OSGWindow.cpp

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/*---------------------------------------------------------------------------*\
 *                                OpenSG                                     *
 *                                                                           *
 *                                                                           *
 *             Copyright (C) 2000-2002 by the OpenSG Forum                   *
 *                                                                           *
 *                            www.opensg.org                                 *
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 *   contact: dirk@opensg.org, gerrit.voss@vossg.org, jbehr@zgdv.de          *
 *                                                                           *
\*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*\
 *                                License                                    *
 *                                                                           *
 * This library is free software; you can redistribute it and/or modify it   *
 * under the terms of the GNU Library General Public License as published    *
 * by the Free Software Foundation, version 2.                               *
 *                                                                           *
 * 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         *
 * Library General Public License for more details.                          *
 *                                                                           *
 * You should have received a copy of the GNU Library General Public         *
 * License along with this library; if not, write to the Free Software       *
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.                 *
 *                                                                           *
\*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*\
 *                                Changes                                    *
 *                                                                           *
 *                                                                           *
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\*---------------------------------------------------------------------------*/

//---------------------------------------------------------------------------
//  Includes
//---------------------------------------------------------------------------

#include <stdlib.h>
#include <stdio.h>

#include "OSGConfig.h"

#include <OSGBase.h>
#include <OSGGL.h>

#if !defined(WIN32) && !defined(darwin)
#include <GL/glx.h>
#endif

#if defined(__sgi) || defined(__hpux) || defined(__linux)
#include <dlfcn.h>
#endif

#if defined(darwin)
#include <mach-o/dyld.h>
#endif

#if defined(__sun)
#include <dlfcn.h>
#include <link.h>
#endif

#include <OSGBaseFunctions.h>
#include <OSGDrawAction.h>
#include <OSGRenderActionBase.h>
#include "OSGViewport.h"

#include "OSGBackground.h"
#include "OSGCamera.h"
#include "OSGWindow.h"

OSG_USING_NAMESPACE

#if defined(OSG_WIN32_ICL) && !defined(OSG_CHECK_FIELDSETARG)
#pragma warning (disable)
#endif

/***************************************************************************\
 *                            Description                                  *
\***************************************************************************/

// Window-sytem specific virtual functions

// only needed in dev docs

#if !defined(OSG_DO_DOC) || defined(OSG_DOC_DEV)

#endif

/***************************************************************************\
 *                           Class variables                               *
\***************************************************************************/

std::vector<WindowPtr              >  OSG::Window::_allWindows;
UInt32                                OSG::Window::_currentWindowId = 0;
// GLobject handling

Lock                                 *OSG::Window::_GLObjectLock;

Lock                                 *OSG::Window::_staticWindowLock;

std::vector<OSG::Window::GLObject *>  OSG::Window::_glObjects; 

//std::list<std::pair<UInt32,UInt32> >  OSG::Window::_glObjectDestroyList;

// GL extension handling

// The name of the dynamic library for OpenGL extension functions
// By default it's NULL, which tries to find them in the current 
// executable
const Char8 *OSG::Window::_glLibraryName = NULL;    

std::vector<std::string            >  OSG::Window::_registeredExtensions;
std::vector<std::string            >  OSG::Window::_ignoredExtensions;
std::vector<bool                   >  OSG::Window::_commonExtensions;
std::vector<std::string            >  OSG::Window::_registeredFunctions;
std::vector<Int32                  >  OSG::Window::_registeredFunctionExts;

// GL constant handling

std::vector<GLenum                 >  OSG::Window::_registeredConstants;


// Just a constant to indicate that the GL constant is unknown
const Real32 OSG::Window::unknownConstant = -1e100;    

/***************************************************************************\
 *                           Class methods                                 *
\***************************************************************************/

/*-------------------------------------------------------------------------*\
 -  private                                                                -
\*-------------------------------------------------------------------------*/

void OSG::Window::initMethod (void)
{
}

/***************************************************************************\
 *                           Instance methods                              *
\***************************************************************************/

/*-------------------------------------------------------------------------*\
 -  protected                                                              -
\*-------------------------------------------------------------------------*/


/*------------- constructors & destructors --------------------------------*/

OSG::Window::Window(void) :
     Inherited( ),
    _windowId (0)
{
    // only called for prototypes, no need to init them
}

