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FXGLContext.h

00001 /********************************************************************************
00002 *                                                                               *
00003 *                        G L  C o n t e x t   C l a s s                         *
00004 *                                                                               *
00005 *********************************************************************************
00006 * Copyright (C) 2000,2002 by Jeroen van der Zijp.   All Rights Reserved.        *
00007 *********************************************************************************
00008 * This library is free software; you can redistribute it and/or                 *
00009 * modify it under the terms of the GNU Lesser General Public                    *
00010 * License as published by the Free Software Foundation; either                  *
00011 * version 2.1 of the License, or (at your option) any later version.            *
00012 *                                                                               *
00013 * This library is distributed in the hope that it will be useful,               *
00014 * but WITHOUT ANY WARRANTY; without even the implied warranty of                *
00015 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU             *
00016 * Lesser General Public License for more details.                               *
00017 *                                                                               *
00018 * You should have received a copy of the GNU Lesser General Public              *
00019 * License along with this library; if not, write to the Free Software           *
00020 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.    *
00021 *********************************************************************************
00022 * $Id: FXGLContext.h,v 1.8 2002/01/18 22:42:53 jeroen Exp $                     *
00023 ********************************************************************************/
00024 #ifndef FXGLCONTEXT_H
00025 #define FXGLCONTEXT_H
00026 
00027 //////////////////////////////  UNDER DEVELOPMENT  //////////////////////////////
00028 
00029 
00030 class FXApp;
00031 class FXDrawable;
00032 class FXGLVisual;
00033 
00034 
00035 /**
00036 * A GL context is an object representing the OpenGL state information.
00037 * Multiple GL context may share display lists to conserve memory.
00038 * When drawing multiple windows, it may be advantageous to share not only
00039 * display lists, but also GL contexts.  Since the GL context is created
00040 * for a certain frame-buffer configuration, sharing of GL contexts is
00041 * only possible if the windows sharing the GL context all have the same
00042 * GL visual.
00043 * However, display lists may be shared between different GL contexts.
00044 */
00045 class FXAPI FXGLContext : public FXId {
00046   FXDECLARE(FXGLContext)
00047 private:
00048   FXGLVisual     *visual;     // Visual for this context
00049   FXDrawable     *surface;    // Drawable context is locked on
00050   FXGLContext    *sgnext;     // Share group next in share list
00051   FXGLContext    *sgprev;     // Share group previous in share list
00052 protected:
00053   void           *ctx;        // GL Context
00054 protected:
00055   FXGLContext():visual(NULL),surface(NULL),sgnext(NULL),sgprev(NULL),ctx(NULL){}
00056 private:
00057   FXGLContext(const FXGLContext&);
00058   FXGLContext &operator=(const FXGLContext&);
00059 public:
00060 
00061   /**
00062   * Construct an OpenGL context with its own private display list.
00063   */
00064   FXGLContext(FXApp* a,FXGLVisual *vis);
00065 
00066   /**
00067   * Construct an OpenGL context sharing display lists with an existing GL context.
00068   */
00069   FXGLContext(FXApp* a,FXGLVisual *vis,FXGLContext *shared);
00070 
00071   /// Return TRUE if it is sharing display lists
00072   FXbool isShared() const;
00073 
00074   /// Get the visual
00075   FXGLVisual* getVisual() const { return visual; }
00076 
00077   /// Create context
00078   virtual void create();
00079 
00080   /// Detach the server-side resources for this window
00081   virtual void detach();
00082 
00083   /// Destroy the server-side resources for this window
00084   virtual void destroy();
00085 
00086   /// Make OpenGL context current prior to performing OpenGL commands
00087   FXbool begin(FXDrawable *drawable);
00088 
00089   /// Make OpenGL context non current
00090   FXbool end();
00091 
00092   /// Swap front and back buffer
00093   void swapBuffers();
00094 
00095   /// Copy part of backbuffer to front buffer [Mesa]
00096   void swapSubBuffers(FXint x,FXint y,FXint w,FXint h);
00097 
00098   /// Save object to stream
00099   virtual void save(FXStream& store) const;
00100 
00101   /// Load object from stream
00102   virtual void load(FXStream& store);
00103 
00104   /// Destructor
00105   virtual ~FXGLContext();
00106   };
00107 
00108 
00109 #endif
00110