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Fix #656 by making SSurface::SplitInHalf thread safe. 

SSurface::SplitInHalf was modifying the surface and then restoring it at the end. Make temporary copy instead.
pull/667/head
phkahler 2020-07-31 22:10:29 -04:00
parent d8b76ef7f1
commit fd2dfe87f6
1 changed files with 17 additions and 19 deletions
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36
src/srf/raycast.cpp
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@ -130,39 +130,38 @@ void SSurface::SplitInHalf(bool byU, SSurface *sa, SSurface *sb) {
sa->degn = sb->degn = degn;
// by de Casteljau's algorithm in a projective space; so we must work
// on points (w*x, w*y, w*z, w)
WeightControlPoints();
// on points (w*x, w*y, w*z, w) so create a temporary copy
SSurface st;
st = *this;
st.WeightControlPoints();
switch(byU ? degm : degn) {
case 1:
sa->CopyRowOrCol (byU, 0, this, 0);
sb->CopyRowOrCol (byU, 1, this, 1);
sa->CopyRowOrCol (byU, 0, &st, 0);
sb->CopyRowOrCol (byU, 1, &st, 1);
sa->BlendRowOrCol(byU, 1, this, 0, this, 1);
sb->BlendRowOrCol(byU, 0, this, 0, this, 1);
sa->BlendRowOrCol(byU, 1, &st, 0, &st, 1);
sb->BlendRowOrCol(byU, 0, &st, 0, &st, 1);
break;
case 2:
sa->CopyRowOrCol (byU, 0, this, 0);
sb->CopyRowOrCol (byU, 2, this, 2);
sa->CopyRowOrCol (byU, 0, &st, 0);
sb->CopyRowOrCol (byU, 2, &st, 2);
sa->BlendRowOrCol(byU, 1, this, 0, this, 1);
sb->BlendRowOrCol(byU, 1, this, 1, this, 2);
sa->BlendRowOrCol(byU, 1, &st, 0, &st, 1);
sb->BlendRowOrCol(byU, 1, &st, 1, &st, 2);
sa->BlendRowOrCol(byU, 2, sa, 1, sb, 1);
sb->BlendRowOrCol(byU, 0, sa, 1, sb, 1);
break;
case 3: {
SSurface st;
st.degm = degm; st.degn = degn;
sa->CopyRowOrCol (byU, 0, &st, 0);
sb->CopyRowOrCol (byU, 3, &st, 3);
sa->CopyRowOrCol (byU, 0, this, 0);
sb->CopyRowOrCol (byU, 3, this, 3);
sa->BlendRowOrCol(byU, 1, this, 0, this, 1);
sb->BlendRowOrCol(byU, 2, this, 2, this, 3);
st. BlendRowOrCol(byU, 0, this, 1, this, 2); // scratch var
sa->BlendRowOrCol(byU, 1, &st, 0, &st, 1);
sb->BlendRowOrCol(byU, 2, &st, 2, &st, 3);
st. BlendRowOrCol(byU, 0, &st, 1, &st, 2); // use row/col 0 as scratch
sa->BlendRowOrCol(byU, 2, sa, 1, &st, 0);
sb->BlendRowOrCol(byU, 1, sb, 2, &st, 0);
@ -177,7 +176,6 @@ void SSurface::SplitInHalf(bool byU, SSurface *sa, SSurface *sb) {
sa->UnWeightControlPoints();
sb->UnWeightControlPoints();
UnWeightControlPoints();
}
//-----------------------------------------------------------------------------