OSG::Window::Window(const Window &source) :
    Inherited(source),
    _glObjectDestroyList(source._glObjectDestroyList),
    _lastValidate(source._lastValidate.size(),0),
    _ids(source._ids.size(),0),
    _extensions(),
    _availExtensions(),
    _extFunctions(),
    _availConstants(),
    _numAvailConstants(0),
    _windowId(0)
{       
    // mark all GL objects as not yet initialized
    doInitRegisterGLObject(1, _glObjects.size() - 1);
}

OSG::Window::~Window(void)
{
    // delete the ports and the context
}


/*-------------------------------------------------------------------------*\
 -  private                                                                -
\*-------------------------------------------------------------------------*/

void OSG::Window::onCreate(const Window *)
{
    // Don't add the prototype instances to the list
    if(GlobalSystemState != Running)
        return;
        
    _allWindows.push_back(WindowPtr(this)); 

    _windowId = ++_currentWindowId;
}

void OSG::Window::onCreateAspect(const Window *, const Window *)
{
    // Don't add the prototype instances to the list
    if(GlobalSystemState != Running)
        return;

    _windowId = _currentWindowId;
}

void OSG::Window::onDestroy(void)
{
    // decrement GLObjects reference counter.
    for(UInt32 i = 1; i < _glObjects.size(); ++i)
    {
        GLObject *obj = _glObjects[i];
        if(obj == NULL)
        {
            FDEBUG(("Window::onDestroy: object %u already destroyed!\n", i));
            continue;
        }
        // has the object been used in this context at all?
        if(i < getGlObjectLastReinitialize().size() && getGlObjectLastReinitialize()[i] != 0)
        {
            obj->decRefCounter();
            // we can't call here the destroy callbacks because the
            // gl context is not guaranteed to be current, but destroying
            // the context should delete all gl objects.
        }
    }

    std::vector<WindowPtr>::iterator it;
    it = std::find(_allWindows.begin(), _allWindows.end(), WindowPtr(this));
    
    // prototype window are not added to the list, so they might not be found.
    if(it != _allWindows.end()) 
        _allWindows.erase( it );
}

void OSG::Window::staticAcquire(void)
{
    // Is the ThreadManager initialized yet?
    if(GlobalSystemState != Running)
        return;
        
    if(_staticWindowLock == NULL)
    {
        _staticWindowLock = ThreadManager::the()->getLock(NULL);
    }
    _staticWindowLock->aquire();
}

void OSG::Window::staticRelease(void)
{
    // Is the ThreadManager initialized yet?
    if(GlobalSystemState != Running)
        return;
        
    _staticWindowLock->release();
}

/*-------------------------------------------------------------------------*\
 -  public                                                                 -
\*-------------------------------------------------------------------------*/

void OSG::Window::changed(BitVector whichField, UInt32 origin)
{
    Inherited::changed(whichField, origin);
}

/*------------------------------ access -----------------------------------*/

void OSG::Window::addPort(const ViewportPtr &portP)
{
    if(portP != NullFC)
    {
        _mfPort.push_back(portP);
// CHECK CHECK
//        _mfPort.back()->setParent(FieldContainer::getPtr<WindowPtr>(*this));

        beginEditCP(portP, Viewport::ParentFieldMask);
        {
            _mfPort.back()->setParent(WindowPtr(*this));
        }
        endEditCP  (portP, Viewport::ParentFieldMask);
    }
}

void OSG::Window::insertPort(UInt32 portIndex, const ViewportPtr &portP)
{    
    MFViewportPtr::iterator portIt = _mfPort.begin();

    if(portP != NullFC)
    {
        portIt += portIndex;
  
// CHECK CHECK      
//        (*(_mfPort.insert(portIt, portP)))->setParent(
//            FieldContainer::getPtr<WindowPtr>(*this));

        beginEditCP(portP, Viewport::ParentFieldMask);
        {
            (*(_mfPort.insert(portIt, portP)))->setParent(
                WindowPtr(*this));
        }
        endEditCP  (portP, Viewport::ParentFieldMask);

