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OpenSceneGraph/src/osgViewer/PixelBufferX11.cpp

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/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
*
* This library is open source and may be redistributed and/or modified under
* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
* (at your option) any later version. The full license is in LICENSE file
* included with this distribution, and on the openscenegraph.org website.
*
* 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
* OpenSceneGraph Public License for more details.
*/
/* Note, elements of PixelBufferX11 have used Prodcer/RenderSurface_X11.cpp as both
* a guide to use of X11/GLX and copiying directly in the case of setBorder().
* These elements are license under OSGPL as above, with Copyright (C) 2001-2004 Don Burns.
*/
#include <osgViewer/api/X11/PixelBufferX11>
#include <osgViewer/api/X11/GraphicsWindowX11>
#include <osg/GLExtensions>
#include <X11/Xlib.h>
#include <unistd.h>
using namespace osgViewer;
PixelBufferX11::PixelBufferX11(osg::GraphicsContext::Traits* traits)
: _valid(false),
_pbuffer(0),
_visualInfo(0),
_initialized(false),
_realized(false),
_useGLX1_3(false)
{
_traits = traits;
init();
if (valid())
{
setState( new osg::State );
getState()->setGraphicsContext(this);
if (_traits.valid() && _traits->sharedContext.valid())
{
getState()->setContextID( _traits->sharedContext->getState()->getContextID() );
incrementContextIDUsageCount( getState()->getContextID() );
}
else
{
getState()->setContextID( osg::GraphicsContext::createNewContextID() );
}
}
}
PixelBufferX11::~PixelBufferX11()
{
close(true);
}
#if defined(GLX_VERSION_1_3) || defined(GLX_SGIX_pbuffer)
bool PixelBufferX11::createVisualInfo()
{
typedef std::vector<int> Attributes;
Attributes attributes;
attributes.push_back(GLX_USE_GL);
attributes.push_back(GLX_RGBA);
if (_traits->doubleBuffer) attributes.push_back(GLX_DOUBLEBUFFER);
attributes.push_back(GLX_RED_SIZE); attributes.push_back(_traits->red);
attributes.push_back(GLX_GREEN_SIZE); attributes.push_back(_traits->green);
attributes.push_back(GLX_BLUE_SIZE); attributes.push_back(_traits->blue);
attributes.push_back(GLX_DEPTH_SIZE); attributes.push_back(_traits->depth);
if (_traits->alpha) { attributes.push_back(GLX_ALPHA_SIZE); attributes.push_back(_traits->alpha); }
if (_traits->stencil) { attributes.push_back(GLX_STENCIL_SIZE); attributes.push_back(_traits->stencil); }
#if defined(GLX_SAMPLE_BUFFERS) && defined (GLX_SAMPLES)
if (_traits->sampleBuffers) { attributes.push_back(GLX_SAMPLE_BUFFERS); attributes.push_back(_traits->sampleBuffers); }
if (_traits->sampleBuffers) { attributes.push_back(GLX_SAMPLES); attributes.push_back(_traits->samples); }
#endif
// TODO
// GLX_AUX_BUFFERS
// GLX_ACCUM_RED_SIZE
// GLX_ACCUM_GREEN_SIZE
attributes.push_back(None);
_visualInfo = glXChooseVisual( _display, _traits->screenNum, &(attributes.front()) );
return _visualInfo != 0;
}
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)
// 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);
}
#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)
{
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;
}
void PixelBufferX11::closeImplementation()
{
// OSG_NOTICE<<"Closing PixelBufferX11"<<std::endl;
if (_display)
{
if (_context)
{
glXDestroyContext(_display, _context );
}
if (_pbuffer)
{
if (_useGLX1_3)
{
#ifdef GLX_VERSION_1_3
glXDestroyPbuffer(_display, _pbuffer);
#endif
}
else
{
#ifdef GLX_SGIX_pbuffer
glXDestroyGLXPbufferSGIX(_display, _pbuffer);
#endif
}
}
XFlush( _display );
XSync( _display,0 );
}
_pbuffer = 0;
_context = 0;
if (_visualInfo)
{
XFree(_visualInfo);
_visualInfo = 0;
}
if (_display)
{
XCloseDisplay( _display );
_display = 0;
}
_initialized = false;
_realized = false;
_valid = false;
}
#else
// fallback for non GLX1.3 versions where pbuffers are not supported.
// note, this makes the rest of the pbuffer code a non op as init is false;
bool PixelBufferX11::createVisualInfo()
{
return false;
}
void PixelBufferX11::init()
{
}
void PixelBufferX11::closeImplementation()
{
// OSG_NOTICE<<"Closing PixelBufferX11"<<std::endl;
_pbuffer = 0;
_context = 0;
_initialized = false;
_realized = false;
_valid = false;
}
#endif
bool PixelBufferX11::realizeImplementation()
{
if (_realized)
{
OSG_NOTICE<<"PixelBufferX11::realizeImplementation() Already realized"<<std::endl;
return true;
}
if (!_initialized) init();
if (!_initialized) return false;
_realized = true;
return true;
}
bool PixelBufferX11::makeCurrentImplementation()
{
if (!_realized)
{
OSG_NOTICE<<"Warning: GraphicsWindow not realized, cannot do makeCurrent."<<std::endl;
return false;
}
// OSG_NOTICE<<"PixelBufferX11::makeCurrentImplementation "<<this<<" "<<OpenThreads::Thread::CurrentThread()<<std::endl;
#ifdef OSG_USE_EGL
return eglMakeCurrent(_display, _pbuffer, _pbuffer, _context)==EGL_TRUE;
#else
return glXMakeCurrent( _display, _pbuffer, _context )==True;
#endif
}
bool PixelBufferX11::makeContextCurrentImplementation(osg::GraphicsContext* readContext)
{
// OSG_NOTICE<<"PixelBufferX11::makeContextCurrentImplementation() not implementation yet."<<std::endl;
return makeCurrentImplementation();
}
bool PixelBufferX11::releaseContextImplementation()
{
if (!_realized)
{
OSG_NOTICE<<"Warning: GraphicsWindow not realized, cannot do makeCurrent."<<std::endl;
return false;
}
// OSG_NOTICE<<"PixelBufferX11::releaseContextImplementation() "<<this<<" "<<OpenThreads::Thread::CurrentThread()<<std::endl;
#ifdef OSG_USE_EGL
return eglMakeCurrent( _display, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT )==EGL_TRUE;
#else
return glXMakeCurrent( _display, None, NULL )==True;
#endif
}
void PixelBufferX11::bindPBufferToTextureImplementation(GLenum buffer)
{
OSG_NOTICE<<"PixelBufferX11::bindPBufferToTextureImplementation() not implementation yet."<<std::endl;
}
void PixelBufferX11::swapBuffersImplementation()
{
if (!_realized) return;
// OSG_NOTICE<<"PixelBufferX11::swapBuffersImplementation "<<this<<" "<<OpenThreads::Thread::CurrentThread()<<std::endl;
#ifdef OSG_USE_EGL
eglSwapBuffers( _display, _pbuffer );
#else
glXSwapBuffers( _display, _pbuffer );
#endif
}
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