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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 SoNormalElement 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_NORMAL_ELEMENT
#define _SO_NORMAL_ELEMENT
#include <Inventor/SbLinear.h>
#include <Inventor/elements/SoReplacedElement.h>
#include <Inventor/errors/SoDebugError.h>
//////////////////////////////////////////////////////////////////////////////
//
// Class: SoNormalElement
//
// Element that stores the current surface normals.
//
// This class allows read-only access to the top element in the state
// to make accessing several values in it more efficient. Individual
// values must be accessed through this instance.
//
//////////////////////////////////////////////////////////////////////////////
SoEXTENDER class SoNormalElement : public SoReplacedElement {
SO_ELEMENT_HEADER(SoNormalElement);
public:
// Initializes element
virtual void init(SoState *state);
// Sets the current normals
static void set(SoState *state, SoNode *node,
int32_t numNormals, const SbVec3f *normals);
// Returns the top (current) instance of the element in the state
static const SoNormalElement * getInstance(SoState *state)
{return (const SoNormalElement *)
getConstElement(state, classStackIndex);}
// Returns the number of normal vectors in an instance
int32_t getNum() const { return numNormals; }
// Returns the indexed normal from an element
const SbVec3f & get(int index) const
{
#ifdef DEBUG
if (index < 0 || index >= numNormals)
SoDebugError::post("SoNormalElement::get",
"Index (%d) is out of range 0 - %d",
index, numNormals - 1);
#endif /* DEBUG */
return normals[index];
}
// Prints element (for debugging)
virtual void print(FILE *fp) const;
SoINTERNAL public:
// Initializes the SoNormalElement class
static void initClass();
protected:
int32_t numNormals;
const SbVec3f *normals;
virtual ~SoNormalElement();
private:
// This stores a pointer to the default normal so that we can set
// "normals" to point to it if no other normal has been set.
static SbVec3f *defaultNormal;
};
#endif /* _SO_NORMAL_ELEMENT */
|
