mirror of
https://github.com/TTimo/GtkRadiant.git
synced 2025-01-27 03:41:03 +00:00
c4e2a20d08
brush is invalid rather than using its own code (it already called BoundBrush to update the bounds, it may as well use the result as well) git-svn-id: svn://svn.icculus.org/gtkradiant/GtkRadiant/trunk@157 8a3a26a2-13c4-0310-b231-cf6edde360e5
970 lines
18 KiB
C
970 lines
18 KiB
C
/* -------------------------------------------------------------------------------
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Copyright (C) 1999-2006 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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This code has been altered significantly from its original form, to support
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several games based on the Quake III Arena engine, in the form of "Q3Map2."
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------------------------------------------------------------------------------- */
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/* marker */
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#define BRUSH_C
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/* dependencies */
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#include "q3map2.h"
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/* -------------------------------------------------------------------------------
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functions
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------------------------------------------------------------------------------- */
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/*
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AllocSideRef() - ydnar
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allocates and assigns a brush side reference
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*/
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sideRef_t *AllocSideRef( side_t *side, sideRef_t *next )
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{
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sideRef_t *sideRef;
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/* dummy check */
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if( side == NULL )
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return next;
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/* allocate and return */
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sideRef = safe_malloc( sizeof( *sideRef ) );
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sideRef->side = side;
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sideRef->next = next;
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return sideRef;
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}
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/*
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CountBrushList()
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counts the number of brushes in a brush linked list
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*/
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int CountBrushList( brush_t *brushes )
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{
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int c = 0;
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/* count brushes */
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for( brushes; brushes != NULL; brushes = brushes->next )
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c++;
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return c;
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}
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/*
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AllocBrush()
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allocates a new brush
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*/
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brush_t *AllocBrush( int numSides )
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{
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brush_t *bb;
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int c;
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/* allocate and clear */
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if( numSides <= 0 )
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Error( "AllocBrush called with numsides = %d", numSides );
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c = (int) &(((brush_t*) 0)->sides[ numSides ]);
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bb = safe_malloc( c );
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memset( bb, 0, c );
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if( numthreads == 1 )
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numActiveBrushes++;
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/* return it */
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return bb;
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}
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/*
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FreeBrush()
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frees a single brush and all sides/windings
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*/
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void FreeBrush( brush_t *b )
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{
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int i;
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/* error check */
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if( *((int*) b) == 0xFEFEFEFE )
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{
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Sys_FPrintf( SYS_VRB, "WARNING: Attempt to free an already freed brush!\n" );
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return;
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}
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/* free brush sides */
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for( i = 0; i < b->numsides; i++ )
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if( b->sides[i].winding != NULL )
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FreeWinding( b->sides[ i ].winding );
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/* ydnar: overwrite it */
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memset( b, 0xFE, (int) &(((brush_t*) 0)->sides[ b->numsides ]) );
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*((int*) b) = 0xFEFEFEFE;
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/* free it */
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free( b );
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if( numthreads == 1 )
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numActiveBrushes--;
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}
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/*
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FreeBrushList()
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frees a linked list of brushes
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*/
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void FreeBrushList( brush_t *brushes )
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{
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brush_t *next;
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/* walk brush list */
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for( brushes; brushes != NULL; brushes = next )
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{
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next = brushes->next;
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FreeBrush( brushes );
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}
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}
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/*
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CopyBrush()
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duplicates the brush, sides, and windings
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*/
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brush_t *CopyBrush( brush_t *brush )
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{
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brush_t *newBrush;
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int size;
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int i;
