mirror of
https://github.com/UberGames/GtkRadiant.git
synced 2024-11-28 22:52:15 +00:00
647 lines
13 KiB
C
647 lines
13 KiB
C
/*
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Copyright (C) 1999-2007 id Software, Inc. and contributors.
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For a list of contributors, see the accompanying CONTRIBUTORS file.
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This file is part of GtkRadiant.
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GtkRadiant is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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GtkRadiant is distributed in the hope that it will be useful,
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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 GtkRadiant; 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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#include "qbsp.h"
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/*
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tag all brushes with original contents
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brushes may contain multiple contents
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there will be no brush overlap after csg phase
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each side has a count of the other sides it splits
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the best split will be the one that minimizes the total split counts
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of all remaining sides
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precalc side on plane table
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evaluate split side
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{
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cost = 0
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for all sides
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for all sides
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get
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if side splits side and splitside is on same child
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cost++;
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}
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*/
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void SplitBrush2( bspbrush_t *brush, int planenum,
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bspbrush_t **front, bspbrush_t **back ){
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SplitBrush( brush, planenum, front, back );
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#if 0
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if ( *front && ( *front )->sides[( *front )->numsides - 1].texinfo == -1 ) {
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( *front )->sides[( *front )->numsides - 1].texinfo = ( *front )->sides[0].texinfo; // not -1
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}
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if ( *back && ( *back )->sides[( *back )->numsides - 1].texinfo == -1 ) {
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( *back )->sides[( *back )->numsides - 1].texinfo = ( *back )->sides[0].texinfo; // not -1
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}
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#endif
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}
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/*
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===============
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SubtractBrush
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Returns a list of brushes that remain after B is subtracted from A.
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May by empty if A is contained inside B.
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The originals are undisturbed.
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===============
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*/
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bspbrush_t *SubtractBrush( bspbrush_t *a, bspbrush_t *b ){ // a - b = out (list)
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int i;
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bspbrush_t *front, *back;
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bspbrush_t *out, *in;
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in = a;
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out = NULL;
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for ( i = 0 ; i < b->numsides && in ; i++ )
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{
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SplitBrush2( in, b->sides[i].planenum, &front, &back );
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if ( in != a ) {
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FreeBrush( in );
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}
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if ( front ) { // add to list
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front->next = out;
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out = front;
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}
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in = back;
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}
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if ( in ) {
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FreeBrush( in );
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}
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else
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{ // didn't really intersect
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FreeBrushList( out );
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return a;
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}
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return out;
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}
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/*
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===============
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IntersectBrush
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Returns a single brush made up by the intersection of the
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two provided brushes, or NULL if they are disjoint.
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The originals are undisturbed.
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===============
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*/
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bspbrush_t *IntersectBrush( bspbrush_t *a, bspbrush_t *b ){
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int i;
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bspbrush_t *front, *back;
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bspbrush_t *in;
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in = a;
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for ( i = 0 ; i < b->numsides && in ; i++ )
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{
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SplitBrush2( in, b->sides[i].planenum, &front, &back );
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if ( in != a ) {
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FreeBrush( in );
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}
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if ( front ) {
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FreeBrush( front );
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}
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in = back;
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}
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if ( in == a ) {
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return NULL;
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}
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in->next = NULL;
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return in;
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}
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/*
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===============
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BrushesDisjoint
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Returns true if the two brushes definately do not intersect.
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There will be false negatives for some non-axial combinations.
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===============
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*/
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qboolean BrushesDisjoint( bspbrush_t *a, bspbrush_t *b ){
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int i, j;
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// check bounding boxes
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for ( i = 0 ; i < 3 ; i++ )
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if ( a->mins[i] >= b->maxs[i]
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|| a->maxs[i] <= b->mins[i] ) {
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return true;
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} // bounding boxes don't overlap
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// check for opposing planes
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for ( i = 0 ; i < a->numsides ; i++ )
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{
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for ( j = 0 ; j < b->numsides ; j++ )
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{
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if ( a->sides[i].planenum ==
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( b->sides[j].planenum ^ 1 ) ) {
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return true; // opposite planes, so not touching
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}
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}
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}
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return false; // might intersect
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}
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/*
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===============
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IntersectionContents
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Returns a content word for the intersection of two brushes.
