Transform.h

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/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
 *
 * This library is open source and may be redistributed and/or modified under
 * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
 * (at your option) any later version.  The full license is in LICENSE file
 * included with this distribution, and on the openscenegraph.org website.
 *
 * This library 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
 * OpenSceneGraph Public License for more details.
*/

#ifndef OSG_TRANSFORM
#define OSG_TRANSFORM 1

#include <osg/Group>
#include <osg/Matrix>

#ifndef GL_RESCALE_NORMAL
#define GL_RESCALE_NORMAL       0x803A
#endif

#ifndef GL_NORMALIZE
#define GL_NORMALIZE            0x0BA1
#endif

namespace osg {



extern OSG_EXPORT Matrix computeLocalToWorld(const NodePath& nodePath, bool ignoreCameras = true);

extern OSG_EXPORT Matrix computeWorldToLocal(const NodePath& nodePath, bool ignoreCameras = true);

extern OSG_EXPORT Matrix computeLocalToEye(const Matrix& modelview, const NodePath& nodePath, bool ignoreCameras = true);

extern OSG_EXPORT Matrix computeEyeToLocal(const Matrix& modelview, const NodePath& nodePath, bool ignoreCameras = true);


class OSG_EXPORT Transform : public Group
{
    public :

        Transform();

        Transform(const Transform&,const CopyOp& copyop=CopyOp::SHALLOW_COPY);

        META_Node(osg, Transform);

        virtual Transform* asTransform() { return this; }
        virtual const Transform* asTransform() const { return this; }

        virtual MatrixTransform* asMatrixTransform() { return 0; }
        virtual const MatrixTransform* asMatrixTransform() const { return 0; }

        virtual PositionAttitudeTransform* asPositionAttitudeTransform() { return 0; }
        virtual const PositionAttitudeTransform* asPositionAttitudeTransform() const { return 0; }

        enum ReferenceFrame
        {
            RELATIVE_RF,
            ABSOLUTE_RF,
            ABSOLUTE_RF_INHERIT_VIEWPOINT
        };

        void setReferenceFrame(ReferenceFrame rf);

        ReferenceFrame getReferenceFrame() const { return _referenceFrame; }

        virtual bool computeLocalToWorldMatrix(Matrix& matrix,NodeVisitor*) const
        {
            if (_referenceFrame==RELATIVE_RF)
            {
                return false;
            }
            else // absolute
            {
                matrix.makeIdentity();
                return true;
            }
        }

        virtual bool computeWorldToLocalMatrix(Matrix& matrix,NodeVisitor*) const
        {
            if (_referenceFrame==RELATIVE_RF)
            {
                return false;
            }
            else // absolute
            {
                matrix.makeIdentity();
                return true;
            }
        }

        virtual BoundingSphere computeBound() const;

    protected :

        virtual ~Transform();


        ReferenceFrame                      _referenceFrame;

};

}

#endif