mirror of
https://github.com/PixarAnimationStudios/OpenSubdiv
synced 2025-01-08 07:40:17 +00:00
10c687ecd5
- [Feature Adaptive GPU Rendering of Catmull-Clark Surfaces](http://research.microsoft.com/en-us/um/people/cloop/tog2012.pdf). - New API architecture : we are planning to lock on to this new framework as the basis for backward compatibility, which we will enforce from Release 1.0 onward. Subsequent releases of OpenSubdiv should not break client code. - DirectX 11 support - and much more...
674 lines
22 KiB
C++
674 lines
22 KiB
C++
//
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// Copyright (C) Pixar. All rights reserved.
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//
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// This license governs use of the accompanying software. If you
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// use the software, you accept this license. If you do not accept
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// the license, do not use the software.
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//
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// 1. Definitions
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// The terms "reproduce," "reproduction," "derivative works," and
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// "distribution" have the same meaning here as under U.S.
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// copyright law. A "contribution" is the original software, or
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// any additions or changes to the software.
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// A "contributor" is any person or entity that distributes its
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// contribution under this license.
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// "Licensed patents" are a contributor's patent claims that read
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// directly on its contribution.
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//
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// 2. Grant of Rights
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// (A) Copyright Grant- Subject to the terms of this license,
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// including the license conditions and limitations in section 3,
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// each contributor grants you a non-exclusive, worldwide,
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// royalty-free copyright license to reproduce its contribution,
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// prepare derivative works of its contribution, and distribute
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// its contribution or any derivative works that you create.
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// (B) Patent Grant- Subject to the terms of this license,
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// including the license conditions and limitations in section 3,
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// each contributor grants you a non-exclusive, worldwide,
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// royalty-free license under its licensed patents to make, have
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// made, use, sell, offer for sale, import, and/or otherwise
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// dispose of its contribution in the software or derivative works
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// of the contribution in the software.
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//
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// 3. Conditions and Limitations
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// (A) No Trademark License- This license does not grant you
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// rights to use any contributor's name, logo, or trademarks.
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// (B) If you bring a patent claim against any contributor over
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// patents that you claim are infringed by the software, your
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// patent license from such contributor to the software ends
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// automatically.
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// (C) If you distribute any portion of the software, you must
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// retain all copyright, patent, trademark, and attribution
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// notices that are present in the software.
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// (D) If you distribute any portion of the software in source
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// code form, you may do so only under this license by including a
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// complete copy of this license with your distribution. If you
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// distribute any portion of the software in compiled or object
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// code form, you may only do so under a license that complies
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// with this license.
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// (E) The software is licensed "as-is." You bear the risk of
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// using it. The contributors give no express warranties,
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// guarantees or conditions. You may have additional consumer
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// rights under your local laws which this license cannot change.
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// To the extent permitted under your local laws, the contributors
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// exclude the implied warranties of merchantability, fitness for
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// a particular purpose and non-infringement.
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//
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#ifndef HBRHALFEDGE_H
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#define HBRHALFEDGE_H
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#include <assert.h>
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#include <cstring>
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#include <iostream>
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#ifdef HBRSTITCH
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#include "libgprims/stitch.h"
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#include "libgprims/stitchInternal.h"
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#endif
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#include "../version.h"
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namespace OpenSubdiv {
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namespace OPENSUBDIV_VERSION {
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template <class T> class HbrFace;
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template <class T> class HbrHalfedge;
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template <class T> class HbrVertex;
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template <class T> class HbrMesh;
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template <class T> std::ostream& operator<<(std::ostream& out, const HbrHalfedge<T>& edge);
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template <class T> class HbrHalfedge {
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public:
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HbrHalfedge(): opposite(0), incidentFace(0), incidentVertex(0), vchild(0), sharpness(0.0f)
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#ifdef HBRSTITCH
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, stitchccw(1), raystitchccw(1)
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#endif
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, coarse(1)
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{
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}
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~HbrHalfedge();
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void Clear();
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// Finish the initialization of the halfedge. Should only be
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// called by HbrFace
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void Initialize(HbrHalfedge<T>* opposite, int index, HbrVertex<T>* origin, unsigned int *fvarbits, HbrFace<T>* face);
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// Returns the opposite half edge
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HbrHalfedge<T>* GetOpposite() const { return opposite; }
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// Sets the opposite half edge
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void SetOpposite(HbrHalfedge<T>* opposite) { this->opposite = opposite; sharpness = opposite->sharpness; }
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// Returns the next clockwise halfedge around the incident face
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HbrHalfedge<T>* GetNext() const {
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if (lastedge) {
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return (HbrHalfedge<T>*) ((char*) this - (incidentFace->GetNumVertices() - 1) * sizeof(HbrHalfedge<T>));
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} else {
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return (HbrHalfedge<T>*) ((char*) this + sizeof(HbrHalfedge<T>));
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}
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}
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// Returns the previous counterclockwise halfedge around the incident face
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HbrHalfedge<T>* GetPrev() const {
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if (firstedge) {
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return (HbrHalfedge<T>*) ((char*) this + (incidentFace->GetNumVertices() - 1) * sizeof(HbrHalfedge<T>));
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} else {
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return (HbrHalfedge<T>*) ((char*) this - sizeof(HbrHalfedge<T>));
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}
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}
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// Returns the index of the edge relative to its incident face.
