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- handle one particular edge case when checking if a line is completely behind a mirror.

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This is not really sufficient to detect all cases where something gets incorrectly flagged as ok, but it's the easiest one to detect.
This commit is contained in:
Christoph Oelckers 2016-02-05 13:47:07 +01:00
parent dda73b531c
commit c4b1b96484
1 changed files with 5 additions and 2 deletions
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7
src/gl/scene/gl_portal.cpp
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@ -937,9 +937,12 @@ void GLMirrorPortal::DrawContents()
int GLMirrorPortal::ClipSeg(seg_t *seg)
{
we cannot use P_PointOnLineSide here because it loses the special meaning of 0 == 'on the line'.
int side1 = DMulScale32(seg->v1->y - linedef->v1->y, linedef->dx, linedef->v1->x - seg->v1->x, linedef->dy);
int side2 = DMulScale32(seg->v2->y - linedef->v1->y, linedef->dx, linedef->v1->x - seg->v2->x, linedef->dy);
if (side1 >= 0 && side2 >= 0)
// this seg is completely behind the mirror.
if (P_PointOnLineSide(seg->v1->x, seg->v1->y, linedef) &&
P_PointOnLineSide(seg->v2->x, seg->v2->y, linedef))
{
return PClip_InFront;
}