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audit all uses of ClipWindingEpsilon and choose the strict variant or not, and explain why

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This commit is contained in:
Rudolf Polzer 2011-11-23 09:44:05 +01:00
parent 323c01a983
commit 6b01d68ba6
6 changed files with 17 additions and 11 deletions
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4
tools/quake3/q3map2/brush.c
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@ -1027,8 +1027,8 @@ void SplitBrush( brush_t *brush, int planenum, brush_t **front, brush_t **back )
w = s->winding;
if (!w)
continue;
ClipWindingEpsilon (w, plane->normal, plane->dist,
0 /*PLANESIDE_EPSILON*/, &cw[0], &cw[1]);
ClipWindingEpsilonStrict (w, plane->normal, plane->dist,
0 /*PLANESIDE_EPSILON*/, &cw[0], &cw[1]); /* strict, in parallel case we get the face back because it also is the midwinding */
for (j=0 ; j<2 ; j++)
{
if (!cw[j])

2
tools/quake3/q3map2/decals.c
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@ -594,7 +594,7 @@ static void ProjectDecalOntoWinding( decalProjector_t *dp, mapDrawSurface_t *ds,
for( i = 0; i < dp->numPlanes; i++ )
{
/* chop winding by the plane */
ClipWindingEpsilon( w, dp->planes[ i ], dp->planes[ i ][ 3 ], 0.0625f, &front, &back );
ClipWindingEpsilonStrict( w, dp->planes[ i ], dp->planes[ i ][ 3 ], 0.0625f, &front, &back ); /* strict, if identical plane we don't want to keep it */
FreeWinding( w );
/* lose the front fragment */

4
tools/quake3/q3map2/facebsp.c
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@ -295,8 +295,8 @@ void BuildFaceTree_r( node_t *node, face_t *list )
/* switch on side */
if( side == SIDE_CROSS )
{
ClipWindingEpsilon( split->w, plane->normal, plane->dist, CLIP_EPSILON * 2,
&frontWinding, &backWinding );
ClipWindingEpsilonStrict( split->w, plane->normal, plane->dist, CLIP_EPSILON * 2,
&frontWinding, &backWinding ); /* strict; if no winding is left, we have a "virtually identical" plane and don't want to split by it */
if( frontWinding ) {
newFace = AllocBspFace();
newFace->w = frontWinding;

2
tools/quake3/q3map2/fog.c
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@ -408,7 +408,7 @@ qboolean ChopFaceSurfaceByBrush( entity_t *e, mapDrawSurface_t *ds, brush_t *b )
continue;
/* general case */
ClipWindingEpsilon( w, plane->normal, plane->dist, ON_EPSILON, &front, &back );
ClipWindingEpsilonStrict( w, plane->normal, plane->dist, ON_EPSILON, &front, &back ); /* strict; if plane is "almost identical" to face, both ways to continue can be wrong, so we better not fog it */
FreeWinding( w );
if( back == NULL )

2
tools/quake3/q3map2/portals.c
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@ -410,7 +410,7 @@ void SplitNodePortals (node_t *node)
// cut the portal into two portals, one on each side of the cut plane
//
ClipWindingEpsilon (p->winding, plane->normal, plane->dist,
SPLIT_WINDING_EPSILON, &frontwinding, &backwinding);
SPLIT_WINDING_EPSILON, &frontwinding, &backwinding); /* not strict, we want to always keep one of them even if coplanar */
if (frontwinding && WindingIsTiny(frontwinding))
{

14
tools/quake3/q3map2/surface.c
View File

@ -1356,7 +1356,7 @@ static void SubdivideFace_r( entity_t *e, brush_t *brush, side_t *side, winding_
if( (subCeil - subFloor) > subdivisions )
{
/* clip the winding */
ClipWindingEpsilon( w, planeNormal, d, epsilon, &frontWinding, &backWinding );
ClipWindingEpsilon( w, planeNormal, d, epsilon, &frontWinding, &backWinding ); /* not strict; we assume we always keep a winding */
/* the clip may not produce two polygons if it was epsilon close */
if( frontWinding == NULL )
@ -1498,8 +1498,14 @@ void ClipSideIntoTree_r( winding_t *w, side_t *side, node_t *node )
}
plane = &mapplanes[ node->planenum ];
ClipWindingEpsilon ( w, plane->normal, plane->dist,
ON_EPSILON, &front, &back );
ClipWindingEpsilonStrict ( w, plane->normal, plane->dist,
ON_EPSILON, &front, &back ); /* strict, we handle the "winding disappeared" case */
if(!front && !back)
{
/* in doubt, register it in both nodes */
front = CopyWinding(w);
back = CopyWinding(w);
}
FreeWinding( w );
ClipSideIntoTree_r( front, side, node->children[0] );
@ -2108,7 +2114,7 @@ int FilterWindingIntoTree_r( winding_t *w, mapDrawSurface_t *ds, node_t *node )
}
/* clip the winding by this plane */
ClipWindingEpsilonStrict( w, plane1, plane1[ 3 ], ON_EPSILON, &front, &back );
ClipWindingEpsilonStrict( w, plane1, plane1[ 3 ], ON_EPSILON, &front, &back ); /* strict; we handle the "winding disappeared" case */
/* filter by this plane */
refs = 0;