Hi Robert, its because I link with mesa3d instead of opengl and mesa3d
does not support the WGL_ARB_PIXEL_FORMAT. When I link with opengl the
osgProducer::Viewer is working properly because the
WGL_ARB_PIXEL_FORNAT is supported. But I need to link with mesa3d in
order to perform 16 bits per channel rendering. I don't have try osg
2.x yet. I suppose this is the right time to do so :) Thanks
Jo
On 10/3/07, Robert Osfield <[EMAIL PROTECTED]> wrote:
> Hi Jonathan,
>
> Have you tried the 2.x series of the OSG at all? It has a new window
> set up path that may well solve the issues you are seeing.
>
> Curiously I don't recall any reports of inifinite loops under 1.2.
>
> What hardware are you working on? Have you tried updating the OpenGL
> drivers?
>
> Robert.
>
> On 10/3/07, Jonathan Richard <[EMAIL PROTECTED]> wrote:
> > Hi, does the osgProducer::Viewer (I use osg 1.2) is suppose to work if
> > the WGL_ARB_PIXEL_FORNAT is not supported? It seems fall in an
> > infinite loop ( in the method VisualChooser::choose( Display *dpy, int
> > screen, bool strict_adherence) ) when this extension is not
> > supported. The variable "failed" is always true (can not be change to
> > false) so the while(failed) is always executed The code is:
> >
> > VisualInfo *VisualChooser::choose( Display *dpy, int screen, bool
> > strict_adherence)
> > {
> > if (_vinfo)
> > return _vinfo;
> >
> > if (_visual_attributes.empty())
> > setSimpleConfiguration();
> >
> > int vid;
> > bool failed = false;
> >
> > WGLExtensions *ext = WGLExtensions::instance();
> > if (ext && ext->isSupported(WGLExtensions::ARB_pixel_format))
> > {
> > do
> > {
> > std::vector<int> attribs;
> > for (std::vector<VisualAttribute>::const_iterator
> > i=_visual_attributes.begin(); i!=_visual_attributes.end(); ++i)
> > applyAttribute(*i, attribs);
> > attribs.push_back(0);
> >
> > unsigned int num_formats;
> > failed = !ext->wglChoosePixelFormat(*dpy,
> > &attribs.front(), 0, 1, &vid, &num_formats) || num_formats == 0;
> > if (failed)
> > {
> > // **** DRIVER BUG? It seems that some ATI cards don't
> support
> > // **** the WGL_SWAP_METHOD_ARB attribute. Now we try to
> remove
> > // **** it from the attribute list and choose a pixel
> > format again.
> > for (std::vector<int>::iterator k=attribs.begin();
> > k!=attribs.end(); ++k)
> > {
> > if (*k == WGL_SWAP_METHOD_ARB)
> > {
> > // attribute come in sequential attribute,paramter
> pairs
> > // as WGL specifications so we need to delete
> > two entries
> > attribs.erase(k,k+2);
> > break;
> > }
> > }
> >
> > failed = !ext->wglChoosePixelFormat(*dpy,
> > &attribs.front(), 0, 1, &vid, &num_formats) || num_formats == 0;
> > }
> >
> > if (failed)
> > {
> > if (strict_adherence || _visual_attributes.empty())
> > break;
> >
> > std::cerr << "Producer::VisualChooser: the requested
> > visual is not available, trying to relax attributes..." << std::endl;
> > _visual_attributes.pop_back();
> > }
> >
> > } while (failed);
> > }
> >
> > if (failed || !ext ||
> !ext->isSupported(WGLExtensions::ARB_pixel_format))
> > {
> > std::cerr << "Producer::VisualChooser: unable to setup a valid
> > visual with WGL extensions, switching to compatibility mode" <<
> > std::endl;
> >
> > failed = false;
> > do
> > {
> > PIXELFORMATDESCRIPTOR pfd;
> > ZeroMemory(&pfd, sizeof(pfd));
> > pfd.nSize = sizeof(pfd);
> > pfd.nVersion = 1;
> > pfd.dwFlags = PFD_DRAW_TO_WINDOW;
> > pfd.iLayerType = PFD_MAIN_PLANE;
> >
> > for (std::vector<VisualAttribute>::const_iterator
> > i=_visual_attributes.begin(); i!=_visual_attributes.end(); ++i)
> > {
> > if (i->attribute() == UseGL) pfd.dwFlags
> > |= PFD_SUPPORT_OPENGL;
> > if (i->attribute() == DoubleBuffer) pfd.dwFlags
> > |= PFD_DOUBLEBUFFER | PFD_SWAP_EXCHANGE;
> > if (i->attribute() == Stereo) pfd.dwFlags
> > |= PFD_STEREO;
> > if (i->attribute() == RGBA)
> > pfd.iPixelType = PFD_TYPE_RGBA;
> > if (i->attribute() == BufferSize)
> > pfd.cColorBits = i->parameter();
> > if (i->attribute() == RedSize) pfd.cRedBits
> > = i->parameter();
> > if (i->attribute() == GreenSize)
> > pfd.cGreenBits = i->parameter();
> > if (i->attribute() == BlueSize) pfd.cBlueBits
> > = i->parameter();
> > if (i->attribute() == AlphaSize)
> > pfd.cAlphaBits = i->parameter();
> > if (i->attribute() == AccumRedSize)
> > pfd.cAccumRedBits = i->parameter();
> > if (i->attribute() == AccumGreenSize)
> > pfd.cAccumGreenBits = i->parameter();
> > if (i->attribute() == AccumBlueSize)
> > pfd.cAccumBlueBits = i->parameter();
> > if (i->attribute() == AccumAlphaSize)
> > pfd.cAccumAlphaBits = i->parameter();
> > if (i->attribute() == DepthSize)
> > pfd.cDepthBits = i->parameter();
> > if (i->attribute() == StencilSize)
> > pfd.cStencilBits = i->parameter();
> > if (i->attribute() == AuxBuffers)
> > pfd.cAuxBuffers = i->parameter();
> > }
> >
> > pfd.cAccumBits = pfd.cAccumRedBits + pfd.cAccumGreenBits +
> > pfd.cAccumBlueBits + pfd.cAccumAlphaBits;
> >
> > vid = ChoosePixelFormat(*dpy, &pfd);
> > if ( vid != 0 )
> > {
> > // Is this additional check neccessary ?