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// This relies on knowledge of the face's edge allocation pattern
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int GetIndex() const {
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// we allocate room for up to 4 values (to handle tri or quad)
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// in the edges array. If there are more than that, they _all_
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// go in the extra edges array.
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if (this >= incidentFace->edges &&
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this < incidentFace->edges + 4) {
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return int(this - incidentFace->edges);
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} else {
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return int(this - incidentFace->extraedges);
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}
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}
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// Returns the incident vertex
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HbrVertex<T>* GetVertex() const {
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return incidentVertex;
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}
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// Returns the source vertex
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HbrVertex<T>* GetOrgVertex() const {
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return incidentVertex;
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}
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// Changes the origin vertex. Generally not a good idea to do
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void SetOrgVertex(HbrVertex<T>* v) { incidentVertex = v; }
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// Returns the destination vertex
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HbrVertex<T>* GetDestVertex() const { return GetNext()->GetOrgVertex(); }
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// Returns the incident facet
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HbrFace<T>* GetFace() const { return incidentFace; }
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// Returns the mesh to which this edge belongs
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HbrMesh<T>* GetMesh() const { return incidentFace->GetMesh(); }
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// Returns the face on the right
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HbrFace<T>* GetRightFace() const { return opposite ? opposite->GetLeftFace() : NULL; }
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// Return the face on the left of the halfedge
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HbrFace<T>* GetLeftFace() const { return incidentFace; }
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// Returns whether this is a boundary edge
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bool IsBoundary() const { return opposite == 0; }
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// Tag the edge as being an infinitely sharp facevarying edge
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void SetFVarInfiniteSharp(int datum, bool infsharp) {
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int intindex = datum >> 4;
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unsigned int bits = infsharp << ((datum & 15) * 2);
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getFVarInfSharp()[intindex] |= bits;
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if (opposite) {
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opposite->getFVarInfSharp()[intindex] |= bits;
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}
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}
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// Copy fvar infinite sharpness flags from another edge
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void CopyFVarInfiniteSharpness(HbrHalfedge<T>* edge) {
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unsigned int *fvarinfsharp = getFVarInfSharp();
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if (fvarinfsharp) {
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const int fvarcount = GetMesh()->GetFVarCount();
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int fvarbitsSizePerEdge = ((fvarcount + 15) / 16);
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memcpy(fvarinfsharp, edge->getFVarInfSharp(), fvarbitsSizePerEdge * sizeof(unsigned int));
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}
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}
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// Returns whether the edge is infinitely sharp in facevarying for
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// a particular facevarying datum
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bool GetFVarInfiniteSharp(int datum);
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// Returns whether the edge is infinitely sharp in any facevarying
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// datum
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bool IsFVarInfiniteSharpAnywhere();
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// Get the sharpness relative to facevarying data
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float GetFVarSharpness(int datum, bool ignoreGeometry=false);
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// Returns the (raw) sharpness of the edge
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float GetSharpness() const { return sharpness; }
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// Sets the sharpness of the edge
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void SetSharpness(float sharp) { sharpness = sharp; if (opposite) opposite->sharpness = sharp; ClearMask(); }
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// Returns whether the edge is sharp at the current level of
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// subdivision (next = false) or at the next level of subdivision
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// (next = true).
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bool IsSharp(bool next) const { return (next ? (sharpness > 0.0f) : (sharpness >= 1.0f)); }
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// Clears the masks of the adjacent edge vertices. Usually called
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// when a change in edge sharpness occurs.