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/* copy brush */
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size = (int) &(((brush_t*) 0)->sides[ brush->numsides ]);
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newBrush = AllocBrush( brush->numsides );
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memcpy( newBrush, brush, size );
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/* ydnar: nuke linked list */
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newBrush->next = NULL;
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/* copy sides */
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for( i = 0; i < brush->numsides; i++ )
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{
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if( brush->sides[ i ].winding != NULL )
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newBrush->sides[ i ].winding = CopyWinding( brush->sides[ i ].winding );
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}
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/* return it */
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return newBrush;
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}
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/*
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BoundBrush()
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sets the mins/maxs based on the windings
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returns false if the brush doesn't enclose a valid volume
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*/
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qboolean BoundBrush( brush_t *brush )
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{
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int i, j;
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winding_t *w;
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ClearBounds( brush->mins, brush->maxs );
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for( i = 0; i < brush->numsides; i++ )
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{
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w = brush->sides[ i ].winding;
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if( w == NULL )
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continue;
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for( j = 0; j < w->numpoints; j++ )
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AddPointToBounds( w->p[ j ], brush->mins, brush->maxs );
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}
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for( i = 0; i < 3; i++ )
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{
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if( brush->mins[ i ] < MIN_WORLD_COORD || brush->maxs[ i ] > MAX_WORLD_COORD || brush->mins[i] >= brush->maxs[ i ] )
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return qfalse;
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}
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return qtrue;
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}
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/*
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SnapWeldVector() - ydnar
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welds two vec3_t's into a third, taking into account nearest-to-integer
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instead of averaging
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*/
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#define SNAP_EPSILON 0.01
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void SnapWeldVector( vec3_t a, vec3_t b, vec3_t out )
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{
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int i;
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vec_t ai, bi, outi;
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/* dummy check */
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if( a == NULL || b == NULL || out == NULL )
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return;
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/* do each element */
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for( i = 0; i < 3; i++ )
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{
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/* round to integer */
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ai = Q_rint( a[ i ] );
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bi = Q_rint( a[ i ] );
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/* prefer exact integer */
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if( ai == a[ i ] )
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out[ i ] = a[ i ];
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else if( bi == b[ i ] )
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out[ i ] = b[ i ];
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/* use nearest */
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else if( fabs( ai - a[ i ] ) < fabs( bi < b[ i ] ) )
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out[ i ] = a[ i ];
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else
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out[ i ] = b[ i ];
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/* snap */
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outi = Q_rint( out[ i ] );
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if( fabs( outi - out[ i ] ) <= SNAP_EPSILON )
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out[ i ] = outi;
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}
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}
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/*
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FixWinding() - ydnar
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removes degenerate edges from a winding
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returns qtrue if the winding is valid
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*/
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#define DEGENERATE_EPSILON 0.1
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qboolean FixWinding( winding_t *w )
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{
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qboolean valid = qtrue;
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int i, j, k;
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vec3_t vec;
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float dist;
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/* dummy check */
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if( !w )
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return qfalse;
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/* check all verts */
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for( i = 0; i < w->numpoints; i++ )
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{
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/* don't remove points if winding is a triangle */
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if( w->numpoints == 3 )
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return valid;
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/* get second point index */
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j = (i + 1) % w->numpoints;
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/* degenerate edge? */
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VectorSubtract( w->p[ i ], w->p[ j ], vec );
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dist = VectorLength( vec );
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if( dist < DEGENERATE_EPSILON )
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{
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valid = qfalse;
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//Sys_FPrintf( SYS_VRB, "WARNING: Degenerate winding edge found, fixing...\n" );
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/* create an average point (ydnar 2002-01-26: using nearest-integer weld preference) */
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SnapWeldVector( w->p[ i ], w->p[ j ], vec );
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VectorCopy( vec, w->p[ i ] );
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//VectorAdd( w->p[ i ], w->p[ j ], vec );
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//VectorScale( vec, 0.5, w->p[ i ] );
