mirror of
https://github.com/PixarAnimationStudios/OpenSubdiv
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233 lines
8.2 KiB
C++
233 lines
8.2 KiB
C++
//
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// Copyright 2013 Pixar
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License
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// and the following modification to it: Section 6 Trademarks.
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// deleted and replaced with:
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//
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// 6. Trademarks. This License does not grant permission to use the
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// trade names, trademarks, service marks, or product names of the
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// Licensor and its affiliates, except as required for reproducing
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// the content of the NOTICE file.
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//
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
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// either express or implied. See the License for the specific
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// language governing permissions and limitations under the
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// License.
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//
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#ifndef FAR_CATMARK_SUBDIVISION_TABLES_H
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#define FAR_CATMARK_SUBDIVISION_TABLES_H
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#include "../version.h"
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#include "../far/subdivisionTables.h"
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#include <cassert>
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#include <vector>
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namespace OpenSubdiv {
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namespace OPENSUBDIV_VERSION {
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/// \brief Catmark subdivision scheme tables.
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///
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/// Catmull-Clark tables store the indexing tables required in order to compute
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/// the refined positions of a mesh without the help of a hierarchical data
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/// structure. The advantage of this representation is its ability to be executed
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/// in a massively parallel environment without data dependencies.
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///
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template <class U> class FarCatmarkSubdivisionTables : public FarSubdivisionTables<U> {
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public:
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/// \brief Returns the number of indexing tables needed to represent this
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/// particular subdivision scheme.
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virtual int GetNumTables() const { return 7; }
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private:
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template <class X, class Y> friend class FarCatmarkSubdivisionTablesFactory;
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template <class X, class Y> friend class FarMultiMeshFactory;
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template <class CONTROLLER> friend class FarComputeController;
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// Private constructor called by factory
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FarCatmarkSubdivisionTables( FarMesh<U> * mesh, int maxlevel );
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// Compute-kernel applied to vertices resulting from the refinement of a face.
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void computeFacePoints(int offset, int level, int start, int end, void * clientdata) const;
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// Compute-kernel applied to vertices resulting from the refinement of an edge.
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void computeEdgePoints(int offset, int level, int start, int end, void * clientdata) const;
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// Compute-kernel applied to vertices resulting from the refinement of a vertex
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// Kernel "A" Handles the k_Smooth and k_Dart rules
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void computeVertexPointsA(int offset, bool pass, int level, int start, int end, void * clientdata) const;
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// Compute-kernel applied to vertices resulting from the refinement of a vertex
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// Kernel "B" Handles the k_Crease and k_Corner rules
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void computeVertexPointsB(int offset, int level, int start, int end, void * clientdata) const;
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};
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template <class U>
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FarCatmarkSubdivisionTables<U>::FarCatmarkSubdivisionTables( FarMesh<U> * mesh, int maxlevel ) :
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FarSubdivisionTables<U>(mesh, maxlevel)
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{ }
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//
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// Face-vertices compute Kernel - completely re-entrant
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//
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template <class U> void
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FarCatmarkSubdivisionTables<U>::computeFacePoints( int offset, int tableOffset, int start, int end, void * clientdata ) const {
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assert(this->_mesh);
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U * vsrc = &this->_mesh->GetVertices().at(0),
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* vdst = vsrc + offset + start;
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for (int i=start+tableOffset; i<end+tableOffset; ++i, ++vdst ) {
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vdst->Clear(clientdata);
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int h = this->_F_ITa[2*i ],
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n = this->_F_ITa[2*i+1];
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float weight = 1.0f/n;
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for (int j=0; j<n; ++j) {
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vdst->AddWithWeight( vsrc[ this->_F_IT[h+j] ], weight, clientdata );
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vdst->AddVaryingWithWeight( vsrc[ this->_F_IT[h+j] ], weight, clientdata );
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}
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}
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}
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//
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// Edge-vertices compute Kernel - completely re-entrant
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//
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template <class U> void
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FarCatmarkSubdivisionTables<U>::computeEdgePoints( int offset, int tableOffset, int start, int end, void * clientdata ) const {
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assert(this->_mesh);