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Some combinations will generate a combination (water + clip),
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but most will be the stronger of the two contents.
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===============
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*/
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int IntersectionContents( int c1, int c2 ){
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int out;
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out = c1 | c2;
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if ( out & CONTENTS_SOLID ) {
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out = CONTENTS_SOLID;
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}
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return out;
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}
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int minplanenums[3];
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int maxplanenums[3];
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/*
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===============
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ClipBrushToBox
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Any planes shared with the box edge will be set to no texinfo
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===============
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*/
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bspbrush_t *ClipBrushToBox( bspbrush_t *brush, vec3_t clipmins, vec3_t clipmaxs ){
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int i, j;
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bspbrush_t *front, *back;
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int p;
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for ( j = 0 ; j < 2 ; j++ )
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{
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if ( brush->maxs[j] > clipmaxs[j] ) {
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SplitBrush( brush, maxplanenums[j], &front, &back );
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if ( front ) {
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FreeBrush( front );
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}
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brush = back;
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if ( !brush ) {
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return NULL;
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}
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}
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if ( brush->mins[j] < clipmins[j] ) {
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SplitBrush( brush, minplanenums[j], &front, &back );
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if ( back ) {
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FreeBrush( back );
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}
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brush = front;
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if ( !brush ) {
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return NULL;
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}
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}
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}
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// remove any colinear faces
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for ( i = 0 ; i < brush->numsides ; i++ )
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{
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p = brush->sides[i].planenum & ~1;
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if ( p == maxplanenums[0] || p == maxplanenums[1]
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|| p == minplanenums[0] || p == minplanenums[1] ) {
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brush->sides[i].texinfo = TEXINFO_NODE;
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brush->sides[i].visible = false;
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}
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}
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return brush;
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}
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/*
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===============
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MakeBspBrushList
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===============
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*/
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bspbrush_t *MakeBspBrushList( int startbrush, int endbrush,
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vec3_t clipmins, vec3_t clipmaxs ){
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mapbrush_t *mb;
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bspbrush_t *brushlist, *newbrush;
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int i, j;
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int c_faces;
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int c_brushes;
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int numsides;
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int vis;
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vec3_t normal;
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float dist;
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for ( i = 0 ; i < 2 ; i++ )
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{
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VectorClear( normal );
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normal[i] = 1;
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dist = clipmaxs[i];
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maxplanenums[i] = FindFloatPlane( normal, dist );
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dist = clipmins[i];
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minplanenums[i] = FindFloatPlane( normal, dist );
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}
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brushlist = NULL;
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c_faces = 0;
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c_brushes = 0;
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for ( i = startbrush ; i < endbrush ; i++ )
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{
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mb = &mapbrushes[i];
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numsides = mb->numsides;
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if ( !numsides ) {
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continue;
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}
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// make sure the brush has at least one face showing
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vis = 0;
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for ( j = 0 ; j < numsides ; j++ )
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if ( mb->original_sides[j].visible && mb->original_sides[j].winding ) {
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vis++;
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}
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#if 0
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if ( !vis ) {
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continue; // no faces at all
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}
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#endif
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// if the brush is outside the clip area, skip it
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for ( j = 0 ; j < 3 ; j++ )
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if ( mb->mins[j] >= clipmaxs[j]
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|| mb->maxs[j] <= clipmins[j] ) {
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break;
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}
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if ( j != 3 ) {
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continue;
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}
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//
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// make a copy of the brush
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//
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newbrush = AllocBrush( mb->numsides );
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newbrush->original = mb;
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newbrush->numsides = mb->numsides;
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memcpy( newbrush->sides, mb->original_sides, numsides * sizeof( side_t ) );