    }
}


void OSG::Window::replacePort(UInt32 portIndex, const ViewportPtr &portP)
{
    if(portP != NullFC)
    {
        _mfPort[portIndex]->setParent(NullFC);
        _mfPort[portIndex] = portP;
// CHECK CHECK
//        _mfPort.getValue(portIndex)->setParent(
//            FieldContainer::getPtr<WindowPtr>(*this));
        _mfPort[portIndex]->setParent(
            WindowPtr(*this));
    }
}

void OSG::Window::replacePortBy(const ViewportPtr &portP, 
                             const ViewportPtr &newportP)
{
    MFViewportPtr::iterator portIt = _mfPort.find(portP);

    if(newportP != NullFC)
    {
        if(portIt != _mfPort.end())
        {
            (*portIt)->setParent(NullFC);
            (*portIt) = newportP;
// CHECK CHECK
//            (*portIt)->setParent(
//                FieldContainer::getPtr<WindowPtr>(*this));
            (*portIt)->setParent(
                WindowPtr(*this));
        }
    }
}

void OSG::Window::subPort(const ViewportPtr &portP)
{
    MFViewportPtr::iterator portIt = _mfPort.find(portP);

    if(portIt != _mfPort.end())
    {
        (*portIt)->setParent(NullFC);

        _mfPort.erase(portIt);
    }

}

void OSG::Window::subPort(UInt32  portIndex)
{
    MFViewportPtr::iterator portIt = _mfPort.begin();

    portIt += portIndex;

    if(portIt != _mfPort.end())
    {
        (*portIt)->setParent(NullFC);

        _mfPort.erase(portIt);
    }
}


#if !defined(OSG_DO_DOC) || defined(OSG_DOC_EXT)

/*------------------------ GL object handling -----------------------------*/

UInt32 OSG::Window::registerGLObject(GLObjectFunctor functor, UInt32 num)
{
    UInt32    id, i; 
    GLObject *pGLObject;

    staticAcquire();
    
    // reserve index 0, illegal for most OpenGL functions
    if(_glObjects.empty())
        _glObjects.push_back( NULL );   

    id        = _glObjects.size();
    pGLObject = new GLObject(functor);
    
    // does the requested block fit into the capacity?
    
    if(_glObjects.capacity() >= id + num)
    {
        _glObjects.insert(_glObjects.end(), num, pGLObject );
        
        initRegisterGLObject(id, num);

        staticRelease();
       
        return id;
    }
    
    // doesn't fit, try to find a block in the middle
    
    UInt32 cnt = 0;        

    // start searching at 1, id 0 is reserved for GL
    for(i = 1; i < _glObjects.size(); ++i)
    {       
        if(!_glObjects[i]) 
        {
            if(cnt == 0)
            {
                id = i;
            }

            ++cnt;

            if(cnt == num) 
            {
                // block of unused entries found ...
                        
                while(i >= id) 
                {
                    _glObjects[i] = pGLObject;
                    i = i - 1;
                } 
                
                initRegisterGLObject(id, num);

                staticRelease();
                   
                return id;
            }
        }
        else
        {
            cnt = 0;
        }
    }
    
    // no block found, add at the end
    
    // fill the empty slots at the end 
    i = id + cnt - 1;
    while ( i >= id )
    {
        _glObjects[i] = pGLObject;
        i = i - 1;
    }
    
    // expand the vector for the rest 
    for ( i = 1; i <= num - cnt; i++ ) 
    {       
        _glObjects.push_back( pGLObject );
    }
                
    initRegisterGLObject(id, num);
    
    staticRelease();
    
    return id;
}

void OSG::Window::validateGLObject(UInt32 id)
{
    if ( id == 0 )
    {
        SWARNING << "Window::validateGLObject: id is 0!" << std::endl;
            return;
    }
    
    GLObject *obj = _glObjects[id];
    
    if(obj == NULL)
    {
        SWARNING << "Window::validateGLObject: obj is NULL!" << std::endl;
        return;
    }

    if(id >= _lastValidate.size()) // can happen if multi-threading
    {
        _lastValidate.insert(_lastValidate.end(), 
                             id + 1 - _lastValidate.size(),
                             0);
    }
    
    FDEBUG(("Window 0x%p (event %d,ri:%d,rf:%d): "
            "Validating object %d: last reinit:%d, last validate:"
            "%d last refresh: %d => %s\n", 
            this, getGlObjectEventCounter(), 
            _mfGlObjectLastReinitialize.size(),
            _mfGlObjectLastRefresh.size(),
            id, 
            (_mfGlObjectLastReinitialize.size() > id)?
                _mfGlObjectLastReinitialize[id]:0xffffffff,
            _lastValidate[id],
            (_mfGlObjectLastRefresh.size() > id)?
                _mfGlObjectLastRefresh[id]:0xffffffff,
            (_mfGlObjectLastReinitialize[id] == 0)?"init":
            ((_mfGlObjectLastReinitialize[id] > _lastValidate[id])?"reinit":
            ((_mfGlObjectLastRefresh[id] > _lastValidate[id])?"refresh":
            "up-to-date"))
          ));
    