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U * vsrc = &this->_mesh->GetVertices().at(0),
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* vdst = vsrc + offset + start;
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for (int i=start+tableOffset; i<end+tableOffset; ++i, ++vdst ) {
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vdst->Clear(clientdata);
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int eidx0 = this->_E_IT[4*i+0],
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eidx1 = this->_E_IT[4*i+1],
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eidx2 = this->_E_IT[4*i+2],
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eidx3 = this->_E_IT[4*i+3];
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float vertWeight = this->_E_W[i*2+0];
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// Fully sharp edge : vertWeight = 0.5f
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vdst->AddWithWeight( vsrc[eidx0], vertWeight, clientdata );
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vdst->AddWithWeight( vsrc[eidx1], vertWeight, clientdata );
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if (eidx2!=-1) {
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// Apply fractional sharpness
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float faceWeight = this->_E_W[i*2+1];
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vdst->AddWithWeight( vsrc[eidx2], faceWeight, clientdata );
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vdst->AddWithWeight( vsrc[eidx3], faceWeight, clientdata );
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}
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vdst->AddVaryingWithWeight( vsrc[eidx0], 0.5f, clientdata );
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vdst->AddVaryingWithWeight( vsrc[eidx1], 0.5f, clientdata );
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}
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}
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//
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// Vertex-vertices compute Kernels "A" and "B" - completely re-entrant
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//
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// multi-pass kernel handling k_Crease and k_Corner rules
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template <class U> void
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FarCatmarkSubdivisionTables<U>::computeVertexPointsA( int offset, bool pass, int tableOffset, int start, int end, void * clientdata ) const {
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assert(this->_mesh);
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U * vsrc = &this->_mesh->GetVertices().at(0),
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* vdst = vsrc + offset + start;
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for (int i=start+tableOffset; i<end+tableOffset; ++i, ++vdst ) {
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if (not pass)
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vdst->Clear(clientdata);
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int n=this->_V_ITa[5*i+1], // number of vertices in the _VO_IT array (valence)
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p=this->_V_ITa[5*i+2], // index of the parent vertex
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eidx0=this->_V_ITa[5*i+3], // index of the first crease rule edge
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eidx1=this->_V_ITa[5*i+4]; // index of the second crease rule edge
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float weight = pass ? this->_V_W[i] : 1.0f - this->_V_W[i];
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// In the case of fractional weight, the weight must be inverted since
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// the value is shared with the k_Smooth kernel (statistically the
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// k_Smooth kernel runs much more often than this one)
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if (weight>0.0f and weight<1.0f and n>0)
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weight=1.0f-weight;
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// In the case of a k_Corner / k_Crease combination, the edge indices
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// won't be null, so we use a -1 valence to detect that particular case
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if (eidx0==-1 or (pass==false and (n==-1)) ) {
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// k_Corner case
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vdst->AddWithWeight( vsrc[p], weight, clientdata );
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} else {
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// k_Crease case
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vdst->AddWithWeight( vsrc[p], weight * 0.75f, clientdata );
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vdst->AddWithWeight( vsrc[eidx0], weight * 0.125f, clientdata );
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vdst->AddWithWeight( vsrc[eidx1], weight * 0.125f, clientdata );
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}
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vdst->AddVaryingWithWeight( vsrc[p], 1.0f, clientdata );
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}
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}
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// multi-pass kernel handling k_Dart and k_Smooth rules
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template <class U> void
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FarCatmarkSubdivisionTables<U>::computeVertexPointsB( int offset, int tableOffset, int start, int end, void * clientdata ) const {
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assert(this->_mesh);
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U * vsrc = &this->_mesh->GetVertices().at(0),
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* vdst = vsrc + offset + start;
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for (int i=start+tableOffset; i<end+tableOffset; ++i, ++vdst ) {
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vdst->Clear(clientdata);
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int h = this->_V_ITa[5*i ], // offset of the vertices in the _V0_IT array
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n = this->_V_ITa[5*i+1], // number of vertices in the _VO_IT array (valence)
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p = this->_V_ITa[5*i+2]; // index of the parent vertex
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float weight = this->_V_W[i],
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wp = 1.0f/(n*n),
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wv = (n-2.0f)*n*wp;
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vdst->AddWithWeight( vsrc[p], weight * wv, clientdata );
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for (int j=0; j<n; ++j) {
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vdst->AddWithWeight( vsrc[this->_V_IT[h+j*2 ]], weight * wp, clientdata );
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vdst->AddWithWeight( vsrc[this->_V_IT[h+j*2+1]], weight * wp, clientdata );
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}
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vdst->AddVaryingWithWeight( vsrc[p], 1.0f, clientdata );
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}
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}
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} // end namespace OPENSUBDIV_VERSION
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using namespace OPENSUBDIV_VERSION;
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} // end namespace OpenSubdiv
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#endif /* FAR_CATMARK_SUBDIVISION_TABLES_H */
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