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OpenSubdiv/opensubdiv/far/patchTableFactory.cpp
barfowl ad6b1f9117 Eliminate or encapsulate ICC pragmas: 
- eliminated need for disabling warning 177 in far/patchTableFactory.cpp
    - encapsulated all floating point equality tests (1572) in local functions
    - bracketed all ICC specific warning pragmas with #ifdef __INTEL_COMPILER
    - avoided GCC's stricter shadowing warning in vtr/array.h
2015-07-20 17:56:00 -07:00

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//
// Copyright 2013 Pixar
//
// Licensed under the Apache License, Version 2.0 (the "Apache License")
// with the following modification; you may not use this file except in
// compliance with the Apache License and the following modification to it:
// Section 6. Trademarks. is deleted and replaced with:
//
// 6. Trademarks. This License does not grant permission to use the trade
// names, trademarks, service marks, or product names of the Licensor
// and its affiliates, except as required to comply with Section 4(c) of
// the License and to reproduce the content of the NOTICE file.
//
// You may obtain a copy of the Apache License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the Apache License with the above modification is
// distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the Apache License for the specific
// language governing permissions and limitations under the Apache License.
//
#include "../far/patchTableFactory.h"
#include "../far/error.h"
#include "../far/ptexIndices.h"
#include "../far/topologyRefiner.h"
#include "../vtr/level.h"
#include "../vtr/fvarLevel.h"
#include "../vtr/refinement.h"
#include "../far/endCapBSplineBasisPatchFactory.h"
#include "../far/endCapGregoryBasisPatchFactory.h"
#include "../far/endCapLegacyGregoryPatchFactory.h"
#include <algorithm>
#include <cassert>
#include <cstring>
namespace OpenSubdiv {
namespace OPENSUBDIV_VERSION {
namespace {
//
// A convenience container for the different types of feature adaptive patches.
// Each instance associates a value of the template parameter type with each
// patch type.
//
template <class TYPE>
struct PatchTypes {
TYPE R, // regular patch
G, // gregory patch
GB, // gregory boundary patch
GP; // gregory basis patch
PatchTypes() { std::memset(this, 0, sizeof(PatchTypes<TYPE>)); }
TYPE & getValue( Far::PatchDescriptor desc ) {
switch (desc.GetType()) {
case Far::PatchDescriptor::REGULAR : return R;
case Far::PatchDescriptor::GREGORY : return G;
case Far::PatchDescriptor::GREGORY_BOUNDARY : return GB;
case Far::PatchDescriptor::GREGORY_BASIS : return GP;
default : assert(0);
}
// can't be reached (suppress compiler warning)
return R;
}
};
typedef PatchTypes<Far::Index *> PatchCVPointers;
typedef PatchTypes<Far::PatchParam *> PatchParamPointers;
typedef PatchTypes<Far::Index *> SharpnessIndexPointers;
typedef PatchTypes<Far::Index> PatchFVarOffsets;
typedef PatchTypes<Far::Index **> PatchFVarPointers;
// Helpers for compiler warnings and floating point equality tests
#ifdef __INTEL_COMPILER
#pragma warning (push)
#pragma warning disable 1572
#endif
inline bool isSharpnessEqual(float s1, float s2) { return (s1 == s2); }
#ifdef __INTEL_COMPILER
#pragma warning (pop)
#endif
} // namespace anon
namespace Far {
void
PatchTableFactory::PatchFaceTag::clear() {
std::memset(this, 0, sizeof(*this));
}
void
PatchTableFactory::PatchFaceTag::assignBoundaryPropertiesFromEdgeMask(int boundaryEdgeMask) {
//
// The number of rotations to apply for boundary or corner patches varies on both
// where the boundary/corner occurs and whether boundary or corner -- so using a
// 4-bit mask should be sufficient to quickly determine all cases:
//
// Note that we currently expect patches with multiple boundaries to have already
// been isolated, so asserts are applied for such unexpected cases.
//
// Is the compiler going to build the 16-entry lookup table here, or should we do
// it ourselves?
//
_hasBoundaryEdge = true;
_boundaryMask = boundaryEdgeMask;
switch (boundaryEdgeMask) {
case 0x0: _boundaryCount = 0, _boundaryIndex = 0, _hasBoundaryEdge = false; break; // no boundaries
case 0x1: _boundaryCount = 1, _boundaryIndex = 0; break; // boundary edge 0
case 0x2: _boundaryCount = 1, _boundaryIndex = 1; break; // boundary edge 1
case 0x3: _boundaryCount = 2, _boundaryIndex = 1; break; // corner/crease vertex 1
case 0x4: _boundaryCount = 1, _boundaryIndex = 2; break; // boundary edge 2
case 0x5: assert(false); break; // N/A - opposite boundary edges
case 0x6: _boundaryCount = 2, _boundaryIndex = 2; break; // corner/crease vertex 2
case 0x7: assert(false); break; // N/A - three boundary edges
case 0x8: _boundaryCount = 1, _boundaryIndex = 3; break; // boundary edge 3
case 0x9: _boundaryCount = 2, _boundaryIndex = 0; break; // corner/crease vertex 0
case 0xa: assert(false); break; // N/A - opposite boundary edges
case 0xb: assert(false); break; // N/A - three boundary edges
case 0xc: _boundaryCount = 2, _boundaryIndex = 3; break; // corner/crease vertex 3
case 0xd: assert(false); break; // N/A - three boundary edges
case 0xe: assert(false); break; // N/A - three boundary edges
case 0xf: assert(false); break; // N/A - all boundaries
default: assert(false); break;
}
}
void
PatchTableFactory::PatchFaceTag::assignBoundaryPropertiesFromVertexMask(int boundaryVertexMask) {
//
// This is strictly needed for the irregular case when a vertex is a boundary in
// the presence of no boundary edges -- an extra-ordinary face with only one corner
// on the boundary.
