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Reverse the winding for backside portals.

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This is part 1 of another optimization from tyrutils vis. It seems that
just reversing the winding gives a tiny speedup.
This commit is contained in:
Bill Currie 2013-03-15 19:22:57 +09:00
parent 46d41ad9ac
commit 5a2ee06787
1 changed files with 19 additions and 3 deletions
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22
tools/qfvis/source/qfvis.c
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@ -97,7 +97,7 @@ PlaneFromWinding (winding_t *winding, plane_t *plane)
{
vec3_t v1, v2;
// calc plane
// calc plane using CCW winding
VectorSubtract (winding->points[2], winding->points[1], v1);
VectorSubtract (winding->points[0], winding->points[1], v2);
CrossProduct (v2, v1, plane->normal);
@ -140,6 +140,19 @@ CopyWinding (winding_t *w)
return copy;
}
static winding_t *
NewFlippedWinding (const winding_t *w)
{
winding_t *flipped;
int i;
flipped = NewWinding (w->numpoints);
for (i = 0; i < w->numpoints; i++)
VectorCopy (w->points[i], flipped->points[w->numpoints - 1 - i]);
flipped->numpoints = w->numpoints;
return flipped;
}
/*
ClipWinding
@ -914,7 +927,7 @@ LoadPortals (char *name)
portal->winding = winding;
VectorNegate (plane.normal, portal->plane.normal);
portal->plane.dist = -plane.dist;
portal->plane.dist = -plane.dist; // plane is for CCW, portal is CW
portal->cluster = clusternums[1];
portal->sphere = sphere;
portal++;
@ -926,7 +939,10 @@ LoadPortals (char *name)
cluster->portals[cluster->numportals] = portal;
cluster->numportals++;
portal->winding = winding;
// Use a flipped winding for the reverse portal so the winding
// direction and plane normal match.
portal->winding = NewFlippedWinding (winding);
portal->winding->original = true;
portal->plane = plane;
portal->cluster = clusternums[0];
portal->sphere = sphere;