    if(_mfGlObjectLastReinitialize[id] == 0)
    {
        obj->incRefCounter();
        obj->getFunctor().call(this, packIdStatus(id, initialize));
        _mfGlObjectLastReinitialize[id] = 1;
        _lastValidate[id] = getGlObjectEventCounter();
    }
    else if(_mfGlObjectLastReinitialize[id] > _lastValidate[id])
    {
        obj->getFunctor().call(this, packIdStatus(id, reinitialize));
        _lastValidate[id] = getGlObjectEventCounter();
    }
    else if(_mfGlObjectLastRefresh[id] > _lastValidate[id])
    {
        obj->getFunctor().call(this, packIdStatus(id, needrefresh));
        _lastValidate[id] = getGlObjectEventCounter();
    }
}


void OSG::Window::validateAllGLObjects(void)
{
    activate();
    frameInit();

    for (UInt32 i = 1; i < _glObjects.size(); ++i)
        validateGLObject(i);
    
    frameExit();
}   

void OSG::Window::refreshGLObject( UInt32 id )
{
    if ( id == 0 )
    {
        SWARNING << "Window::refreshGLObject: id is 0!" << std::endl;
        return;
    }

    std::vector<WindowPtr>::iterator it;

    for ( it = _allWindows.begin(); it != _allWindows.end(); ++it)
    {
        beginEditCP(*it, GlObjectEventCounterFieldMask|
                         GlObjectLastRefreshFieldMask);

        UInt32 lastinv = (*it)->getGlObjectEventCounter() + 1;
        MFUInt32 &field = (*it)->_mfGlObjectLastRefresh;
        if(field.size() <= id)
            field.getValues().insert(field.end(), id - field.size() + 1, 0 );
        field[id] = lastinv;
        (*it)->setGlObjectEventCounter(lastinv);

        endEditCP  (*it, GlObjectEventCounterFieldMask|
                         GlObjectLastRefreshFieldMask);
    }
}

void OSG::Window::reinitializeGLObject(UInt32 id)
{
    if ( id == 0 )
    {
        SWARNING << "Window::reinitializeGLObject: id is 0!" << std::endl;
        return;
    }

    std::vector<WindowPtr>::iterator it;

    for(it = _allWindows.begin(); it != _allWindows.end(); ++it)
    {
        beginEditCP(*it, GlObjectEventCounterFieldMask|
                         GlObjectLastReinitializeFieldMask);

        UInt32 lastinv = (*it)->getGlObjectEventCounter() + 1;

        MFUInt32 &field = (*it)->_mfGlObjectLastReinitialize;
        if(field.size() < id)
            field.getValues().insert(field.end(), id - field.size() + 1, 0 );
        // is it already validated?
        if(field[id] == 0)
            continue;
        field[id] = lastinv;
        (*it)->setGlObjectEventCounter(lastinv);

        endEditCP  (*it, GlObjectEventCounterFieldMask|
                         GlObjectLastReinitializeFieldMask);
    }
}

void OSG::Window::initRegisterGLObject(UInt32 id, UInt32 num)
{
    if ( id == 0 )
    {
        SWARNING << "Window::initRegisterGLObject: id is 0!" << std::endl;
        return;
    }

    std::vector<WindowPtr>::iterator it;

    for(it = _allWindows.begin(); it != _allWindows.end(); ++it)
    {
        (*it)->doInitRegisterGLObject(id, num);
    }
}

void OSG::Window::doInitRegisterGLObject(UInt32 id, UInt32 num)
{
    WindowPtr win(this);
    
    beginEditCP(win, GlObjectLastReinitializeFieldMask|
                     GlObjectLastRefreshFieldMask);

    if(_mfGlObjectLastReinitialize.size() < id + num)
    {
        _mfGlObjectLastReinitialize.resize(id + num);
        _mfGlObjectLastRefresh.resize(id + num);
        _lastValidate.resize(id + num);
    }

    for(UInt32 i = id; i < id + num; ++i)
    {
        _mfGlObjectLastReinitialize[i] = 0;
        _mfGlObjectLastRefresh     [i] = 0;
        _lastValidate[i] = 0;
   }

    endEditCP  (win, GlObjectLastReinitializeFieldMask|
                     GlObjectLastRefreshFieldMask);
}