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/* move the remaining verts */
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for( k = i + 2; k < w->numpoints; k++ )
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{
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VectorCopy( w->p[ k ], w->p[ k - 1 ] );
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}
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w->numpoints--;
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}
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}
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/* one last check and return */
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if( w->numpoints < 3 )
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valid = qfalse;
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return valid;
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}
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/*
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CreateBrushWindings()
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makes basewindigs for sides and mins/maxs for the brush
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returns false if the brush doesn't enclose a valid volume
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*/
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qboolean CreateBrushWindings( brush_t *brush )
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{
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int i, j;
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winding_t *w;
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side_t *side;
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plane_t *plane;
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/* walk the list of brush sides */
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for( i = 0; i < brush->numsides; i++ )
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{
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/* get side and plane */
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side = &brush->sides[ i ];
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plane = &mapplanes[ side->planenum ];
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/* make huge winding */
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w = BaseWindingForPlane( plane->normal, plane->dist );
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/* walk the list of brush sides */
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for( j = 0; j < brush->numsides && w != NULL; j++ )
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{
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if( i == j )
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continue;
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if( brush->sides[ j ].planenum == (brush->sides[ i ].planenum ^ 1) )
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continue; /* back side clipaway */
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if( brush->sides[ j ].bevel )
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continue;
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plane = &mapplanes[ brush->sides[ j ].planenum ^ 1 ];
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ChopWindingInPlace( &w, plane->normal, plane->dist, 0 ); // CLIP_EPSILON );
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/* ydnar: fix broken windings that would generate trifans */
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FixWinding( w );
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}
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/* set side winding */
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side->winding = w;
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}
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/* find brush bounds */
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return BoundBrush( brush );
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}
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/*
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==================
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BrushFromBounds
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Creates a new axial brush
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==================
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*/
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brush_t *BrushFromBounds (vec3_t mins, vec3_t maxs)
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{
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brush_t *b;
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int i;
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vec3_t normal;
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vec_t dist;
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b = AllocBrush (6);
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b->numsides = 6;
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for (i=0 ; i<3 ; i++)
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{
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VectorClear (normal);
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normal[i] = 1;
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dist = maxs[i];
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b->sides[i].planenum = FindFloatPlane (normal, dist, 1, (vec3_t*) &maxs );
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normal[i] = -1;
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dist = -mins[i];
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b->sides[3+i].planenum = FindFloatPlane (normal, dist, 1, (vec3_t*) &mins );
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}
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CreateBrushWindings (b);
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return b;
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}
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/*
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==================
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BrushVolume
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==================
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*/
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vec_t BrushVolume (brush_t *brush)
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{
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int i;
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winding_t *w;
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vec3_t corner;
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vec_t d, area, volume;
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plane_t *plane;
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if (!brush)
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return 0;
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// grab the first valid point as the corner
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w = NULL;
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for (i=0 ; i<brush->numsides ; i++)
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{
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w = brush->sides[i].winding;
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if (w)
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break;
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}
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if (!w)
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return 0;
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VectorCopy (w->p[0], corner);
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// make tetrahedrons to all other faces
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volume = 0;
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for ( ; i<brush->numsides ; i++)
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{
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w = brush->sides[i].winding;
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if (!w)
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continue;
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plane = &mapplanes[brush->sides[i].planenum];
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d = -(DotProduct (corner, plane->normal) - plane->dist);
