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120 lines
4.8 KiB
C
Executable file
120 lines
4.8 KiB
C
Executable file
/*
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===========================================================================
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Copyright (C) 1999-2005 Id Software, Inc.
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This file is part of Quake III Arena source code.
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Quake III Arena source code is free software; you can redistribute it
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and/or modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the License,
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or (at your option) any later version.
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Quake III Arena source code is distributed in the hope that it will be
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useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Foobar; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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===========================================================================
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*/
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//a winding gives the bounding points of a convex polygon
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typedef struct
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{
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int numpoints;
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vec3_t p[4]; //variable sized
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} winding_t;
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#define MAX_POINTS_ON_WINDING 96
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//you can define on_epsilon in the makefile as tighter
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#ifndef ON_EPSILON
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#define ON_EPSILON 0.1
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#endif
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//winding errors
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#define WE_NONE 0
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#define WE_NOTENOUGHPOINTS 1
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#define WE_SMALLAREA 2
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#define WE_POINTBOGUSRANGE 3
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#define WE_POINTOFFPLANE 4
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#define WE_DEGENERATEEDGE 5
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#define WE_NONCONVEX 6
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//allocates a winding
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winding_t *AllocWinding (int points);
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//returns the area of the winding
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vec_t WindingArea (winding_t *w);
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//gives the center of the winding
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void WindingCenter (winding_t *w, vec3_t center);
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//clips the given winding to the given plane and gives the front
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//and back part of the clipped winding
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void ClipWindingEpsilon (winding_t *in, vec3_t normal, vec_t dist,
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vec_t epsilon, winding_t **front, winding_t **back);
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//returns the fragment of the given winding that is on the front
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//side of the cliping plane. The original is freed.
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winding_t *ChopWinding (winding_t *in, vec3_t normal, vec_t dist);
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//returns a copy of the given winding
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winding_t *CopyWinding (winding_t *w);
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//returns the reversed winding of the given one
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winding_t *ReverseWinding (winding_t *w);
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//returns a base winding for the given plane
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winding_t *BaseWindingForPlane (vec3_t normal, vec_t dist);
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//checks the winding for errors
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void CheckWinding (winding_t *w);
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//returns the plane normal and dist the winding is in
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void WindingPlane(winding_t *w, vec3_t normal, vec_t *dist);
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//removes colinear points from the winding
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void RemoveColinearPoints(winding_t *w);
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//returns on which side of the plane the winding is situated
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int WindingOnPlaneSide(winding_t *w, vec3_t normal, vec_t dist);
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//frees the winding
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void FreeWinding(winding_t *w);
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//gets the bounds of the winding
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void WindingBounds(winding_t *w, vec3_t mins, vec3_t maxs);
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//chops the winding with the given plane, the original winding is freed if clipped
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void ChopWindingInPlace (winding_t **w, vec3_t normal, vec_t dist, vec_t epsilon);
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//prints the winding points on STDOUT
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void pw(winding_t *w);
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//try to merge the two windings which are in the given plane
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//the original windings are undisturbed
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//the merged winding is returned when merging was possible
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//NULL is returned otherwise
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winding_t *TryMergeWinding (winding_t *f1, winding_t *f2, vec3_t planenormal);
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//brute force winding merging... creates a convex winding out of
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//the two whatsoever
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winding_t *MergeWindings(winding_t *w1, winding_t *w2, vec3_t planenormal);
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//#ifdef ME
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void ResetWindings(void);
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//returns the amount of winding memory
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int WindingMemory(void);
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int WindingPeakMemory(void);
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int ActiveWindings(void);
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//returns the winding error string
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char *WindingErrorString(void);
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//returns one of the WE_ flags when the winding has errors
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int WindingError(winding_t *w);
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//removes equal points from the winding
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void RemoveEqualPoints(winding_t *w, float epsilon);
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//returns a winding with a point added at the given spot to the
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//given winding, original winding is NOT freed
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winding_t *AddWindingPoint(winding_t *w, vec3_t point, int spot);
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//returns true if the point is on one of the winding 'edges'
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//when the point is on one of the edged the number of the first
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//point of the edge is stored in 'spot'
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int PointOnWinding(winding_t *w, vec3_t normal, float dist, vec3_t point, int *spot);
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//find a plane seperating the two windings
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//true is returned when the windings area adjacent
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//the seperating plane normal and distance area stored in 'normal' and 'dist'
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//this plane will contain both the piece of common edge of the two windings
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//and the vector 'dir'
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int FindPlaneSeperatingWindings(winding_t *w1, winding_t *w2, vec3_t dir,
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vec3_t normal, float *dist);
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//
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int WindingsNonConvex(winding_t *w1, winding_t *w2,
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vec3_t normal1, vec3_t normal2,
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float dist1, float dist2);
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//#endif //ME
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