void OSG::Window::destroyGLObject(UInt32 id, UInt32 num)
{
    std::vector<WindowPtr>::iterator it;

    for(it = _allWindows.begin(); it != _allWindows.end(); ++it)
    {
#ifdef OSG_DEBUG
        if(id + num > (*it)->_mfGlObjectLastReinitialize.size())
        {
            FWARNING(("Window::destroyGLObject:: id %d + num %d exceed"
                "registered objects size %d!\n", id, num, 
                (*it)->_mfGlObjectLastReinitialize.size()));
            return;
        }
#endif
        // has the object been used in this context at all?
        if((*it)->getGlObjectLastReinitialize()[id] != 0) 
            (*it)->_glObjectDestroyList.push_back(DestroyEntry(id,num));
    }
}


/*----------------------- GL extension handling ---------------------------*/


UInt32 OSG::Window::registerExtension(const Char8 *s)
{
    FDEBUG(("Window::registerExtension: register '%s': ", s));
    staticAcquire();
   
    if(s == NULL)
    {
        staticRelease();
        return TypeTraits<UInt32>::getMax();
    }
    
    std::vector<std::string>::iterator i;
    
    i = std::find(_registeredExtensions.begin(), _registeredExtensions.end(), 
                  s);
    
    if(i < _registeredExtensions.end())
    {
        staticRelease();
        FPDEBUG(("reusing id %d\n", i - _registeredExtensions.begin()));
        return i - _registeredExtensions.begin();
    }
        
    UInt32 r = _registeredExtensions.size();
    _registeredExtensions.push_back(s);
    
    FPDEBUG(("new id %d\n", r));
    
    staticRelease();
    return r;
}

bool OSG::Window::hasExtension(const Char8 *s)
{
    if(std::find(_ignoredExtensions.begin(),
                 _ignoredExtensions.end(),
                 s)                         != _ignoredExtensions.end())
    {
        return false;
    }
    
    if(std::find(_extensions.begin(),
                 _extensions.end(),
                 s)                         != _extensions.end())
    {
        return true;
    }
    
    return false;
}

void OSG::Window::ignoreExtensions(const Char8 *s)
{    
    FDEBUG(("Window:: Ignoring extensions '%s'\n", s));

    staticAcquire();
    
    std::back_insert_iterator< std::vector<std::string> > 
            extension_back_inserter(_ignoredExtensions);

    std::string toex(s);
    
    for(string_token_iterator ignit = string_token_iterator(toex, ",. ");
        ignit != string_token_iterator(); ++ignit)
    {          
        std::string ignore = *ignit;

        FDEBUG(("Ignoring '%s':", ignore.c_str()));
        
        if(std::find(_ignoredExtensions.begin(),
                     _ignoredExtensions.end(),
                     ignore.c_str())            != _ignoredExtensions.end())
        {
            FPDEBUG((" already ignored.\n"));
            continue;
        }
        
        _ignoredExtensions.push_back(ignore);
        
        std::vector<std::string>::iterator regit;
        
        // if extension is registered, disable it on all existing Windows
        
        regit = std::find(_registeredExtensions.begin(),
                          _registeredExtensions.end(),
                          ignore.c_str());                                 
        
        Int32 ind = -1;
        
        if(regit != _registeredExtensions.end())
        {
            ind = regit - _registeredExtensions.begin();
            FPDEBUG(("(reg as %d)", ind));
        }

        // Walk all existing windows and remove the ignored extension 
        // from the _extensions vector. Disable it if it was a registered one.
        
        std::vector<WindowPtr>::iterator winit;

        for(winit = _allWindows.begin(); winit != _allWindows.end(); ++winit)
        {
            FPDEBUG((" %p:", (*winit).getCPtr()));
            
            std::vector<std::string>::iterator extit;
            
            extit = std::find((*winit)->_extensions.begin(),
                              (*winit)->_extensions.end(),
                              ignore.c_str()); 
                                                                     
            if(extit != (*winit)->_extensions.end())
            {
                FPDEBUG((" removed"));
                (*winit)->_extensions.erase(extit);
            }
            else
            {
                FPDEBUG((" nonsupp"));            
            }
                        
            if(ind >= 0)
            {
                if((*winit)->_availExtensions.size() > UInt32(ind))
                {
                    (*winit)->_availExtensions[ind] = false;
                    FPDEBUG((" disabled"));            
                }
                if((*winit)->_commonExtensions.size() > UInt32(ind))
                {
                    (*winit)->_commonExtensions[ind] = false;
                    FPDEBUG((" uncommoned"));            
                }
            }
        }
        FPDEBUG(("\n"));    
    }

    std::sort(_ignoredExtensions.begin(), _ignoredExtensions.end());
    
    staticRelease();
}

UInt32 OSG::Window::registerFunction(const Char8 *s, Int32 ext)
{
    if(s == NULL)
        return TypeTraits<UInt32>::getMax();