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area = WindingArea (w);
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volume += d*area;
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}
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volume /= 3;
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return volume;
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}
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/*
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WriteBSPBrushMap()
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writes a map with the split bsp brushes
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*/
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void WriteBSPBrushMap( char *name, brush_t *list )
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{
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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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/* note it */
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Sys_Printf( "Writing %s\n", name );
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/* open the map file */
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f = fopen( name, "wb" );
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if( f == NULL )
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Error( "Can't write %s\b", name );
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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, "notexture 0 0 0 1 1\n" );
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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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FilterBrushIntoTree_r()
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adds brush reference to any intersecting bsp leafnode
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*/
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int FilterBrushIntoTree_r( brush_t *b, node_t *node )
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{
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brush_t *front, *back;
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int c;
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/* dummy check */
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if( b == NULL )
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return 0;
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/* add it to the leaf list */
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if( node->planenum == PLANENUM_LEAF )
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{
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/* something somewhere is hammering brushlist */
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b->next = node->brushlist;
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node->brushlist = b;
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/* classify the leaf by the structural brush */
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if( !b->detail )
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{
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if( b->opaque )
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{
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node->opaque = qtrue;
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node->areaportal = qfalse;
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}
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else if( b->compileFlags & C_AREAPORTAL )
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{
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if( !node->opaque )
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node->areaportal = qtrue;
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}
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}
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return 1;
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}
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/* split it by the node plane */
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c = b->numsides;
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SplitBrush( b, node->planenum, &front, &back );
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FreeBrush( b );
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c = 0;
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c += FilterBrushIntoTree_r( front, node->children[ 0 ] );
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c += FilterBrushIntoTree_r( back, node->children[ 1 ] );
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return c;
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}
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/*
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FilterDetailBrushesIntoTree
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fragment all the detail brushes into the structural leafs
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*/
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void FilterDetailBrushesIntoTree( entity_t *e, tree_t *tree )
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{
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brush_t *b, *newb;
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int r;
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int c_unique, c_clusters;
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int i;
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/* note it */
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Sys_FPrintf( SYS_VRB, "--- FilterDetailBrushesIntoTree ---\n" );
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/* walk the list of brushes */
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c_unique = 0;
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c_clusters = 0;
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for( b = e->brushes; b; b = b->next )
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{
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if( !b->detail )
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continue;
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c_unique++;
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newb = CopyBrush( b );
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|
r = FilterBrushIntoTree_r( newb, tree->headnode );
|
|
c_clusters += r;
|
|
|
|
/* mark all sides as visible so drawsurfs are created */
|
|
if( r )
|
|
{
|
|
for( i = 0; i < b->numsides; i++ )
|
|
{
|
|
if( b->sides[ i ].winding )
|
|
b->sides[ i ].visible = qtrue;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* emit some statistics */
|
|
Sys_FPrintf( SYS_VRB, "%9d detail brushes\n", c_unique );
|
|
Sys_FPrintf( SYS_VRB, "%9d cluster references\n", c_clusters );
|
|
}
|
|
|
|
/*
|
|
=====================
|
|
FilterStructuralBrushesIntoTree
|
|
|
|
Mark the leafs as opaque and areaportals
|
|
=====================
|
|
*/
|
|
void FilterStructuralBrushesIntoTree( entity_t *e, tree_t *tree ) {
|
|
brush_t *b, *newb;
|
|
int r;
|
|
int c_unique, c_clusters;
|
|
int i;
|
|
|
|
Sys_FPrintf (SYS_VRB, "--- FilterStructuralBrushesIntoTree ---\n");
|
|
|
|
c_unique = 0;
|
|
c_clusters = 0;
|
|
for ( b = e->brushes ; b ; b = b->next ) {
|
|
if ( b->detail ) {
|
|
continue;
|
|
}
|
|
c_unique++;
|
|
newb = CopyBrush( b );
|
|
r = FilterBrushIntoTree_r( newb, tree->headnode );
|
|
c_clusters += r;
|
|
|
|
// mark all sides as visible so drawsurfs are created
|
|
if ( r ) {
|
|
for ( i = 0 ; i < b->numsides ; i++ ) {
|
|
if ( b->sides[i].winding ) {
|
|
b->sides[i].visible = qtrue;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* emit some statistics */
|
|
Sys_FPrintf( SYS_VRB, "%9d structural brushes\n", c_unique );
|
|
Sys_FPrintf( SYS_VRB, "%9d cluster references\n", c_clusters );
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
================
|
|
AllocTree
|
|
================
|
|
*/
|
|
tree_t *AllocTree (void)
|
|
{
|
|
tree_t *tree;
|
|
|
|
tree = safe_malloc(sizeof(*tree));
|
|
memset (tree, 0, sizeof(*tree));
|
|
ClearBounds (tree->mins, tree->maxs);
|
|
|
|
return tree;
|
|
}
|
|
|
|
/*
|
|
================
|
|
AllocNode
|
|
================
|
|
*/
|
|
node_t *AllocNode (void)
|
|
{
|
|
node_t *node;
|
|
|
|
node = safe_malloc(sizeof(*node));
|
|
memset (node, 0, sizeof(*node));
|
|
|
|
return node;
|
|
}
|
|
|
|
|
|
/*
|
|
================
|
|
WindingIsTiny
|
|
|
|
Returns true if the winding would be crunched out of
|
|
existance by the vertex snapping.