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for ( j = 0 ; j < numsides ; j++ )
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{
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if ( newbrush->sides[j].winding ) {
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newbrush->sides[j].winding = CopyWinding( newbrush->sides[j].winding );
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}
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if ( newbrush->sides[j].surf & SURF_HINT ) {
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newbrush->sides[j].visible = true; // hints are always visible
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}
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}
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VectorCopy( mb->mins, newbrush->mins );
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VectorCopy( mb->maxs, newbrush->maxs );
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//
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// carve off anything outside the clip box
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//
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newbrush = ClipBrushToBox( newbrush, clipmins, clipmaxs );
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if ( !newbrush ) {
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continue;
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}
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c_faces += vis;
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c_brushes++;
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newbrush->next = brushlist;
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brushlist = newbrush;
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}
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return brushlist;
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}
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/*
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===============
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AddBspBrushListToTail
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===============
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*/
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bspbrush_t *AddBrushListToTail( bspbrush_t *list, bspbrush_t *tail ){
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bspbrush_t *walk, *next;
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for ( walk = list ; walk ; walk = next )
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{ // add to end of list
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next = walk->next;
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walk->next = NULL;
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tail->next = walk;
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tail = walk;
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}
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return tail;
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}
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/*
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===========
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CullList
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Builds a new list that doesn't hold the given brush
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===========
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*/
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bspbrush_t *CullList( bspbrush_t *list, bspbrush_t *skip1 ){
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bspbrush_t *newlist;
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bspbrush_t *next;
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newlist = NULL;
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for ( ; list ; list = next )
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{
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next = list->next;
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if ( list == skip1 ) {
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FreeBrush( list );
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continue;
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}
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list->next = newlist;
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newlist = list;
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}
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return newlist;
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}
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/*
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==================
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WriteBrushMap
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==================
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*/
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void WriteBrushMap( char *name, bspbrush_t *list ){
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FILE *f;
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side_t *s;
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int i;
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winding_t *w;
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Sys_Printf( "writing %s\n", name );
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f = fopen( name, "wb" );
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if ( !f ) {
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Error( "Can't write %s\b", name );
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}
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fprintf( f, "{\n\"classname\" \"worldspawn\"\n" );
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for ( ; list ; list = list->next )
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{
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fprintf( f, "{\n" );
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for ( i = 0,s = list->sides ; i < list->numsides ; i++,s++ )
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{
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w = BaseWindingForPlane( mapplanes[s->planenum].normal, mapplanes[s->planenum].dist );
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fprintf( f,"( %i %i %i ) ", (int)w->p[0][0], (int)w->p[0][1], (int)w->p[0][2] );
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fprintf( f,"( %i %i %i ) ", (int)w->p[1][0], (int)w->p[1][1], (int)w->p[1][2] );
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fprintf( f,"( %i %i %i ) ", (int)w->p[2][0], (int)w->p[2][1], (int)w->p[2][2] );
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fprintf( f, "%s 0 0 0 1 1\n", texinfo[s->texinfo].texture );
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FreeWinding( w );
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}
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fprintf( f, "}\n" );
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}
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fprintf( f, "}\n" );
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fclose( f );
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}
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/*
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==================
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BrushGE
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Returns true if b1 is allowed to bite b2
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==================
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*/
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qboolean BrushGE( bspbrush_t *b1, bspbrush_t *b2 ){
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// detail brushes never bite structural brushes
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if ( ( b1->original->contents & CONTENTS_DETAIL )
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&& !( b2->original->contents & CONTENTS_DETAIL ) ) {
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return false;
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}
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if ( b1->original->contents & CONTENTS_SOLID ) {
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return true;
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}
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return false;
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}
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/*
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=================
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ChopBrushes
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Carves any intersecting solid brushes into the minimum number
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of non-intersecting brushes.
