quakeforge/tools/qfbsp/source/csg4.c

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/*
Copyright (C) 1996-1997 Id Software, Inc.
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This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
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This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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See file, 'COPYING', for details.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
static __attribute__ ((used)) const char rcsid[] =
"$Id$";
#ifdef HAVE_STRING_H
# include <string.h>
#endif
#include "QF/sys.h"
#include "brush.h"
#include "bsp5.h"
#include "csg4.h"
#include "draw.h"
#include "merge.h"
#include "solidbsp.h"
#include "surfaces.h"
/** \addtogroup qfbsp_csg4
*/
//@{
/*
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NOTES
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Brushes that touch still need to be split at the cut point to make a
tjunction
*/
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face_t *validfaces[MAX_MAP_PLANES];
face_t *inside, *outside;
int brushfaces;
int csgfaces;
int csgmergefaces;
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face_t *
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NewFaceFromFace (const face_t *in)
{
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face_t *newf;
newf = AllocFace ();
newf->planenum = in->planenum;
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newf->texturenum = in->texturenum;
newf->planeside = in->planeside;
newf->original = in->original;
newf->contents[0] = in->contents[0];
newf->contents[1] = in->contents[1];
newf->detail = in->detail;
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return newf;
}
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void
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SplitFace (face_t *in, plane_t *split, face_t **front, face_t **back)
{
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int i;
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int counts[3];
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plane_t plane;
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vec_t dot;
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winding_t *tmp;
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if (in->points->numpoints < 0)
Sys_Error ("SplitFace: freed face");
counts[0] = counts[1] = counts[2] = 0;
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// determine sides for each point
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for (i = 0; i < in->points->numpoints; i++) {
dot = DotProduct (in->points->points[i], split->normal) - split->dist;
if (dot > ON_EPSILON)
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counts[SIDE_FRONT]++;
else if (dot < -ON_EPSILON)
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counts[SIDE_BACK]++;
}
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if (!counts[SIDE_FRONT]) {
*front = NULL;
*back = in;
return;
}
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if (!counts[SIDE_BACK]) {
*front = in;
*back = NULL;
return;
}
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*back = NewFaceFromFace (in);
*front = NewFaceFromFace (in);
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tmp = CopyWinding (in->points);
(*front)->points = ClipWinding (tmp, split, 0);
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plane.dist = -split->dist;
VectorNegate (split->normal, plane.normal);
(*back)->points = ClipWinding (in->points, &plane, 0);
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in->points = 0; // freed by ClipWinding
FreeFace (in);
}
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/** Clips all of the faces in the ::inside list.
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Faces will be moved to the ::outside list or split into a piece in each
list. Faces exactly on the plane will stay inside unless overdrawn by
a later brush
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\param splitplane Index of the plane by which faces will be clipped.
\param frontside The side of the plane that holds the outside list.
\param precedence XXX
*/
static void
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ClipInside (int splitplane, int frontside, qboolean precedence)
{
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face_t *insidelist, *next, *f;
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face_t *frags[2];
plane_t *split;
split = &planes[splitplane];
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insidelist = NULL;
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for (f = inside; f; f = next) {
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next = f->next; // f->next will get mashed by SplitFace
if (f->planenum == splitplane) {
// exactly on, handle special
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// always clip off opposite facing
if (frontside != f->planeside || precedence) {
frags[frontside] = NULL;
frags[!frontside] = f;
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} else {
// leave it on the outside
frags[frontside] = f;
frags[!frontside] = NULL;
}
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} else {
// proper split
SplitFace (f, split, &frags[0], &frags[1]);
}
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if (frags[frontside]) {
frags[frontside]->next = outside;
outside = frags[frontside];
}
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if (frags[!frontside]) {
frags[!frontside]->next = insidelist;
insidelist = frags[!frontside];
}
}
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inside = insidelist;
}
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/** Saves all of the faces in the ::outside list to the bsp plane list
(::validfaces).
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\param mirror If true, add extra faces that face the opposite direction.
*/
static void
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SaveOutside (qboolean mirror)
{
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face_t *f, *next, *newf;
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int planenum;
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for (f = outside; f; f = next) {
next = f->next;
csgfaces++;
Draw_DrawFace (f);
planenum = f->planenum;
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if (mirror) {
newf = NewFaceFromFace (f);
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newf->points = CopyWindingReverse (f->points);
newf->planeside = f->planeside ^ 1; // reverse side
newf->contents[0] = f->contents[1];
newf->contents[1] = f->contents[0];
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validfaces[planenum] = MergeFaceToList (newf,
validfaces[planenum]);
}
validfaces[planenum] = MergeFaceToList (f, validfaces[planenum]);
validfaces[planenum] = FreeMergeListScraps (validfaces[planenum]);
}
}
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/** Free the faces that are inside the clipping brush.
