mirror of
https://github.com/PixarAnimationStudios/OpenSubdiv
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241 lines
7.9 KiB
C++
241 lines
7.9 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 OPENSUBDIV3_FAR_PATCH_MAP_H
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#define OPENSUBDIV3_FAR_PATCH_MAP_H
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#include "../version.h"
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#include "../far/patchTable.h"
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#include <cassert>
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namespace OpenSubdiv {
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namespace OPENSUBDIV_VERSION {
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namespace Far {
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/// \brief An quadtree-based map connecting coarse faces to their sub-patches
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///
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/// PatchTable::PatchArrays contain lists of patches that represent the limit
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/// surface of a mesh, sorted by their topological type. These arrays break the
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/// connection between coarse faces and their sub-patches.
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///
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/// The PatchMap provides a quad-tree based lookup structure that, given a singular
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/// parametric location, can efficiently return a handle to the sub-patch that
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/// contains this location.
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///
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class PatchMap {
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public:
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typedef PatchTable::PatchHandle Handle;
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/// \brief Constructor
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///
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/// @param patchTable A valid PatchTable
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///
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PatchMap( PatchTable const & patchTable );
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/// \brief Returns a handle to the sub-patch of the face at the given (u,v).
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/// Note that the patch face ID corresponds to potentially quadrangulated
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/// face indices and not the base face indices (see Far::PtexIndices for more
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/// details).
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///
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/// @param patchFaceId The index of the face
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///
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/// @param u Local u parameter
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///
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/// @param v Local v parameter
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///
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/// @return A patch handle or 0 if the face is not supported (index
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/// out of bounds) or is tagged as a hole
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///
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Handle const * FindPatch( int patchFaceId, double u, double v ) const;
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private:
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void initializeHandles(PatchTable const & patchTable);
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void initializeQuadtree(PatchTable const & patchTable);
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private:
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// Quadtree node with 4 children, tree is just a vector of nodes
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struct QuadNode {
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QuadNode() { std::memset(this, 0, sizeof(QuadNode)); }
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struct Child {
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unsigned int isSet : 1; // true if the child has been set
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unsigned int isLeaf : 1; // true if the child is a QuadNode
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unsigned int index : 30; // child index (either QuadNode or Handle)
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};
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// sets all the children to point to the patch of given index
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void SetChildren(int index);
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// sets the child in "quadrant" to point to the node or patch of the given index
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void SetChild(int quadrant, int index, bool isLeaf);
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Child children[4];
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};
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typedef std::vector<QuadNode> QuadTree;
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// Internal methods supporting quadtree construction and queries
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void assignRootNode(QuadNode * node, int index);
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QuadNode * assignLeafOrChildNode(QuadNode * node, bool isLeaf, int quad, int index);
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template <class T>
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static int transformUVToQuadQuadrant(T const & median, T & u, T & v);
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template <class T>
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static int transformUVToTriQuadrant(T const & median, T & u, T & v, bool & rotated);
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private:
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bool _patchesAreTriangular; // tri and quad assembly and search requirements differ
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int _minPatchFace; // minimum patch face index supported by the map
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int _maxPatchFace; // maximum patch face index supported by the map
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int _maxDepth; // maximum depth of a patch in the tree
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std::vector<Handle> _handles; // all the patches in the PatchTable
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std::vector<QuadNode> _quadtree; // quadtree nodes
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};
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//
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// Given a median value for both U and V, these methods transform a (u,v) pair
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// into the quadrant that contains them and returns the quadrant index.
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//
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// Quadrant indexing for tri and quad patches -- consistent with PatchParam's
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// usage of UV bits:
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//
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// (0,1) o-----o-----o (1,1) (0,1) o (1,0) o-----o-----o (0,0)
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// | | | |\ \ 1 |\ 0 |
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// | 2 | 3 | | \ \ | \ |
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// | | | | 2 \ \| 3 \|
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// o-----o-----o o-----o o-----o
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// | | | |\ 3 |\ \ 2 |
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// | 0 | 1 | | \ | \ \ |
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// | | | | 0 \| 1 \ \|
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// (0,0) o-----o-----o (1,0) (0,0) o-----o-----o (1,0) o (0,1)
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//
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// The triangular case also takes and returns/affects the rotation of the
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// quadrant being searched and identified (quadrant 3 imparts a rotation).
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//
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template <class T>
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inline int
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PatchMap::transformUVToQuadQuadrant(T const & median, T & u, T & v) {
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int uHalf = (u >= median);
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if (uHalf) u -= median;
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int vHalf = (v >= median);
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if (vHalf) v -= median;
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return (vHalf << 1) | uHalf;
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}
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template <class T>
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int inline
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PatchMap::transformUVToTriQuadrant(T const & median, T & u, T & v, bool & rotated) {
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if (!rotated) {
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if (u >= median) {
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u -= median;
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return 1;
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}
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if (v >= median) {
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v -= median;
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return 2;
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}
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if ((u + v) >= median) {
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rotated = true;
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return 3;
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}
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return 0;
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} else {
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if (u < median) {
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v -= median;
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return 1;
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}
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if (v < median) {
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u -= median;
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return 2;
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}
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u -= median;
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v -= median;
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if ((u + v) < median) {
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rotated = false;
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return 3;
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}
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return 0;
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}
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}
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/// Returns a handle to the sub-patch of the face at the given (u,v).
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inline PatchMap::Handle const *
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PatchMap::FindPatch( int faceid, double u, double v ) const {
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//
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// Reject patch faces not supported by this map, or those corresponding
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// to holes or otherwise unassigned (the root node for a patch will
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// have all or no quadrants set):
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//
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if ((faceid < _minPatchFace) || (faceid > _maxPatchFace)) return 0;
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QuadNode const * node = &_quadtree[faceid - _minPatchFace];
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if (!node->children[0].isSet) return 0;
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//
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// Search the tree for the sub-patch containing the given (u,v)
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//
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assert( (u>=0.0) && (u<=1.0) && (v>=0.0) && (v<=1.0) );
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double median = 0.5;
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bool triRotated = false;
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for (int depth = 0; depth <= _maxDepth; ++depth, median *= 0.5) {
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int quadrant = _patchesAreTriangular
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? transformUVToTriQuadrant(median, u, v, triRotated)
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: transformUVToQuadQuadrant(median, u, v);
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// holes should have been rejected at the root node of the face
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assert(node->children[quadrant].isSet);
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if (node->children[quadrant].isLeaf) {
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return &_handles[node->children[quadrant].index];
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} else {
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node = &_quadtree[node->children[quadrant].index];
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}
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}
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assert(0);
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return 0;
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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 /* OPENSUBDIV3_FAR_PATCH_PARAM */
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