982 lines
21 KiB
C++
982 lines
21 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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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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/* 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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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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}
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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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int c = 0;
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/* count brushes */
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for ( ; 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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return safe_calloc( offsetof_array( brush_t, sides, numSides ) );
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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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int i;
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/* error check */
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if ( *( (unsigned int*) b ) == 0xFEFEFEFE ) {
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Sys_FPrintf( SYS_WRN | SYS_VRBflag, "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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}
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/* ydnar: overwrite it */
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memset( b, 0xFE, offsetof_array( brush_t, sides, b->numsides ) );
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*( (unsigned int*) b ) = 0xFEFEFEFE;
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/* free it */
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free( b );
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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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brush_t *next;
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/* walk brush list */
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for ( ; 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( const brush_t *brush ){
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/* copy brush */
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brush_t *newBrush = AllocBrush( brush->numsides );
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memcpy( newBrush, brush, offsetof_array( brush_t, sides, brush->numsides ) );
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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 ( int 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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}
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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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bool BoundBrush( brush_t *brush ){
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brush->minmax.clear();
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for ( int i = 0; i < brush->numsides; i++ )
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{
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const winding_t *w = brush->sides[ i ].winding;
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if ( w != NULL ) {
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WindingExtendBounds( *w, brush->minmax );
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}
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}
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return brush->minmax.valid() && c_worldMinmax.surrounds( brush->minmax );
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}
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/*
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SnapWeldVector() - ydnar
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welds two Vector3'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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Vector3 SnapWeldVector( const Vector3& a, const Vector3& b ){
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Vector3 out;
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/* do each element */
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for ( int i = 0; i < 3; i++ )
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{
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/* round to integer */
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const float ai = std::rint( a[ i ] );
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const float bi = std::rint( b[ 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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}
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else if ( bi == b[ i ] ) {
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out[ i ] = b[ i ];
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}
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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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}
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else{
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out[ i ] = b[ i ];
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}
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/* snap */
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const float outi = std::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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return out;
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}
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/*
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==================
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SnapWeldVectorAccu
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Welds two vectors into a third, taking into account nearest-to-integer
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instead of averaging.
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==================
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*/
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DoubleVector3 SnapWeldVectorAccu( const DoubleVector3& a, const DoubleVector3& b ){
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// I'm just preserving what I think was the intended logic of the original
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// SnapWeldVector(). I'm not actually sure where this function should even
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// be used. I'd like to know which kinds of problems this function addresses.
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// TODO: I thought we're snapping all coordinates to nearest 1/8 unit?
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// So what is natural about snapping to the nearest integer? Maybe we should
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// be snapping to the nearest 1/8 unit instead?
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DoubleVector3 out;
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for ( int i = 0; i < 3; i++ )
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{
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const double ai = std::rint( a[i] );
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const double bi = std::rint( b[i] );
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const double ad = fabs( ai - a[i] );
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const double bd = fabs( bi - b[i] );
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if ( ad < bd ) {
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if ( ad < SNAP_EPSILON ) {
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out[i] = ai;
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}
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else{
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out[i] = a[i];
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}
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}
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else
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{
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if ( bd < SNAP_EPSILON ) {
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out[i] = bi;
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}
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else{
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out[i] = b[i];
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}
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}
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}
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return out;
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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 true if the winding is valid
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*/
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#define DEGENERATE_EPSILON 0.1
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bool FixWinding( winding_t *w ){
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bool valid = true;
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/* dummy check */
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if ( !w ) {
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return false;
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}
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/* check all verts */
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for ( winding_t::iterator i = w->end() - 1, j = w->begin(); j != w->end(); i = j, ++j )
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{
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/* don't remove points if winding is a triangle */
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if ( w->size() == 3 ) {
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return valid;
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}
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/* degenerate edge? */
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if ( vector3_length( *i - *j ) < DEGENERATE_EPSILON ) {
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valid = false;
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//Sys_FPrintf( SYS_WRN | SYS_VRBflag, "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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*i = SnapWeldVector( *i, *j );
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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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w->erase( j );
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}
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}
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/* one last check and return */
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if ( w->size() < 3 ) {
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valid = false;
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}
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return valid;
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}
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/*
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==================
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FixWindingAccu
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Removes degenerate edges (edges that are too short) from a winding.
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Returns true if the winding has been altered by this function.
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Returns false if the winding is untouched by this function.
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It's advised that you check the winding after this function exits to make
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sure it still has at least 3 points. If that is not the case, the winding
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cannot be considered valid. The winding may degenerate to one or two points
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if the some of the winding's points are close together.
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==================
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*/
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bool FixWindingAccu( winding_accu_t& w ){
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bool altered = false;
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while ( true )
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{
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if ( w.size() < 2 ) {
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break; // Don't remove the only remaining point.
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}
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bool done = true;
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for ( winding_accu_t::iterator i = w.end() - 1, j = w.begin(); j != w.end(); i = j, ++j )
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{
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if ( vector3_length( *i - *j ) < DEGENERATE_EPSILON ) {
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// TODO: I think the "snap weld vector" was written before
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// some of the math precision fixes, and its purpose was
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// probably to address math accuracy issues. We can think
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// about changing the logic here. Maybe once plane distance
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// gets 64 bits, we can look at it then.
