diff options
Diffstat (limited to 'q3radiant/CSG.CPP')
| -rwxr-xr-x | q3radiant/CSG.CPP | 686 |
1 files changed, 686 insertions, 0 deletions
diff --git a/q3radiant/CSG.CPP b/q3radiant/CSG.CPP new file mode 100755 index 0000000..eef0b14 --- /dev/null +++ b/q3radiant/CSG.CPP @@ -0,0 +1,686 @@ +/* +=========================================================================== +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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