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void ClearMask() { GetOrgVertex()->ClearMask(); GetDestVertex()->ClearMask(); }
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// Subdivide the edge into a vertex if needed and return
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HbrVertex<T>* Subdivide();
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// Make sure the edge has its opposite face
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void GuaranteeNeighbor();
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// Remove the reference to subdivided vertex
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void RemoveChild() { vchild = 0; }
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// Sharpness constants
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enum Mask {
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k_Smooth = 0,
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k_Sharp = 1,
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k_InfinitelySharp = 10
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};
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#ifdef HBRSTITCH
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StitchEdge* GetStitchEdge(int i) {
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StitchEdge **stitchEdge = getStitchEdges();
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// If the stitch edge exists, the ownership is transferred to
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// the caller. Make sure the opposite edge loses ownership as
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// well.
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if (stitchEdge[i]) {
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if (opposite) {
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opposite->getStitchEdges()[i] = 0;
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}
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return StitchGetEdge(&stitchEdge[i]);
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}
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// If the stitch edge does not exist then we create one now.
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// Make sure the opposite edge gets a copy of it too
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else {
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StitchGetEdge(&stitchEdge[i]);
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if (opposite) {
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opposite->getStitchEdges()[i] = stitchEdge[i];
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}
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return stitchEdge[i];
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}
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}
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// If stitch edge exists, and this edge has no opposite, destroy
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// it
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void DestroyStitchEdges(int stitchcount) {
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if (!opposite) {
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StitchEdge **stitchEdge = getStitchEdges();
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for (int i = 0; i < stitchcount; ++i) {
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if (stitchEdge[i]) {
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StitchFreeEdge(stitchEdge[i]);
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stitchEdge[i] = 0;
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}
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}
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}
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}
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StitchEdge* GetRayStitchEdge(int i) {
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return GetStitchEdge(i + 2);
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}
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// Splits our split edge between our children. We'd better have
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// subdivided this edge by this point
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void SplitStitchEdge(int i) {
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StitchEdge* se = GetStitchEdge(i);
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HbrHalfedge<T>* ea = GetOrgVertex()->Subdivide()->GetEdge(Subdivide());
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HbrHalfedge<T>* eb = Subdivide()->GetEdge(GetDestVertex()->Subdivide());
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StitchEdge **ease = ea->getStitchEdges();
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StitchEdge **ebse = eb->getStitchEdges();
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if (i >= 2) { // ray tracing stitches
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if (!raystitchccw) {
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StitchSplitEdge(se, &ease[i], &ebse[i], false, 0, 0, 0);
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} else {
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StitchSplitEdge(se, &ebse[i], &ease[i], true, 0, 0, 0);
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}
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ea->raystitchccw = eb->raystitchccw = raystitchccw;
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if (eb->opposite) {
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eb->opposite->getStitchEdges()[i] = ebse[i];
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eb->opposite->raystitchccw = raystitchccw;
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}
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if (ea->opposite) {
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ea->opposite->getStitchEdges()[i] = ease[i];
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ea->opposite->raystitchccw = raystitchccw;
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}
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} else {
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if (!stitchccw) {
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StitchSplitEdge(se, &ease[i], &ebse[i], false, 0, 0, 0);
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} else {
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StitchSplitEdge(se, &ebse[i], &ease[i], true, 0, 0, 0);
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}
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ea->stitchccw = eb->stitchccw = stitchccw;
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if (eb->opposite) {
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eb->opposite->getStitchEdges()[i] = ebse[i];
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eb->opposite->stitchccw = stitchccw;
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}
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if (ea->opposite) {
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ea->opposite->getStitchEdges()[i] = ease[i];
