsilon, and a texture space epsilon
+// or at least convert from a world-space epsilon to lightmap and texture space epsilons
+#ifndef	ON_EPSILON
+#define	ON_EPSILON	0.1
+#endif
+
+
+winding_t	*AllocWinding (int points);
+vec_t	WindingArea (winding_t *w);
+void	WindingCenter (winding_t *w, Vector &center);
+vec_t	WindingAreaAndBalancePoint( winding_t *w, Vector &center );
+void	ClipWindingEpsilon (winding_t *in, const Vector &normal, vec_t dist, 
+				vec_t epsilon, winding_t **front, winding_t **back);
+
+// translates everything by offset, then does the clip, then translates back (to keep precision)
+void ClipWindingEpsilon_Offset( winding_t *in, const Vector &normal, vec_t dist, vec_t epsilon, winding_t **front, winding_t **back, const Vector &offset );
+
+void	ClassifyWindingEpsilon( winding_t *in, const Vector &normal, vec_t dist, 
+				vec_t epsilon, winding_t **front, winding_t **back, winding_t **on);
+void	ClassifyWindingEpsilon_Offset( winding_t *in, const Vector &normal, vec_t dist, 
+				vec_t epsilon, winding_t **front, winding_t **back, winding_t **on, const Vector &offset);
+
+winding_t	*ChopWinding (winding_t *in, const Vector &normal, vec_t dist);
+winding_t	*CopyWinding (winding_t *w);
+winding_t	*ReverseWinding (winding_t *w);
+winding_t	*BaseWindingForPlane (const Vector &normal, vec_t dist);
+void	CheckWinding (winding_t *w);
+void	WindingPlane (winding_t *w, Vector &normal, vec_t *dist);
+void	RemoveColinearPoints (winding_t *w);
+int		WindingOnPlaneSide (winding_t *w, const Vector &normal, vec_t dist);
+void	FreeWinding (winding_t *w);
+void	WindingBounds (winding_t *w, Vector &mins, Vector &maxs);
+
+void	ChopWindingInPlace (winding_t **w, const Vector &normal, vec_t dist, vec_t epsilon);
+// frees the original if clipped
+
+bool PointInWinding( Vector const &pt, winding_t *pWinding );
+
+// translates a winding by offset
+void TranslateWinding( winding_t *pWinding, const Vector &offset );
+
+void pw(winding_t *w);
+
+
+#endif // POLYLIB_H