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Merge pull request #1002 from barfowl/vtr_level_tag_bits

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Simplify Vtr bitfield operations to avoid issues with older versions of GCC
This commit is contained in:
David G Yu 2018-10-01 13:05:17 -07:00 committed by GitHub
commit 2fe36033d5
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2 changed files with 23 additions and 30 deletions
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45
opensubdiv/vtr/level.cpp
View File

@ -604,47 +604,33 @@ Level::getFaceETags(Index fIndex, ETag eTags[], int fvarChannel) const {
}
}
namespace {
template <typename TAG_TYPE, typename INT_TYPE>
void
combineTags(TAG_TYPE& dstTag, TAG_TYPE const& srcTag) {
assert(sizeof(TAG_TYPE) == sizeof(INT_TYPE));
INT_TYPE const & srcInt = *(reinterpret_cast<INT_TYPE const*>(&srcTag));
INT_TYPE & dstInt = *(reinterpret_cast<INT_TYPE *> (&dstTag));
dstInt |= srcInt;
}
}
Level::VTag
Level::VTag::BitwiseOr(VTag const vTags[], int size) {
VTag compTag = vTags[0];
VTag::VTagSize tagBits = vTags[0].getBits();
for (int i = 1; i < size; ++i) {
combineTags<VTag, VTag::VTagSize>(compTag, vTags[i]);
tagBits |= vTags[i].getBits();
}
return compTag;
return VTag(tagBits);
}
Level::ETag
Level::ETag::BitwiseOr(ETag const eTags[], int size) {
ETag compTag = eTags[0];
ETag::ETagSize tagBits = eTags[0].getBits();
for (int i = 1; i < size; ++i) {
combineTags<ETag, ETag::ETagSize>(compTag, eTags[i]);
tagBits |= eTags[i].getBits();
}
return compTag;
return ETag(tagBits);
}
Level::VTag
Level::getFaceCompositeVTag(ConstIndexArray & fVerts) const {
VTag compTag = _vertTags[fVerts[0]];
VTag::VTagSize tagBits = _vertTags[fVerts[0]].getBits();
for (int i = 1; i < fVerts.size(); ++i) {
combineTags<VTag, VTag::VTagSize>(compTag, _vertTags[fVerts[i]]);
tagBits |= _vertTags[fVerts[i]].getBits();
}
return compTag;
return VTag(tagBits);
}
Level::VTag
Level::getFaceCompositeVTag(Index fIndex, int fvarChannel) const {
@ -657,12 +643,11 @@ Level::getFaceCompositeVTag(Index fIndex, int fvarChannel) const {
internal::StackBuffer<FVarLevel::ValueTag,64> fvarTags(fVerts.size());
fvarLevel.getFaceValueTags(fIndex, fvarTags);
VTag compTag = fvarTags[0].combineWithLevelVTag(_vertTags[fVerts[0]]);
VTag::VTagSize tagBits = fvarTags[0].combineWithLevelVTag(_vertTags[fVerts[0]]).getBits();
for (int i = 1; i < fVerts.size(); ++i) {
combineTags<VTag, VTag::VTagSize>(compTag,
fvarTags[i].combineWithLevelVTag(_vertTags[fVerts[i]]));
tagBits |= fvarTags[i].combineWithLevelVTag(_vertTags[fVerts[i]]).getBits();
}
return compTag;
return VTag(tagBits);
}
}
@ -675,11 +660,11 @@ Level::getVertexCompositeFVarVTag(Index vIndex, int fvarChannel) const {
VTag vTag = getVertexTag(vIndex);
if (fvTags[0].isMismatch()) {
VTag compVTag = fvTags[0].combineWithLevelVTag(vTag);
VTag::VTagSize tagBits = fvTags[0].combineWithLevelVTag(vTag).getBits();
for (int i = 1; i < fvTags.size(); ++i) {
combineTags<VTag, VTag::VTagSize>(compVTag, fvTags[i].combineWithLevelVTag(vTag));
tagBits |= fvTags[i].combineWithLevelVTag(vTag).getBits();
}
return compVTag;
return VTag(tagBits);
} else {
return vTag;
}

8
opensubdiv/vtr/level.h
View File

@ -119,6 +119,10 @@ public:
VTagSize _infSharpCrease : 1; // fixed
VTagSize _infIrregular : 1; // fixed
// Alternate constructor and accessor for dealing with integer bits directly:
explicit VTag(VTagSize bits) { *this = *reinterpret_cast<VTag const *>(&bits); }
VTagSize getBits() const { return *reinterpret_cast<VTagSize const *>(this); }
static VTag BitwiseOr(VTag const vTags[], int size = 4);
};
struct ETag {
@ -134,6 +138,10 @@ public:
ETagSize _infSharp : 1; // fixed
ETagSize _semiSharp : 1; // variable
// Alternate constructor and accessor for dealing with integer bits directly:
explicit ETag(ETagSize bits) { *this = *reinterpret_cast<ETag const *>(&bits); }
ETagSize getBits() const { return *reinterpret_cast<ETagSize const *>(this); }
static ETag BitwiseOr(ETag const eTags[], int size = 4);
};
struct FTag {