void PixelBufferX11::init()
{
if (_initialized) return;
if (!_traits)
{
_valid = false;
return;
}
if (_traits->target != 0)
{
// we don't support Pbuffer render to texture under GLX.
_valid = false;
return;
}
_display = XOpenDisplay(_traits->displayName().c_str());
unsigned int screen = _traits->screenNum;
if (!_display)
{
OSG_NOTICE<<"Error: Unable to open display \"" << XDisplayName(_traits->displayName().c_str()) << "\"."<<std::endl;
_valid = false;
return;
}
// Query for GLX extension
int errorBase, eventBase;
if( glXQueryExtension( _display, &errorBase, &eventBase) == False )
{
OSG_NOTICE<<"Error: " << XDisplayName(_traits->displayName().c_str()) <<" has no GLX extension." << std::endl;
XCloseDisplay( _display );
_display = 0;
_valid = false;
return;
}
// OSG_NOTICE<<"GLX extension, errorBase="<<errorBase<<" eventBase="<<eventBase<<std::endl;
int major, minor;
if (glXQueryVersion(_display, &major, &minor) == False)
{
OSG_NOTICE << "Error: " << XDisplayName(_traits->displayName().c_str())
<< " can not query GLX version." << std::endl;
XCloseDisplay( _display );
_display = 0;
_valid = false;
return;
}
// Just be paranoid, if we are older than 1.1, we cannot even call glxQueryExtensionString
if (major < 1 || (1 == major && minor < 1))
{
OSG_NOTICE << "Error: " << XDisplayName(_traits->displayName().c_str())
<< " GLX version " << major << "." << minor << " is too old." << std::endl;
XCloseDisplay( _display );
_display = 0;
_valid = false;
return;
}
bool haveGLX1_3 = false;
bool haveSGIX_pbuffer = false;
// We need to have at least GLX 1.3 to use getFBConfigFromVisual and glXCreatePbuffer
if (1 < major || (1 == major && 3 <= minor))
{
haveGLX1_3 = true;
}
#if defined(GLX_VERSION_1_1) && defined(GLX_SGIX_pbuffer)
// We need at least GLX 1.1 for glXQueryExtensionsString
if (!haveGLX1_3 && 1 <= minor)
{
const char *extensions = glXQueryExtensionsString(_display, screen);
haveSGIX_pbuffer = osg::isExtensionInExtensionString("GLX_SGIX_pbuffer", extensions)
&& osg::isExtensionInExtensionString("GLX_SGIX_fbconfig", extensions);
if (haveSGIX_pbuffer)
{
osg::setGLExtensionFuncPtr(_glXCreateGLXPbufferSGIX, "glXDestroyGLXPbufferSGIX");
osg::setGLExtensionFuncPtr(_glXDestroyGLXPbufferSGIX, "glXDestroyGLXPbufferSGIX");
osg::setGLExtensionFuncPtr(_glXQueryGLXPbufferSGIX, "glXDestroyGLXPbufferSGIX");
osg::setGLExtensionFuncPtr(_glXGetFBConfigFromVisualSGIX, "glXGetFBConfigFromVisualSGIX");
if (_glXCreateGLXPbufferSGIX == NULL ||
_glXDestroyGLXPbufferSGIX == NULL ||
_glXQueryGLXPbufferSGIX == NULL ||
_glXGetFBConfigFromVisualSGIX == NULL) {
haveSGIX_pbuffer = false;
}
}
}
#endif
if (!haveGLX1_3 && !haveSGIX_pbuffer)
{
OSG_NOTICE << "Error: " << XDisplayName(_traits->displayName().c_str())
<< " no Pbuffer support in GLX available." << std::endl;
XCloseDisplay( _display );
_display = 0;
_valid = false;
return;
}
if (!createVisualInfo())
{
_traits->red /= 2;
_traits->green /= 2;
_traits->blue /= 2;
_traits->alpha /= 2;
_traits->depth /= 2;
OSG_INFO<<"Relaxing traits"<<std::endl;
if (!createVisualInfo())
{
OSG_NOTICE<<"Error: Not able to create requested visual." << std::endl;
XCloseDisplay( _display );
_display = 0;
_valid = false;
return;
}
}
// get any shared GLX contexts
GraphicsHandleX11* graphicsHandleX11 = dynamic_cast<GraphicsHandleX11*>(_traits->sharedContext.get());
Context sharedContext = graphicsHandleX11 ? graphicsHandleX11->getContext() : 0;
_context = glXCreateContext( _display, _visualInfo, sharedContext, True );
if (!_context)
{
OSG_NOTICE<<"Error: Unable to create OpenGL graphics context."<<std::endl;
XCloseDisplay( _display );
_display = 0;
_valid = false;
return;
}
#ifdef GLX_VERSION_1_3
// First try the regular glx extension if we have a new enough version available.
