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/*
*
* Copyright (C) 2000 Silicon Graphics, Inc. All Rights Reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* 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 GNU
* Lesser General Public License for more details.
*
* Further, this software is distributed without any warranty that it is
* free of the rightful claim of any third person regarding infringement
* or the like. Any license provided herein, whether implied or
* otherwise, applies only to this software file. Patent licenses, if
* any, provided herein do not apply to combinations of this program with
* other software, or any other product whatsoever.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
* Mountain View, CA 94043, or:
*
* http://www.sgi.com
*
* For further information regarding this notice, see:
*
* http://oss.sgi.com/projects/GenInfo/NoticeExplan/
*
*/
// -*- C++ -*-
/*
* Copyright (C) 1990,91 Silicon Graphics, Inc.
*
_______________________________________________________________________
______________ S I L I C O N G R A P H I C S I N C . ____________
|
| $Revision: 1.1.1.1 $
|
| Description:
| This file defines the SoGLModelMatrixElement class.
|
| Author(s) : Paul S. Strauss
|
______________ S I L I C O N G R A P H I C S I N C . ____________
_______________________________________________________________________
*/
#ifndef _SO_GL_MODEL_MATRIX_ELEMENT
#define _SO_GL_MODEL_MATRIX_ELEMENT
#include <Inventor/elements/SoModelMatrixElement.h>
//////////////////////////////////////////////////////////////////////////////
//
// Class: SoGLModelMatrixElement
//
// Element that stores the current model matrix in GL. Overrides the
// virtual methods on SoModelMatrixElement to send the matrix to GL
// when necessary.
//
// Note that this class relies on SoModelMatrixElement to store the
// matrix in the instance. This is less expensive in the long run
// than asking GL for the matrix when it is needed.
//
// Because GL stores the model and view matrices in one matrix, this
// has to do a little extra work when setting the model matrix to
// identity or another matrix. (It has to set the GL model-view
// matrix correctly.)
//
//////////////////////////////////////////////////////////////////////////////
SoEXTENDER class SoGLModelMatrixElement : public SoModelMatrixElement {
SO_ELEMENT_HEADER(SoGLModelMatrixElement);
public:
// Initializes element
virtual void init(SoState *state);
// Override push()/pop() methods so side effects can occur in GL
virtual void push(SoState *state);
virtual void pop(SoState *state, const SoElement *prevTopElement);
SoINTERNAL public:
// Initializes the SoGLModelMatrixElement class
static void initClass();
protected:
// Overrides SoModelMatrixElement::makeEltIdentity() to print an
// error message
virtual void makeEltIdentity();
// Sets the matrix in an instance to the given matrix. Assumes
// that the passed matrix contains the correct combination of view
// and model matrices.
virtual void setElt(const SbMatrix &matrix);
// Multiplies into the matrix in an instance
virtual void multElt(const SbMatrix &matrix);
// Each of these performs the appropriate operation on the matrix
// in an instance
virtual void translateEltBy(const SbVec3f &translation);
virtual void rotateEltBy(const SbRotation &translation);
virtual void scaleEltBy(const SbVec3f &scaleFactor);
virtual SbMatrix pushMatrixElt();
virtual void popMatrixElt(const SbMatrix &m);
virtual ~SoGLModelMatrixElement();
private:
// We need to save the state to access the viewing matrix
SoState *state;
// And we need to remember the nodeId of the viewing matrix
// element to see if it changes between pushMatrixElt() and
// popMatrixElt().
uint32_t viewEltNodeId;
};
#endif /* _SO_GL_MODEL_MATRIX_ELEMENT */
|
