mirror of
https://github.com/PixarAnimationStudios/OpenSubdiv
synced 2024-11-25 04:50:06 +00:00
9bb98a94fd
- renamed Sdc::Type to SchemeType and TypeTraits to SchemeTypeTraits
- renamed TYPE_ prefix to SCHEME_
- updated all usage within core library
- updated all usage in examples, tutorials, etc.
239 lines
7.7 KiB
C++
239 lines
7.7 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_PATCH_DESCRIPTOR_H
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#define FAR_PATCH_DESCRIPTOR_H
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#include "../version.h"
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#include "../sdc/types.h"
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#include <vector>
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namespace OpenSubdiv {
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namespace OPENSUBDIV_VERSION {
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namespace Far {
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/// \brief Describes the type of a patch
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///
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/// Uniquely identifies all the different types of patches
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///
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/// * Uniformly subdivided meshes contain bilinear patches of either QUADS
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/// or TRIANGLES
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///
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/// * Adaptively subdivided meshes contain bicubic patches of types REGULAR,
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/// BOUNDARY, SINGLE_CREASE, CORNER, GREGORY, GREGORY_BOUNDARY, GREGOYR_BASIS.
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/// These bicubic patches are also further distinguished by a transition
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/// pattern as well as a rotational orientation.
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///
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/// Bitfield layout :
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///
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/// Field | Bits | Content
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/// -----------|:----:|------------------------------------------------------
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/// _type | 4 | patch type
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/// _pattern | 3 | patch transition pattern
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/// _rotation | 2 | patch rotation
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///
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class PatchDescriptor {
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public:
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enum Type {
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NON_PATCH = 0, ///< undefined
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POINTS, ///< points (useful for cage drawing)
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LINES, ///< lines (useful for cage drawing)
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QUADS, ///< bilinear quads-only patches
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TRIANGLES, ///< bilinear triangles-only mesh
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LOOP, ///< Loop patch
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REGULAR, ///< feature-adaptive bicubic patches
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SINGLE_CREASE,
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BOUNDARY,
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CORNER,
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GREGORY,
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GREGORY_BOUNDARY,
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GREGORY_BASIS
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};
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enum TransitionPattern {
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NON_TRANSITION = 0,
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PATTERN0,
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PATTERN1,
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PATTERN2,
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PATTERN3,
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PATTERN4
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};
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public:
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/// \brief Default constructor.
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PatchDescriptor() :
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_type(NON_PATCH), _pattern(NON_TRANSITION), _rotation(0) {}
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/// \brief Constructor
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PatchDescriptor(int type, int pattern, unsigned char rotation) :
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_type(type), _pattern(pattern), _rotation(rotation) { }
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/// \brief Copy Constructor
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PatchDescriptor( PatchDescriptor const & d ) :
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_type(d.GetType()), _pattern(d.GetPattern()), _rotation(d.GetRotation()) { }
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/// \brief Returns the type of the patch
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Type GetType() const {
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return (Type)_type;
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}
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/// \brief Returns the transition pattern of the patch if any (5 types)
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TransitionPattern GetPattern() const {
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return (TransitionPattern)_pattern;
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}
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/// \brief Returns the rotation of the patch (4 rotations)
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unsigned char GetRotation() const {
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return (unsigned char)_rotation;
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}
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/// \brief Returns the number of control vertices expected for a patch of the
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/// type described
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static inline short GetNumControlVertices( Type t );
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static inline short GetNumFVarControlVertices( Type t );
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/// \brief Returns the number of control vertices expected for a patch of the
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/// type described
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short GetNumControlVertices() const {
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return GetNumControlVertices( this->GetType() );
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}
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/// \brief Returns the number of control vertices expected for a patch of the
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/// type described
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short GetNumFVarControlVertices() const {
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return GetNumFVarControlVertices( this->GetType() );
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}
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/// \brief Number of control vertices of Regular Patches in table.
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static short GetRegularPatchSize() { return 16; }
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/// \brief Number of control vertices of Boundary Patches in table.
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static short GetBoundaryPatchSize() { return 12; }
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/// \brief Number of control vertices of Boundary Patches in table.
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static short GetCornerPatchSize() { return 9; }
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/// \brief Number of control vertices of Gregory (and Gregory Boundary) Patches in table.
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static short GetGregoryPatchSize() { return 4; }
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/// \brief Number of control vertices of Gregory patch basis (20)
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static short GetGregoryBasisPatchSize() { return 20; }
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/// \brief Returns a vector of all the legal patch descriptors for the
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/// given adaptive subdivision scheme
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static std::vector<PatchDescriptor> const & GetAdaptivePatchDescriptors(Sdc::SchemeType type);
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/// \brief Allows ordering of patches by type
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inline bool operator < ( PatchDescriptor const other ) const;
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/// \brief True if the descriptors are identical
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inline bool operator == ( PatchDescriptor const other ) const;
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private:
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friend class PatchTablesFactory;
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unsigned int _type:4;
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unsigned int _pattern:3;
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unsigned int _rotation:2;
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};
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typedef std::vector<PatchDescriptor> PatchDescriptorVector;
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// Returns the number of control vertices expected for a patch of this type
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inline short
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PatchDescriptor::GetNumControlVertices( Type type ) {
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switch (type) {
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case REGULAR : return GetRegularPatchSize();
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case SINGLE_CREASE : return GetRegularPatchSize();
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case QUADS : return 4;
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case GREGORY :
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case GREGORY_BOUNDARY : return GetGregoryPatchSize();
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case GREGORY_BASIS : return GetGregoryBasisPatchSize();
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case BOUNDARY : return GetBoundaryPatchSize();
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case CORNER : return GetCornerPatchSize();
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case TRIANGLES : return 3;
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case LINES : return 2;
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case POINTS : return 1;
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default : return -1;
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}
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}
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// Returns the number of face-varying control vertices expected for a patch of this type
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inline short
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PatchDescriptor::GetNumFVarControlVertices( Type type ) {
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switch (type) {
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case REGULAR : // We only support bilinear interpolation for now,
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case SINGLE_CREASE :
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case QUADS : // so all these patches only carry 4 CVs.
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case GREGORY :
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case GREGORY_BOUNDARY :
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case GREGORY_BASIS :
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case BOUNDARY :
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case CORNER : return 4;
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case TRIANGLES : return 3;
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case LINES : return 2;
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case POINTS : return 1;
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default : return -1;
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}
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}
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// Allows ordering of patches by type
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inline bool
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PatchDescriptor::operator < ( PatchDescriptor const other ) const {
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return _pattern < other._pattern or ((_pattern == other._pattern) and
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(_type < other._type or ((_type == other._type) and
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(_rotation < other._rotation))));
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}
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// True if the descriptors are identical
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inline bool
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PatchDescriptor::operator == ( PatchDescriptor const other ) const {
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return _pattern == other._pattern and
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_type == other._type and
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_rotation == other._rotation;
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}
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} // end namespace Far
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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_PATCH_DESCRIPTOR_H */
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