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=================
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*/
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bspbrush_t *ChopBrushes( bspbrush_t *head ){
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bspbrush_t *b1, *b2, *next;
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bspbrush_t *tail;
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bspbrush_t *keep;
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bspbrush_t *sub, *sub2;
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int c1, c2;
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Sys_FPrintf( SYS_VRB, "---- ChopBrushes ----\n" );
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Sys_FPrintf( SYS_VRB, "original brushes: %i\n", CountBrushList( head ) );
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#if 0
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if ( startbrush == 0 ) {
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WriteBrushList( "before.gl", head, false );
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}
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#endif
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keep = NULL;
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newlist:
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// find tail
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if ( !head ) {
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return NULL;
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}
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for ( tail = head ; tail->next ; tail = tail->next )
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;
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for ( b1 = head ; b1 ; b1 = next )
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{
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next = b1->next;
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for ( b2 = b1->next ; b2 ; b2 = b2->next )
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{
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if ( BrushesDisjoint( b1, b2 ) ) {
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continue;
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}
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sub = NULL;
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sub2 = NULL;
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c1 = 999999;
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c2 = 999999;
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if ( BrushGE( b2, b1 ) ) {
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sub = SubtractBrush( b1, b2 );
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if ( sub == b1 ) {
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continue; // didn't really intersect
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}
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if ( !sub ) { // b1 is swallowed by b2
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head = CullList( b1, b1 );
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goto newlist;
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}
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c1 = CountBrushList( sub );
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}
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if ( BrushGE( b1, b2 ) ) {
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sub2 = SubtractBrush( b2, b1 );
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if ( sub2 == b2 ) {
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continue; // didn't really intersect
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}
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if ( !sub2 ) { // b2 is swallowed by b1
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FreeBrushList( sub );
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head = CullList( b1, b2 );
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goto newlist;
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}
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c2 = CountBrushList( sub2 );
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}
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if ( !sub && !sub2 ) {
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continue; // neither one can bite
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}
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// only accept if it didn't fragment
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// (commening this out allows full fragmentation)
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if ( c1 > 1 && c2 > 1 ) {
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if ( sub2 ) {
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FreeBrushList( sub2 );
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}
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if ( sub ) {
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FreeBrushList( sub );
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}
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continue;
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}
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if ( c1 < c2 ) {
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if ( sub2 ) {
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FreeBrushList( sub2 );
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}
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tail = AddBrushListToTail( sub, tail );
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head = CullList( b1, b1 );
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goto newlist;
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}
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else
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{
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if ( sub ) {
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FreeBrushList( sub );
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}
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tail = AddBrushListToTail( sub2, tail );
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head = CullList( b1, b2 );
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goto newlist;
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}
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}
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if ( !b2 ) { // b1 is no longer intersecting anything, so keep it
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b1->next = keep;
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keep = b1;
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}
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}
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Sys_FPrintf( SYS_VRB, "output brushes: %i\n", CountBrushList( keep ) );
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#if 0
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{
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WriteBrushList( "after.gl", keep, false );
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WriteBrushMap( "after.map", keep );
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}
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#endif
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return keep;
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}
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/*
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=================
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InitialBrushList
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=================
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*/
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bspbrush_t *InitialBrushList( bspbrush_t *list ){
|
|
bspbrush_t *b;
|
|
bspbrush_t *out, *newb;
|
|
int i;
|
|
|
|
// only return brushes that have visible faces
|
|
out = NULL;
|
|
for ( b = list ; b ; b = b->next )
|
|
{
|
|
#if 0
|
|
for ( i = 0 ; i < b->numsides ; i++ )
|
|
if ( b->sides[i].visible ) {
|
|
break;
|
|
}
|
|
if ( i == b->numsides ) {
|
|
continue;
|
|
}
|
|
#endif
|
|
newb = CopyBrush( b );
|
|
newb->next = out;
|
|
out = newb;
|
|
|
|
// clear visible, so it must be set by MarkVisibleFaces_r
|
|
// to be used in the optimized list
|
|
for ( i = 0 ; i < b->numsides ; i++ )
|
|
{
|
|
newb->sides[i].original = &b->sides[i];
|
|
// newb->sides[i].visible = true;
|
|
b->sides[i].visible = false;
|
|
}
|
|
}
|
|
|
|
return out;
|
|
}
|
|
|
|
/*
|
|
=================
|
|
OptimizedBrushList
|
|
=================
|
|
*/
|
|
bspbrush_t *OptimizedBrushList( bspbrush_t *list ){
|
|
bspbrush_t *b;
|
|
bspbrush_t *out, *newb;
|
|
int i;
|
|
|
|
// only return brushes that have visible faces
|
|
out = NULL;
|
|
for ( b = list ; b ; b = b->next )
|
|
{
|
|
for ( i = 0 ; i < b->numsides ; i++ )
|
|
if ( b->sides[i].visible ) {
|
|
break;
|
|
}
|
|
if ( i == b->numsides ) {
|
|
continue;
|
|
}
|
|
newb = CopyBrush( b );
|
|
newb->next = out;
|
|
out = newb;
|
|
}
|
|
|
|
// WriteBrushList ("vis.gl", out, true);
|
|
|
|
return out;
|
|
}
|