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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 SoNormalBundle 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_BUNDLE
#define _SO_NORMAL_BUNDLE
#include <Inventor/bundles/SoBundle.h>
#include <Inventor/elements/SoGLNormalElement.h>
#include <Inventor/misc/SoNormalGenerator.h>
//////////////////////////////////////////////////////////////////////////////
//
// Class: SoNormalBundle
//
// Bundle that allows shapes to deal with normals and normal bindings
// more easily. This class provides a fairly simple interface to
// normal handling, including normal generation.
//
// This class can be used during either rendering or primitive
// generation. For primitive generation, the get() method can be used
// to access normals. For GL rendering, the send() method can be used
// to send normals to GL.
//
//////////////////////////////////////////////////////////////////////////////
SoEXTENDER class SoNormalBundle : public SoBundle {
public:
// Constructor - takes the action the bundle is used for and a
// flag to indicate whether the bundle is being used for
// rendering. If this is TRUE, the bundle can be used to send
// normals to GL.
SoNormalBundle(SoAction *action, SbBool forRendering);
// Destructor
~SoNormalBundle();
// Returns TRUE if normals need to be generated.
SbBool shouldGenerate(int numNeeded);
// Initializes generation in the case where shouldGenerate() is
// not called. (shouldGenerate() does this automatically).
void initGenerator(int initialNum = 100);
//////////////////////
//
// If shouldGenerate() returns TRUE, these methods can be used by
// shapes to specify the geometry to generate normals for. They
// are front-ends to methods on the SoNormalGenerator class:
//
// Send a polygon's worth of vertices. Begin a polygon, send as
// many vertices as you want, and then end the polygon.
void beginPolygon()
{ generator->beginPolygon(); }
void polygonVertex(const SbVec3f &point)
{ generator->polygonVertex(point); }
void endPolygon()
{ generator->endPolygon(); }
// Send a triangle
void triangle(const SbVec3f &p1,
const SbVec3f &p2,
const SbVec3f &p3)
{ generator->triangle(p1, p2, p3); }
// Calculates the normals once all vertices have been sent. The
// normals are stored by the bundle so the caller does not have to
// deal with them directly. The startIndex argument specifies the
// index at which the generated normals will begin-- it can be
// used by shapes that allow the coordinates and normals to be
// offset (non-indexed shapes). If addToState is TRUE, the
// state will be pushed, the normals will be added to the
// state; otherwise, you can just use
// getGeneratedNormals/getNumGeneratedNormals to get the generated
// normals.
//
// The normal bundle DOES NOT FREE the generated normals! It is
// expected that normals will be added to a normal cache, and the
// normal cache will free the normals.
//
void generate(int startIndex = 0,
SbBool addToState=TRUE);
// Returns the generated normals.
const SbVec3f * getGeneratedNormals() const
{ return generator->getNormals(); }
int getNumGeneratedNormals() const
{ return generator->getNumNormals(); }
// This allows shapes that generate their own normals (for
// efficiency) to store the resulting normals in the state. The
// bundle takes care of pushing/popping the state.
// Note: This method only adds the normals to the state, it does
// NOT store a pointer to them (so you cannot call the
// getGenerated() routines)
void set(int32_t numNormals, const SbVec3f *normals);
// Returns indexed normal. This can be used for primitive
// generation or during rendering
const SbVec3f & get(int index) const { return normElt->get(index); }
// Sends indexed normal to the GL, for use only during GL rendering
void send(int index) const { GLNormElt->send(index); }
SoINTERNAL public:
SoNormalGenerator *generator; // Normal generator
private:
// Normal elements:
const SoNormalElement *normElt;
const SoGLNormalElement *GLNormElt;
SbBool isRendering; // Bundle being used for rendering
SbBool pushedState; // We pushed state to set normals
SoNode *currentNode; // Node that created the bundle
};
#endif /* _SO_NORMAL_BUNDLE */
|
