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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 SoGLMaterialIndexElement 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_MATERIAL_INDEX_ELEMENT
#define _SO_GL_MATERIAL_INDEX_ELEMENT
#include <Inventor/elements/SoReplacedElement.h>
//////////////////////////////////////////////////////////////////////////////
//
// Class: SoGLMaterialIndexElement
//
// Element that stores the indices into the current GL material map
// of the ambient, diffuse, and specular components of the current
// surface material, as defined by GL's color index lighting model.
//
// 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 SoGLMaterialIndexElement : public SoReplacedElement {
SO_ELEMENT_HEADER(SoGLMaterialIndexElement);
public:
// Initializes element
virtual void init(SoState *state);
// Sets the current material indices. Note that the given number
// of indices must be valid for the ambient, diffuse, and specular
// components.
static void set(SoState *state, SoNode *node,
int32_t numIndices,
const int32_t *ambientIndices,
const int32_t *diffuseIndices,
const int32_t *specularIndices);
// Returns the top (current) instance of the element in the state
static const SoGLMaterialIndexElement * getInstance(SoState *state);
// Returns the number of indices in an instance
int32_t getNum() const { return numIndices; }
// Returns the indexed indices from an element
int32_t getAmbient(int index) const;
int32_t getDiffuse(int index) const;
int32_t getSpecular(int index) const;
// Returns the default indices
static int32_t getDefaultAmbient() { return 1; }
static int32_t getDefaultDiffuse() { return 2; }
static int32_t getDefaultSpecular() { return 3; }
// Override push() and pop() methods to maintain GL state
virtual void push(SoState *state);
virtual void pop(SoState *state, const SoElement *prevTopElement);
// Override matches() to return TRUE only if node-id's match AND
// last values sent to GL match
virtual SbBool matches(const SoElement *elt) const;
// Create and return a copy of this element
virtual SoElement *copyMatchInfo() const;
// Prints element (for debugging)
virtual void print(FILE *fp) const;
// Sends indexed values to GL
void send(int index) const;
SoINTERNAL public:
// Initializes the SoGLMaterialIndexElement class
static void initClass();
protected:
int32_t numIndices;
const int32_t *ambientIndices, *diffuseIndices, *specularIndices;
virtual ~SoGLMaterialIndexElement();
private:
// These store the default indices so that we can set the
// appropriate "indices" members to point to them if no other
// indices have been set.
static int32_t defaultAmbientIndex;
static int32_t defaultDiffuseIndex;
static int32_t defaultSpecularIndex;
// Stores index of last indices sent to GL. We use this to avoid
// re-sending values when possible.
int lastIndex;
};
#endif /* _SO_GL_MATERIAL_INDEX_ELEMENT */
|
