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Add Chromium-only Blender WebEngine parity work

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2026-08-12 04:47:48 -04:00
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blender-5.2.0/extern/opensubdiv-source/opensubdiv/vtr/fvarLevel.h vendored Normal file
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//
// Copyright 2014 DreamWorks Animation LLC.
//
// Licensed under the terms set forth in the LICENSE.txt file available at
// https://opensubdiv.org/license.
//
#ifndef OPENSUBDIV3_VTR_FVAR_LEVEL_H
#define OPENSUBDIV3_VTR_FVAR_LEVEL_H
#include "../version.h"
#include "../sdc/types.h"
#include "../sdc/crease.h"
#include "../sdc/options.h"
#include "../vtr/types.h"
#include "../vtr/level.h"
#include <vector>
#include <cassert>
#include <cstring>
namespace OpenSubdiv {
namespace OPENSUBDIV_VERSION {
namespace Vtr {
namespace internal {
//
// FVarLevel:
// A "face-varying channel" includes the topology for a set of face-varying
// data, relative to the topology of the Level with which it is associated.
//
// Analogous to a set of vertices and face-vertices that define the topology for
// the geometry, a channel requires a set of "values" and "face-values". The
// "values" are indices of entries in a set of face-varying data, just as vertices
// are indices into a set of vertex data. The face-values identify a value for
// each vertex of the face, and so define topology for the values that may be
// unique to each channel.
//
// In addition to the value size and the vector of face-values (which matches the
// size of the geometry's face-vertices), tags are associated with each component
// to identify deviations of the face-varying topology from the vertex topology.
// And since there may be a one-to-many mapping between vertices and face-varying
// values, that mapping is also allocated.
//
// It turns out that the mapping used is able to completely encode the set of
// face-values and is more amenable to refinement. Currently the face-values
// take up almost half the memory of this representation, so if memory does
// become a concern, we do not need to store them. The only reason we do so now
// is that the face-value interface for specifying base topology and inspecting
// subsequent levels is very familiar to that of face-vertices for clients. So
// having them available for such access is convenient.
//
// Regarding scope and access...
// Unclear at this early state, but leaning towards nesting this class within
// Level, given the intimate dependency between the two.
// Everything is being declared public for now to facilitate access until it's
// clearer how this functionality will be provided.
//
class FVarLevel {
public:
//
// Component tags -- trying to minimize the types needed here:
//
// Tag per Edge:
// - facilitates topological analysis around each vertex
// - required during refinement to spawn one or more edge-values
//
struct ETag {
ETag() { }
void clear() { std::memset(this, 0, sizeof(ETag)); }
typedef unsigned char ETagSize;
ETagSize _mismatch : 1; // local FVar topology does not match
ETagSize _disctsV0 : 1; // discontinuous at vertex 0
ETagSize _disctsV1 : 1; // discontinuous at vertex 1
ETagSize _linear : 1; // linear boundary constraints
Level::ETag combineWithLevelETag(Level::ETag) const;
};
//
// Tag per Value:
// - informs both refinement and interpolation
// - every value spawns a child value in refinement
// - includes a subset of Level::VTag to be later combined with a VTag
//
struct ValueTag {
ValueTag() { }
void clear() { std::memset(this, 0, sizeof(ValueTag)); }
