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q3cellshading/q3radiant/CSG.CPP
gmiranda db8ca37fa3 Initial commit 
git-svn-id: https://svn.code.sf.net/p/q3cellshading/code/trunk@2 db09e94b-7117-0410-a7e6-85ae5ff6e0e9
2006-07-05 14:05:49 +00:00

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/*
===========================================================================
Copyright (C) 1999-2005 Id Software, Inc.
This file is part of Quake III Arena source code.
Quake III Arena source code 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.
Quake III Arena source code 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.
You should have received a copy of the GNU General Public License
along with Foobar; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
===========================================================================
*/
#include "stdafx.h"
#include "qe3.h"
#include "winding.h"
/*
=============
CSG_MakeHollow
=============
*/
void Brush_Scale(brush_t* b)
{
for (face_t* f = b->brush_faces ; f ; f=f->next)
{
for (int i=0 ; i<3 ; i++)
{
VectorScale (f->planepts[i], g_qeglobals.d_gridsize, f->planepts[i]);
}
}
}
void CSG_MakeHollow (void)
{
brush_t *b, *front, *back, *next;
face_t *f;
face_t split;
vec3_t move;
int i;
for (b = selected_brushes.next ; b != &selected_brushes ; b=next)
{
next = b->next;
if (b->owner->eclass->fixedsize || b->patchBrush || b->terrainBrush || b->hiddenBrush)
continue;
for (f = b->brush_faces ; f ; f=f->next)
{
split = *f;
VectorScale (f->plane.normal, g_qeglobals.d_gridsize, move);
for (i=0 ; i<3 ; i++)
VectorSubtract (split.planepts[i], move, split.planepts[i]);
Brush_SplitBrushByFace (b, &split, &front, &back);
if (back)
Brush_Free (back);
if (front)
Brush_AddToList (front, &selected_brushes);
}
Brush_Free (b);
}
Sys_UpdateWindows (W_ALL);
}
/*
=============
Brush_Merge
Returns a new brush that is created by merging brush1 and brush2.
May return NULL if brush1 and brush2 do not create a convex brush when merged.
The input brushes brush1 and brush2 stay intact.
if onlyshape is true then the merge is allowed based on the shape only
otherwise the texture/shader references of faces in the same plane have to
be the same as well.
=============
*/
brush_t *Brush_Merge(brush_t *brush1, brush_t *brush2, int onlyshape)
{
int i, shared;
brush_t *newbrush;
face_t *face1, *face2, *newface, *f;
// check for bounding box overlapp
for (i = 0; i < 3; i++)
{
if (brush1->mins[i] > brush2->maxs[i] + ON_EPSILON
|| brush1->maxs[i] < brush2->mins[i] - ON_EPSILON)
{
// never merge if the brushes overlap
return NULL;
}
}
//
shared = 0;
// check if the new brush would be convex... flipped planes make a brush non-convex
for (face1 = brush1->brush_faces; face1; face1 = face1->next)
{
// don't check the faces of brush 1 and 2 touching each other
for (face2 = brush2->brush_faces; face2; face2 = face2->next)
{
if (Plane_Equal(&face1->plane, &face2->plane, true))
{
shared++;
// there may only be ONE shared side
if (shared > 1)
return NULL;
break;
}
}
// if this face plane is shared
if (face2) continue;
//
for (face2 = brush2->brush_faces; face2; face2 = face2->next)
{
// don't check the faces of brush 1 and 2 touching each other
for (f = brush1->brush_faces; f; f = f->next)
{
if (Plane_Equal(&face2->plane, &f->plane, true)) break;
}
if (f)
continue;
//
if (Plane_Equal(&face1->plane, &face2->plane, false))
{
//if the texture/shader references should be the same but are not
if (!onlyshape && stricmp(face1->texdef.name, face2->texdef.name) != 0) return NULL;
continue;
}
//
if (Winding_PlanesConcave(face1->face_winding, face2->face_winding,
face1->plane.normal, face2->plane.normal,