if (haveGLX1_3)
{
int nelements;
GLXFBConfig *fbconfigs = glXGetFBConfigs( _display, screen, &nelements );
for ( int i = 0; i < nelements; ++i )
{
int visual_id;
if ( glXGetFBConfigAttrib( _display, fbconfigs[i], GLX_VISUAL_ID, &visual_id ) == 0 )
{
if ( !_pbuffer && (unsigned int)visual_id == _visualInfo->visualid )
{
typedef std::vector <int> AttributeList;
AttributeList attributes;
attributes.push_back( GLX_PBUFFER_WIDTH );
attributes.push_back( _traits->width );
attributes.push_back( GLX_PBUFFER_HEIGHT );
attributes.push_back( _traits->height );
attributes.push_back( GLX_LARGEST_PBUFFER );
attributes.push_back( GL_TRUE );
attributes.push_back( 0L );
_pbuffer = glXCreatePbuffer(_display, fbconfigs[i], &attributes.front() );
_useGLX1_3 = true;
}
}
}
if (_pbuffer)
{
int iWidth = 0;
int iHeight = 0;
glXQueryDrawable(_display, _pbuffer, GLX_WIDTH , (unsigned int *)&iWidth);
glXQueryDrawable(_display, _pbuffer, GLX_HEIGHT , (unsigned int *)&iHeight);
if (_traits->width != iWidth || _traits->height != iHeight)
{
OSG_NOTICE << "PixelBufferX11::init(), pbuffer created with different size then requsted" << std::endl;
OSG_NOTICE << "\tRequested size (" << _traits->width << "," << _traits->height << ")" << std::endl;
OSG_NOTICE << "\tPbuffer size (" << iWidth << "," << iHeight << ")" << std::endl;
_traits->width = iWidth;
_traits->height = iHeight;
}
}
XFree( fbconfigs );
}
#endif
#ifdef GLX_SGIX_pbuffer
// If we still have no pbuffer but a capable display with the SGIX extension, try to use that
if (!_pbuffer && haveSGIX_pbuffer)
{
GLXFBConfigSGIX fbconfig = _glXGetFBConfigFromVisualSGIX( _display, _visualInfo );
typedef std::vector <int> AttributeList;
AttributeList attributes;
attributes.push_back( GLX_LARGEST_PBUFFER_SGIX );
attributes.push_back( GL_TRUE );
attributes.push_back( 0L );
_pbuffer = _glXCreateGLXPbufferSGIX(_display, fbconfig, _traits->width, _traits->height, &attributes.front() );
if (_pbuffer)
{
_useSGIX = true;
int iWidth = 0;
int iHeight = 0;
_glXQueryGLXPbufferSGIX(_display, _pbuffer, GLX_WIDTH_SGIX , (unsigned int *)&iWidth);
_glXQueryGLXPbufferSGIX(_display, _pbuffer, GLX_HEIGHT_SGIX, (unsigned int *)&iHeight);
if (_traits->width != iWidth || _traits->height != iHeight)
{
OSG_NOTICE << "PixelBufferX11::init(), SGIX_pbuffer created with different size then requsted" << std::endl;
OSG_NOTICE << "\tRequested size (" << _traits->width << "," << _traits->height << ")" << std::endl;
OSG_NOTICE << "\tPbuffer size (" << iWidth << "," << iHeight << ")" << std::endl;
_traits->width = iWidth;
_traits->height = iHeight;
}
}
XFree( fbconfig );
}
#endif
if (!_pbuffer)
{
OSG_NOTICE<<"Error: Unable to create pbuffer."<<std::endl;
XCloseDisplay( _display );
_display = 0;
_context = 0;
_valid = false;
return;
}
XFlush( _display );
XSync( _display, 0 );
_valid = true;
_initialized = true;
}