bool isMismatch() const { return _mismatch; }
bool isCrease() const { return _crease; }
bool isCorner() const { return !_crease; }
bool isSemiSharp() const { return _semiSharp; }
bool isInfSharp() const { return !_semiSharp && !_crease; }
bool isDepSharp() const { return _depSharp; }
bool hasCreaseEnds() const { return _crease || _semiSharp; }
bool hasInfSharpEdges() const { return _infSharpEdges; }
bool hasInfIrregularity() const { return _infIrregular; }
typedef unsigned char ValueTagSize;
// If there is no mismatch, no other members should be inspected
ValueTagSize _mismatch : 1; // local FVar topology does not match
ValueTagSize _xordinary : 1; // local FVar topology is extra-ordinary
ValueTagSize _nonManifold : 1; // local FVar topology is non-manifold
ValueTagSize _crease : 1; // value is a crease, otherwise a corner
ValueTagSize _semiSharp : 1; // value is a corner decaying to crease
ValueTagSize _depSharp : 1; // value is a corner by dependency on another
ValueTagSize _infSharpEdges : 1; // value is a corner by inf-sharp features
ValueTagSize _infIrregular : 1; // value span includes inf-sharp irregularity
Level::VTag combineWithLevelVTag(Level::VTag) const;
// Alternate constructor and accessor for dealing with integer bits directly:
explicit ValueTag(ValueTagSize bits) {
std::memcpy(this, &bits, sizeof(bits));
}
ValueTagSize getBits() const {
ValueTagSize bits;
std::memcpy(&bits, this, sizeof(bits));
return bits;
}
};
typedef Vtr::ConstArray<ValueTag> ConstValueTagArray;
typedef Vtr::Array<ValueTag> ValueTagArray;
//
// Simple struct containing the "end faces" of a crease, i.e. the faces which
// contain the FVar values to be used when interpolating the crease. (Prefer
// the struct over std::pair for its member names)
//
struct CreaseEndPair {
LocalIndex _startFace;
LocalIndex _endFace;
};
typedef Vtr::ConstArray<CreaseEndPair> ConstCreaseEndPairArray;
typedef Vtr::Array<CreaseEndPair> CreaseEndPairArray;
typedef LocalIndex Sibling;
typedef ConstLocalIndexArray ConstSiblingArray;
typedef LocalIndexArray SiblingArray;
public:
FVarLevel(Level const& level);
~FVarLevel();
// Queries for the entire channel:
Level const& getLevel() const { return _level; }
int getNumValues() const { return _valueCount; }
int getNumFaceValuesTotal() const { return (int) _faceVertValues.size(); }
bool isLinear() const { return _isLinear; }
bool hasLinearBoundaries() const { return _hasLinearBoundaries; }
bool hasSmoothBoundaries() const { return ! _hasLinearBoundaries; }
bool hasCreaseEnds() const { return hasSmoothBoundaries(); }
Sdc::Options getOptions() const { return _options; }
// Queries per face:
ConstIndexArray getFaceValues(Index fIndex) const;
IndexArray getFaceValues(Index fIndex);
// Queries per edge:
ETag getEdgeTag(Index eIndex) const { return _edgeTags[eIndex]; }
bool edgeTopologyMatches(Index eIndex) const { return !getEdgeTag(eIndex)._mismatch; }
// Queries per vertex (and its potential sibling values):
int getNumVertexValues(Index v) const { return _vertSiblingCounts[v]; }
Index getVertexValueOffset(Index v, Sibling i = 0) const { return _vertSiblingOffsets[v] + i; }
Index getVertexValue(Index v, Sibling i = 0) const { return _vertValueIndices[getVertexValueOffset(v,i)]; }
Index findVertexValueIndex(Index vertexIndex, Index valueIndex) const;
// Methods to access/modify array properties per vertex:
ConstIndexArray getVertexValues(Index vIndex) const;
IndexArray getVertexValues(Index vIndex);
ConstValueTagArray getVertexValueTags(Index vIndex) const;
ValueTagArray getVertexValueTags(Index vIndex);