//
// Its unclear at this point if patches with more than one such vertex are supported
// (if so, how do we deal with rotations) so for now we only allow one such vertex
// and assert for all other cases.
//
assert(_hasBoundaryEdge == false);
_boundaryMask = boundaryVertexMask;
switch (boundaryVertexMask) {
case 0x0: _boundaryCount = 0; break; // no boundaries
case 0x1: _boundaryCount = 1, _boundaryIndex = 0; break; // boundary vertex 0
case 0x2: _boundaryCount = 1, _boundaryIndex = 1; break; // boundary vertex 1
case 0x3: assert(false); break;
case 0x4: _boundaryCount = 1, _boundaryIndex = 2; break; // boundary vertex 2
case 0x5: assert(false); break;
case 0x6: assert(false); break;
case 0x7: assert(false); break;
case 0x8: _boundaryCount = 1, _boundaryIndex = 3; break; // boundary vertex 3
case 0x9: assert(false); break;
case 0xa: assert(false); break;
case 0xb: assert(false); break;
case 0xc: assert(false); break;
case 0xd: assert(false); break;
case 0xe: assert(false); break;
case 0xf: assert(false); break;
default: assert(false); break;
}
}
//
// Trivial anonymous helper functions:
//
static inline void
offsetAndPermuteIndices(Far::Index const indices[], int count,
Far::Index offset, int const permutation[],
Far::Index result[]) {
// The patch vertices for boundary and corner patches
// are assigned index values even though indices will
// be undefined along boundary and corner edges.
// When the resulting patch table is going to be used
// as indices for drawing, it is convenient for invalid
// indices to be replaced with known good values, such
// as the first un-permuted index, which is the index
// of the first vertex of the patch face.
Far::Index knownGoodIndex = indices[0];
if (permutation) {
for (int i = 0; i < count; ++i) {
if (permutation[i] < 0) {
result[i] = offset + knownGoodIndex;
} else {
result[i] = offset + indices[permutation[i]];
}
}
} else if (offset) {
for (int i = 0; i < count; ++i) {
result[i] = offset + indices[i];
}
} else {
std::memcpy(result, indices, count * sizeof(Far::Index));
}
}
//
// Face-varying channel cursor
//
// This cursors allows to iterate over a set of selected face-varying channels.
// If client-code specifies an optional sub-set of the list of channels carried
// by the TopologyRefiner, the cursor can traverse this list and return both its
// current position in the sub-set and the original index of the corresponding
// channel in the TopologyRefiner.
//
class FVarChannelCursor {
public:
FVarChannelCursor(TopologyRefiner const & refiner,
PatchTableFactory::Options options)
: _channelIndices(0)
{
if (options.generateFVarTables) {
// If client-code does not select specific channels, default to all
// the channels in the refiner.
if (options.numFVarChannels==-1) {
_numChannels = refiner.GetNumFVarChannels();
_channelIndices = 0;
} else {
assert(options.numFVarChannels<=refiner.GetNumFVarChannels());
_numChannels = options.numFVarChannels;
_channelIndices = options.fvarChannelIndices;
}
} else {
_numChannels = 0;
}
_currentChannel = this->begin();
}
// Increment cursor
FVarChannelCursor & operator++() {
++_currentChannel;
return *this;
}
// Assign a position to a cursor
FVarChannelCursor & operator = (int currentChannel) {
_currentChannel = currentChannel;
return *this;
}
// Compare cursor positions
bool operator != (int posArg) {
return _currentChannel < posArg;
}
// Return FVar channel index in the TopologyRefiner list
// XXXX use something better than dereferencing operator maybe ?
int operator*() {
assert(_currentChannel<_numChannels);
// If the cursor is iterating over a sub-set of channels, return the
// channel index from the sub-set, otherwise use the current cursor
// position as channel index.
return _channelIndices ?
_channelIndices[_currentChannel] : _currentChannel;
}
int pos() const { return _currentChannel; }
int begin() const { return 0; }
int end() const { return _numChannels; }
int size() const { return _numChannels; }
private:
int _numChannels, // total number of channels
_currentChannel; // current cursor position
int const * _channelIndices; // list of selected channel indices
};
//
// Adaptive Context
//
// Helper class aggregating transient contextual data structures during the
// creation of feature adaptive patch table. The structure simplifies
// the function prototypes of high-level private methods in the factory.
// This helps keeping the factory class stateless.
//
// Note : struct members are not re-entrant nor are they intended to be !
//
struct PatchTableFactory::AdaptiveContext {
public:
AdaptiveContext(TopologyRefiner const & refiner, Options options);
TopologyRefiner const & refiner;
Options const options;
// The patch table being created
PatchTable * table;
public:
//
// Vertex
//
// Counters accumulating each type of patches during topology traversal
PatchTypes<int> patchInventory;
// Bit tags accumulating patch attributes during topology traversal
PatchTagVector patchTags;
public:
//
// Face-varying
//
// True if face-varying patches need to be generated for this topology
bool RequiresFVarPatches() const;
// A cursor to iterate through the face-varying channels requested
// by client-code
FVarChannelCursor fvarChannelCursor;
};
// Constructor
PatchTableFactory::AdaptiveContext::AdaptiveContext(
TopologyRefiner const & ref, Options opts) :
refiner(ref), options(opts), table(0),
fvarChannelCursor(ref, opts) {
}
bool
PatchTableFactory::AdaptiveContext::RequiresFVarPatches() const {
return (fvarChannelCursor.size() > 0);
}
//
// Reserves tables based on the contents of the PatchArrayVector in the PatchTable:
//
void
PatchTableFactory::allocateVertexTables(PatchTable * table, int /* nlevels */, bool hasSharpness) {
int ncvs = 0, npatches = 0;
for (int i=0; i<table->GetNumPatchArrays(); ++i) {
npatches += table->GetNumPatches(i);
ncvs += table->GetNumControlVertices(i);
}
if (ncvs==0 or npatches==0)
return;
table->_patchVerts.resize( ncvs );
table->_paramTable.resize( npatches );
if (hasSharpness) {
table->_sharpnessIndices.resize( npatches, Vtr::INDEX_INVALID );
}
}
//
// Allocate face-varying tables
//
void
PatchTableFactory::allocateFVarChannels(TopologyRefiner const & refiner,
Options options, int npatches, PatchTable * table) {
assert(options.generateFVarTables and
refiner.GetNumFVarChannels()>0 and npatches>0 and table);
// Create a channel cursor to iterate over client-selected channels or
// default to the channels found in the TopologyRefiner
FVarChannelCursor fvc(refiner, options);
if (fvc.size()==0) {
return;
}
table->allocateFVarPatchChannels(fvc.size());
// Iterate with the cursor to initialize each channel
for (fvc=fvc.begin(); fvc!=fvc.end(); ++fvc) {
Sdc::Options::FVarLinearInterpolation interpolation =
refiner.GetFVarLinearInterpolation(*fvc);
table->setFVarPatchChannelLinearInterpolation(interpolation, fvc.pos());
int nverts = 0;
PatchDescriptor::Type type = options.triangulateQuads ?