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*i = SnapWeldVectorAccu( *i, *j );
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w.erase( j );
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altered = true;
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// The only way to finish off fixing the winding consistently and
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// accurately is by fixing the winding all over again. For example,
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// the point at index i and the point at index i-1 could now be
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// less than the epsilon distance apart. There are too many special
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// case problems we'd need to handle if we didn't start from the
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// beginning.
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done = false;
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break; // This will cause us to return to the "while" loop.
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}
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}
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if ( done ) {
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break;
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}
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}
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return altered;
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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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bool CreateBrushWindings( brush_t *brush ){
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/* walk the list of brush sides */
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for ( int i = 0; i < brush->numsides; i++ )
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{
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/* get side and plane */
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side_t& side = brush->sides[ i ];
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const plane_t& plane = mapplanes[ side.planenum ];
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/* make huge winding */
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#if Q3MAP2_EXPERIMENTAL_HIGH_PRECISION_MATH_FIXES
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winding_accu_t w = BaseWindingForPlaneAccu( ( side.plane.normal() != g_vector3_identity )? side.plane : Plane3( plane.plane ) );
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#else
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winding_t *w = BaseWindingForPlane( plane.plane );
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#endif
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/* walk the list of brush sides */
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for ( int j = 0; j < brush->numsides && !w.empty(); j++ )
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{
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const side_t& cside = brush->sides[ j ];
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const plane_t& cplane = mapplanes[ cside.planenum ^ 1 ];
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if ( i == j
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|| cside.planenum == ( side.planenum ^ 1 ) /* back side clipaway */
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|| cside.bevel ) {
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continue;
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}
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#if Q3MAP2_EXPERIMENTAL_HIGH_PRECISION_MATH_FIXES
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ChopWindingInPlaceAccu( w, ( cside.plane.normal() != g_vector3_identity )? plane3_flipped( cside.plane ) : Plane3( cplane.plane ), 0 );
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#else
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ChopWindingInPlace( w, cplane.plane, 0 ); // CLIP_EPSILON );
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#endif
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/* ydnar: fix broken windings that would generate trifans */
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#if Q3MAP2_EXPERIMENTAL_HIGH_PRECISION_MATH_FIXES
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// I think it's better to FixWindingAccu() once after we chop with all planes
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// so that error isn't multiplied. There is nothing natural about welding
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// the points unless they are the final endpoints. ChopWindingInPlaceAccu()
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// is able to handle all kinds of degenerate windings.
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#else
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FixWinding( w );
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#endif
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}
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/* set side winding */
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#if Q3MAP2_EXPERIMENTAL_HIGH_PRECISION_MATH_FIXES
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FixWindingAccu( w );
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side.winding = ( w.size() >= 3 ? CopyWindingAccuToRegular( w ) : NULL );
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#else
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side.winding = w;
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#endif
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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( const Vector3& mins, const Vector3& maxs ){
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brush_t *b;
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int i;
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float 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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dist = maxs[i];
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b->sides[i].planenum = FindFloatPlane( g_vector3_axes[i], dist, 1, &maxs );
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dist = -mins[i];
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b->sides[3 + i].planenum = FindFloatPlane( -g_vector3_axes[i], dist, 1, &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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float BrushVolume( brush_t *brush ){
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int i;
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const winding_t *w;
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Vector3 corner;
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float volume;
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if ( !brush ) {
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return 0;
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}
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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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}
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if ( !w ) {
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return 0;
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}
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corner = ( *w )[0];
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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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}
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volume += -plane3_distance_to_point( mapplanes[brush->sides[i].planenum].plane, corner ) * WindingArea( *w );
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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( const char *name, brush_t *list ){
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side_t *s;
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int i;
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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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FILE *f = SafeOpenWrite( 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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// TODO: See if we can use a smaller winding to prevent resolution loss.
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// Is WriteBSPBrushMap() used only to decompile maps?