ConstCreaseEndPairArray getVertexValueCreaseEnds(Index vIndex) const;
CreaseEndPairArray getVertexValueCreaseEnds(Index vIndex);
ConstSiblingArray getVertexFaceSiblings(Index vIndex) const;
SiblingArray getVertexFaceSiblings(Index vIndex);
// Queries per value:
ValueTag getValueTag(Index valueIndex) const { return _vertValueTags[valueIndex]; }
bool valueTopologyMatches(Index valueIndex) const { return !getValueTag(valueIndex)._mismatch; }
CreaseEndPair getValueCreaseEndPair(Index valueIndex) const { return _vertValueCreaseEnds[valueIndex]; }
// Tag queries related to faces (use Level methods for those returning Level::VTag/ETag)
void getFaceValueTags(Index faceIndex, ValueTag valueTags[]) const;
ValueTag getFaceCompositeValueTag(Index faceIndex) const;
// Higher-level topological queries, i.e. values in a neighborhood:
void getEdgeFaceValues(Index eIndex, int fIncToEdge, Index valuesPerVert[2]) const;
void getVertexEdgeValues(Index vIndex, Index valuesPerEdge[]) const;
void getVertexCreaseEndValues(Index vIndex, Sibling sibling, Index endValues[2]) const;
// Initialization and allocation helpers:
void setOptions(Sdc::Options const& options);
void resizeVertexValues(int numVertexValues);
void resizeValues(int numValues);
void resizeComponents();
// Topological analysis methods -- tagging and face-value population:
void completeTopologyFromFaceValues(int regBoundaryValence);
void initializeFaceValuesFromFaceVertices();
void initializeFaceValuesFromVertexFaceSiblings();
struct ValueSpan;
void gatherValueSpans(Index vIndex, ValueSpan * vValueSpans) const;
// Debugging methods:
bool validate() const;
void print() const;
void buildFaceVertexSiblingsFromVertexFaceSiblings(std::vector<Sibling>& fvSiblings) const;
private:
// Just as Refinements build Levels, FVarRefinements build FVarLevels...
friend class FVarRefinement;
Level const & _level;
// Linear interpolation options vary between channels:
Sdc::Options _options;
bool _isLinear;
bool _hasLinearBoundaries;
bool _hasDependentSharpness;
int _valueCount;
//
// Vectors recording face-varying topology including tags that help propagate
// data through the refinement hierarchy. Vectors are not sparse but most use
// 8-bit values relative to the local topology.
//
// The vector of face-values is actually redundant here, but is constructed as
// it is most convenient for clients. It represents almost half the memory of
// the topology (4 32-bit integers per face) and not surprisingly, populating
// it takes a considerable amount of the refinement time (1/3). We can reduce
// both if we are willing to compute these on demand for clients.
//
// Per-face (matches face-verts of corresponding level):
std::vector<Index> _faceVertValues;
// Per-edge:
std::vector<ETag> _edgeTags;
// Per-vertex:
std::vector<Sibling> _vertSiblingCounts;
std::vector<int> _vertSiblingOffsets;
std::vector<Sibling> _vertFaceSiblings;
// Per-value:
std::vector<Index> _vertValueIndices;
std::vector<ValueTag> _vertValueTags;
std::vector<CreaseEndPair> _vertValueCreaseEnds;
};
//
// Access/modify the values associated with each face:
//
inline ConstIndexArray
FVarLevel::getFaceValues(Index fIndex) const {
int vCount = _level.getNumFaceVertices(fIndex);
int vOffset = _level.getOffsetOfFaceVertices(fIndex);
return ConstIndexArray(&_faceVertValues[vOffset], vCount);
}
inline IndexArray
FVarLevel::getFaceValues(Index fIndex) {
int vCount = _level.getNumFaceVertices(fIndex);
int vOffset = _level.getOffsetOfFaceVertices(fIndex);
return IndexArray(&_faceVertValues[vOffset], vCount);
}
inline FVarLevel::ConstSiblingArray
FVarLevel::getVertexFaceSiblings(Index vIndex) const {
