subd_build.h

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/*
 * Copyright 2011, Blender Foundation.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */

#ifndef __SUBD_BUILD_H__
#define __SUBD_BUILD_H__

CCL_NAMESPACE_BEGIN

class SubdFace;
class SubdFaceRing;
class SubdVert;
class GregoryAccStencil;
class Patch;
class StencilMask;

/* Builder */

class SubdBuilder
{
public:
    virtual ~SubdBuilder() {};
    virtual Patch *run(SubdFace *face) = 0;
    static SubdBuilder *create(bool linear);
};

/* Approximate Catmull Clark using Loop's approximation */

class SubdAccBuilder : public SubdBuilder
{
public:
    SubdAccBuilder();
    ~SubdAccBuilder();

    Patch *run(SubdFace *face);

protected:
    /* Gregory Patch */
    void computeCornerStencil(SubdFaceRing *ring, GregoryAccStencil *stencil);
    void computeEdgeStencil(SubdFaceRing *ring, GregoryAccStencil *stencil);
    void computeInteriorStencil(SubdFaceRing *ring, GregoryAccStencil *stencil);
    void computeBoundaryTangentStencils(SubdFaceRing *ring,
        SubdVert *vert,
        StencilMask & r0, StencilMask & r1);
};

/* Linear Subdivision */

class SubdLinearBuilder : public SubdBuilder
{
public:
    SubdLinearBuilder();
    ~SubdLinearBuilder();

    Patch *run(SubdFace *face);
};

CCL_NAMESPACE_END

#endif /* __SUBD_BUILD_H__ */