PatchDescriptor::TRIANGLES : PatchDescriptor::QUADS;
nverts =
npatches * PatchDescriptor::GetNumFVarControlVertices(type);
table->allocateFVarPatchChannelValues(npatches, nverts, fvc.pos());
}
}
// gather face-varying patch points
int
PatchTableFactory::gatherFVarData(AdaptiveContext & context, int level,
Index faceIndex, Index levelFaceOffset, int rotation,
Index const * levelFVarVertOffsets, Index fofss, Index ** fptrs) {
(void)levelFaceOffset; // not used
(void)fofss; // not used
if (not context.RequiresFVarPatches()) {
return 0;
}
TopologyRefiner const & refiner = context.refiner;
// Iterate over valid FVar channels (if any)
FVarChannelCursor & fvc = context.fvarChannelCursor;
for (fvc=fvc.begin(); fvc!=fvc.end(); ++fvc) {
Vtr::internal::Level const & vtxLevel = refiner.getLevel(level);
Vtr::internal::FVarLevel const & fvarLevel = vtxLevel.getFVarLevel(*fvc);
//
// Bi-linear patches
//
ConstIndexArray fvarValues = fvarLevel.getFaceValues(faceIndex);
// Store verts values directly in non-sparse context channel arrays
for (int vert=0; vert<fvarValues.size(); ++vert) {
fptrs[fvc.pos()][vert] =
levelFVarVertOffsets[fvc.pos()] + fvarValues[(vert+rotation)%4];
}
fptrs[fvc.pos()]+=fvarValues.size();
}
return 1;
}
//
// Populates the PatchParam for the given face, returning
// a pointer to the next entry
//
PatchParam *
PatchTableFactory::computePatchParam(
TopologyRefiner const & refiner, PtexIndices const &ptexIndices,
int depth, Vtr::Index faceIndex, int boundaryMask,
int transitionMask, PatchParam *param) {
if (param == NULL) return NULL;
// Move up the hierarchy accumulating u,v indices to the coarse level:
int childIndexInParent = 0,
u = 0,
v = 0,
ofs = 1;
bool nonquad = (refiner.GetLevel(depth).GetFaceVertices(faceIndex).size() != 4);
for (int i = depth; i > 0; --i) {
Vtr::internal::Refinement const& refinement = refiner.getRefinement(i-1);
Vtr::internal::Level const& parentLevel = refiner.getLevel(i-1);
Vtr::Index parentFaceIndex = refinement.getChildFaceParentFace(faceIndex);
childIndexInParent = refinement.getChildFaceInParentFace(faceIndex);
if (parentLevel.getFaceVertices(parentFaceIndex).size() == 4) {
switch ( childIndexInParent ) {
case 0 : break;
case 1 : { u+=ofs; } break;
case 2 : { u+=ofs; v+=ofs; } break;
case 3 : { v+=ofs; } break;
}
ofs = (unsigned short)(ofs << 1);
} else {
nonquad = true;
// If the root face is not a quad, we need to offset the ptex index
// CCW to match the correct child face
Vtr::ConstIndexArray children = refinement.getFaceChildFaces(parentFaceIndex);
for (int j=0; j<children.size(); ++j) {
if (children[j]==faceIndex) {
childIndexInParent = j;
break;
}
}
}
faceIndex = parentFaceIndex;
}
Vtr::Index ptexIndex = ptexIndices.GetFaceId(faceIndex);
assert(ptexIndex!=-1);
if (nonquad) {
ptexIndex+=childIndexInParent;
--depth;
}
param->Set(ptexIndex, (short)u, (short)v, (unsigned short) depth, nonquad,
(unsigned short) boundaryMask, (unsigned short) transitionMask);
return ++param;
}
//
// Indexing sharpnesses
//
inline int
assignSharpnessIndex(float sharpness, std::vector<float> & sharpnessValues) {
// linear search
for (int i=0; i<(int)sharpnessValues.size(); ++i) {
if (isSharpnessEqual(sharpnessValues[i], sharpness)) {
return i;
}
}
sharpnessValues.push_back(sharpness);
return (int)sharpnessValues.size()-1;
}
//
// We should be able to use a single Create() method for both the adaptive and uniform
// cases. In the past, more additional arguments were passed to the uniform version,
// but that may no longer be necessary (see notes in the uniform version below)...
