mirror of
https://github.com/DrBeef/ioq3quest.git
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740 lines
14 KiB
C
740 lines
14 KiB
C
/*
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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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#include "cmdlib.h"
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#include "mathlib.h"
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#include "polylib.h"
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#include "qfiles.h"
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extern int numthreads;
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// counters are only bumped when running single threaded,
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// because they are an awefull coherence problem
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int c_active_windings;
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int c_peak_windings;
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int c_winding_allocs;
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int c_winding_points;
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#define BOGUS_RANGE WORLD_SIZE
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void pw(winding_t *w)
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{
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int i;
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for (i=0 ; i<w->numpoints ; i++)
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printf ("(%5.1f, %5.1f, %5.1f)\n",w->p[i][0], w->p[i][1],w->p[i][2]);
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}
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/*
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=============
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AllocWinding
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=============
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*/
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winding_t *AllocWinding (int points)
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{
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winding_t *w;
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int s;
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if (numthreads == 1)
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{
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c_winding_allocs++;
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c_winding_points += points;
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c_active_windings++;
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if (c_active_windings > c_peak_windings)
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c_peak_windings = c_active_windings;
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}
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s = sizeof(vec_t)*3*points + sizeof(int);
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w = malloc (s);
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memset (w, 0, s);
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return w;
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}
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void FreeWinding (winding_t *w)
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{
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if (*(unsigned *)w == 0xdeaddead)
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Error ("FreeWinding: freed a freed winding");
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*(unsigned *)w = 0xdeaddead;
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if (numthreads == 1)
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c_active_windings--;
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free (w);
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}
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/*
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============
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RemoveColinearPoints
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============
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*/
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int c_removed;
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void RemoveColinearPoints (winding_t *w)
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{
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int i, j, k;
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vec3_t v1, v2;
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int nump;
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vec3_t p[MAX_POINTS_ON_WINDING];
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nump = 0;
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for (i=0 ; i<w->numpoints ; i++)
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{
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j = (i+1)%w->numpoints;
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k = (i+w->numpoints-1)%w->numpoints;
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VectorSubtract (w->p[j], w->p[i], v1);
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VectorSubtract (w->p[i], w->p[k], v2);
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VectorNormalize(v1,v1);
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VectorNormalize(v2,v2);
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if (DotProduct(v1, v2) < 0.999)
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{
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VectorCopy (w->p[i], p[nump]);
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nump++;
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}
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}
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if (nump == w->numpoints)
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return;
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if (numthreads == 1)
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c_removed += w->numpoints - nump;
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w->numpoints = nump;
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memcpy (w->p, p, nump*sizeof(p[0]));
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}
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/*
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============
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WindingPlane
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============
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*/
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void WindingPlane (winding_t *w, vec3_t normal, vec_t *dist)
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{
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vec3_t v1, v2;
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VectorSubtract (w->p[1], w->p[0], v1);
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VectorSubtract (w->p[2], w->p[0], v2);
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CrossProduct (v2, v1, normal);
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VectorNormalize (normal, normal);
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*dist = DotProduct (w->p[0], normal);
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}
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/*
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=============
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WindingArea
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=============
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*/
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vec_t WindingArea (winding_t *w)
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{
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int i;
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vec3_t d1, d2, cross;
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vec_t total;
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total = 0;
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for (i=2 ; i<w->numpoints ; i++)
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{
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VectorSubtract (w->p[i-1], w->p[0], d1);
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VectorSubtract (w->p[i], w->p[0], d2);
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CrossProduct (d1, d2, cross);
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total += 0.5 * VectorLength ( cross );
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}
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return total;
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}
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void WindingBounds (winding_t *w, vec3_t mins, vec3_t maxs)
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{
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vec_t v;
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int i,j;
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mins[0] = mins[1] = mins[2] = 99999;
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maxs[0] = maxs[1] = maxs[2] = -99999;
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for (i=0 ; i<w->numpoints ; i++)
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{
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for (j=0 ; j<3 ; j++)
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{
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v = w->p[i][j];
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if (v < mins[j])
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mins[j] = v;
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if (v > maxs[j])
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maxs[j] = v;
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}
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}
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}
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/*
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=============
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WindingCenter
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=============
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*/
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void WindingCenter (winding_t *w, vec3_t center)
