VRS - The Virtual Rendering System

version 3.3

pbuffercanvasgl.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: pbuffercanvasgl.h 6628 2009-01-13 14:08:52Z Manuel_Wellmann $
// $Date: 2009-01-13 15:08:52 +0100 (Tue, 13 Jan 2009) $
// $Revision: 6628 $
// $State$
// $Author: Manuel_Wellmann $
//
// $Log$
// Revision 1.36  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 1.35  2004/11/09 15:07:24  kirsch
// further changes to class comments due to doxygen
//
// Revision 1.34  2004/11/03 14:45:06  saar
// Class comment changed (Doxygen style)
//
// Revision 1.33  2004/03/12 16:28:40  baumann
// macros VRS_NAMESPACE_BEGIN/_END expanded and removed
//
// Revision 1.32  2003/12/11 15:11:07  kirsch
// made prepareRedisplay() and finishRedisplay() public
//
// Revision 1.31  2003/10/27 13:40:38  skirsch
// added canvas query functionality to the engine, restructured canvas redisplay, and added dpi query functionality to the canvas
//
// Revision 1.30  2003/01/28 09:39:27  kirsch
// make PBufferManager a protected friend of PBufferCanvas
//
// Revision 1.29  2002/11/29 11:42:35  skirsch
// fixed some bugs (restoring the context) but not all, which occur, when using a pbuffer without creating another gl canvas before
//
// Revision 1.28  2002/11/22 10:33:01  kirsch
// added updateTextureArea
//
// Revision 1.27  2002/11/08 11:04:49  baumann
// mipmap flag added to method newTexture()
//
// Revision 1.26  2002/11/01 12:00:43  kirsch
// impl cleanups
//
// Revision 1.25  2002/10/29 10:32:52  baumann
// macros VRS_CLASSNAME_* and VRS_IMPL_TYPEINFO_* removed
//
// Revision 1.24  2002/10/24 14:15:25  kirsch
// made canvas width and height unsigned
// added getProperties to GLCanvas and subclasses
//
// Revision 1.23  2002/10/24 06:49:55  baumann
// new method added: redisplay(Texture2DGL* texture)
//
// Revision 1.22  2002/09/19 07:44:19  kirsch
// added GLCanvas::create() and GLCanvas::destroy()
// all sub-classes use those methods to create and destroy engine and processor
//
// Revision 1.21  2002/08/23 15:13:35  baumann
// added properties argument to c'tor (default value is: RGBADS)
//
// Revision 1.20  2002/08/22 14:11:18  baumann
// new static method isSupported() added
//
// Revision 1.19  2002/07/15 12:24:42  kirsch
// added experimental support for WGL_ARB_render_texture,
// and basic support for cube map textures
//
// Revision 1.18  2002/04/16 15:47:41  baumann
// checking if bound texture format matches the specified parameters (for glCopyTexSubImage2D())
//
// Revision 1.17  2002/04/11 11:06:34  baumann
// code cleanup
// fixed bugs when used in combination with Qt
//
// Revision 1.16  2002/03/04 12:00:26  kersting
// directory structure changes
//
// Revision 1.15  2002/03/03 21:44:26  kosta
// VRS_TYPEINFO-macro rewritten
//
// Revision 1.14  2002/02/19 10:34:19  kosta
// undone all changes since 2002-02-15
//
// Revision 1.11  2002/02/06 13:28:39  kersting
// added newTexture method and renamed readTexture to updateTexture
//
// Revision 1.10  2002/01/15 16:25:55  kosta
// macros rewritten for a better namespace support
//
// Revision 1.9  2002/01/08 16:02:49  kosta
// dir structure for textures changed
//
// Revision 1.8  2002/01/07 07:33:02  kirsch
// Removed Windows-style line endings
//
// Revision 1.7  2002/01/04 13:12:22  doellner
// Redesign of canvas classes. Studio merged into Canvas, and removed. GLCanvas added, OpenGLCanvas removed.
//
// Revision 1.6  2001/11/13 16:36:31  kirsch
// changed line feed to unix style (removed control-M)
//
// Revision 1.5  2001/08/29 12:09:10  kirsch
// removed background color from canvas, use BackgroundGL instead
//
// Revision 1.4  2001/08/27 08:44:17  kersting
// added OpenGLCanvas base class
//
// Revision 1.3  2001/08/21 09:39:04  kersting
// added classname to enumeration
//
// Revision 1.2  2001/08/09 15:37:10  kirsch
// Added shadows in OpenGL, created with alpha depthmaps.
// Still experimental, some flaws
//
// Revision 1.1  2001/08/04 16:59:40  kosta
// initial version
//

#ifndef VRS_OPENGL_PBUFFERCANVASGL_H
#define VRS_OPENGL_PBUFFERCANVASGL_H

#include <vrs/opengl/glcanvas.h>
#include <vrs/opengl/cubemaptexturegl.h>
#include <vrs/opengl/texture2dgl.h>

namespace VRS {

class VRS_CORE_API PBufferCanvasGL : public GLCanvas {
public:
    PBufferCanvasGL(
        unsigned int width, unsigned int height, int properties = GLCanvas::RGBADS,
        GLCanvas* shareContextWith = NULL, 
        bool useRenderToTexture = false, GLenum renderToTextureFormat = GL_RGBA, 
        GLenum renderToTextureTarget = GL_TEXTURE_2D
    );
    virtual ~PBufferCanvasGL();

    static bool isSupported();
    static void disableSupport();
    
//    virtual void redisplay(Texture2DGL* texture);
//        /*!< Renders the scene graphs by an OpenGL engine.
//             After the evaluation, the given texture is updated. */

    Texture2DGL* getContentTexture();
    Texture2DGL* newTexture(GLenum format = GL_ZERO, bool useMipmap = false);
    void setCubeMapRenderTarget(CubeMapTextureGL::Side);
        virtual void setSize(unsigned int width, unsigned int height);
        virtual unsigned int getWidth() const;
        virtual unsigned int getHeight() const;
    virtual int getProperties() const;
    virtual bool prepareRedisplay();
    virtual void finishRedisplay();

    virtual void makeContextCurrent();
    virtual void releaseContext();

    void updateTexture(Texture2DGL* texture = 0);
    void updateTextureArea(Texture2DGL*, const Area&);
    void updateTexture(CubeMapTextureGL* texture, CubeMapTextureGL::Side, bool finished);
    void releaseTexture(Texture2DGL* texture);
    void releaseTexture(CubeMapTextureGL* texture);
    VRS_TYPEINFO(PBufferCanvasGL, GLCanvas);

protected:
    friend class PBufferManagerGL;

private:
    bool useRenderToTexture_;
    GLenum renderToTextureFormat_;
    GLenum renderToTextureTarget_;
    SO<Texture2DGL> texture_;
    int properties_;
        unsigned int width_;
        unsigned int height_;

    class Impl;
    Impl* impl_;

    static bool disabled_;
};

} // namespace VRS

#endif // VRS_OPENGL_PBUFFERCANVASGL_H

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