//
PatchTable *
PatchTableFactory::Create(TopologyRefiner const & refiner, Options options) {
if (refiner.IsUniform()) {
return createUniform(refiner, options);
} else {
return createAdaptive(refiner, options);
}
}
PatchTable *
PatchTableFactory::createUniform(TopologyRefiner const & refiner, Options options) {
assert(refiner.IsUniform());
// ensure that triangulateQuads is only set for quadrilateral schemes
options.triangulateQuads &= (refiner.GetSchemeType()==Sdc::SCHEME_BILINEAR or
refiner.GetSchemeType()==Sdc::SCHEME_CATMARK);
int maxvalence = refiner.GetMaxValence(),
maxlevel = refiner.GetMaxLevel(),
firstlevel = options.generateAllLevels ? 0 : maxlevel,
nlevels = maxlevel-firstlevel+1;
PtexIndices ptexIndices(refiner);
PatchDescriptor::Type ptype = PatchDescriptor::NON_PATCH;
if (options.triangulateQuads) {
ptype = PatchDescriptor::TRIANGLES;
} else {
switch (refiner.GetSchemeType()) {
case Sdc::SCHEME_BILINEAR :
case Sdc::SCHEME_CATMARK : ptype = PatchDescriptor::QUADS; break;
case Sdc::SCHEME_LOOP : ptype = PatchDescriptor::TRIANGLES; break;
}
}
assert(ptype!=PatchDescriptor::NON_PATCH);
//
// Create the instance of the table and allocate and initialize its members.
//
PatchTable * table = new PatchTable(maxvalence);
table->_numPtexFaces = ptexIndices.GetNumFaces();
table->reservePatchArrays(nlevels);
PatchDescriptor desc(ptype);
// generate patch arrays
for (int level=firstlevel, poffset=0, voffset=0; level<=maxlevel; ++level) {
TopologyLevel const & refLevel = refiner.GetLevel(level);
int npatches = refLevel.GetNumFaces();
if (refiner.HasHoles()) {
for (int i = npatches - 1; i >= 0; --i) {
npatches -= refLevel.IsFaceHole(i);
}
}
assert(npatches>=0);
if (options.triangulateQuads)
npatches *= 2;
if (level>=firstlevel) {
table->pushPatchArray(desc, npatches, &voffset, &poffset, 0);
}
}
// Allocate various tables
allocateVertexTables( table, 0, /*hasSharpness=*/false );
FVarChannelCursor fvc(refiner, options);
bool generateFVarPatches = (options.generateFVarTables and fvc.size()>0);
if (generateFVarPatches) {
int npatches = table->GetNumPatchesTotal();
allocateFVarChannels(refiner, options, npatches, table);
assert(fvc.size() == table->GetNumFVarChannels());
}
//
// Now populate the patches:
//
Index * iptr = &table->_patchVerts[0];
PatchParam * pptr = &table->_paramTable[0];
Index ** fptr = 0;
Index levelVertOffset = options.generateAllLevels ?
0 : refiner.GetLevel(0).GetNumVertices();
Index * levelFVarVertOffsets = 0;
if (generateFVarPatches) {
levelFVarVertOffsets = (Index *)alloca(fvc.size()*sizeof(Index));
memset(levelFVarVertOffsets, 0, fvc.size()*sizeof(Index));
fptr = (Index **)alloca(fvc.size()*sizeof(Index *));
for (fvc=fvc.begin(); fvc!=fvc.end(); ++fvc) {
fptr[fvc.pos()] = table->getFVarValues(fvc.pos()).begin();
}
}
for (int level=1; level<=maxlevel; ++level) {
TopologyLevel const & refLevel = refiner.GetLevel(level);
int nfaces = refLevel.GetNumFaces();
if (level>=firstlevel) {
for (int face=0; face<nfaces; ++face) {
if (refiner.HasHoles() and refLevel.IsFaceHole(face)) {
continue;
}
ConstIndexArray fverts = refLevel.GetFaceVertices(face);
for (int vert=0; vert<fverts.size(); ++vert) {
*iptr++ = levelVertOffset + fverts[vert];
}
pptr = computePatchParam(refiner, ptexIndices, level, face, /*boundary*/0, /*transition*/0, pptr);
if (generateFVarPatches) {
for (fvc=fvc.begin(); fvc!=fvc.end(); ++fvc) {
ConstIndexArray fvalues = refLevel.GetFaceFVarValues(face, *fvc);
for (int vert=0; vert<fvalues.size(); ++vert) {
assert((levelVertOffset + fvalues[vert]) < (int)table->getFVarValues(fvc.pos()).size());
fptr[fvc.pos()][vert] = levelFVarVertOffsets[fvc.pos()] + fvalues[vert];
}
fptr[fvc.pos()]+=fvalues.size();
}
}
if (options.triangulateQuads) {
// Triangulate the quadrilateral: {v0,v1,v2,v3} -> {v0,v1,v2},{v3,v0,v2}.