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ea->opposite->stitchccw = stitchccw;
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}
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}
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}
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void SplitRayStitchEdge(int i) {
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SplitStitchEdge(i + 2);
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}
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void SetStitchEdge(int i, StitchEdge* edge) {
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StitchEdge **stitchEdges = getStitchEdges();
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stitchEdges[i] = edge;
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if (opposite) {
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opposite->getStitchEdges()[i] = edge;
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}
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}
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void SetRayStitchEdge(int i, StitchEdge* edge) {
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StitchEdge **stitchEdges = getStitchEdges();
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stitchEdges[i+2] = edge;
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if (opposite) {
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opposite->getStitchEdges()[i+2] = edge;
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}
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}
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void* GetStitchData() const {
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if (stitchdatavalid) return *(incidentFace->stitchDatas + GetIndex());
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else return 0;
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}
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void SetStitchData(void* data) {
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*(incidentFace->stitchDatas + GetIndex()) = data;
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stitchdatavalid = data ? 1 : 0;
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if (opposite) {
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*(opposite->incidentFace->stitchDatas + opposite->GetIndex()) = data;
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opposite->stitchdatavalid = stitchdatavalid;
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}
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}
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bool GetStitchCCW(bool raytraced) const { return raytraced ? raystitchccw : stitchccw; }
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void ClearStitchCCW(bool raytraced) {
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if (raytraced) {
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raystitchccw = 0;
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if (opposite) opposite->raystitchccw = 0;
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} else {
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stitchccw = 0;
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if (opposite) opposite->stitchccw = 0;
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}
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}
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void ToggleStitchCCW(bool raytraced) {
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if (raytraced) {
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raystitchccw = 1 - raystitchccw;
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if (opposite) opposite->raystitchccw = raystitchccw;
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} else {
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stitchccw = 1 - stitchccw;
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if (opposite) opposite->stitchccw = stitchccw;
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}
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}
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#endif
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// Marks the edge as being "coarse" (belonging to the control
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// mesh). Generally this distinction only needs to be made if
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// we're worried about interpolateboundary behaviour
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void SetCoarse(bool c) { coarse = c; }
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bool IsCoarse() const { return coarse; }
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private:
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HbrHalfedge<T>* opposite;
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HbrFace<T>* incidentFace;
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HbrVertex<T>* incidentVertex;
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// Child vertex
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HbrVertex<T>* vchild;
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float sharpness;
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#ifdef HBRSTITCH
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unsigned char stitchccw:1;
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unsigned char raystitchccw:1;
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unsigned char stitchdatavalid:1;
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#endif
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unsigned char coarse:1;
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unsigned char lastedge:1;
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unsigned char firstedge:1;
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// Returns bitmask indicating whether a given facevarying datum
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// for the edge is infinitely sharp. Each datum has two bits, and
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// if those two bits are set to 3, it means the status has not
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// been computed yet.
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unsigned int *getFVarInfSharp() {
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unsigned int *fvarbits = incidentFace->fvarbits;
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if (fvarbits) {
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int fvarbitsSizePerEdge = ((GetMesh()->GetFVarCount() + 15) / 16);
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return fvarbits + GetIndex() * fvarbitsSizePerEdge;
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} else {
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return 0;
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}
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}
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#ifdef HBRSTITCH
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StitchEdge **getStitchEdges() {
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return incidentFace->stitchEdges + GetMesh()->GetStitchCount() * GetIndex();
