// @(#)root/x11:$Name:  $:$Id: TX11GL.h,v 1.13 2006/06/06 11:49:01 couet Exp $
// Author: Timur Pocheptsov 09/08/2004

/*************************************************************************
 * Copyright (C) 1995-2004, Rene Brun and Fons Rademakers.               *
 * All rights reserved.                                                  *
 *                                                                       *
 * For the licensing terms see $ROOTSYS/LICENSE.                         *
 * For the list of contributors see $ROOTSYS/README/CREDITS.             *
 *************************************************************************/

#ifndef ROOT_TX11GL
#define ROOT_TX11GL


//////////////////////////////////////////////////////////////////////////
//                                                                      //
// TX11GL                                                               //
//                                                                      //
// The TX11GL is X11 implementation of TVirtualGLImp class.             //
//                                                                      //
//////////////////////////////////////////////////////////////////////////

#ifndef ROOT_TVirtualGL
#include "TVirtualGL.h"
#endif

#if !defined(__CINT__)
#include <GL/glx.h>
#else
struct Display;
struct XVisualInfo;
#endif


class TX11GL : public TVirtualGLImp {

private:
   Display     *fDpy;
   XVisualInfo *fVisInfo;

public:
   TX11GL();

   Window_t CreateGLWindow(Window_t wind);
   ULong_t  CreateContext(Window_t wind);
   void     DeleteContext(ULong_t ctx);
   void     MakeCurrent(Window_t wind, ULong_t ctx);
   void     SwapBuffers(Window_t wind);

   ClassDef(TX11GL, 0); //X11 implementation
};

class TX11GLManager : public TGLManager {
private:
   class TX11GLImpl;
   TX11GLImpl *fPimpl;
   
public:
   TX11GLManager();
   ~TX11GLManager();
   
   //All public functions are TGLManager's final-overriders

   //index returned can be used as a result of gVirtualX->InitWindow
   Int_t    InitGLWindow(Window_t winID);
   //winInd is the index, returned by InitGLWindow
   Int_t    CreateGLContext(Int_t winInd);

   //[            Off-screen rendering part
   //create pixmap to read GL buffer into it, 
   //ctxInd is the index, returned by CreateGLContext
   Bool_t   AttachOffScreenDevice(Int_t ctxInd, Int_t x, Int_t y, UInt_t w, UInt_t h);
   Bool_t   ResizeOffScreenDevice(Int_t devInd, Int_t x, Int_t y, UInt_t w, UInt_t h);
   //analog of gVirtualX->SelectWindow(fPixmapID) => gVirtualGL->SelectOffScreenDevice(fPixmapID)
   void     SelectOffScreenDevice(Int_t devInd);
   //Index of pixmap, valid for gVirtualX
   Int_t    GetVirtualXInd(Int_t devInd);
   //copy pixmap into window directly/by pad
   void     MarkForDirectCopy(Int_t devInd, Bool_t);
   //Off-screen device holds sizes for glViewport
   void     ExtractViewport(Int_t devInd, Int_t *vp);
   //Read GL buffer into pixmap
   void     ReadGLBuffer(Int_t devInd);
   //]            

   //Make the gl context current
   Bool_t   MakeCurrent(Int_t devInd);
   //Sswap buffers or copies pixmap (XCopyArea)
   void     Flush(Int_t ctxInd);
   //Generic function for gl context and off-screen device deletion
   void     DeleteGLContext(Int_t devInd);

   //used by viewer
   void     DrawViewer(TVirtualViewer3D *vv);
   //
   Bool_t   SelectViewer(TVirtualViewer3D *viewer, const TGLRect *selRect);
   Bool_t   SelectManip(TVirtualGLManip *manip, const TGLCamera *camera, const TGLRect *rect, const TGLBoundingBox *sceneBox);
   TObject *Select(TVirtualGLPainter *painter, Int_t px, Int_t py);
   //
   void     PaintSingleObject(TVirtualGLPainter *);
   void     PanObject(TVirtualGLPainter *o, Int_t x, Int_t y);
   void     PrintViewer(TVirtualViewer3D *vv);

   struct TGLContext_t;
   
private:
   Bool_t CreateGLPixmap(TGLContext_t &);
   
   //implicit copy-ctor/assignment generation
   // was already disabled by base class, but to be explicit ...
   TX11GLManager(const TX11GLManager &);
   TX11GLManager &operator = (const TX11GLManager &);

   ClassDef(TX11GLManager, 0) //X11-specific version of TGLManager
};


#endif