*iptr = *(iptr - 4); // copy v0 index
++iptr;
*iptr = *(iptr - 3); // copy v2 index
++iptr;
*pptr = *(pptr - 1); // copy first patch param
++pptr;
if (generateFVarPatches) {
for (fvc=fvc.begin(); fvc!=fvc.end(); ++fvc) {
*fptr[fvc.pos()] = *(fptr[fvc.pos()]-4); // copy fv0 index
++fptr[fvc.pos()];
*fptr[fvc.pos()] = *(fptr[fvc.pos()]-3); // copy fv2 index
++fptr[fvc.pos()];
}
}
}
}
}
if (options.generateAllLevels) {
levelVertOffset += refiner.GetLevel(level).GetNumVertices();
for (fvc=fvc.begin(); fvc!=fvc.end(); ++fvc) {
levelFVarVertOffsets[fvc.pos()] += refiner.GetLevel(level).GetNumFVarValues(fvc.pos());
}
}
}
return table;
}
PatchTable *
PatchTableFactory::createAdaptive(TopologyRefiner const & refiner, Options options) {
assert(not refiner.IsUniform());
PtexIndices ptexIndices(refiner);
AdaptiveContext context(refiner, options);
//
// First identify the patches -- accumulating the inventory patches for all of the
// different types and information about the patch for each face:
//
identifyAdaptivePatches(context);
//
// Create the instance of the table and allocate and initialize its members based on
// the inventory of patches determined above:
//
int maxValence = refiner.GetMaxValence();
context.table = new PatchTable(maxValence);
// Populate the patch array descriptors
int numPatchArrays = 0;
if (context.patchInventory.R > 0) ++numPatchArrays;
if (context.patchInventory.G > 0) ++numPatchArrays;
if (context.patchInventory.GB > 0) ++numPatchArrays;
if (context.patchInventory.GP > 0) ++numPatchArrays;
context.table->reservePatchArrays(numPatchArrays);
// Sort through the inventory and push back non-empty patch arrays
ConstPatchDescriptorArray const & descs =
PatchDescriptor::GetAdaptivePatchDescriptors(Sdc::SCHEME_CATMARK);
int voffset=0, poffset=0, qoffset=0;
for (int i=0; i<descs.size(); ++i) {
PatchDescriptor desc = descs[i];
context.table->pushPatchArray(desc,
context.patchInventory.getValue(desc), &voffset, &poffset, &qoffset );
}
context.table->_numPtexFaces = ptexIndices.GetNumFaces();
// Allocate various tables
bool hasSharpness = context.options.useSingleCreasePatch;
allocateVertexTables(context.table, 0, hasSharpness);
if (context.RequiresFVarPatches()) {
int npatches = context.table->GetNumPatchesTotal();
allocateFVarChannels(refiner, options, npatches, context.table);
}
//
// Now populate the patches:
//
populateAdaptivePatches(context, ptexIndices);
return context.table;
}
//
// Identify all patches required for faces at all levels -- accumulating the number of patches
// for each type, and retaining enough information for the patch for each face to populate it
// later with no additional analysis.
//
void
PatchTableFactory::identifyAdaptivePatches(AdaptiveContext & context) {
TopologyRefiner const & refiner = context.refiner;
//
// Iterate through the levels of refinement to inspect and tag components with information
// relative to patch generation. We allocate all of the tags locally and use them to
// populate the patches once a complete inventory has been taken and all tables appropriately
// allocated and initialized:
//
// The first Level may have no Refinement if it is the only level -- similarly the last Level
// has no Refinement, so a single level is effectively the last, but with less information
// available in some cases, as it was not generated by refinement.
//
context.patchTags.resize(refiner.GetNumFacesTotal());
PatchFaceTag * levelPatchTags = &context.patchTags[0];
for (int levelIndex = 0; levelIndex < refiner.GetNumLevels(); ++levelIndex) {
Vtr::internal::Level const * level = &refiner.getLevel(levelIndex);
//
// Given components at Level[i], we need to be looking at Refinement[i] -- and not
// [i-1] -- because the Refinement has transitional information for its parent edges
// and faces.
//
// For components in this level, we want to determine:
// - what Edges are "transitional" (already done in Refinement for parent)
// - what Faces are "transitional" (already done in Refinement for parent)
// - what Faces are "complete" (applied to this Level in previous refinement)
//
Vtr::internal::Refinement const * refinement = 0;
Vtr::internal::Refinement::SparseTag const * refinedFaceTags = 0;
if (levelIndex < refiner.GetMaxLevel()) {
refinement = &refiner.getRefinement(levelIndex);
refinedFaceTags = &refinement->getParentFaceSparseTag(0);
}
for (int faceIndex = 0; faceIndex < level->getNumFaces(); ++faceIndex) {
PatchFaceTag & patchTag = levelPatchTags[faceIndex];
patchTag.clear();
patchTag._hasPatch = false;
if (level->isFaceHole(faceIndex)) {
continue;
}
//
// This face does not warrant a patch under the following conditions:
//
// - the face was fully refined into child faces
// - the face is not a quad (should have been refined, so assert)
// - the face is not "complete"
//
// The first is trivially determined, and the second is really redundant. The
// last -- "incompleteness" -- indicates a face that exists to support the limit
// of some neighboring component, and which does not have its own neighborhood
// fully defined for its limit. If any child vertex of a vertex of this face is
// "incomplete" (and all are tagged) the face must be "incomplete", so get the
// "composite" tag which combines bits for all vertices:
//
Vtr::internal::Refinement::SparseTag refinedFaceTag = refinedFaceTags ?
refinedFaceTags[faceIndex] : Vtr::internal::Refinement::SparseTag();
if (refinedFaceTag._selected) {
continue;
}
Vtr::ConstIndexArray fVerts = level->getFaceVertices(faceIndex);
assert(fVerts.size() == 4);
Vtr::internal::Level::VTag compFaceVertTag = level->getFaceCompositeVTag(fVerts);
if (compFaceVertTag._incomplete) {
continue;
}
//
// We have a quad that will be represented as a B-spline or end cap patch. Use
// the "composite" tag again to quickly determine if any vertex is irregular, on
// a boundary, non-manifold, etc.
//
// Inspect the edges for boundaries and transitional edges and pack results into
// 4-bit masks. We detect boundary edges rather than vertices as we hope to
// replace the mask in future with one for infinitely sharp edges -- allowing
// us to detect regular patches and avoid isolation. We still need to account
// for the irregular/xordinary case when a corner vertex is a boundary but there
// are no boundary edges.
//
// As for transition detection, assign the transition properties (even if 0).
//
// NOTE on patches around non-manifold vertices:
// In most cases the use of regular boundary or corner patches is what we want,
// but in some, i.e. when a non-manifold vertex is infinitely sharp, using
// such patches will create some discontinuities. At this point non-manifold
// support is still evolving and is not strictly defined, so this is left to
// a later date to resolve.
//
// NOTE on infinitely sharp (hard) edges:
// We should be able to adapt this later to detect hard (inf-sharp) edges
// rather than just boundary edges -- there is a similar tag per edge. That
// should allow us to generate regular patches for interior hard features.
