ref: bea7b7bf8ccbc2bc41906517079e76fcfb31cb5a
dir: /code/bspc/aas_facemerging.c/
/*
===========================================================================
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 "qbsp.h"
#include "../botlib/aasfile.h"
#include "aas_create.h"
//===========================================================================
//
// Parameter: -
// Returns: -
// Changes Globals: -
//===========================================================================
int AAS_TryMergeFaces(tmp_face_t *face1, tmp_face_t *face2)
{
winding_t *neww;
#ifdef DEBUG
if (!face1->winding) Error("face1 %d without winding", face1->num);
if (!face2->winding) Error("face2 %d without winding", face2->num);
#endif //DEBUG
//
if (face1->faceflags != face2->faceflags) return false;
//NOTE: if the front or back area is zero this doesn't mean there's
//a real area. It means there's solid at that side of the face
//if both faces have the same front area
if (face1->frontarea == face2->frontarea)
{
//if both faces have the same back area
if (face1->backarea == face2->backarea)
{
//if the faces are in the same plane
if (face1->planenum == face2->planenum)
{
//if they have both a front and a back area (no solid on either side)
if (face1->frontarea && face1->backarea)
{
neww = MergeWindings(face1->winding, face2->winding,
mapplanes[face1->planenum].normal);
} //end if
else
{
//this function is to be found in l_poly.c
neww = TryMergeWinding(face1->winding, face2->winding,
mapplanes[face1->planenum].normal);
} //end else
if (neww)
{
FreeWinding(face1->winding);
face1->winding = neww;
if (face2->frontarea) AAS_RemoveFaceFromArea(face2, face2->frontarea);
if (face2->backarea) AAS_RemoveFaceFromArea(face2, face2->backarea);
AAS_FreeTmpFace(face2);
return true;
} //end if
} //end if
else if ((face1->planenum & ~1) == (face2->planenum & ~1))
{
Log_Write("face %d and %d, same front and back area but flipped planes\r\n",
face1->num, face2->num);
} //end if
} //end if
} //end if
return false;
} //end of the function AAS_TryMergeFaces
/*
int AAS_TryMergeFaces(tmp_face_t *face1, tmp_face_t *face2)
{
winding_t *neww;
#ifdef DEBUG
if (!face1->winding) Error("face1 %d without winding", face1->num);
if (!face2->winding) Error("face2 %d without winding", face2->num);
#endif //DEBUG
//if the faces are in the same plane
if ((face1->planenum & ~1) != (face2->planenum & ~1)) return false;
// if (face1->planenum != face2->planenum) return false;
//NOTE: if the front or back area is zero this doesn't mean there's
//a real area. It means there's solid at that side of the face
//if both faces have the same front area
if (face1->frontarea != face2->frontarea ||
face1->backarea != face2->backarea)
{
if (!face1->frontarea || !face1->backarea ||
!face2->frontarea || !face2->backarea) return false;
else if (face1->frontarea != face2->backarea ||
face1->backarea != face2->frontarea) return false;
// return false;
} //end if
//this function is to be found in l_poly.c
neww = TryMergeWinding(face1->winding, face2->winding,
mapplanes[face1->planenum].normal);
if (!neww) return false;
//
FreeWinding(face1->winding);
face1->winding = neww;
//remove face2
if (face2->frontarea)
AAS_RemoveFaceFromArea(face2, &tmpaasworld.areas[face2->frontarea]);
if (face2->backarea)
AAS_RemoveFaceFromArea(face2, &tmpaasworld.areas[face2->backarea]);
return true;
} //end of the function AAS_TryMergeFaces*/
//===========================================================================
//
// Parameter: -
// Returns: -
// Changes Globals: -
//===========================================================================
void AAS_MergeAreaFaces(void)
{
int num_facemerges = 0;
int side1, side2, restart;
tmp_area_t *tmparea, *lasttmparea;
tmp_face_t *face1, *face2;
Log_Write("AAS_MergeAreaFaces\r\n");
qprintf("%6d face merges", num_facemerges);
//NOTE: first convex area is a dummy
