mirror of
https://github.com/PixarAnimationStudios/OpenSubdiv
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140 lines
4.1 KiB
C++
140 lines
4.1 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 "Apache License")
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// with the following modification; you may not use this file except in
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// compliance with the Apache License and the following modification to it:
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// Section 6. Trademarks. is deleted and replaced with:
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//
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// 6. Trademarks. This License does not grant permission to use the trade
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// names, trademarks, service marks, or product names of the Licensor
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// and its affiliates, except as required to comply with Section 4(c) of
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// the License and to reproduce the content of the NOTICE file.
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//
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// You may obtain a copy of the Apache 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, software
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// distributed under the Apache License with the above modification is
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// distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the Apache License for the specific
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// language governing permissions and limitations under the Apache License.
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//
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#ifndef FAR_GREGORY_BASIS_H
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#define FAR_GREGORY_BASIS_H
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#include "../far/protoStencil.h"
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namespace OpenSubdiv {
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namespace OPENSUBDIV_VERSION {
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namespace Far {
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class TopologyRefiner;
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/// \brief Container for gregory basis stencils
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///
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class GregoryBasis {
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public:
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/// \brief Updates point values based on the control values
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///
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/// \note The destination buffers are assumed to have allocated at least
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/// \c GetNumStencils() elements.
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///
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/// @param controlValues Buffer with primvar data for the control vertices
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///
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/// @param values Destination buffer for the interpolated primvar
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/// data
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///
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template <class T, class U>
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void Evaluate(T const & controlValues, U values[20]) const {
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Index const * indices = &_indices.at(0);
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float const * weights = &_weights.at(0);
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for (int i=0; i<20; ++i) {
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values[i].Clear();
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for (int j=0; j<_sizes[i]; ++j, ++indices, ++weights) {
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values[i].AddWithWeight(controlValues[*indices], *weights);
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}
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}
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}
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private:
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friend class GregoryBasisFactory;
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int _sizes[20],
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_offsets[20];
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std::vector<Index> _indices;
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std::vector<float> _weights;
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};
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/// \brief A specialized factory to gather Gregory basis control vertices
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///
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class GregoryBasisFactory {
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public:
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//
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// Single patch GregoryBasis basis factory
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//
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/// \brief Instantiates a GregoryBasis from a TopologyRefiner that has been
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/// refined adaptively for a given face.
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///
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/// @param refiner The TopologyRefiner containing the topology
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///
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/// @param faceIndex The index of the face (level is assumed to be MaxLevel)
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///
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static GregoryBasis const * Create(TopologyRefiner const & refiner, Index faceIndex);
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/// \brief Returns the maximum valence of a vertex in the mesh that the
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/// Gregory patches can handle
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static int GetMaxValence();
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public:
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//
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// Multi-patch Gregory stencils factory
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//
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// This factory accumulates Gregory patch basis into StencilTables
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//
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// Note: the TopologyRefiner and StencilTables references are held for the
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// lifespan of the factory - neither can be deleted or modified while
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// this factory is active.
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//
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GregoryBasisFactory(TopologyRefiner const & refiner,
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StencilTables const & stencils, int numpatches, int maxvalence);
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// Creates a basis for the face and adds it to the stencil pool allocator
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bool AddPatchBasis(Index faceIndex);
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// After all the patches have been collected, create the final table
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StencilTables const * CreateStencilTables(int const permute[20]=0);
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private:
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int _currentStencil;
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TopologyRefiner const & _refiner; // XXXX these should be smart pointers !
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Index _stencilsOffset;
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StencilTables const & _stencils;
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StencilAllocator _alloc;
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};
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} // end namespace Far
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} // end namespace OPENSUBDIV_VERSION
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} // end namespace OpenSubdiv
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#endif /* FAR_GREGORY_BASIS_H */
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