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winding_t *w = BaseWindingForPlane( mapplanes[s->planenum].plane );
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const winding_t& wr = *w;
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fprintf( f, "( %i %i %i ) ", (int)wr[0][0], (int)wr[0][1], (int)wr[0][2] );
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fprintf( f, "( %i %i %i ) ", (int)wr[1][0], (int)wr[1][1], (int)wr[1][2] );
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fprintf( f, "( %i %i %i ) ", (int)wr[2][0], (int)wr[2][1], (int)wr[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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|
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int FilterBrushIntoTree_r( brush_t *b, node_t *node ){
|
|
brush_t *front, *back;
|
|
int c;
|
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|
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|
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/* dummy check */
|
|
if ( b == NULL ) {
|
|
return 0;
|
|
}
|
|
|
|
/* add it to the leaf list */
|
|
if ( node->planenum == PLANENUM_LEAF ) {
|
|
/* something somewhere is hammering brushlist */
|
|
b->next = node->brushlist;
|
|
node->brushlist = b;
|
|
|
|
/* classify the leaf by the structural brush */
|
|
if ( !b->detail ) {
|
|
if ( b->opaque ) {
|
|
node->opaque = true;
|
|
node->areaportal = false;
|
|
}
|
|
else if ( b->compileFlags & C_AREAPORTAL ) {
|
|
if ( !node->opaque ) {
|
|
node->areaportal = true;
|
|
}
|
|
}
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
/* split it by the node plane */
|
|
c = b->numsides;
|
|
SplitBrush( b, node->planenum, &front, &back );
|
|
FreeBrush( b );
|
|
|
|
c = 0;
|
|
c += FilterBrushIntoTree_r( front, node->children[ 0 ] );
|
|
c += FilterBrushIntoTree_r( back, node->children[ 1 ] );
|
|
|
|
return c;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
FilterDetailBrushesIntoTree
|
|
fragment all the detail brushes into the structural leafs
|
|
*/
|
|
|
|
void FilterDetailBrushesIntoTree( entity_t *e, tree_t *tree ){
|
|
brush_t *b, *newb;
|
|
int r;
|
|
int c_unique, c_clusters;
|
|
int i;
|
|
|
|
|
|
/* note it */
|
|
Sys_FPrintf( SYS_VRB, "--- FilterDetailBrushesIntoTree ---\n" );
|
|
|
|
/* walk the list of brushes */
|
|
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 = true;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* 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 = true;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* 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 = safe_calloc( sizeof( *tree ) );
|
|
tree->minmax.clear();
|
|
return tree;
|
|
}
|
|
|
|
/*
|
|
================
|
|
AllocNode
|
|
================
|
|
*/
|
|
node_t *AllocNode( void ){
|
|
return safe_calloc( sizeof( node_t ) );
|
|
}
|
|
|
|
|
|
/*
|
|
================
|
|
WindingIsTiny
|
|
|
|
Returns true if the winding would be crunched out of
|
|
existence by the vertex snapping.
|
|
================
|
|
*/
|
|
#define EDGE_LENGTH 0.2
|
|
bool WindingIsTiny( const winding_t& w ){
|
|
/*
|
|
if (WindingArea (w) < 1)
|
|
return true;
|
|
return false;
|
|
*/
|
|
int edges = 0;
|
|
|
|
for ( size_t i = w.size() - 1, j = 0; j < w.size(); i = j, ++j )
|
|
{
|
|
if ( vector3_length( w[j] - w[i] ) > EDGE_LENGTH ) {
|
|
if ( ++edges == 3 ) {
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
================
|
|
WindingIsHuge
|
|
|
|
Returns true if the winding still has one of the points
|
|
from basewinding for plane
|
|
================
|
|
*/
|
|
bool WindingIsHuge( const winding_t& w ){
|
|
for ( const Vector3& p : w )
|
|
if ( !c_worldMinmax.test( p ) )
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
//============================================================
|
|
|
|
/*
|
|
==================
|
|
BrushMostlyOnSide
|
|
|
|
==================
|
|
*/
|
|
int BrushMostlyOnSide( brush_t *brush, plane_t *plane ){
|
|
float max = 0;
|
|
int side = PSIDE_FRONT;
|
|
for ( int i = 0 ; i < brush->numsides ; i++ )
|
|
{
|
|
winding_t *w = brush->sides[i].winding;
|
|
if ( w ) {
|
|
for ( const Vector3& p : *w )
|
|
{
|
|
const double d = plane3_distance_to_point( plane->plane, p );
|
|
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_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 ( const Vector3& p : *w )
|
|
{
|
|
const float d = plane3_distance_to_point( plane->plane, p );
|
|
if ( d > 0 ) {
|
|
value_maximize( d_front, d );
|
|
}
|
|
if ( d < 0 ) {
|
|
value_minimize( 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->plane );
|
|
for ( i = 0 ; i < brush->numsides && w ; i++ )
|
|
{
|
|
plane2 = &mapplanes[brush->sides[i].planenum ^ 1];
|
|
ChopWindingInPlace( w, plane2->plane, 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_WRN | SYS_VRBflag, "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 ) );
|
|
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;
|
|
}
|
|
ClipWindingEpsilonStrict( *w, plane->plane,
|
|
0 /*PLANESIDE_EPSILON*/, cw[0], cw[1] ); /* strict, in parallel case we get the face back because it also is the midwinding */
|
|
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_WRN | SYS_VRBflag, "bogus brush after clip\n" );
|
|
}
|
|
FreeBrush( b[i] );
|
|
b[i] = NULL;
|
|
}
|
|
}
|
|
|
|
if ( !( b[0] && b[1] ) ) {
|
|
if ( !b[0] && !b[1] ) {
|
|
Sys_FPrintf( SYS_WRN | SYS_VRBflag, "split removed brush\n" );
|
|
}
|
|
else{
|
|
Sys_FPrintf( SYS_WRN | SYS_VRBflag, "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;
|
|
}
|
|
}
|
|
|
|
{
|
|
float 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_WRN | SYS_VRBflag, "tiny volume after clip\n" );
|
|
}
|
|
}
|
|
}
|
|
|
|
*front = b[0];
|
|
*back = b[1];
|
|
}
|