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{
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int i;
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float scale;
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VectorCopy (vec3_origin, center);
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for (i=0 ; i<w->numpoints ; i++)
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VectorAdd (w->p[i], center, center);
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scale = 1.0/w->numpoints;
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VectorScale (center, scale, center);
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}
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/*
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=================
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BaseWindingForPlane
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=================
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*/
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winding_t *BaseWindingForPlane (vec3_t normal, vec_t dist)
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{
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int i, x;
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vec_t max, v;
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vec3_t org, vright, vup;
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winding_t *w;
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// find the major axis
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max = -BOGUS_RANGE;
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x = -1;
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for (i=0 ; i<3; i++)
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{
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v = fabs(normal[i]);
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if (v > max)
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{
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x = i;
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max = v;
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}
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}
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if (x==-1)
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Error ("BaseWindingForPlane: no axis found");
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VectorCopy (vec3_origin, vup);
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switch (x)
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{
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case 0:
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case 1:
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vup[2] = 1;
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break;
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case 2:
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vup[0] = 1;
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break;
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}
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v = DotProduct (vup, normal);
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VectorMA (vup, -v, normal, vup);
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VectorNormalize (vup, vup);
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VectorScale (normal, dist, org);
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CrossProduct (vup, normal, vright);
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VectorScale (vup, MAX_WORLD_COORD, vup);
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VectorScale (vright, MAX_WORLD_COORD, vright);
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// project a really big axis aligned box onto the plane
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w = AllocWinding (4);
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VectorSubtract (org, vright, w->p[0]);
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VectorAdd (w->p[0], vup, w->p[0]);
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VectorAdd (org, vright, w->p[1]);
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VectorAdd (w->p[1], vup, w->p[1]);
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VectorAdd (org, vright, w->p[2]);
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VectorSubtract (w->p[2], vup, w->p[2]);
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VectorSubtract (org, vright, w->p[3]);
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VectorSubtract (w->p[3], vup, w->p[3]);
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w->numpoints = 4;
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return w;
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}
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/*
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==================
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CopyWinding
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==================
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*/
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winding_t *CopyWinding (winding_t *w)
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{
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int size;
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winding_t *c;
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c = AllocWinding (w->numpoints);
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size = (int)((winding_t *)0)->p[w->numpoints];
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memcpy (c, w, size);
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return c;
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}
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/*
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==================
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ReverseWinding
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==================
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*/
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winding_t *ReverseWinding (winding_t *w)
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{
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int i;
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winding_t *c;
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c = AllocWinding (w->numpoints);
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for (i=0 ; i<w->numpoints ; i++)
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{
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VectorCopy (w->p[w->numpoints-1-i], c->p[i]);
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}
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c->numpoints = w->numpoints;
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return c;
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}
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/*
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=============
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ClipWindingEpsilon
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=============
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*/
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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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{
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vec_t dists[MAX_POINTS_ON_WINDING+4];
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int sides[MAX_POINTS_ON_WINDING+4];
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int counts[3];
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static vec_t dot; // VC 4.2 optimizer bug if not static
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int i, j;
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vec_t *p1, *p2;
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vec3_t mid;
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winding_t *f, *b;
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int maxpts;
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counts[0] = counts[1] = counts[2] = 0;
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// determine sides for each point
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for (i=0 ; i<in->numpoints ; i++)
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{
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dot = DotProduct (in->p[i], normal);
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dot -= dist;
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dists[i] = dot;
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if (dot > epsilon)
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sides[i] = SIDE_FRONT;
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else if (dot < -epsilon)
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sides[i] = SIDE_BACK;
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else
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{
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sides[i] = SIDE_ON;
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}
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counts[sides[i]]++;
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}
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sides[i] = sides[0];
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dists[i] = dists[0];
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*front = *back = NULL;
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if (!counts[0])
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{
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*back = CopyWinding (in);
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return;
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}
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if (!counts[1])
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{
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*front = CopyWinding (in);
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return;
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}
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maxpts = in->numpoints+4; // cant use counts[0]+2 because
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// of fp grouping errors
