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https://github.com/UberGames/lilium-voyager.git
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861 lines
15 KiB
C
861 lines
15 KiB
C
/*
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===========================================================================
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Copyright (C) 1999-2005 Id Software, Inc.
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This file is part of Quake III Arena source code.
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Quake III Arena source code is free software; you can redistribute it
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and/or modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the License,
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or (at your option) any later version.
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Quake III Arena source code is distributed in the hope that it will be
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useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Foobar; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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===========================================================================
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*/
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#include "qbsp.h"
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int c_active_brushes;
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int c_nodes;
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// if a brush just barely pokes onto the other side,
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// let it slide by without chopping
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#define PLANESIDE_EPSILON 0.001
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//0.1
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/*
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================
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CountBrushList
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================
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*/
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int CountBrushList (bspbrush_t *brushes)
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{
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int c;
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c = 0;
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for ( ; brushes ; 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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================
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AllocBrush
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================
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*/
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bspbrush_t *AllocBrush (int numsides)
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{
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bspbrush_t *bb;
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int c;
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c = (int)&(((bspbrush_t *)0)->sides[numsides]);
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bb = malloc(c);
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memset (bb, 0, c);
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if (numthreads == 1)
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c_active_brushes++;
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return bb;
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}
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/*
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================
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FreeBrush
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================
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*/
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void FreeBrush (bspbrush_t *brushes)
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{
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int i;
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for (i=0 ; i<brushes->numsides ; i++)
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if (brushes->sides[i].winding)
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FreeWinding(brushes->sides[i].winding);
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free (brushes);
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if (numthreads == 1)
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c_active_brushes--;
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}
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/*
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================
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FreeBrushList
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================
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*/
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void FreeBrushList (bspbrush_t *brushes)
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{
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bspbrush_t *next;
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for ( ; brushes ; 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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==================
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CopyBrush
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Duplicates the brush, the sides, and the windings
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==================
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*/
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bspbrush_t *CopyBrush (bspbrush_t *brush)
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{
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bspbrush_t *newbrush;
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int size;
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int i;
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size = (int)&(((bspbrush_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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for (i=0 ; i<brush->numsides ; i++)
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{
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if (brush->sides[i].winding)
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newbrush->sides[i].winding = CopyWinding (brush->sides[i].winding);
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}
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return newbrush;
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}
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/*
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================
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DrawBrushList
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================
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*/
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void DrawBrushList (bspbrush_t *brush)
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{
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int i;
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side_t *s;
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GLS_BeginScene ();
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for ( ; brush ; brush=brush->next)
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{
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for (i=0 ; i<brush->numsides ; i++)
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{
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s = &brush->sides[i];
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if (!s->winding)
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continue;
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GLS_Winding (s->winding, 0);
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}
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}
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GLS_EndScene ();
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}
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/*
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================
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WriteBrushList
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================
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*/
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void WriteBrushList (char *name, bspbrush_t *brush, qboolean onlyvis)
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{
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int i;
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side_t *s;
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FILE *f;
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qprintf ("writing %s\n", name);
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f = SafeOpenWrite (name);
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for ( ; brush ; brush=brush->next)
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{
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for (i=0 ; i<brush->numsides ; i++)
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{
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s = &brush->sides[i];
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if (!s->winding)
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continue;
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if (onlyvis && !s->visible)
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continue;
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OutputWinding (brush->sides[i].winding, f);
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}
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}
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fclose (f);
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}
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/*
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=============
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PrintBrush
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=============
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*/
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void PrintBrush (bspbrush_t *brush)
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{
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int i;
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_printf ("brush: %p\n", brush);
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for (i=0;i<brush->numsides ; i++)
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{
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pw(brush->sides[i].winding);
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_printf ("\n");
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}
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}
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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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*/
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qboolean BoundBrush (bspbrush_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)
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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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if (brush->mins[i] < MIN_WORLD_COORD || brush->maxs[i] > MAX_WORLD_COORD
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|| brush->mins[i] >= brush->maxs[i] ) {
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return qfalse;
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}
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}
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return qtrue;
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}
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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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*/
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qboolean CreateBrushWindings (bspbrush_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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for ( i = 0; i < brush->numsides; i++ )
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{
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side = &brush->sides[i];
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// don't create a winding for a bevel
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if ( side->bevel ) {
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continue;
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}
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plane = &mapplanes[side->planenum];
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w = BaseWindingForPlane (plane->normal, plane->dist);
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for ( j = 0; j < brush->numsides && w; 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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if (brush->sides[j].backSide)
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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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}
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// free any existing winding
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if ( side->winding ) {
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FreeWinding( side->winding );
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}
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side->winding = w;