//
bool hasBoundaryVertex = compFaceVertTag._boundary;
bool hasNonManifoldVertex = compFaceVertTag._nonManifold;
bool hasXOrdinaryVertex = compFaceVertTag._xordinary;
patchTag._hasPatch = true;
patchTag._isRegular = not hasXOrdinaryVertex or hasNonManifoldVertex;
// single crease patch optimization
if (context.options.useSingleCreasePatch and
not hasXOrdinaryVertex and not hasBoundaryVertex and not hasNonManifoldVertex) {
Vtr::ConstIndexArray fEdges = level->getFaceEdges(faceIndex);
Vtr::internal::Level::ETag compFaceETag = level->getFaceCompositeETag(fEdges);
if (compFaceETag._semiSharp or compFaceETag._infSharp) {
float sharpness = 0;
int rotation = 0;
if (level->isSingleCreasePatch(faceIndex, &sharpness, &rotation)) {
// cap sharpness to the max isolation level
float cappedSharpness =
std::min(sharpness, (float)(context.options.maxIsolationLevel - levelIndex));
if (cappedSharpness > 0) {
patchTag._isSingleCrease = true;
patchTag._boundaryIndex = rotation;
}
}
}
}
// Identify boundaries for both regular and xordinary patches -- non-manifold
// edges and vertices are interpreted as boundaries for regular patches
if (hasBoundaryVertex or hasNonManifoldVertex) {
Vtr::ConstIndexArray fEdges = level->getFaceEdges(faceIndex);
int boundaryEdgeMask = ((level->getEdgeTag(fEdges[0])._boundary) << 0) |
((level->getEdgeTag(fEdges[1])._boundary) << 1) |
((level->getEdgeTag(fEdges[2])._boundary) << 2) |
((level->getEdgeTag(fEdges[3])._boundary) << 3);
if (hasNonManifoldVertex) {
int nonManEdgeMask = ((level->getEdgeTag(fEdges[0])._nonManifold) << 0) |
((level->getEdgeTag(fEdges[1])._nonManifold) << 1) |
((level->getEdgeTag(fEdges[2])._nonManifold) << 2) |
((level->getEdgeTag(fEdges[3])._nonManifold) << 3);
boundaryEdgeMask |= nonManEdgeMask;
}
if (boundaryEdgeMask) {
patchTag.assignBoundaryPropertiesFromEdgeMask(boundaryEdgeMask);
} else {
int boundaryVertMask = ((level->getVertexTag(fVerts[0])._boundary) << 0) |
((level->getVertexTag(fVerts[1])._boundary) << 1) |
((level->getVertexTag(fVerts[2])._boundary) << 2) |
((level->getVertexTag(fVerts[3])._boundary) << 3);
if (hasNonManifoldVertex) {
int nonManVertMask = ((level->getVertexTag(fVerts[0])._nonManifold) << 0) |
((level->getVertexTag(fVerts[1])._nonManifold) << 1) |
((level->getVertexTag(fVerts[2])._nonManifold) << 2) |
((level->getVertexTag(fVerts[3])._nonManifold) << 3);
boundaryVertMask |= nonManVertMask;
}
patchTag.assignBoundaryPropertiesFromVertexMask(boundaryVertMask);
}
}
// XXXX (barfowl) -- why are we approximating a smooth x-ordinary corner with
// a sharp corner patch? The boundary/corner points of the regular patch are
// not even made colinear to make it smoother. Something historical here...
//
// So this treatment may become optional in future and is bracketed with a
// condition now for that reason. We approximate x-ordinary smooth corners
// with regular B-spline patches instead of using a Gregory patch. The smooth
// corner must be properly isolated from any other irregular vertices (as it
// will be at any level > 1) otherwise the Gregory patch is necessary.
//
// This flag to be initialized with a future option... ?
bool approxSmoothCornerWithRegularPatch = true;
if (approxSmoothCornerWithRegularPatch) {
if (!patchTag._isRegular and (patchTag._boundaryCount == 2)) {
// We may have a sharp corner opposite/adjacent an xordinary vertex --
// need to make sure there is only one xordinary vertex and that it
// is the corner vertex.
if (levelIndex > 1) {
patchTag._isRegular = true;
} else {
int xordVertex = 0;
int xordCount = 0;
if (level->getVertexTag(fVerts[0])._xordinary) { xordCount++; xordVertex = 0; }
if (level->getVertexTag(fVerts[1])._xordinary) { xordCount++; xordVertex = 1; }
if (level->getVertexTag(fVerts[2])._xordinary) { xordCount++; xordVertex = 2; }
if (level->getVertexTag(fVerts[3])._xordinary) { xordCount++; xordVertex = 3; }
if (xordCount == 1) {
// We require the vertex opposite the xordinary vertex be interior:
if (not level->getVertexTag(fVerts[(xordVertex + 2) % 4])._boundary) {
patchTag._isRegular = true;
}
}
}
}
}
//
// Now that all boundary features have have been identified and tagged, assign
// the transition type for the patch before taking inventory.
//
// Identify and increment counts for regular patches (both non-transitional and
// transitional) and extra-ordinary patches (always non-transitional):
//
patchTag.assignTransitionPropertiesFromEdgeMask(refinedFaceTag._transitional);
if (patchTag._isRegular) {
if (patchTag._boundaryCount == 0) {
context.patchInventory.R++;
} else if (patchTag._boundaryCount == 1) {
context.patchInventory.R++;
} else {
context.patchInventory.R++;
}
} else {
// select endcap patchtype
switch(context.options.GetEndCapType()) {
case Options::ENDCAP_GREGORY_BASIS:
context.patchInventory.GP++;
break;
case Options::ENDCAP_BSPLINE_BASIS:
context.patchInventory.R++;
break;
case Options::ENDCAP_LEGACY_GREGORY:
if (patchTag._boundaryCount == 0) {
context.patchInventory.G++;
} else {
context.patchInventory.GB++;
}
break;
case Options::ENDCAP_BILINEAR_BASIS:
// not implemented yet
assert(false);
break;
default:
// no endcap
break;
}
}
}
levelPatchTags += level->getNumFaces();
}
}
//
// Populate all adaptive patches now that the tables to hold data for them have been allocated.