int vCount = _level.getNumVertexFaces(vIndex);
int vOffset = _level.getOffsetOfVertexFaces(vIndex);
return ConstSiblingArray(&_vertFaceSiblings[vOffset], vCount);
}
inline FVarLevel::SiblingArray
FVarLevel::getVertexFaceSiblings(Index vIndex) {
int vCount = _level.getNumVertexFaces(vIndex);
int vOffset = _level.getOffsetOfVertexFaces(vIndex);
return SiblingArray(&_vertFaceSiblings[vOffset], vCount);
}
inline ConstIndexArray
FVarLevel::getVertexValues(Index vIndex) const
{
int vCount = getNumVertexValues(vIndex);
int vOffset = getVertexValueOffset(vIndex);
return ConstIndexArray(&_vertValueIndices[vOffset], vCount);
}
inline IndexArray
FVarLevel::getVertexValues(Index vIndex)
{
int vCount = getNumVertexValues(vIndex);
int vOffset = getVertexValueOffset(vIndex);
return IndexArray(&_vertValueIndices[vOffset], vCount);
}
inline FVarLevel::ConstValueTagArray
FVarLevel::getVertexValueTags(Index vIndex) const
{
int vCount = getNumVertexValues(vIndex);
int vOffset = getVertexValueOffset(vIndex);
return ConstValueTagArray(&_vertValueTags[vOffset], vCount);
}
inline FVarLevel::ValueTagArray
FVarLevel::getVertexValueTags(Index vIndex)
{
int vCount = getNumVertexValues(vIndex);
int vOffset = getVertexValueOffset(vIndex);
return ValueTagArray(&_vertValueTags[vOffset], vCount);
}
inline FVarLevel::ConstCreaseEndPairArray
FVarLevel::getVertexValueCreaseEnds(Index vIndex) const
{
int vCount = getNumVertexValues(vIndex);
int vOffset = getVertexValueOffset(vIndex);
return ConstCreaseEndPairArray(&_vertValueCreaseEnds[vOffset], vCount);
}
inline FVarLevel::CreaseEndPairArray
FVarLevel::getVertexValueCreaseEnds(Index vIndex)
{
int vCount = getNumVertexValues(vIndex);
int vOffset = getVertexValueOffset(vIndex);
return CreaseEndPairArray(&_vertValueCreaseEnds[vOffset], vCount);
}
inline Index
FVarLevel::findVertexValueIndex(Index vertexIndex, Index valueIndex) const {
if (_level.getDepth() > 0) return valueIndex;
Index vvIndex = getVertexValueOffset(vertexIndex);
while (_vertValueIndices[vvIndex] != valueIndex) {
++ vvIndex;
}
return vvIndex;
}
//
// Methods related to tagging:
//
inline Level::ETag
FVarLevel::ETag::combineWithLevelETag(Level::ETag levelTag) const
{
if (this->_mismatch) {
levelTag._boundary = true;
levelTag._infSharp = true;
}
return levelTag;
}
inline Level::VTag
FVarLevel::ValueTag::combineWithLevelVTag(Level::VTag levelTag) const
{
if (this->_mismatch) {
//
// Semi-sharp FVar values are always tagged and treated as corners
// (at least three sharp edges (two boundary edges and one interior
// semi-sharp) and/or vertex is semi-sharp) until the sharpness has
// decayed, but they ultimately lie on the inf-sharp crease of the
// FVar boundary. Consider this when tagging inf-sharp features.
//
if (this->isCorner()) {
levelTag._rule = (Level::VTag::VTagSize) Sdc::Crease::RULE_CORNER;
} else {
levelTag._rule = (Level::VTag::VTagSize) Sdc::Crease::RULE_CREASE;
}
if (this->isCrease() || this->isSemiSharp()) {
levelTag._infSharp = false;
levelTag._infSharpCrease = true;
levelTag._corner = false;
} else {
levelTag._infSharp = true;
levelTag._infSharpCrease = false;
levelTag._corner = !this->_infIrregular && !this->_infSharpEdges;
}
levelTag._infSharpEdges = true;
levelTag._infIrregular = this->_infIrregular;
levelTag._boundary = true;
levelTag._xordinary = this->_xordinary;
levelTag._nonManifold |= this->_nonManifold;
}
return levelTag;
}
} // end namespace internal
} // end namespace Vtr
} // end namespace OPENSUBDIV_VERSION
using namespace OPENSUBDIV_VERSION;
} // end namespace OpenSubdiv
#endif /* OPENSUBDIV3_VTR_FVAR_LEVEL_H */