|
|
================
|
|
*/
|
|
#define EDGE_LENGTH 0.2
|
|
qboolean WindingIsTiny (winding_t *w)
|
|
{
|
|
/*
|
|
if (WindingArea (w) < 1)
|
|
return qtrue;
|
|
return qfalse;
|
|
*/
|
|
int i, j;
|
|
vec_t len;
|
|
vec3_t delta;
|
|
int edges;
|
|
|
|
edges = 0;
|
|
for (i=0 ; i<w->numpoints ; i++)
|
|
{
|
|
j = i == w->numpoints - 1 ? 0 : i+1;
|
|
VectorSubtract (w->p[j], w->p[i], delta);
|
|
len = VectorLength (delta);
|
|
if (len > EDGE_LENGTH)
|
|
{
|
|
if (++edges == 3)
|
|
return qfalse;
|
|
}
|
|
}
|
|
return qtrue;
|
|
}
|
|
|
|
/*
|
|
================
|
|
WindingIsHuge
|
|
|
|
Returns true if the winding still has one of the points
|
|
from basewinding for plane
|
|
================
|
|
*/
|
|
qboolean WindingIsHuge (winding_t *w)
|
|
{
|
|
int i, j;
|
|
|
|
for (i=0 ; i<w->numpoints ; i++)
|
|
{
|
|
for (j=0 ; j<3 ; j++)
|
|
if (w->p[i][j] <= MIN_WORLD_COORD || w->p[i][j] >= MAX_WORLD_COORD)
|
|
return qtrue;
|
|
}
|
|
return qfalse;
|
|
}
|
|
|
|
//============================================================
|
|
|
|
/*
|
|
==================
|
|
BrushMostlyOnSide
|
|
|
|
==================
|
|
*/
|
|
int BrushMostlyOnSide (brush_t *brush, plane_t *plane)
|
|
{
|
|
int i, j;
|
|
winding_t *w;
|
|
vec_t d, max;
|
|
int side;
|
|
|
|
max = 0;
|
|
side = PSIDE_FRONT;
|
|
for (i=0 ; i<brush->numsides ; i++)
|
|
{
|
|
w = brush->sides[i].winding;
|
|
if (!w)
|
|
continue;
|
|
for (j=0 ; j<w->numpoints ; j++)
|
|
{
|
|
d = DotProduct (w->p[j], plane->normal) - plane->dist;
|
|
if (d > max)
|
|
{
|
|
max = d;
|
|
side = PSIDE_FRONT;
|
|
}
|
|
if (-d > max)
|
|
{
|
|
max = -d;
|
|
side = PSIDE_BACK;
|
|
}
|
|
}
|
|
}
|
|
return side;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
SplitBrush()
|
|
generates two new brushes, leaving the original unchanged
|
|
*/
|
|
|
|
void SplitBrush( brush_t *brush, int planenum, brush_t **front, brush_t **back )
|
|
{
|
|
brush_t *b[2];
|
|
int i, j;
|
|
winding_t *w, *cw[2], *midwinding;
|
|
plane_t *plane, *plane2;
|
|
side_t *s, *cs;
|
|
float d, d_front, d_back;
|
|
|
|
|
|
*front = NULL;
|
|
*back = NULL;
|
|
plane = &mapplanes[planenum];
|
|
|
|
// check all points
|
|
d_front = d_back = 0;
|
|
for (i=0 ; i<brush->numsides ; i++)
|
|
{
|
|
w = brush->sides[i].winding;
|
|
if (!w)
|
|
continue;
|
|
for (j=0 ; j<w->numpoints ; j++)
|
|
{
|
|
d = DotProduct (w->p[j], plane->normal) - plane->dist;
|
|
if (d > 0 && d > d_front)
|
|
d_front = d;
|
|
if (d < 0 && d < d_back)
|
|
d_back = d;
|
|
}
|
|
}
|
|
|
|
if (d_front < 0.1) // PLANESIDE_EPSILON)
|
|
{ // only on back
|
|
*back = CopyBrush( brush );
|
|
return;
|
|
}
|
|
|
|
if (d_back > -0.1) // PLANESIDE_EPSILON)
|
|
{ // only on front