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*front = f = AllocWinding (maxpts);
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*back = b = AllocWinding (maxpts);
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for (i=0 ; i<in->numpoints ; i++)
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{
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p1 = in->p[i];
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if (sides[i] == SIDE_ON)
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{
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VectorCopy (p1, f->p[f->numpoints]);
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f->numpoints++;
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VectorCopy (p1, b->p[b->numpoints]);
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b->numpoints++;
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continue;
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}
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if (sides[i] == SIDE_FRONT)
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{
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VectorCopy (p1, f->p[f->numpoints]);
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f->numpoints++;
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}
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if (sides[i] == SIDE_BACK)
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{
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VectorCopy (p1, b->p[b->numpoints]);
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b->numpoints++;
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}
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if (sides[i+1] == SIDE_ON || sides[i+1] == sides[i])
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continue;
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// generate a split point
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p2 = in->p[(i+1)%in->numpoints];
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dot = dists[i] / (dists[i]-dists[i+1]);
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for (j=0 ; j<3 ; j++)
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{ // avoid round off error when possible
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if (normal[j] == 1)
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mid[j] = dist;
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else if (normal[j] == -1)
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mid[j] = -dist;
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else
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mid[j] = p1[j] + dot*(p2[j]-p1[j]);
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}
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VectorCopy (mid, f->p[f->numpoints]);
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f->numpoints++;
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VectorCopy (mid, b->p[b->numpoints]);
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b->numpoints++;
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}
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if (f->numpoints > maxpts || b->numpoints > maxpts)
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Error ("ClipWinding: points exceeded estimate");
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if (f->numpoints > MAX_POINTS_ON_WINDING || b->numpoints > MAX_POINTS_ON_WINDING)
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Error ("ClipWinding: MAX_POINTS_ON_WINDING");
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}
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/*
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=============
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ChopWindingInPlace
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=============
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*/
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void ChopWindingInPlace (winding_t **inout, vec3_t normal, vec_t dist, vec_t epsilon)
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{
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winding_t *in;
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vec_t dists[MAX_POINTS_ON_WINDING+4];
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int sides[MAX_POINTS_ON_WINDING+4];
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int counts[3];
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static vec_t dot; // VC 4.2 optimizer bug if not static
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int i, j;
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vec_t *p1, *p2;
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vec3_t mid;
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winding_t *f;
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int maxpts;
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in = *inout;
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counts[0] = counts[1] = counts[2] = 0;
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// determine sides for each point
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for (i=0 ; i<in->numpoints ; i++)
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{
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dot = DotProduct (in->p[i], normal);
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dot -= dist;
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dists[i] = dot;
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if (dot > epsilon)
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sides[i] = SIDE_FRONT;
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else if (dot < -epsilon)
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sides[i] = SIDE_BACK;
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else
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{
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sides[i] = SIDE_ON;
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}
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counts[sides[i]]++;
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}
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sides[i] = sides[0];
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dists[i] = dists[0];
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if (!counts[0])
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{
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FreeWinding (in);
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*inout = NULL;
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return;
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}
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if (!counts[1])
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return; // inout stays the same
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maxpts = in->numpoints+4; // cant use counts[0]+2 because
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// of fp grouping errors
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f = AllocWinding (maxpts);
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for (i=0 ; i<in->numpoints ; i++)
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{
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p1 = in->p[i];
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if (sides[i] == SIDE_ON)
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{
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VectorCopy (p1, f->p[f->numpoints]);
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f->numpoints++;
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continue;
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}
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if (sides[i] == SIDE_FRONT)
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{
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VectorCopy (p1, f->p[f->numpoints]);
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f->numpoints++;
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}
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if (sides[i+1] == SIDE_ON || sides[i+1] == sides[i])
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continue;
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// generate a split point
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p2 = in->p[(i+1)%in->numpoints];
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dot = dists[i] / (dists[i]-dists[i+1]);
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for (j=0 ; j<3 ; j++)
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{ // avoid round off error when possible
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if (normal[j] == 1)
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mid[j] = dist;
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else if (normal[j] == -1)
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mid[j] = -dist;
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else
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mid[j] = p1[j] + dot*(p2[j]-p1[j]);
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}
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VectorCopy (mid, f->p[f->numpoints]);
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f->numpoints++;
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}
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if (f->numpoints > maxpts)
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Error ("ClipWinding: points exceeded estimate");
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if (f->numpoints > MAX_POINTS_ON_WINDING)
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Error ("ClipWinding: MAX_POINTS_ON_WINDING");
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FreeWinding (in);
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*inout = f;
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}
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/*
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=================
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ChopWinding
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Returns the fragment of in that is on the front side
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of the cliping plane. The original is freed.