    FDEBUG(("Window::registerFunction: register '%s': ", s));

    staticAcquire();
    
    std::vector<std::string>::iterator i;
    
    i = std::find(_registeredFunctions.begin(), _registeredFunctions.end(), 
                  s);
    
    if(i < _registeredFunctions.end())
    {
        staticRelease();
        FPDEBUG(("reusing id %d\n", i - _registeredFunctions.begin()));
        return i - _registeredFunctions.begin();
    }
            
    UInt32 r=_registeredFunctions.size();
    _registeredFunctions.push_back(s);
    _registeredFunctionExts.push_back(ext);

    FPDEBUG(("new id %d\n", r));
    
    staticRelease();
    return r;
}

void OSG::Window::registerConstant(GLenum val)
{
    staticAcquire();
   
    _registeredConstants.push_back(val);
    
    staticRelease();
}

#endif // remove the OpenGL object handling from user docs

void OSG::Window::dumpExtensions(void)
{   
    std::vector<std::string>::iterator it;
    std::cout << "GL Extensions: ";
    for ( it = _extensions.begin(); it != _extensions.end(); it++ )
    {
        std::cout << it->c_str() << ", ";
    }
    std::cout << std::endl;       
}


void OSG::Window::frameInit(void)
{
    static bool ignoreEnvDone = false;
    
    if(!ignoreEnvDone)
    {
        ignoreEnvDone = true;
        char *p = getenv("OSG_IGNORE_EXTENSIONS");
        if(p)
            ignoreExtensions(p);
    }
    
    // get extensions and split them
    if(_extensions.empty())
    {
        FDEBUG(("Window %p: GL Extensions: %s\n", this, 
                glGetString(GL_EXTENSIONS) ));

        std::string foo(reinterpret_cast<const char*>
                        (glGetString(GL_EXTENSIONS)));

        for(string_token_iterator it = string_token_iterator(foo, ",. ");
            it != string_token_iterator(); ++it)
        {          
            if(! std::binary_search(_ignoredExtensions.begin(),
                                    _ignoredExtensions.end(),
                                    *it))
            {
                _extensions.push_back(*it);
            }
        }
        std::sort(_extensions.begin(), _extensions.end());
                 
        // if we don't have any extensions, add something anyway
        if(_extensions.empty())
            _availExtensions.resize(_registeredExtensions.size(), false);
    }
    
    // any new extension registered ? 
    if(_registeredExtensions.size() > _availExtensions.size())
    {
        staticAcquire();
        FDEBUG(("Window %p: exts: ", this));

        while(_registeredExtensions.size() > _availExtensions.size())
        {                          
            UInt32 s = _availExtensions.size();

            /* perform a binary search over the retrieved extension strings.
               Push back the result as an availability flag for the extension
               requested by the application */         
            bool supported = std::binary_search( 
                                _extensions.begin(),
                                _extensions.end(),
                                _registeredExtensions[s]);

            _availExtensions.push_back(supported);
            FPDEBUG(("%s:", _registeredExtensions[s].c_str()));
            if(_commonExtensions.size() <= s)
            {
                _commonExtensions.push_back(supported);
                FPDEBUG(("ok "));
            }
            else if (!supported)
            {
                _commonExtensions[s] = false;
                FPDEBUG(("NF "));
            }
        }
        FPDEBUG(("\n"));
        staticRelease();
    }
    
    // any new functions registered ? 
    while(_registeredFunctions.size() > _extFunctions.size())
    {   
        const Char8 *s    = _registeredFunctions[_extFunctions.size()].c_str();
        Int32        ext  = _registeredFunctionExts[_extFunctions.size()];
        void        *func = NULL;
        
        if(ext == -1 || _availExtensions[ext] == true)
            func = (void*)getFunctionByName(s);