|
|
*front = CopyBrush( brush );
|
|
return;
|
|
}
|
|
|
|
// create a new winding from the split plane
|
|
w = BaseWindingForPlane (plane->normal, plane->dist);
|
|
for (i=0 ; i<brush->numsides && w ; i++)
|
|
{
|
|
plane2 = &mapplanes[brush->sides[i].planenum ^ 1];
|
|
ChopWindingInPlace (&w, plane2->normal, plane2->dist, 0); // PLANESIDE_EPSILON);
|
|
}
|
|
|
|
if (!w || WindingIsTiny (w) )
|
|
{ // the brush isn't really split
|
|
int side;
|
|
|
|
side = BrushMostlyOnSide (brush, plane);
|
|
if (side == PSIDE_FRONT)
|
|
*front = CopyBrush (brush);
|
|
if (side == PSIDE_BACK)
|
|
*back = CopyBrush (brush);
|
|
return;
|
|
}
|
|
|
|
if( WindingIsHuge( w ) )
|
|
Sys_FPrintf( SYS_VRB,"WARNING: huge winding\n" );
|
|
|
|
midwinding = w;
|
|
|
|
// split it for real
|
|
|
|
for (i=0 ; i<2 ; i++)
|
|
{
|
|
b[i] = AllocBrush (brush->numsides+1);
|
|
memcpy( b[i], brush, sizeof( brush_t ) - sizeof( brush->sides ) );
|
|
b[i]->numsides = 0;
|
|
b[i]->next = NULL;
|
|
b[i]->original = brush->original;
|
|
}
|
|
|
|
// split all the current windings
|
|
|
|
for (i=0 ; i<brush->numsides ; i++)
|
|
{
|
|
s = &brush->sides[i];
|
|
w = s->winding;
|
|
if (!w)
|
|
continue;
|
|
ClipWindingEpsilon (w, plane->normal, plane->dist,
|
|
0 /*PLANESIDE_EPSILON*/, &cw[0], &cw[1]);
|
|
for (j=0 ; j<2 ; j++)
|
|
{
|
|
if (!cw[j])
|
|
continue;
|
|
cs = &b[j]->sides[b[j]->numsides];
|
|
b[j]->numsides++;
|
|
*cs = *s;
|
|
cs->winding = cw[j];
|
|
}
|
|
}
|
|
|
|
|
|
// see if we have valid polygons on both sides
|
|
for (i=0 ; i<2 ; i++)
|
|
{
|
|
if (b[i]->numsides < 3 || !BoundBrush (b[i]))
|
|
{
|
|
if (b[i]->numsides >= 3)
|
|
Sys_FPrintf (SYS_VRB,"bogus brush after clip\n");
|
|
FreeBrush (b[i]);
|
|
b[i] = NULL;
|
|
}
|
|
}
|
|
|
|
if ( !(b[0] && b[1]) )
|
|
{
|
|
if (!b[0] && !b[1])
|
|
Sys_FPrintf (SYS_VRB,"split removed brush\n");
|
|
else
|
|
Sys_FPrintf (SYS_VRB,"split not on both sides\n");
|
|
if (b[0])
|
|
{
|
|
FreeBrush (b[0]);
|
|
*front = CopyBrush (brush);
|
|
}
|
|
if (b[1])
|
|
{
|
|
FreeBrush (b[1]);
|
|
*back = CopyBrush (brush);
|
|
}
|
|
return;
|
|
}
|
|
|
|
// add the midwinding to both sides
|
|
for (i=0 ; i<2 ; i++)
|
|
{
|
|
cs = &b[i]->sides[b[i]->numsides];
|
|
b[i]->numsides++;
|
|
|
|
cs->planenum = planenum^i^1;
|
|
cs->shaderInfo = NULL;
|
|
if (i==0)
|
|
cs->winding = CopyWinding (midwinding);
|
|
else
|
|
cs->winding = midwinding;
|
|
}
|
|
|
|
{
|
|
vec_t v1;
|
|
int i;
|
|
|
|
|
|
for (i=0 ; i<2 ; i++)
|
|
{
|
|
v1 = BrushVolume (b[i]);
|
|
if (v1 < 1.0)
|
|
{
|
|
FreeBrush (b[i]);
|
|
b[i] = NULL;
|
|
// Sys_FPrintf (SYS_VRB,"tiny volume after clip\n");
|
|
}
|
|
}
|
|
}
|
|
|
|
*front = b[0];
|
|
*back = b[1];
|
|
}
|