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=================
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*/
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winding_t *ChopWinding (winding_t *in, vec3_t normal, vec_t dist)
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{
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winding_t *f, *b;
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ClipWindingEpsilon (in, normal, dist, ON_EPSILON, &f, &b);
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FreeWinding (in);
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if (b)
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FreeWinding (b);
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return f;
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}
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/*
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=================
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CheckWinding
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=================
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*/
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void CheckWinding (winding_t *w)
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{
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int i, j;
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vec_t *p1, *p2;
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vec_t d, edgedist;
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vec3_t dir, edgenormal, facenormal;
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vec_t area;
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vec_t facedist;
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if (w->numpoints < 3)
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Error ("CheckWinding: %i points",w->numpoints);
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area = WindingArea(w);
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if (area < 1)
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Error ("CheckWinding: %f area", area);
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WindingPlane (w, facenormal, &facedist);
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|
|
for (i=0 ; i<w->numpoints ; i++)
|
|
{
|
|
p1 = w->p[i];
|
|
|
|
for (j=0 ; j<3 ; j++)
|
|
if (p1[j] > MAX_WORLD_COORD || p1[j] < MIN_WORLD_COORD)
|
|
Error ("CheckFace: BUGUS_RANGE: %f",p1[j]);
|
|
|
|
j = i+1 == w->numpoints ? 0 : i+1;
|
|
|
|
// check the point is on the face plane
|
|
d = DotProduct (p1, facenormal) - facedist;
|
|
if (d < -ON_EPSILON || d > ON_EPSILON)
|
|
Error ("CheckWinding: point off plane");
|
|
|
|
// check the edge isnt degenerate
|
|
p2 = w->p[j];
|
|
VectorSubtract (p2, p1, dir);
|
|
|
|
if (VectorLength (dir) < ON_EPSILON)
|
|
Error ("CheckWinding: degenerate edge");
|
|
|
|
CrossProduct (facenormal, dir, edgenormal);
|
|
VectorNormalize (edgenormal, edgenormal);
|
|
edgedist = DotProduct (p1, edgenormal);
|
|
edgedist += ON_EPSILON;
|
|
|
|
// all other points must be on front side
|
|
for (j=0 ; j<w->numpoints ; j++)
|
|
{
|
|
if (j == i)
|
|
continue;
|
|
d = DotProduct (w->p[j], edgenormal);
|
|
if (d > edgedist)