// We need the inventory (counts per patch type) and the patch tags per face that were previously
// idenified.
//
void
PatchTableFactory::populateAdaptivePatches(
AdaptiveContext & context, PtexIndices const & ptexIndices) {
TopologyRefiner const & refiner = context.refiner;
PatchTable * table = context.table;
//
// Setup convenience pointers at the beginning of each patch array for each
// table (patches, ptex)
//
PatchCVPointers iptrs;
PatchParamPointers pptrs;
PatchFVarOffsets fofss;
PatchFVarPointers fptrs;
SharpnessIndexPointers sptrs;
ConstPatchDescriptorArray const & descs =
PatchDescriptor::GetAdaptivePatchDescriptors(Sdc::SCHEME_CATMARK);
for (int i=0; i<descs.size(); ++i) {
PatchDescriptor desc = descs[i];
Index arrayIndex = table->findPatchArray(desc);
if (arrayIndex==Vtr::INDEX_INVALID) {
continue;
}
iptrs.getValue(desc) = table->getPatchArrayVertices(arrayIndex).begin();
pptrs.getValue(desc) = table->getPatchParams(arrayIndex).begin();
if (context.options.useSingleCreasePatch) {
sptrs.getValue(desc) = table->getSharpnessIndices(arrayIndex);
}
if (context.RequiresFVarPatches()) {
Index & offsets = fofss.getValue(desc);
offsets = table->getPatchIndex(arrayIndex, 0);
// XXXX manuelk this stuff will go away as we use offsets from FVarPatchChannel
FVarChannelCursor & fvc = context.fvarChannelCursor;
assert(fvc.size() == table->GetNumFVarChannels());
Index ** fptr = (Index **)alloca(fvc.size()*sizeof(Index *));
for (fvc=fvc.begin(); fvc!=fvc.end(); ++fvc) {
Index pidx = table->getPatchIndex(arrayIndex, 0);
int ofs = pidx * 4;
fptr[fvc.pos()] = &table->getFVarValues(fvc.pos())[ofs];
}
fptrs.getValue(desc) = fptr;
}
}
//
// Now iterate through the faces for all levels and populate the patches:
//
int levelFaceOffset = 0,
levelVertOffset = 0;
int * levelFVarVertOffsets = 0;
if (context.RequiresFVarPatches()) {
int nchannels = refiner.GetNumFVarChannels();
levelFVarVertOffsets = (int *)alloca(nchannels*sizeof(int));
memset(levelFVarVertOffsets, 0, nchannels*sizeof(int));
}
// endcap factories
// XXX
EndCapBSplineBasisPatchFactory *endCapBSpline = NULL;
EndCapGregoryBasisPatchFactory *endCapGregoryBasis = NULL;
EndCapLegacyGregoryPatchFactory *endCapLegacyGregory = NULL;
switch(context.options.GetEndCapType()) {
case Options::ENDCAP_GREGORY_BASIS:
endCapGregoryBasis = new EndCapGregoryBasisPatchFactory(
refiner, context.options.shareEndCapPatchPoints);
break;
case Options::ENDCAP_BSPLINE_BASIS:
endCapBSpline = new EndCapBSplineBasisPatchFactory(refiner);
break;
case Options::ENDCAP_LEGACY_GREGORY:
endCapLegacyGregory = new EndCapLegacyGregoryPatchFactory(refiner);
break;
default:
break;
}
for (int i = 0; i < refiner.GetNumLevels(); ++i) {
Vtr::internal::Level const * level = &refiner.getLevel(i);
const PatchFaceTag * levelPatchTags = &context.patchTags[levelFaceOffset];
for (int faceIndex = 0; faceIndex < level->getNumFaces(); ++faceIndex) {
if (level->isFaceHole(faceIndex)) {
continue;
}
const PatchFaceTag& patchTag = levelPatchTags[faceIndex];
if (not patchTag._hasPatch) {
continue;
}
if (patchTag._isRegular) {
Index patchVerts[16];
int bIndex = patchTag._boundaryIndex;
int boundaryMask = patchTag._boundaryMask;
int transitionMask = patchTag._transitionMask;
int const * permutation = 0;
// only single-crease patch has a sharpness.
float sharpness = 0;
if (patchTag._boundaryCount == 0) {
static int const permuteRegular[16] = { 5, 6, 7, 8, 4, 0, 1, 9, 15, 3, 2, 10, 14, 13, 12, 11 };
permutation = permuteRegular;
if (patchTag._isSingleCrease) {
boundaryMask = (1<<bIndex);
sharpness = level->getEdgeSharpness((level->getFaceEdges(faceIndex)[bIndex]));
sharpness = std::min(sharpness, (float)(context.options.maxIsolationLevel-i));
}
level->gatherQuadRegularInteriorPatchPoints(faceIndex, patchVerts, 0 /* no rotation*/);
} else if (patchTag._boundaryCount == 1) {
// Expand boundary patch vertices and rotate to restore correct orientation.
static int const permuteBoundary[4][16] = {
{ -1, -1, -1, -1, 11, 3, 0, 4, 10, 2, 1, 5, 9, 8, 7, 6 },
{ 9, 10, 11, -1, 8, 2, 3, -1, 7, 1, 0, -1, 6, 5, 4, -1 },
{ 6, 7, 8, 9, 5, 1, 2, 10, 4, 0, 3, 11, -1, -1, -1, -1 },
{ -1, 4, 5, 6, -1, 0, 1, 7, -1, 3, 2, 8, -1, 11, 10, 9 } };
permutation = permuteBoundary[bIndex];
level->gatherQuadRegularBoundaryPatchPoints(faceIndex, patchVerts, bIndex);
} else if (patchTag._boundaryCount == 2) {
// Expand corner patch vertices and rotate to restore correct orientation.
