SoTextureCoordinateElement.h

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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
 *
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/*
 * 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 SoTextureCoordinateElement class.
 |   TextureCoordinates can be specified in several different ways,
 |   from several different nodes:  they can be explicitly given by
 |   TextureCoordinate2/4 nodes, they can be automatically generated
 |   (the TextureCoordinateFunction nodes), or they can be DEFAULT,
 |   meaning that each shape must generate its own texture
 |   coordinates (can be set by TextureCoordinateFunctionDefault
 |   node).
 |
 |   Shapes will have to call TextureCoordinateElement::getType() and
 |   then call either generate default texture coordinates if it
 |   returns DEFAULT, call get2/get4 if it returns EXPLICIT, or call
 |   get(point, normal) if it returns FUNCTION.
 |
 |   Author(s)          : Gavin Bell
 |
 ______________  S I L I C O N   G R A P H I C S   I N C .  ____________
 _______________________________________________________________________
 */
 
#ifndef  _SO_TEXTURE_COORDINATE_ELEMENT
#define  _SO_TEXTURE_COORDINATE_ELEMENT
 
#include <Inventor/SbLinear.h>
#include <Inventor/elements/SoReplacedElement.h>
 
 
typedef const SbVec4f &
        SoTextureCoordinateFunctionCB(void *userdata, const SbVec3f &point,
                                      const SbVec3f &normal);
 
SoEXTENDER class INVENTOR_API SoTextureCoordinateElement : public SoReplacedElement {
 
    SO_ELEMENT_HEADER(SoTextureCoordinateElement);
 
  public:
    enum CoordType {
        EXPLICIT = 1,   
        FUNCTION = 2    
    };
 
    virtual void        init(SoState *state);
 
    static void         setDefault(SoState *state, SoNode *node);
 
    static void         setFunction(SoState *state, SoNode *node,
                                    SoTextureCoordinateFunctionCB *func,
                                    void *userData);
    static void         set2(SoState *state, SoNode *node,
                             int32_t numCoords, const SbVec2f *coords);
    static void         set4(SoState *state, SoNode *node,
                             int32_t numCoords, const SbVec4f *coords);
 
    static CoordType    getType(SoState *state);
    virtual CoordType   getType() const;
 
    static const SoTextureCoordinateElement * getInstance(SoState *state);
 
 
    const SbVec4f &     get(const SbVec3f &point, const SbVec3f &normal) const;
 
 
    int32_t             getNum() const          { return numCoords; }
 
    bool                is2D() const            { return coordsAre2D; }
 
    const SbVec2f &     get2(int index) const;
    const SbVec4f &     get4(int index) const;
 
    virtual void        print(FILE *fp) const;
 
  SoINTERNAL public:
    static void         initClass();
 
  protected:
    CoordType           whatKind;
 
    SoTextureCoordinateFunctionCB       *funcCB;
    void                                *funcCBData;
 
    int32_t             numCoords;
    const SbVec2f       *coords2;
    const SbVec4f       *coords4;
    bool                coordsAre2D;
 
    virtual ~SoTextureCoordinateElement();
 
  private:
    SbVec2f             convert2;       
    SbVec4f             convert4;       
};
 
#endif /* _SO_TEXTURE_COORDINATE_ELEMENT */