|
|
Error ("CheckWinding: non-convex");
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
============
|
|
WindingOnPlaneSide
|
|
============
|
|
*/
|
|
int WindingOnPlaneSide (winding_t *w, vec3_t normal, vec_t dist)
|
|
{
|
|
qboolean front, back;
|
|
int i;
|
|
vec_t d;
|
|
|
|
front = qfalse;
|
|
back = qfalse;
|
|
for (i=0 ; i<w->numpoints ; i++)
|
|
{
|
|
d = DotProduct (w->p[i], normal) - dist;
|
|
if (d < -ON_EPSILON)
|
|
{
|
|
if (front)
|
|
return SIDE_CROSS;
|
|
back = qtrue;
|
|
continue;
|
|
}
|
|
if (d > ON_EPSILON)
|
|
{
|
|
if (back)
|
|
return SIDE_CROSS;
|
|
front = qtrue;
|
|
continue;
|
|
}
|
|
}
|
|
|
|
if (back)
|
|
return SIDE_BACK;
|
|
if (front)
|
|
return SIDE_FRONT;
|
|
return SIDE_ON;
|
|
}
|
|
|
|
|
|
/*
|
|
=================
|
|
AddWindingToConvexHull
|
|
|
|
Both w and *hull are on the same plane
|
|
=================
|
|
*/
|
|
#define MAX_HULL_POINTS 128
|
|
void AddWindingToConvexHull( winding_t *w, winding_t **hull, vec3_t normal ) {
|
|
int i, j, k;
|
|
float *p, *copy;
|
|
vec3_t dir;
|
|
float d;
|
|
int numHullPoints, numNew;
|
|
vec3_t hullPoints[MAX_HULL_POINTS];
|
|
vec3_t newHullPoints[MAX_HULL_POINTS];
|
|
vec3_t hullDirs[MAX_HULL_POINTS];
|
|
qboolean hullSide[MAX_HULL_POINTS];
|
|
qboolean outside;
|
|
|
|
if ( !*hull ) {
|
|
*hull = CopyWinding( w );
|
|
return;
|
|
}
|
|
|
|
numHullPoints = (*hull)->numpoints;
|
|
memcpy( hullPoints, (*hull)->p, numHullPoints * sizeof(vec3_t) );
|
|
|
|
for ( i = 0 ; i < w->numpoints ; i++ ) {
|
|
p = w->p[i];
|
|
|
|
// calculate hull side vectors
|
|
for ( j = 0 ; j < numHullPoints ; j++ ) {
|
|
k = ( j + 1 ) % numHullPoints;
|
|
|
|
VectorSubtract( hullPoints[k], hullPoints[j], dir );
|
|
VectorNormalize( dir, dir );
|
|
CrossProduct( normal, dir, hullDirs[j] );
|
|
}
|
|
|
|
outside = qfalse;
|
|
for ( j = 0 ; j < numHullPoints ; j++ ) {
|
|
VectorSubtract( p, hullPoints[j], dir );
|
|
d = DotProduct( dir, hullDirs[j] );
|
|
if ( d >= ON_EPSILON ) {
|
|
outside = qtrue;
|
|
}
|
|
if ( d >= -ON_EPSILON ) {
|
|
hullSide[j] = qtrue;
|
|
} else {
|
|
hullSide[j] = qfalse;
|
|
}
|
|
}
|
|
|
|
// if the point is effectively inside, do nothing
|
|
if ( !outside ) {
|
|
continue;
|
|
}
|
|
|
|
// find the back side to front side transition
|
|
for ( j = 0 ; j < numHullPoints ; j++ ) {
|
|
if ( !hullSide[ j % numHullPoints ] && hullSide[ (j + 1) % numHullPoints ] ) {
|
|
break;
|
|
}
|
|
}
|
|
if ( j == numHullPoints ) {
|
|
continue;
|
|
}
|
|
|
|
// insert the point here
|
|
VectorCopy( p, newHullPoints[0] );
|
|
numNew = 1;
|
|
|
|
// copy over all points that aren't double fronts
|
|
j = (j+1)%numHullPoints;
|
|
for ( k = 0 ; k < numHullPoints ; k++ ) {
|
|
if ( hullSide[ (j+k) % numHullPoints ] && hullSide[ (j+k+1) % numHullPoints ] ) {
|
|
continue;
|
|
}
|
|
copy = hullPoints[ (j+k+1) % numHullPoints ];
|
|
VectorCopy( copy, newHullPoints[numNew] );
|
|
numNew++;
|
|
}
|
|
|
|
numHullPoints = numNew;
|
|
memcpy( hullPoints, newHullPoints, numHullPoints * sizeof(vec3_t) );
|
|
}
|
|
|
|
FreeWinding( *hull );
|
|
w = AllocWinding( numHullPoints );
|
|
w->numpoints = numHullPoints;
|
|
*hull = w;
|
|
memcpy( w->p, hullPoints, numHullPoints * sizeof(vec3_t) );
|
|
}
|
|
|
|
|