static int const permuteCorner[4][16] = {
{ -1, -1, -1, -1, -1, 0, 1, 4, -1, 3, 2, 5, -1, 8, 7, 6 },
{ -1, -1, -1, -1, 8, 3, 0, -1, 7, 2, 1, -1, 6, 5, 4, -1 },
{ 6, 7, 8, -1, 5, 2, 3, -1, 4, 1, 0, -1, -1, -1, -1, -1 },
{ -1, 4, 5, 6, -1, 1, 2, 7, -1, 0, 3, 8, -1, -1, -1, -1 } };
permutation = permuteCorner[bIndex];
level->gatherQuadRegularCornerPatchPoints(faceIndex, patchVerts, bIndex);
} else {
assert(patchTag._boundaryCount <= 2);
}
offsetAndPermuteIndices(patchVerts, 16, levelVertOffset, permutation, iptrs.R);
iptrs.R += 16;
pptrs.R = computePatchParam(refiner, ptexIndices, i, faceIndex, boundaryMask, transitionMask, pptrs.R);
// XXX: sharpness will be integrated into patch param soon.
if (sptrs.R) *sptrs.R++ = assignSharpnessIndex(sharpness, table->_sharpnessValues);
fofss.R += gatherFVarData(context,
i, faceIndex, levelFaceOffset, /*rotation*/0, levelFVarVertOffsets, fofss.R, fptrs.R);
} else {
// emit end patch. end patch should be in the max level (until we implement DFAS)
assert(i==refiner.GetMaxLevel());
// switch endcap patchtype by option
switch(context.options.GetEndCapType()) {
case Options::ENDCAP_GREGORY_BASIS:
{
// note: this call will be moved into vtr::level.
ConstIndexArray cvs = endCapGregoryBasis->GetPatchPoints(
level, faceIndex, levelPatchTags, levelVertOffset);
for (int j = 0; j < cvs.size(); ++j) iptrs.GP[j] = cvs[j];
iptrs.GP += cvs.size();
pptrs.GP = computePatchParam(
refiner, ptexIndices, i, faceIndex, /*boundary*/0, /*transition*/0, pptrs.GP);
if (sptrs.R) *sptrs.R++ = assignSharpnessIndex(0, table->_sharpnessValues);
fofss.GP += gatherFVarData(context,
i, faceIndex, levelFaceOffset,
0, levelFVarVertOffsets, fofss.GP, fptrs.GP);
break;
}
case Options::ENDCAP_BSPLINE_BASIS:
{
ConstIndexArray cvs = endCapBSpline->GetPatchPoints(
level, faceIndex, levelPatchTags, levelVertOffset);
for (int j = 0; j < cvs.size(); ++j) iptrs.R[j] = cvs[j];
iptrs.R += cvs.size();
pptrs.R = computePatchParam(
refiner, ptexIndices, i, faceIndex, /*boundary*/0, /*transition*/0, pptrs.R);
if (sptrs.R) *sptrs.R++ = assignSharpnessIndex(0, table->_sharpnessValues);
fofss.R += gatherFVarData(context,
i, faceIndex, levelFaceOffset,
0, levelFVarVertOffsets, fofss.R, fptrs.R);
break;
}
case Options::ENDCAP_LEGACY_GREGORY:
{
ConstIndexArray cvs = endCapLegacyGregory->GetPatchPoints(
level, faceIndex, levelPatchTags, levelVertOffset);
if (patchTag._boundaryCount == 0) {
for (int j = 0; j < cvs.size(); ++j) iptrs.G[j] = cvs[j];
iptrs.G += cvs.size();
pptrs.G = computePatchParam(
refiner, ptexIndices, i, faceIndex, /*boundary*/0, /*transition*/0, pptrs.G);
if (sptrs.R) *sptrs.R++ = assignSharpnessIndex(0, table->_sharpnessValues);
fofss.G += gatherFVarData(context,
i, faceIndex, levelFaceOffset,
0, levelFVarVertOffsets, fofss.G, fptrs.G);
} else {
for (int j = 0; j < cvs.size(); ++j) iptrs.GB[j] = cvs[j];
iptrs.GB += cvs.size();
pptrs.GB = computePatchParam(
refiner, ptexIndices, i, faceIndex, /*boundary*/0, /*transition*/0, pptrs.GB);
if (sptrs.R) *sptrs.R++ = assignSharpnessIndex(0, table->_sharpnessValues);
fofss.GB += gatherFVarData(context,
i, faceIndex, levelFaceOffset,
0, levelFVarVertOffsets, fofss.GB, fptrs.GB);
}
break;
}
case Options::ENDCAP_BILINEAR_BASIS:
// not implemented yet
assert(false);
break;
default:
// no endcap
break;
}
}
}
levelFaceOffset += level->getNumFaces();
levelVertOffset += level->getNumVertices();
if (context.RequiresFVarPatches()) {
int nchannels = refiner.GetNumFVarChannels();
for (int channel=0; channel<nchannels; ++channel) {
levelFVarVertOffsets[channel] += level->getNumFVarValues(channel);
}
}
}
// finalize end patches
switch(context.options.GetEndCapType()) {
case Options::ENDCAP_GREGORY_BASIS:
table->_localPointStencils =
endCapGregoryBasis->CreateVertexStencilTable();
table->_localPointVaryingStencils =
endCapGregoryBasis->CreateVaryingStencilTable();
delete endCapGregoryBasis;
break;
case Options::ENDCAP_BSPLINE_BASIS:
table->_localPointStencils =
endCapBSpline->CreateVertexStencilTable();
table->_localPointVaryingStencils =
endCapBSpline->CreateVaryingStencilTable();
delete endCapBSpline;
break;
case Options::ENDCAP_LEGACY_GREGORY:
endCapLegacyGregory->Finalize(
table->GetMaxValence(),
&table->_quadOffsetsTable,
&table->_vertexValenceTable);
delete endCapLegacyGregory;
break;
default:
break;
}
}
} // end namespace Far
} // end namespace OPENSUBDIV_VERSION
} // end namespace OpenSubdiv
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