        _extFunctions.push_back(func);
    }

    // any new constants registered ? 
    while(_registeredConstants.size() > _numAvailConstants)
    {   
        for(std::vector<GLenum>::iterator it = _registeredConstants.begin() + 
                                               _numAvailConstants;
            it != _registeredConstants.end();
            ++it)
        {
            Vec2f val(unknownConstant, unknownConstant); 
            glGetFloatv(*it, static_cast<GLfloat*>(val.getValues()));
            _availConstants[*it] = val;
            FDEBUG(("Window(%p): Constant 0x%x value is %.3f %.3f\n", this,
                    *it, val[0], val[1]));
        }
        _numAvailConstants = _registeredConstants.size();
        glGetError(); // clear the error flag 
    }
}

void OSG::Window::frameExit(void)
{   
    std::list<DestroyEntry>::iterator st,en;

    st = _glObjectDestroyList.begin();
    en = _glObjectDestroyList.end  ();

    while(st != en)
    {
        UInt32 i = st->first, n = st->second;

        GLObject *obj = _glObjects[ i ];
        
        if(obj == NULL)
        {
            FDEBUG(("Window::frameExit: objects %d (%d) already destroyed?!?\n",
                    i, n));
            ++st;
            continue;
        }
           
        UInt32 rc = obj->getRefCounter();

        // has the object been used in this context at all?
        if(getGlObjectLastReinitialize()[i] != 0) 
        {                  
            _glObjects[i]->getFunctor().call( this, packIdStatus(i, destroy));

            if((rc = _glObjects[ i ]->decRefCounter()) <= 0)
            {           
                // call functor with the final-flag
                _glObjects[i]->getFunctor().call( this, 
                                                packIdStatus(i, finaldestroy));
            }
        }

        // if the GLObject is removed from each GL-Context, free GLObject-IDs.
        if(rc <= 0)
        {
            delete _glObjects[ i ];
            for ( UInt32 j = 0; j < n ; j++)
            {
                _glObjects[i+j] = NULL;
            }   
        }
        ++st;
    }

    _glObjectDestroyList.clear();
    
    // Test for OpenGL errors. Just a little precaution to catch
    // stray errors. This is the only OpenGL error test in opt mode
 
    GLenum glerr;

    while((glerr = glGetError()) != GL_NO_ERROR)
    {
        FWARNING(("Window::frameExit: Caught stray OpenGL error %s (%#x).\n",
                gluErrorString(glerr),
                glerr));
#ifndef OSG_DEBUG
        FWARNING(("Rerun with debug-libraries to get more accurate "
                  "information.\n"));
#endif
    }
    
}


// Query for a GL extension function
// Yes, this is system dependent, but the system dependent parts are 
// #ifdefed anyway, and very similar code would show up in a number of places,
// making maintaining it unnecessarily hard
// Note: the order of the cases is important, do not change it!

OSG::Window::GLExtensionFunction OSG::Window::getFunctionByName(
    const Char8 *s)
{
    GLExtensionFunction retval = NULL;

#if defined(darwin)

    if (NSIsSymbolNameDefined(s))
    {
        NSSymbol symbol = NSLookupAndBindSymbol(s);
        if (symbol != 0)
            retval = GLExtensionFunction(NSAddressOfSymbol(symbol));
    }

#elif defined(WIN32)

    retval = (void(__cdecl*)(void)) wglGetProcAddress(s);
    
#elif defined(__sgi)   || defined(darwin) || defined(__hpux) || \
      defined(__linux) || defined(__sun)

    /* Workaround for multiple nVidia/Linux installation bugs, based on code by */
    /* Manfred Weiler (Patch 783637) */
    
    static void (*(*__GetProcAddress)(const GLubyte *))(void) = NULL; 

    static void *libHandle = NULL; 

    if(libHandle == NULL) 
    { 
        libHandle = dlopen(_glLibraryName, RTLD_NOW | RTLD_LOCAL); 

        if(!libHandle) 
        { 
            FWARNING(("Error in dlopen: %s\n",dlerror())); 
            abort(); 
        } 
        else
        {
            FDEBUG(("Opened lib %s for GL extension handling.\n", 
                    (_glLibraryName==NULL)?"(executable)":_glLibraryName));
        }
    } 

    if(__GetProcAddress == NULL) 
    { 
        __GetProcAddress = (void (*(*)(const GLubyte*))()) dlsym(libHandle, "glXGetProcAddressARB"); 

        if(__GetProcAddress == NULL) 
        { 
            __GetProcAddress = (void (*(*)(const GLubyte*))()) dlsym(libHandle, "glXGetProcAddress"); 
            
