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engine.cpp: lintersect(): use klabs() instead of abs() 

git-svn-id: https://svn.eduke32.com/eduke32@7474 1a8010ca-5511-0410-912e-c29ae57300e0
This commit is contained in:
pogokeen 2019-04-05 20:41:04 +00:00 committed by Christoph Oelckers
parent 0bfde1c4d3
commit 9b0573f0f2
1 changed files with 4 additions and 4 deletions
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8
source/build/src/engine.cpp
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@ -7490,13 +7490,13 @@ int32_t lintersect(const int32_t originX, const int32_t originY, const int32_t o
// If the point is outside of the bounds of the line segment, we know we don't have an intersection.
// t is < 0 if (originDiffCrossLineVec^rayCrossLineVec) & signBit)
// u is < 0 if (originDiffCrossRay^rayCrossLineVec) & signBit
// t is > 1 if abs(originDiffCrossLineVec) > abs(rayCrossLineVec)
// u is > 1 if abs(originDiffCrossRay) > abs(rayCrossLineVec)
// t is > 1 if klabs(originDiffCrossLineVec) > klabs(rayCrossLineVec)
// u is > 1 if klabs(originDiffCrossRay) > klabs(rayCrossLineVec)
// where int32_t u = tabledivide64(((int64_t) originDiffCrossRay) << 24L, rayCrossLineVec);
if (((originDiffCrossLineVec^rayCrossLineVec) & signBit) ||
((originDiffCrossRay^rayCrossLineVec) & signBit) ||
abs(originDiffCrossLineVec) > abs(rayCrossLineVec) ||
abs(originDiffCrossRay) > abs(rayCrossLineVec))
klabs(originDiffCrossLineVec) > klabs(rayCrossLineVec) ||
klabs(originDiffCrossRay) > klabs(rayCrossLineVec))
{
// line segments do not overlap
return 0;