face1->plane.dist, face2->plane.dist))
{
return NULL;
} //end if
} //end for
} //end for
//
newbrush = Brush_Alloc();
//
for (face1 = brush1->brush_faces; face1; face1 = face1->next)
{
// don't add the faces of brush 1 and 2 touching each other
for (face2 = brush2->brush_faces; face2; face2 = face2->next)
{
if (Plane_Equal(&face1->plane, &face2->plane, true))
break;
}
if (face2)
continue;
// don't add faces with the same plane twice
for (f = newbrush->brush_faces; f; f = f->next)
{
if (Plane_Equal(&face1->plane, &f->plane, false))
break;
if (Plane_Equal(&face1->plane, &f->plane, true))
break;
}
if (f)
continue;
//
newface = Face_Alloc();
newface->texdef = face1->texdef;
VectorCopy(face1->planepts[0], newface->planepts[0]);
VectorCopy(face1->planepts[1], newface->planepts[1]);
VectorCopy(face1->planepts[2], newface->planepts[2]);
newface->plane = face1->plane;
newface->next = newbrush->brush_faces;
newbrush->brush_faces = newface;
}
//
for (face2 = brush2->brush_faces; face2; face2 = face2->next)
{
// don't add the faces of brush 1 and 2 touching each other
for (face1 = brush1->brush_faces; face1; face1 = face1->next)
{
if (Plane_Equal(&face2->plane, &face1->plane, true))
break;
}
if (face1)
continue;
// don't add faces with the same plane twice
for (f = newbrush->brush_faces; f; f = f->next)
{
if (Plane_Equal(&face2->plane, &f->plane, false))
break;
if (Plane_Equal(&face2->plane, &f->plane, true))
break;
}
if (f)
continue;
//
newface = Face_Alloc();
newface->texdef = face2->texdef;
VectorCopy(face2->planepts[0], newface->planepts[0]);
VectorCopy(face2->planepts[1], newface->planepts[1]);
VectorCopy(face2->planepts[2], newface->planepts[2]);
newface->plane = face2->plane;
newface->next = newbrush->brush_faces;
newbrush->brush_faces = newface;
}
// link the new brush to an entity
Entity_LinkBrush (brush1->owner, newbrush);
// build windings for the faces
Brush_BuildWindings( newbrush, false);
return newbrush;
}
/*
=============
Brush_MergeListPairs
Returns a list with merged brushes.
Tries to merge brushes pair wise.
The input list is destroyed.
Input and output should be a single linked list using .next
=============
*/
brush_t *Brush_MergeListPairs(brush_t *brushlist, int onlyshape)
{
int nummerges, merged;
brush_t *b1, *b2, *tail, *newbrush, *newbrushlist;
brush_t *lastb2;
if (!brushlist) return NULL;
nummerges = 0;
do
{
for (tail = brushlist; tail; tail = tail->next)
{
if (!tail->next) break;
}
merged = 0;
newbrushlist = NULL;
for (b1 = brushlist; b1; b1 = brushlist)
{
lastb2 = b1;
for (b2 = b1->next; b2; b2 = b2->next)
{
newbrush = Brush_Merge(b1, b2, onlyshape);
if (newbrush)
{
tail->next = newbrush;
lastb2->next = b2->next;
brushlist = brushlist->next;
b1->next = b1->prev = NULL;
b2->next = b2->prev = NULL;
Brush_Free(b1);
Brush_Free(b2);
for (tail = brushlist; tail; tail = tail->next)
{
if (!tail->next) break;
} //end for
merged++;
nummerges++;
break;
}
lastb2 = b2;
}
//if b1 can't be merged with any of the other brushes
if (!b2)
{
brushlist = brushlist->next;
//keep b1
b1->next = newbrushlist;
newbrushlist = b1;
}
}
brushlist = newbrushlist;
} while(merged);
return newbrushlist;
}
/*
=============
Brush_MergeList
Tries to merge all brushes in the list into one new brush.
The input brush list stays intact.
Returns NULL if no merged brush can be created.
To create a new brush the brushes in the list may not overlap and
the outer faces of the brushes together should make a new convex brush.
if onlyshape is true then the merge is allowed based on the shape only
otherwise the texture/shader references of faces in the same plane have to
be the same as well.