            if(__GetProcAddress == NULL) 
            {
                FWARNING(("Neither glXGetProcAddress nor "
                        "glXGetProcAddressARB found! Disabling all "
                        " extensions for Window %p!")); 
                _availExtensions.clear();
                _availExtensions.resize(_registeredExtensions.size(), false);
            } 
            else
            {
                FDEBUG(("Using glXGetProcAddress for GL extension handling.\n"));
            }
        } 
        else
        {
            FDEBUG(("Using glXGetProcAddressARB for GL extension handling.\n"));
        }
    } 

    if(__GetProcAddress != NULL) 
    { 
        retval = reinterpret_cast<GLExtensionFunction>(__GetProcAddress((const GLubyte*)s)); 
    } 
    else 
    { 
        retval = (GLExtensionFunction)(dlsym(libHandle, s)); 
    } 

#else

    FWARNING(("Window::getFunctionByName: couldn't find implementation!\n"
              "Please contact the developers at info@opensg.org.\n"));
    retval = NULL;

#endif

    if(retval == NULL)
    {
        FWARNING(("Window::getFunctionByName: Couldn't get function '%s' for "
                 "Window %p.\n", s, this));
    }
    else
    {
        FDEBUG(("Window::getFunctionByName: got function '%s' for "
                 "Window %p at %p.\n", s, this, retval));
    }

    return retval;
}


const Vec2f& OSG::Window::getConstantValuev(GLenum id)
{
    static Vec2f inf(Inf, Inf);

    ConstHash::iterator it = _availConstants.find(id);

    if(it != _availConstants.end())
        return _availConstants[id];

    return inf;
}


void OSG::Window::setupGL( void )
{   
    glPixelStorei( GL_UNPACK_ALIGNMENT, 1 );
    glPixelStorei( GL_PACK_ALIGNMENT, 1 );
    
    glDepthFunc( GL_LEQUAL );
    glEnable( GL_DEPTH_TEST );
    
    glEnable( GL_NORMALIZE );
    
    // switch off default light
    GLfloat nul[4]={0,0,0,0};
    glLightfv(GL_LIGHT0, GL_DIFFUSE, nul);
    glLightfv(GL_LIGHT0, GL_SPECULAR, nul);
    
    frameInit();    // call it to setup extensions
}

/*-------------------------- your_category---------------------------------*/

void OSG::Window::draw(DrawAction * action)
{
    activate();
    frameInit();    // query recently registered GL extensions
    
    resizeGL();

    drawAllViewports(action);

    swap();
    frameExit();    // after frame cleanup: delete GL objects, if needed
}

void OSG::Window::drawAllViewports(DrawAction * action)
{
    MFViewportPtr::iterator       portIt  = _mfPort.begin();
    MFViewportPtr::const_iterator portEnd = _mfPort.end();

    if(action != NULL)
    {
        action->setWindow(this);
        
        while(portIt != portEnd)
        {
            (*portIt)->draw(action);

            ++portIt;
        }
    }
    else
    {
        SWARNING << "Window::drawAllViewports: no action!" << std::endl;
    }
}
    
void OSG::Window::render(RenderActionBase *action)
{
    activate();
    frameInit();    // query recently registered GL extensions
    
//  resizeGL();

    renderAllViewports(action);

    swap();
    frameExit();    // after frame cleanup: delete GL objects, if needed
}
    

void OSG::Window::renderAllViewports(RenderActionBase *action)
{
    MFViewportPtr::iterator       portIt  = _mfPort.begin();
    MFViewportPtr::const_iterator portEnd = _mfPort.end();

    if(action != NULL)
    {
        action->setWindow(this);
        
        while(portIt != portEnd)
        {
            (*portIt)->render(action);
            ++portIt;
        }
    }
    else
    {
        SWARNING << "Window::renderAllViewports: no action!" << std::endl;
    }
}
    

void OSG::Window::resize( int width, int height )
{
    WindowPtr win(*this);
    beginEditCP(win, WidthFieldMask|HeightFieldMask|ResizePendingFieldMask);
    setWidth( width );
    setHeight( height );
    setResizePending( true );
    endEditCP  (win, WidthFieldMask|HeightFieldMask|ResizePendingFieldMask);
}
    

void OSG::Window::resizeGL( void )
{
    if ( isResizePending () )
    {
        glViewport( 0, 0, getWidth(), getHeight() );
        WindowPtr</