lasttmparea = tmpaasworld.areas;
for (tmparea = tmpaasworld.areas; tmparea; tmparea = tmparea->l_next)
{
restart = false;
//
if (tmparea->invalid) continue;
//
for (face1 = tmparea->tmpfaces; face1; face1 = face1->next[side1])
{
side1 = face1->frontarea != tmparea;
for (face2 = face1->next[side1]; face2; face2 = face2->next[side2])
{
side2 = face2->frontarea != tmparea;
//if succesfully merged
if (AAS_TryMergeFaces(face1, face2))
{
//start over again after merging two faces
restart = true;
num_facemerges++;
qprintf("\r%6d", num_facemerges);
AAS_CheckArea(tmparea);
break;
} //end if
} //end for
if (restart)
{
tmparea = lasttmparea;
break;
} //end if
} //end for
lasttmparea = tmparea;
} //end for
qprintf("\n");
Log_Write("%6d face merges\r\n", num_facemerges);
} //end of the function AAS_MergeAreaFaces
//===========================================================================
//
// Parameter: -
// Returns: -
// Changes Globals: -
//===========================================================================
void AAS_MergePlaneFaces(tmp_area_t *tmparea, int planenum)
{
tmp_face_t *face1, *face2, *nextface2;
winding_t *neww;
int side1, side2;
for (face1 = tmparea->tmpfaces; face1; face1 = face1->next[side1])
{
side1 = face1->frontarea != tmparea;
if (face1->planenum != planenum) continue;
//
for (face2 = face1->next[side1]; face2; face2 = nextface2)
{
side2 = face2->frontarea != tmparea;
nextface2 = face2->next[side2];
//
if ((face2->planenum & ~1) != (planenum & ~1)) continue;
//
neww = MergeWindings(face1->winding, face2->winding,
mapplanes[face1->planenum].normal);
FreeWinding(face1->winding);
face1->winding = neww;
if (face2->frontarea) AAS_RemoveFaceFromArea(face2, face2->frontarea);
if (face2->backarea) AAS_RemoveFaceFromArea(face2, face2->backarea);
AAS_FreeTmpFace(face2);
//
nextface2 = face1->next[side1];
} //end for
} //end for
} //end of the function AAS_MergePlaneFaces
//===========================================================================
//
// Parameter: -
// Returns: -
// Changes Globals: -
//===========================================================================
int AAS_CanMergePlaneFaces(tmp_area_t *tmparea, int planenum)
{
tmp_area_t *frontarea, *backarea;
tmp_face_t *face1;
int side1, merge, faceflags;
frontarea = backarea = NULL;
merge = false;
for (face1 = tmparea->tmpfaces; face1; face1 = face1->next[side1])
{
side1 = face1->frontarea != tmparea;
if ((face1->planenum & ~1) != (planenum & ~1)) continue;
if (!frontarea && !backarea)
{
frontarea = face1->frontarea;
backarea = face1->backarea;
faceflags = face1->faceflags;
} //end if
else
{
if (frontarea != face1->frontarea) return false;
if (backarea != face1->backarea) return false;
if (faceflags != face1->faceflags) return false;
merge = true;
} //end else
} //end for
return merge;
} //end of the function AAS_CanMergePlaneFaces
//===========================================================================
//
// Parameter: -
// Returns: -
// Changes Globals: -
//===========================================================================
void AAS_MergeAreaPlaneFaces(void)
{
int num_facemerges = 0;
int side1;
tmp_area_t *tmparea, *nexttmparea;
tmp_face_t *face1;
Log_Write("AAS_MergePlaneFaces\r\n");
qprintf("%6d plane face merges", num_facemerges);
//NOTE: first convex area is a dummy
for (tmparea = tmpaasworld.areas; tmparea; tmparea = nexttmparea)
{
nexttmparea = tmparea->l_next;
//
if (tmparea->invalid) continue;
//
for (face1 = tmparea->tmpfaces; face1; face1 = face1->next[side1])
{
side1 = face1->frontarea != tmparea;
//
if (AAS_CanMergePlaneFaces(tmparea, face1->planenum))
{
AAS_MergePlaneFaces(tmparea, face1->planenum);
nexttmparea = tmparea;
num_facemerges++;
qprintf("\r%6d", num_facemerges);
break;
} //end if
} //end for
} //end for
qprintf("\n");
Log_Write("%6d plane face merges\r\n", num_facemerges);
} //end of the function AAS_MergeAreaPlaneFaces