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}
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#endif
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#ifdef HBR_ADAPTIVE
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public:
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struct adaptiveFlags {
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unsigned isTransition:1;
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unsigned isTriangleHead:1;
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unsigned isWatertightCritical:1;
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adaptiveFlags() : isTransition(0),isTriangleHead(0),isWatertightCritical(0) { }
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};
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adaptiveFlags _adaptiveFlags;
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bool IsTransition() const { return _adaptiveFlags.isTransition; }
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bool IsTriangleHead() const { return _adaptiveFlags.isTriangleHead; }
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bool IsWatertightCritical() const { return _adaptiveFlags.isWatertightCritical; }
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#endif
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};
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template <class T>
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void
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HbrHalfedge<T>::Initialize(HbrHalfedge<T>* opposite, int index, HbrVertex<T>* origin, unsigned int *fvarbits, HbrFace<T>* face) {
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this->opposite = opposite;
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incidentVertex = origin;
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incidentFace = face;
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lastedge = (index == face->GetNumVertices() - 1);
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firstedge = (index == 0);
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if (opposite) {
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sharpness = opposite->sharpness;
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#ifdef HBRSTITCH
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StitchEdge **stitchEdges = getStitchEdges();
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for (int i = 0; i < face->GetMesh()->GetStitchCount(); ++i) {
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stitchEdges[i] = opposite->getStitchEdges()[i];
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}
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stitchccw = opposite->stitchccw;
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raystitchccw = opposite->raystitchccw;
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stitchdatavalid = 0;
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if (stitchEdges && opposite->GetStitchData()) {
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*(incidentFace->stitchDatas + index) = opposite->GetStitchData();
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stitchdatavalid = 1;
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}
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#endif
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if (fvarbits) {
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const int fvarcount = face->GetMesh()->GetFVarCount();
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int fvarbitsSizePerEdge = ((fvarcount + 15) / 16);
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memcpy(fvarbits, opposite->getFVarInfSharp(), fvarbitsSizePerEdge * sizeof(unsigned int));
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}
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} else {
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sharpness = 0.0f;
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#ifdef HBRSTITCH
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StitchEdge **stitchEdges = getStitchEdges();
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for (int i = 0; i < face->GetMesh()->GetStitchCount(); ++i) {
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stitchEdges[i] = 0;
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}
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stitchccw = 1;
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raystitchccw = 1;
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stitchdatavalid = 0;
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#endif
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if (fvarbits) {
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const int fvarcount = face->GetMesh()->GetFVarCount();
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int fvarbitsSizePerEdge = ((fvarcount + 15) / 16);
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memset(fvarbits, 0xff, fvarbitsSizePerEdge * sizeof(unsigned int));
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}
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}
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}
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template <class T>
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HbrHalfedge<T>::~HbrHalfedge() {
|
|
Clear();
|
|
}
|
|
|
|
template <class T>
|
|
void
|
|
HbrHalfedge<T>::Clear() {
|
|
if (opposite) {
|
|
opposite->opposite = 0;
|
|
if (vchild) {
|
|
// Transfer ownership of the vchild to the opposite ptr
|
|
opposite->vchild = vchild;
|
|
// Done this way just for assertion sanity
|
|
vchild->SetParent(static_cast<HbrHalfedge*>(0));
|
|
vchild->SetParent(opposite);
|
|
vchild = 0;
|
|
}
|
|
opposite = 0;
|
|
}
|
|
// Orphan the child vertex
|
|
else if (vchild) {
|
|
vchild->SetParent(static_cast<HbrHalfedge*>(0));
|
|
vchild = 0;
|
|
}
|
|
}
|
|
|
|
template <class T>
|
|
HbrVertex<T>*
|
|
HbrHalfedge<T>::Subdivide() {
|
|
if (vchild) return vchild;
|
|
// Make sure that our opposite doesn't "own" a subdivided vertex
|
|
// already. If it does, use that
|
|
if (opposite && opposite->vchild) return opposite->vchild;
|
|
HbrMesh<T>* mesh = GetMesh();
|
|
vchild = mesh->GetSubdivision()->Subdivide(mesh, this);
|
|
vchild->SetParent(this);
|
|
return vchild;
|
|
}
|
|
|
|
template <class T>
|
|
void
|
|
HbrHalfedge<T>::GuaranteeNeighbor() {
|
|
HbrMesh<T>* mesh = GetMesh();
|
|
mesh->GetSubdivision()->GuaranteeNeighbor(mesh, this);
|
|
}
|
|
|
|
// Determines whether an edge is infinitely sharp as far as its
|
|
// facevarying data is concerned. Happens if the faces on both sides
|
|
// disagree on the facevarying data at either of the shared vertices
|
|
// on the edge.
|
|
template <class T>
|
|
bool
|
|
HbrHalfedge<T>::GetFVarInfiniteSharp(int datum) {
|
|
|
|
// Check to see if already initialized
|
|
int intindex = datum >> 4;
|
|
int shift = (datum & 15) << 1;
|
|
unsigned int *fvarinfsharp = getFVarInfSharp();
|
|
unsigned int bits = (fvarinfsharp[intindex] >> shift) & 0x3;
|
|
if (bits != 3) {
|
|
assert (bits != 2);
|
|
return bits ? true : false;
|
|
}
|
|
|
|
// If there is no face varying data it can't be infinitely sharp!