> > // Did anyone encountered a situation where
> > // ChoosePixelFormat returned PXIELFORMAT worse than
> required ?
> > _visual_id = static_cast<unsigned int>(vid);
> > VisualInfo pfd;
> > DescribePixelFormat(*dpy, _visual_id,
> > sizeof(PIXELFORMATDESCRIPTOR), &pfd);
> > bool boolOK = true;
> > for (std::vector<VisualAttribute>::const_iterator
> > i=_visual_attributes.begin(); i!=_visual_attributes.end(); ++i)
> > {
> > if (i->attribute() == UseGL) boolOK &=
> > !!( pfd.dwFlags & PFD_SUPPORT_OPENGL );
> > if (i->attribute() == DoubleBuffer) boolOK &=
> > !!( pfd.dwFlags & ( PFD_DOUBLEBUFFER | PFD_SWAP_EXCHANGE ) );
> > if (i->attribute() == Stereo) boolOK &=
> > !!( pfd.dwFlags & PFD_STEREO );
> > if (i->attribute() == RGBA) boolOK &=
> > pfd.iPixelType == PFD_TYPE_RGBA;
> > if (i->attribute() == BufferSize) boolOK &=
> > pfd.cColorBits >= i->parameter();
> > if (i->attribute() == RedSize) boolOK &=
> > pfd.cRedBits >= i->parameter();
> > if (i->attribute() == GreenSize) boolOK &=
> > pfd.cGreenBits >= i->parameter();
> > if (i->attribute() == BlueSize) boolOK &=
> > pfd.cBlueBits >= i->parameter();
> > if (i->attribute() == AlphaSize) boolOK &=
> > pfd.cAlphaBits >= i->parameter();
> > if (i->attribute() == AccumRedSize) boolOK &=
> > pfd.cAccumRedBits >= i->parameter();
> > if (i->attribute() == AccumGreenSize) boolOK &=
> > pfd.cAccumGreenBits >= i->parameter();
> > if (i->attribute() == AccumBlueSize) boolOK &=
> > pfd.cAccumBlueBits >= i->parameter();
> > if (i->attribute() == AccumAlphaSize) boolOK &=
> > pfd.cAccumAlphaBits >= i->parameter();
> > if (i->attribute() == DepthSize) boolOK &=
> > pfd.cDepthBits >= i->parameter();
> > if (i->attribute() == StencilSize) boolOK &=
> > pfd.cStencilBits >= i->parameter();
> > if (i->attribute() == AuxBuffers) boolOK &=
> > pfd.cAuxBuffers >= i->parameter();
> > }
> > if ( !boolOK )
> > vid = 0;
> > }
> >
> > if( vid == 0 )
> > {
> > failed = true;
> > if (strict_adherence || _visual_attributes.empty())
> > break;
> >
> > std::cerr << "Producer::VisualChooser: the requested
> > visual is not available, trying to relax attributes..." << std::endl;
> > _visual_attributes.pop_back();
> > }
> >
> > } while (failed);
> >
> > }
> >
> > if (failed)
> > {
> > std::cerr << "Producer::VisualChooser: could not choose the
> > pixel format" << std::endl;
> > return 0;
> > }
> >
> > _visual_id = static_cast<unsigned int>(vid);
> >
> > // we set _vinfo for compatibility, but it's going to be unused
> > // because the pixel format is usually chosen by visual ID rather
> > // than by descriptor.
> > _vinfo = new VisualInfo;
> > DescribePixelFormat(*dpy, _visual_id,
> > sizeof(PIXELFORMATDESCRIPTOR), _vinfo);
> >
> > return _vinfo;
> > }
> > _______________________________________________
> > osg-users mailing list
> > [email protected]
> > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
> >
> _______________________________________________
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