On Wed, 5 Sep 2018 at 15:22, Julien Valentin <julienvalenti...@gmail.com> wrote:
> for your code you should replace
> wsi->getNumScreens()
> with
> wsi->getNumScreens(osg::GraphicsContext::ScreenIdentifier(1))
> to work on DISPLAY=:1.0
Sounds like we are getting to the bottom of things now :-)
FYI, WindowingSystemInterface::getNumScreens() is implemented in
include/osg/GraphicsContext as:
virtual unsigned int getNumScreens(const ScreenIdentifier&
screenIdentifier = ScreenIdentifier()) = 0;
The default constructed ScreenIdentifier is:
GraphicsContext::ScreenIdentifier::ScreenIdentifier():
displayNum(0),
screenNum(0) {}
Which is fine if the system doesn't change the default DISPLAY from 0.0.
Support for DISPLAY is actually built into ScreenIdentifier via the
readDISPLAY() method:
/** Read the DISPLAY environmental variable, and set the
ScreenIdentifier accordingly.
* Note, if either of displayNum or screenNum are not
defined then -1 is set respectively to
* signify that this parameter has not been set. When
parameters are undefined one can call
* call setUndefinedScreenDetailsToDefaultScreen() after
readDISPLAY() to ensure valid values. */
void readDISPLAY();
To is not called by the constructor though, so you need to call it
explicitly. The various Viewer config implementations do actually
call readDISPLAY:
~/OpenSceneGraph/src/osgViewer$ grep readDISPLAY */*.cpp
config/AcrossAllScreens.cpp: si.readDISPLAY();
config/PanoramicSphericalDisplay.cpp: si.readDISPLAY();
config/SingleWindow.cpp: traits->readDISPLAY();
config/SingleWindow.cpp: si.readDISPLAY();
config/SphericalDisplay.cpp: si.readDISPLAY();
config/WoWVxDisplay.cpp: si.readDISPLAY();
So I'd suggest using this, such as (modified main.cpp for osgtest:
std::cout << wsi->getNumScreens() << " screen(s) detected" << std::endl;
for ( unsigned int screen=0 ; screen <
wsi->getNumScreens(main_screen_id); screen++ )
{
osg::GraphicsContext::ScreenIdentifier screen_id(screen);
osg::GraphicsContext::ScreenSettings screen_settings;
wsi->getScreenSettings( screen_id, screen_settings );
std::cout << " Screen #" << screen << " : "
<< screen_settings.width << "x" <<
screen_settings.height << " "
<< screen_settings.refreshRate << "Hz "
<< screen_settings.colorDepth << " bit" << std::endl;
}
I have also attached the full modified file.
Robert.
#include <iostream>
#include <osgViewer/Viewer>
int main(int argc, char** argv)
{
osg::ArgumentParser arguments(&argc, argv);
osgViewer::Viewer viewer(arguments);
osg::GraphicsContext::WindowingSystemInterface* wsi = osg::GraphicsContext::getWindowingSystemInterface();
if ( !wsi )
{
std::cout << "ERROR. Could not access the Windowing System Interface" << std::endl;
throw -1;
}
osg::GraphicsContext::ScreenIdentifier main_screen_id;
main_screen_id.readDISPLAY();
std::cout << wsi->getNumScreens() << " screen(s) detected" << std::endl;
for ( unsigned int screen=0 ; screen < wsi->getNumScreens(main_screen_id); screen++ )
{
osg::GraphicsContext::ScreenIdentifier screen_id(screen);
osg::GraphicsContext::ScreenSettings screen_settings;
wsi->getScreenSettings( screen_id, screen_settings );
std::cout << " Screen #" << screen << " : "
<< screen_settings.width << "x" << screen_settings.height << " "
<< screen_settings.refreshRate << "Hz "
<< screen_settings.colorDepth << " bit" << std::endl;
}
viewer.run();
return 0;
}
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