=============
*/
brush_t *Brush_MergeList(brush_t *brushlist, int onlyshape)
{
brush_t *brush1, *brush2, *brush3, *newbrush;
face_t *face1, *face2, *face3, *newface, *f;
if (!brushlist) return NULL;
for (brush1 = brushlist; brush1; brush1 = brush1->next)
{
// check if the new brush would be convex... flipped planes make a brush concave
for (face1 = brush1->brush_faces; face1; face1 = face1->next)
{
// don't check face1 if it touches another brush
for (brush2 = brushlist; brush2; brush2 = brush2->next)
{
if (brush2 == brush1) continue;
for (face2 = brush2->brush_faces; face2; face2 = face2->next)
{
if (Plane_Equal(&face1->plane, &face2->plane, true))
{
break;
}
}
if (face2) break;
}
// if face1 touches another brush
if (brush2) continue;
//
for (brush2 = brush1->next; brush2; brush2 = brush2->next)
{
// don't check the faces of brush 2 touching another brush
for (face2 = brush2->brush_faces; face2; face2 = face2->next)
{
for (brush3 = brushlist; brush3; brush3 = brush3->next)
{
if (brush3 == brush2) continue;
for (face3 = brush3->brush_faces; face3; face3 = face3->next)
{
if (Plane_Equal(&face2->plane, &face3->plane, true)) break;
}
if (face3) break;
}
// if face2 touches another brush
if (brush3) continue;
//
if (Plane_Equal(&face1->plane, &face2->plane, false))
{
//if the texture/shader references should be the same but are not
if (!onlyshape && stricmp(face1->texdef.name, face2->texdef.name) != 0) return NULL;
continue;
}
//
if (Winding_PlanesConcave(face1->face_winding, face2->face_winding,
face1->plane.normal, face2->plane.normal,
face1->plane.dist, face2->plane.dist))
{
return NULL;
}
}
}
}
}
//
newbrush = Brush_Alloc();
//
for (brush1 = brushlist; brush1; brush1 = brush1->next)
{
for (face1 = brush1->brush_faces; face1; face1 = face1->next)
{
// don't add face1 to the new brush if it touches another brush
for (brush2 = brushlist; brush2; brush2 = brush2->next)
{
if (brush2 == brush1) continue;
for (face2 = brush2->brush_faces; face2; face2 = face2->next)
{
if (Plane_Equal(&face1->plane, &face2->plane, true))
{
break;
}
}
if (face2) break;
}
if (brush2) continue;
// don't add faces with the same plane twice
for (f = newbrush->brush_faces; f; f = f->next)
{
if (Plane_Equal(&face1->plane, &f->plane, false))
break;
if (Plane_Equal(&face1->plane, &f->plane, true))
break;
}
if (f)
continue;
//
newface = Face_Alloc();
newface->texdef = face1->texdef;
VectorCopy(face1->planepts[0], newface->planepts[0]);
VectorCopy(face1->planepts[1], newface->planepts[1]);
VectorCopy(face1->planepts[2], newface->planepts[2]);
newface->plane = face1->plane;
newface->next = newbrush->brush_faces;
newbrush->brush_faces = newface;
}
}
// link the new brush to an entity
Entity_LinkBrush (brushlist->owner, newbrush);
// build windings for the faces
Brush_BuildWindings( newbrush, false);
return newbrush;
}
/*
=============
Brush_Subtract
Returns a list of brushes that remain after B is subtracted from A.
May by empty if A is contained inside B.
The originals are undisturbed.
=============
*/
brush_t *Brush_Subtract(brush_t *a, brush_t *b)
{
// a - b = out (list)
brush_t *front, *back;
brush_t *in, *out, *next;
face_t *f;
in = a;
out = NULL;
for (f = b->brush_faces; f && in; f = f->next)
{
Brush_SplitBrushByFace(in, f, &front, &back);
if (in != a) Brush_Free(in);
if (front)
{ // add to list
front->next = out;
out = front;
}
in = back;
}
//NOTE: in != a just in case brush b has no faces
if (in && in != a)
{
Brush_Free(in);
}
else
{ //didn't really intersect
for (b = out; b; b = next)
{
next = b->next;
b->next = b->prev = NULL;
Brush_Free(b);
}
return a;
}
return out;
}
/*
=============
CSG_Subtract
=============
*/
void CSG_Subtract (void)
{
brush_t *b, *s, *fragments, *nextfragment, *frag, *next, *snext;
brush_t fragmentlist;
int i, numfragments, numbrushes;
Sys_Printf ("Subtracting...\n");
if (selected_brushes.next == &selected_brushes)
{
Sys_Printf("No brushes selected.\n");
return;
}
fragmentlist.next = &fragmentlist;
fragmentlist.prev = &fragmentlist;
numfragments = 0;
numbrushes = 0;
for (b = selected_brushes.next ; b != &selected_brushes ; b=next)
{
next = b->next;
if (b->owner->eclass->fixedsize)
continue; // can't use texture from a fixed entity, so don't subtract
