VRS - The Virtual Rendering System

version 3.3

backgroundgl.h

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 /**********************************************************************
 VRS - The Virtual Rendering System
 Copyright (C) 2001 Computer Graphics Systems Group at the 
 Hasso-Plattner-Institute, Potsdam, Germany.
 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.
 You should have received a copy of the GNU Lesser+ General Public
 License along with this library; if not, write to the FreeSoftware 
 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA, 02111-1307, USA.
 **********************************************************************/
// $Id: backgroundgl.h 6014 2007-08-09 07:51:16Z Konstantin_Baumann $
// $Date: 2007-08-09 09:51:16 +0200 (Thu, 09 Aug 2007) $
// $Revision: 6014 $
// $State$
// $Author: Konstantin_Baumann $
//
// $Log$
// Revision 1.24  2006/03/08 15:17:05  buchholz
// background rendering method is now available from outside to
// allow collaboration with reflection techniques
//
// Revision 1.23  2005/01/03 01:43:09  klimetschek
// - modified win32 project layout, splitted vrs.vcproj into vrs_container, vrs_core, vrs_sg, vrs_image, vrs_opengl and vrs_io
// - removed vrs.vcproj
// minor things:
// - added all glutexamples to vrs4glut.sln
// - fixed some problems in glutexamples
// - removed all project references from all VS projects (using solution wide project dependencies instead)
//
// Revision 1.22  2004/03/12 16:28:40  baumann
// macros VRS_NAMESPACE_BEGIN/_END expanded and removed
//
// Revision 1.21  2004/01/19 11:43:58  baumann
// serialization mechanism improved
//
// Revision 1.20  2004/01/19 07:28:02  baumann
// serialization mechanism improved
//
// Revision 1.19  2003/12/07 16:39:31  baumann
// additional ctor added
//
// Revision 1.18  2003/07/23 17:04:49  baumann
// code cleanup (especially untabified)
//
// Revision 1.17  2003/06/17 11:56:14  buchholz
// missing projection-not-supported-warning included
//
// Revision 1.16  2003/06/11 15:48:28  buchholz
// Added: Automatic 3D texture coordinate computing for cube map textures.
//
// Revision 1.15  2002/12/05 10:25:05  baumann
// BackgroundGL can use a TextureGL-object as background image
// (e.g. for images, pbuffer textures or video streams)
//
// Revision 1.14  2002/10/29 10:32:52  baumann
// macros VRS_CLASSNAME_* and VRS_IMPL_TYPEINFO_* removed
//
// Revision 1.13  2002/04/21 11:09:59  guenther
// made persistent
//
// Revision 1.12  2002/03/03 21:44:25  kosta
// VRS_TYPEINFO-macro rewritten
//
// Revision 1.11  2002/02/19 10:34:17  kosta
// undone all changes since 2002-02-15
//
// Revision 1.8  2002/01/15 16:25:54  kosta
// macros rewritten for a better namespace support
//
// Revision 1.7  2001/11/25 20:24:19  kirsch
// GCC 3.0 fix: added class in friend declaration
//
// Revision 1.6  2001/11/13 16:36:31  kirsch
// changed line feed to unix style (removed control-M)
//
// Revision 1.5  2001/09/05 10:56:11  kirsch
// Documentation updates
//
// Revision 1.4  2001/08/30 13:39:27  kirsch
// CTor of BackgroundGL is now called with two colors and a direction. With
// such a non-unicolor background, the MaintechniqueGL doesn't clear the
// framebuffer anymore
//
// Revision 1.3  2001/08/29 12:09:10  kirsch
// removed background color from canvas, use BackgroundGL instead
//
// Revision 1.2  2001/08/29 08:22:39  kirsch
// constant color constructor
//
// Revision 1.1  2001/08/27 20:36:53  kirsch
// Added BackgroundGL
//
//

#ifndef VRS_OPENGL_BACKGROUNDGL_H
#define VRS_OPENGL_BACKGROUNDGL_H

#include <vrs/color.h>
#include <vrs/opengl/techniquegl.h>

namespace VRS {

class TextureGL;

//- BackgroundTechniqueGL
class VRS_CORE_API BackgroundGL : public TechniqueGL {
public: 

    enum Direction { TopToBottom, LeftToRight };
    VRS_SERIALIZABLE_CLASS_ENUM(Direction);

    BackgroundGL(double intensity=1);
    BackgroundGL(double r, double g, double b, double a=1.0);
    BackgroundGL(const Color& color);
    BackgroundGL(const Color& c0, const Color& c1, Direction direction = BackgroundGL::TopToBottom);
    BackgroundGL(TextureGL* backgroundTexture);
    void setColor(const Color& color, int index);
    Color getColor(int index) const;

    void setDirection(BackgroundGL::Direction direction);
    BackgroundGL::Direction getDirection() const;

    void setTexture(TextureGL* backgroundTexture);
    TextureGL* getTexture() const;

    virtual bool preparePass(Engine*);
    virtual void finishPass(Engine*) { }

    virtual bool prepareEval(Engine*, const Shape*) { return false; }
    virtual void finishEval(Engine*, const Shape*) { }


    bool renderBackground(Engine* engine);

    VRS_TYPEINFO(BackgroundGL, TechniqueGL);
    VRS_SERIALIZABLE(BackgroundGL);

private:
    Direction direction_;
    Color c_[2];
    SO<TextureGL> texture_;
};

} // namespace VRS

#endif // VRS_OPENGL_BACKGROUNDGL_H

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