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}
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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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bspbrush_t *BrushFromBounds (vec3_t mins, vec3_t maxs)
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{
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bspbrush_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);
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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);
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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 (bspbrush_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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==================
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WriteBspBrushMap
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==================
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*/
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void WriteBspBrushMap (char *name, bspbrush_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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_printf ("writing %s\n", name);
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f = fopen (name, "wb");
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if (!f)
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Error ("Can't write %s\b", name);
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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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/*
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====================
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FilterBrushIntoTree_r
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====================
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*/
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int FilterBrushIntoTree_r( bspbrush_t *b, node_t *node ) {
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bspbrush_t *front, *back;
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int c;
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if ( !b ) {
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return 0;
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}
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// add it to the leaf list
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if ( node->planenum == PLANENUM_LEAF ) {
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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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if ( b->opaque ) {
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node->opaque = qtrue;
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node->areaportal = qfalse;
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} else if ( b->contents & CONTENTS_AREAPORTAL ) {
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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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}
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return 1;
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}
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// split it by the node plane
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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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=====================
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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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*/
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void FilterDetailBrushesIntoTree( entity_t *e, tree_t *tree ) {
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bspbrush_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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qprintf( "----- FilterDetailBrushesIntoTree -----\n");
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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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if ( !b->detail ) {
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continue;
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}
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c_unique++;
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newb = CopyBrush( b );
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r = FilterBrushIntoTree_r( newb, tree->headnode );
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c_clusters += r;
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// mark all sides as visible so drawsurfs are created
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if ( r ) {
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for ( i = 0 ; i < b->numsides ; i++ ) {
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if ( b->sides[i].winding ) {
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b->sides[i].visible = qtrue;
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}
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}
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}
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}
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qprintf( "%5i detail brushes\n", c_unique );
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qprintf( "%5i cluster references\n", c_clusters );
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}
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/*
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=====================
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FilterStructuralBrushesIntoTree
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Mark the leafs as opaque and areaportals
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=====================
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*/
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void FilterStructuralBrushesIntoTree( entity_t *e, tree_t *tree ) {
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bspbrush_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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qprintf( "----- FilterStructuralBrushesIntoTree -----\n");
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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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if ( b->detail ) {
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continue;
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}
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c_unique++;
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newb = CopyBrush( b );
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r = FilterBrushIntoTree_r( newb, tree->headnode );
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c_clusters += r;
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// mark all sides as visible so drawsurfs are created
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if ( r ) {
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for ( i = 0 ; i < b->numsides ; i++ ) {
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if ( b->sides[i].winding ) {
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b->sides[i].visible = qtrue;
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}
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}
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}
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}
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qprintf( "%5i structural brushes\n", c_unique );
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qprintf( "%5i cluster references\n", c_clusters );
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}
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/*
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================
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AllocTree
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================
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*/
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tree_t *AllocTree (void)
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{
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tree_t *tree;
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tree = malloc(sizeof(*tree));
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memset (tree, 0, sizeof(*tree));
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ClearBounds (tree->mins, tree->maxs);
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return tree;
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}
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/*
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================
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AllocNode
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================
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*/
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node_t *AllocNode (void)
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{
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node_t *node;
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node = malloc(sizeof(*node));
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memset (node, 0, sizeof(*node));
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return node;
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}
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/*
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================
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WindingIsTiny
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Returns true if the winding would be crunched out of
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existance by the vertex snapping.
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================
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*/
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#define EDGE_LENGTH 0.2
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qboolean WindingIsTiny (winding_t *w)
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{
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/*
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if (WindingArea (w) < 1)
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return qtrue;
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return qfalse;
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*/
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int i, j;
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vec_t len;
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vec3_t delta;
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int edges;
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edges = 0;
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for (i=0 ; i<w->numpoints ; i++)
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{
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j = i == w->numpoints - 1 ? 0 : i+1;
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VectorSubtract (w->p[j], w->p[i], delta);
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len = VectorLength (delta);
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if (len > EDGE_LENGTH)
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{
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if (++edges == 3)
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return qfalse;
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}
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}
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return qtrue;
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}
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|
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/*
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================
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WindingIsHuge
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Returns true if the winding still has one of the points
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from basewinding for plane
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================
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*/
|
|
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 (bspbrush_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 (bspbrush_t *brush, int planenum,
|
|
bspbrush_t **front, bspbrush_t **back)
|
|
{
|
|
bspbrush_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 = *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++)
|
|
{
|
|
if ( brush->sides[i].backSide ) {
|
|
continue; // fake back-sided polygons never split
|
|
}
|
|
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))
|
|
{
|
|
qprintf ("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( bspbrush_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;
|
|
/*
|
|
if (WindingIsTiny (cw[j]))
|
|
{
|
|
FreeWinding (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++)
|
|
{
|
|
BoundBrush (b[i]);
|
|
for (j=0 ; j<3 ; j++)
|
|
{
|
|
if (b[i]->mins[j] < MIN_WORLD_COORD || b[i]->maxs[j] > MAX_WORLD_COORD)
|
|
{
|
|
qprintf ("bogus brush after clip\n");
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (b[i]->numsides < 3 || j < 3)
|
|
{
|
|
FreeBrush (b[i]);
|
|
b[i] = NULL;
|
|
}
|
|
}
|
|
|
|
if ( !(b[0] && b[1]) )
|
|
{
|
|
if (!b[0] && !b[1])
|
|
qprintf ("split removed brush\n");
|
|
else
|
|
qprintf ("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;
|
|
// qprintf ("tiny volume after clip\n");
|
|
}
|
|
}
|
|
}
|
|
|
|
*front = b[0];
|
|
*back = b[1];
|
|
}
|