|
|
const int fvarwidth = GetMesh()->GetTotalFVarWidth();
|
|
if (!fvarwidth) {
|
|
bits = ~(0x3 << shift);
|
|
fvarinfsharp[intindex] &= bits;
|
|
if (opposite) opposite->getFVarInfSharp()[intindex] &= bits;
|
|
return false;
|
|
}
|
|
|
|
// If either incident face is missing, it's a geometric boundary
|
|
// edge, and also a facevarying boundary edge
|
|
HbrFace<T>* left = GetLeftFace(), *right = GetRightFace();
|
|
if (!left || !right) {
|
|
bits = ~(0x2 << shift);
|
|
fvarinfsharp[intindex] &= bits;
|
|
if (opposite) opposite->getFVarInfSharp()[intindex] &= bits;
|
|
return true;
|
|
}
|
|
|
|
// Look for the indices on each face which correspond to the
|
|
// origin and destination vertices of the edge
|
|
int lorg = -1, ldst = -1, rorg = -1, rdst = -1, i, nv;
|
|
HbrHalfedge<T>* e;
|
|
e = left->GetFirstEdge();
|
|
nv = left->GetNumVertices();
|
|
for (i = 0; i < nv; ++i) {
|
|
if (e->GetOrgVertex() == GetOrgVertex()) lorg = i;
|
|
if (e->GetOrgVertex() == GetDestVertex()) ldst = i;
|
|
e = e->GetNext();
|
|
}
|
|
e = right->GetFirstEdge();
|
|
nv = right->GetNumVertices();
|
|
for (i = 0; i < nv; ++i) {
|
|
if (e->GetOrgVertex() == GetOrgVertex()) rorg = i;
|
|
if (e->GetOrgVertex() == GetDestVertex()) rdst = i;
|
|
e = e->GetNext();
|
|
}
|
|
assert(lorg >= 0 && ldst >= 0 && rorg >= 0 && rdst >= 0);
|
|
// Compare the facevarying data to some tolerance
|
|
const int startindex = GetMesh()->GetFVarIndices()[datum];
|
|
const int width = GetMesh()->GetFVarWidths()[datum];
|
|
if (!right->GetFVarData(rorg).Compare(left->GetFVarData(lorg), startindex, width, 0.001f) ||
|
|
!right->GetFVarData(rdst).Compare(left->GetFVarData(ldst), startindex, width, 0.001f)) {
|
|
bits = ~(0x2 << shift);
|
|
fvarinfsharp[intindex] &= bits;
|
|
if (opposite) opposite->getFVarInfSharp()[intindex] &= bits;
|
|
return true;
|
|
}
|
|
|
|
bits = ~(0x3 << shift);
|
|
fvarinfsharp[intindex] &= bits;
|
|
if (opposite) opposite->getFVarInfSharp()[intindex] &= bits;
|
|
return false;
|
|
}
|
|
|
|
template <class T>
|
|
bool
|
|
HbrHalfedge<T>::IsFVarInfiniteSharpAnywhere() {
|
|
for (int i = 0; i < GetMesh()->GetFVarCount(); ++i) {
|
|
if (GetFVarInfiniteSharp(i)) return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
template <class T>
|
|
float
|
|
HbrHalfedge<T>::GetFVarSharpness(int datum, bool ignoreGeometry) {
|
|
|
|
bool infsharp = GetFVarInfiniteSharp(datum);
|
|
|
|
if (infsharp) return k_InfinitelySharp;
|
|
|
|
if (!ignoreGeometry) {
|
|
// If it's a geometrically sharp edge it's going to be a
|
|
// facevarying sharp edge too
|
|
if (sharpness > k_Smooth) {
|
|
return k_InfinitelySharp;
|
|
}
|
|
}
|
|
return k_Smooth;
|
|
}
|
|
|
|
|
|
template <class T>
|
|
std::ostream&
|
|
operator<<(std::ostream& out, const HbrHalfedge<T>& edge) {
|
|
if (edge.IsBoundary()) out << "boundary ";
|
|
out << "edge connecting ";
|
|
if (edge.GetOrgVertex())
|
|
out << *edge.GetOrgVertex();
|
|
else
|
|
out << "(none)";
|
|
out << " to ";
|
|
if (edge.GetDestVertex()) {
|
|
out << *edge.GetDestVertex();
|
|
} else {
|
|
out << "(none)";
|
|
}
|
|
return out;
|
|
}
|
|
|
|
// Sorts half edges by the relative ordering of the incident faces'
|
|
// paths.
|
|
template <class T>
|
|
class HbrHalfedgeCompare {
|
|
public:
|
|
bool operator() (const HbrHalfedge<T>* a, HbrHalfedge<T>* b) const {
|
|
return (a->GetFace()->GetPath() < b->GetFace()->GetPath());
|
|
}
|
|
};
|
|
|
|
template <class T>
|
|
class HbrHalfedgeOperator {
|
|
public:
|
|
virtual void operator() (HbrHalfedge<T> &edge) = 0;
|
|
virtual ~HbrHalfedgeOperator() {}
|
|
};
|
|
|
|
} // end namespace OPENSUBDIV_VERSION
|
|
using namespace OPENSUBDIV_VERSION;
|
|
|
|
} // end namespace OpenSubdiv
|
|
|
|
#endif /* HBRHALFEDGE_H */
|