mirror of
https://git.code.sf.net/p/quake/quakeforge
synced 2024-11-23 21:02:50 +00:00
144 lines
4.5 KiB
C
144 lines
4.5 KiB
C
/*
|
|
Copyright (C) 1996-1997 Id Software, Inc.
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software
|
|
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
|
|
See file, 'COPYING', for details.
|
|
|
|
$Id$
|
|
*/
|
|
|
|
#ifndef __QF_winding_h
|
|
#define __QF_winding_h
|
|
|
|
#include "QF/mathlib.h"
|
|
|
|
/** \defgroup winding Winding Manipulation
|
|
*/
|
|
//@{
|
|
|
|
struct plane_s;
|
|
|
|
#define ON_EPSILON 0.05
|
|
|
|
typedef struct winding_s {
|
|
int numpoints; ///< The number of points in the winding
|
|
vec3_t points[4]; ///< variable sized, never less than 3
|
|
} winding_t;
|
|
|
|
/** Create a very large four-point winding with all point on the plane.
|
|
|
|
The winding will be a box with aligned with the axes of the plane. The
|
|
order of yhe points is clockwise when viewed from the front side of
|
|
the plane.
|
|
|
|
In terms of s and t, the axes of the plane will be such that t (up) is
|
|
the projection of either the z-axis or the x-axis (whichever is
|
|
"closer"), and s is to the right (n = s cross t).
|
|
|
|
\param p The plane on which to create the winding.
|
|
\return The new winding.
|
|
\note It is the caller's responsibiltiy to free the new winding.
|
|
*/
|
|
winding_t *BaseWindingForPlane (const struct plane_s *p);
|
|
|
|
/** Create a new, empty winding with space for the specified number of points.
|
|
|
|
\param points The number of points for which to leave space.
|
|
\return The new winding.
|
|
\note It is the caller's responsibiltiy to free the new winding.
|
|
*/
|
|
winding_t *NewWinding (int points);
|
|
|
|
/** Free the winding.
|
|
|
|
\param w The winding to be freed.
|
|
*/
|
|
void FreeWinding (winding_t *w);
|
|
|
|
/** Create a new winding with the same points as the given winding.
|
|
|
|
\param w The winding to copy.
|
|
\return The new winding.
|
|
\note It is the caller's responsibiltiy to free the new winding.
|
|
*/
|
|
winding_t *CopyWinding (const winding_t *w);
|
|
|
|
/** Create a new winding with the reverse points of the given winding.
|
|
|
|
This is useful when a winding for the back side of a plane is required.
|
|
|
|
\param w The winding to copy.
|
|
\return The new winding.
|
|
\note It is the caller's responsibiltiy to free the new winding.
|
|
*/
|
|
winding_t *CopyWindingReverse (const winding_t *w);
|
|
|
|
/** Create a new "winding" that holds the unit vectors of the edges of the
|
|
given winding.
|
|
|
|
\param w The winding to convert.
|
|
\param unit If true, normalize the vectors.
|
|
\return The "winding" holding the (unit) vectors.
|
|
\note It is the caller's responsibiltiy to free the new winding.
|
|
*/
|
|
winding_t *WindingVectors (const winding_t *w, int unit);
|
|
|
|
/** Clip the winding to the plain.
|
|
|
|
The new winding will be the part of the input winding that is on the
|
|
front side of the plane.
|
|
|
|
The direction of the winding is preserved.
|
|
|
|
\note It is the caller's responsibiltiy to free the new winding.
|
|
|
|
\note The input winding will be freed.
|
|
|
|
\param in The winding to be clipped.
|
|
\param split The plane by which the winding will be clipped.
|
|
\param keepon If true, an exactly on-plane winding will be saved,
|
|
otherwise it will be clipped away.
|
|
\return The new winding representing the part of the input winding
|
|
on the font side of the plane, or NULL if the winding has
|
|
been clipped away.
|
|
*/
|
|
winding_t *ClipWinding (winding_t *in, struct plane_s *split, qboolean keepon);
|
|
|
|
/** Divide a winding by a plane, producing one or two windings.
|
|
|
|
\note The original winding is not damaged or freed.
|
|
|
|
\note If one of \a front or \a back is NULL, the other will point to
|
|
the input winding.
|
|
|
|
\note If neither \a front nor \a back are NULL, then both will be new
|
|
windings and the caller will be responsible for freeing them.
|
|
|
|
\param in The winding to be divided.
|
|
\param split The plane by which the winding will be divided.
|
|
\param front Set to the part of the input winding that is in front of
|
|
the plane, or NULL if no part of the winding is in front
|
|
of the plane.
|
|
\param back Set to the part of the input winding that is behind the
|
|
plane, or NULL if no part of the winding is behind the
|
|
plane.
|
|
*/
|
|
void DivideWinding (winding_t *in, struct plane_s *split,
|
|
winding_t **front, winding_t **back);
|
|
|
|
//@}
|
|
|
|
#endif//__QF_winding_h
|