// chop all fragments further up
for (s = fragmentlist.next; s != &fragmentlist; s = snext)
{
snext = s->next;
for (i=0 ; i<3 ; i++)
if (b->mins[i] >= s->maxs[i] - ON_EPSILON
|| b->maxs[i] <= s->mins[i] + ON_EPSILON)
break;
if (i != 3)
continue; // definately don't touch
fragments = Brush_Subtract(s, b);
// if the brushes did not really intersect
if (fragments == s)
continue;
// try to merge fragments
fragments = Brush_MergeListPairs(fragments, true);
// add the fragments to the list
for (frag = fragments; frag; frag = nextfragment)
{
nextfragment = frag->next;
frag->next = NULL;
frag->owner = s->owner;
Brush_AddToList(frag, &fragmentlist);
}
// free the original brush
Brush_Free(s);
}
// chop any active brushes up
for (s = active_brushes.next; s != &active_brushes; s = snext)
{
snext = s->next;
if (s->owner->eclass->fixedsize || s->patchBrush || s->terrainBrush || s->hiddenBrush)
continue;
//face_t *pFace = s->brush_faces;
if (s->brush_faces->d_texture->bFromShader && (s->brush_faces->d_texture->nShaderFlags & QER_NOCARVE))
{
continue;
}
for (i=0 ; i<3 ; i++)
if (b->mins[i] >= s->maxs[i] - ON_EPSILON
|| b->maxs[i] <= s->mins[i] + ON_EPSILON)
break;
if (i != 3)
continue; // definately don't touch
fragments = Brush_Subtract(s, b);
// if the brushes did not really intersect
if (fragments == s)
continue;
//
Undo_AddBrush(s);
// one extra brush chopped up
numbrushes++;
// try to merge fragments
fragments = Brush_MergeListPairs(fragments, true);
// add the fragments to the list
for (frag = fragments; frag; frag = nextfragment)
{
nextfragment = frag->next;
frag->next = NULL;
frag->owner = s->owner;
Brush_AddToList(frag, &fragmentlist);
}
// free the original brush
Brush_Free(s);
}
}
// move all fragments to the active brush list
for (frag = fragmentlist.next; frag != &fragmentlist; frag = nextfragment)
{
nextfragment = frag->next;
numfragments++;
Brush_RemoveFromList(frag);
Brush_AddToList(frag, &active_brushes);
Undo_EndBrush(frag);
}
if (numfragments == 0)
{
Sys_Printf("Selected brush%s did not intersect with any other brushes.\n",
(selected_brushes.next->next == &selected_brushes) ? "":"es");
return;
}
Sys_Printf("done. (created %d fragment%s out of %d brush%s)\n", numfragments, (numfragments == 1)?"":"s",
numbrushes, (numbrushes == 1)?"":"es");
Sys_UpdateWindows(W_ALL);
}
/*
=============
CSG_Merge
=============
*/
void CSG_Merge(void)
{
brush_t *b, *next, *newlist, *newbrush;
struct entity_s *owner;
Sys_Printf ("Merging...\n");
if (selected_brushes.next == &selected_brushes)
{
Sys_Printf("No brushes selected.\n");
return;
}
if (selected_brushes.next->next == &selected_brushes)
{
Sys_Printf("At least two brushes have to be selected.\n");
return;
}
owner = selected_brushes.next->owner;
for (b = selected_brushes.next; b != &selected_brushes; b = next)
{
next = b->next;
if (b->owner->eclass->fixedsize)
{
// can't use texture from a fixed entity, so don't subtract
Sys_Printf("Cannot add fixed size entities.\n");
return;
}
if (b->patchBrush)
{
Sys_Printf("Cannot add patches.\n");
return;
}
if (b->terrainBrush)
{
Sys_Printf("Cannot add terrains.\n");
return;
}
if (b->brush_faces->d_texture->bFromShader && (b->brush_faces->d_texture->nShaderFlags & QER_NOCARVE))
{
Sys_Printf("Cannot add brushes using shaders that don't allows CSG operations.\n");
return;
}
if (b->owner != owner)
{
Sys_Printf("Cannot add brushes from different entities.\n");
return;
}
}
newlist = NULL;
for (b = selected_brushes.next; b != &selected_brushes; b = next)
{
next = b->next;
Brush_RemoveFromList(b);
b->next = newlist;
b->prev = NULL;
newlist = b;
}
newbrush = Brush_MergeList(newlist, true);
// if the new brush would not be convex
if (!newbrush)
{
// add the brushes back into the selection
for (b = newlist; b; b = next)
{
next = b->next;
b->next = NULL;
b->prev = NULL;
Brush_AddToList(b, &selected_brushes);
}
Sys_Printf("Cannot add a set of brushes with a concave hull.\n");
return;
}
// free the original brushes
for (b = newlist; b; b = next)
{
next = b->next;
b->next = NULL;
b->prev = NULL;
Brush_Free(b);
}
Brush_AddToList(newbrush, &selected_brushes);
Sys_Printf ("done.\n");
Sys_UpdateWindows (W_ALL);
}
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