mirror of
https://github.com/UberGames/GtkRadiant.git
synced 2024-12-12 21:32:18 +00:00
649 lines
13 KiB
C
649 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 "cmdlib.h"
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#include "inout.h"
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#include "mathlib.h"
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#include "polylib.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 8192
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void pw( winding_t *w ){
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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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winding_t *w;
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int s;
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if ( numthreads == 1 ) {
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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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}
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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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if ( *(unsigned *)w == 0xdeaddead ) {
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Error( "FreeWinding: freed a freed winding" );
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}
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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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}
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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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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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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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}
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if ( numthreads == 1 ) {
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c_removed += w->numpoints - nump;
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}
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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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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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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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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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}
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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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=============
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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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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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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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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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}
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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, 8192, vup );
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VectorScale( vright, 8192, 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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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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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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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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}
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else if ( dot < -epsilon ) {
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sides[i] = SIDE_BACK;
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}
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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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*back = CopyWinding( in );
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return;
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}
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if ( !counts[1] ) {
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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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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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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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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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}
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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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}
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else if ( normal[j] == -1 ) {
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mid[j] = -dist;
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}
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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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}
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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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}
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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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=============
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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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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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}
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else if ( dot < -epsilon ) {
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sides[i] = SIDE_BACK;
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}
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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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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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}
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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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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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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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}
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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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}
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else if ( normal[j] == -1 ) {
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mid[j] = -dist;
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}
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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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}
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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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}
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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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}
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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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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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}
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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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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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}
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|
|
|
area = WindingArea( w );
|
|
if ( area < 1 ) {
|
|
Error( "CheckWinding: %f area", area );
|
|
}
|
|
|
|
WindingPlane( w, facenormal, &facedist );
|
|
|
|
for ( i = 0 ; i < w->numpoints ; i++ )
|
|
{
|
|
p1 = w->p[i];
|
|
|
|
for ( j = 0 ; j < 3 ; j++ )
|
|
if ( p1[j] > BOGUS_RANGE || p1[j] < -BOGUS_RANGE ) {
|
|
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 = false;
|
|
back = false;
|
|
for ( i = 0 ; i < w->numpoints ; i++ )
|
|
{
|
|
d = DotProduct( w->p[i], normal ) - dist;
|
|
if ( d < -ON_EPSILON ) {
|
|
if ( front ) {
|
|
return SIDE_CROSS;
|
|
}
|
|
back = true;
|
|
continue;
|
|
}
|
|
if ( d > ON_EPSILON ) {
|
|
if ( back ) {
|
|
return SIDE_CROSS;
|
|
}
|
|
front = true;
|
|
continue;
|
|
}
|
|
}
|
|
|
|
if ( back ) {
|
|
return SIDE_BACK;
|
|
}
|
|
if ( front ) {
|
|
return SIDE_FRONT;
|
|
}
|
|
return SIDE_ON;
|
|
}
|