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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:
| Subclass of TextureCoordinateElement that also support GL
| rendering-- it has send() methods, and has a getType() that can
| return NONE, meaning shapes don't have to do anything to get
| texture coordinates generated for them (the GL's TexGen will do
| it for them).
|
| Author(s) : Gavin Bell
|
______________ S I L I C O N G R A P H I C S I N C . ____________
_______________________________________________________________________
*/
#ifndef _SO_GL_TEXTURE_COORDINATE_ELEMENT
#define _SO_GL_TEXTURE_COORDINATE_ELEMENT
#include <Inventor/SbLinear.h>
#include <Inventor/elements/SoTextureCoordinateElement.h>
//////////////////////////////////////////////////////////////////////////////
//
// Class: SoGLTextureCoordinateElement
//
// Element storing the current gltexture coordinates
//
//////////////////////////////////////////////////////////////////////////////
//
// The TextureCoordinateFunction nodes that use the GL texgen function
// to generate texture coordinates must register a callback that makes
// the appropriate GL calls with the element so pop() can reset the GL
// state back to what it should be. The TextureCoordinateFunction
// nodes that can't use the GL texgen function must register a NULL
// callback, in which case the element will disable the GL's automatic
// texture coordinate generation.
//
typedef void SoTexCoordTexgenCB(void *userdata);
SoEXTENDER class SoGLTextureCoordinateElement :
public SoTextureCoordinateElement {
SO_ELEMENT_HEADER(SoGLTextureCoordinateElement);
public:
// Initializes element.
virtual void init(SoState *state);
// TextureCoordinateFunction nodes that use texgen must define and
// register a callback that makes the appropriate GL calls.
// TextureCoordinateFunction nodes that don't use texgen must
// register a NULL callback to turn off texgen.
// The texGen arguments point to a function that will issue GL
// TexGen calls; the func arguments must point to a static
// function that will return the results of the texgen function
// (needed because some nodes render by using their
// generatePrimitives method).
static void setTexGen(SoState *state, SoNode *node,
SoTexCoordTexgenCB *texGenFunc, void *texGenData = NULL,
SoTextureCoordinateFunctionCB *func = NULL,
void *funcData = NULL);
// Returns code indicating what has been set in state/element
virtual CoordType getType() const;
// Returns the top (current) instance of the element in the state.
// The send routines are called on an instance
// because it is more efficient than calling a static method that
// looks up the element in the state for every coordinate.
static const SoGLTextureCoordinateElement * getInstance(SoState *state);
// Send routine for EXPLICIT case:
void send(int index) const;
// Override push() method to set up new instance
virtual void push(SoState *state);
// Override pop() method to maintain GL state
virtual void pop(SoState *state, const SoElement *prevTopElement);
SoINTERNAL public:
// Initializes the SoGLTextureCoordinateElement class
static void initClass();
protected:
void setElt(SoTexCoordTexgenCB *function,
void *userData = NULL);
virtual ~SoGLTextureCoordinateElement();
private:
SoTexCoordTexgenCB *texgenCB;
void *texgenCBData;
SoState *copiedFromParent;
};
#endif /* _SO_GL_TEXTURE_COORDINATE_ELEMENT */
|