If the clipping brush is non-solid, then the faces will be moved to
::outside rather than being freed, thus allowing the faces to continue
to exist.
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\param contents The contents of the clipping brush.
*/
static void
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FreeInside (int contents)
{
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face_t *next, *f;
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for (f = inside; f; f = next) {
next = f->next;
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if (contents != CONTENTS_SOLID) {
f->contents[0] = contents;
f->next = outside;
outside = f;
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} else
FreeFace (f);
}
}
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surface_t *
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BuildSurfaces (void)
{
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face_t *count;
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face_t **f;
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int i;
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surface_t *surfhead, *s;
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surfhead = NULL;
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f = validfaces;
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for (i = 0; i < numbrushplanes; i++, f++) {
if (!*f)
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continue; // nothing left on this plane
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// create a new surface to hold the faces on this plane
s = AllocSurface ();
s->planenum = i;
s->next = surfhead;
surfhead = s;
s->faces = *f;
for (count = s->faces; count; count = count->next) {
csgmergefaces++;
if (count->detail)
s->has_detail = 1;
else
s->has_struct = 1;
}
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CalcSurfaceInfo (s); // bounding box and flags
}
return surfhead;
}
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/** Create faces using the faces of the provided brush.
The ::outside list will be set to the list of created faces. The faces
will be such that their front is empty and their back is the contents of
the brush.
\param b The brush from which to create the faces.
*/
static void
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CopyFacesToOutside (brush_t *b)
{
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face_t *newf, *f;
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outside = NULL;
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for (f = b->faces; f; f = f->next) {
if (f->texturenum == TEX_SKIP)
continue;
brushfaces++;
newf = AllocFace ();
*newf = *f;
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newf->points = CopyWinding (f->points);
newf->next = outside;
newf->contents[0] = CONTENTS_EMPTY;
newf->contents[1] = b->contents;
outside = newf;
}
}
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surface_t *
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CSGFaces (brushset_t *bs)
{
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brush_t *b1, *b2;
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face_t *f;
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int i;
qboolean overwrite;
surface_t *surfhead;
qprintf ("---- CSGFaces ----\n");
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memset (validfaces, 0, sizeof (validfaces));
csgfaces = brushfaces = csgmergefaces = 0;
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Draw_ClearWindow ();
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// do the solid faces
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for (b1 = bs->brushes; b1; b1 = b1->next) {
// set outside to a copy of the brush's faces
CopyFacesToOutside (b1);
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if (b1->faces->texturenum < 0) {
// Don't split HINT and SKIP brushes.
SaveOutside (false);
continue;
}
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// earlier brushes do NOT overwrite
overwrite = false;
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for (b2 = bs->brushes; b2; b2 = b2->next) {
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// see if b2 needs to clip a chunk out of b1
if (b2->faces->texturenum < 0)
continue;
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if (b1 == b2) {
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// later brushes DO overwrite
overwrite = true;
continue;
}
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// check bounding box first
for (i = 0; i < 3; i++)
if (b1->mins[i] > b2->maxs[i] || b1->maxs[i] < b2->mins[i])
break;
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if (i < 3)
continue;
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// divide faces by the planes of the new brush
inside = outside;
outside = NULL;
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for (f = b2->faces; f; f = f->next)
ClipInside (f->planenum, f->planeside, overwrite);
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// these faces are contained in another brush, so get rid of them
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if (b1->contents == CONTENTS_SOLID
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&& b2->contents <= CONTENTS_WATER) {
// Faces from a solid brush are allowed to exist inside a
// non-solid brush. This forms an intrusion into the clipping
// brush.
FreeInside (b2->contents);
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} else {
// Unconditionally treat the clipping brush as solid to force
// contents merging, or to make an empty clipping brush clip
// away parts of other brushes.
FreeInside (CONTENTS_SOLID);
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}
}
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// all of the faces left in outside are real surface faces
// if the brush is not solid, mirror the faces for the inside view
SaveOutside (b1->contents != CONTENTS_SOLID);
}
#if 0
if (!csgfaces)
Sys_Error ("No faces");
#endif
surfhead = BuildSurfaces ();
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qprintf ("%5i brushfaces\n", brushfaces);
qprintf ("%5i csgfaces\n", csgfaces);
qprintf ("%5i mergedfaces\n", csgmergefaces);
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return surfhead;
}
//@}