[osg-users] Specifying the GL context version to request

Mon Aug 21 09:34:14 PDT 2017

Hi Sandro,

On 21 August 2017 at 17:21, Sandro Mani <manisandro at gmail.com> wrote:

> Are you building the OSG with defaults?  Or are you building the OSG for
> just GL3?
>
> %cmake -DBUILD_OSG_EXAMPLES=ON -DBUILD_DOCUMENTATION=ON
> -DOSG_GL1_AVAILABLE=ON -DOSG_GL2_AVAILABLE=ON -DOPENGL_PROFILE=GLCORE
> -DOPENGL_HEADER1="#include <GL/gl.h>"
>

That's a bit of ugly mix.  Things should work with just:

cmake .
make -j 4   # 4 is number of cores available

When you using the OPENGL_PROFILE it'll set the OSG_*_AVAILABLE options for
you, but in general build with defaults unless you specifically need a
particular feature set.

>
> What viewer are using with osgEarth?  osgEarth itself is typically used as
> NodeKit with end user application creating their own viewer and with it
> graphics contexts.  This means even if osgEarth's own example programs
> changed the way they create graphics context you'd end up with issues.
>
> Running with osgearth_viewer, I get two calls to
> osgViewer::GraphicsWindowX11::init. The first one where, I assume, it
> tries to determine the capabilities of hardware/driver in use, and this
> calls Traits without a DisplaySettings instance:
>
> #0  osgViewer::GraphicsWindowX11::init (this=this at entry=0x1004ad330)
>     at /usr/src/debug/OpenSceneGraph-3.5.7-0.2.gitbfbaeca.fc27.x86_
> 64/src/osgViewer/GraphicsWindowX11.cpp:915
> #1  0x00007f3e23ae4b50 in osgViewer::GraphicsWindowX11::GraphicsWindowX11
> (traits=0x1003760d0, this=<optimized out>)
>     at /usr/src/debug/OpenSceneGraph-3.5.7-0.2.gitbfbaeca.fc27.x86_
> 64/include/osgViewer/api/X11/GraphicsWindowX11:56
> #2  X11WindowingSystemInterface::createGraphicsContext (this=<optimized
> out>, traits=0x1003760d0)
>     at /usr/src/debug/OpenSceneGraph-3.5.7-0.2.gitbfbaeca.fc27.x86_
> 64/src/osgViewer/GraphicsWindowX11.cpp:2269
> #3  0x00007f3e241e81b7 in osg::GraphicsContext::createGraphicsContext
> (traits=traits at entry=0x1003760d0)
>     at /usr/src/debug/OpenSceneGraph-3.5.7-0.2.gitbfbaeca.fc27.x86_
> 64/src/osg/GraphicsContext.cpp:128
> #4  0x00007f3e2350c256 in MyGraphicsContext::MyGraphicsContext
> (this=<synthetic pointer>)
>     at /usr/src/debug/osgearth-2.9-0.2.git43d4ba5.fc27.x86_64/src/
> osgEarth/Capabilities.cpp:76
> #5  osgEarth::Capabilities::Capabilities (this=0x100390f30)
>     at /usr/src/debug/osgearth-2.9-0.2.git43d4ba5.fc27.x86_64/src/
> osgEarth/Capabilities.cpp:162
> #6  0x00007f3e236897a5 in osgEarth::Registry::initCapabilities
> (this=0x1002a7af0)
>     at /usr/src/debug/osgearth-2.9-0.2.git43d4ba5.fc27.x86_64/src/
> osgEarth/Registry.cpp:484
> #7  0x00007f3e23689829 in osgEarth::Registry::getCapabilities
> (this=0x1002a7af0)
>     at /usr/src/debug/osgearth-2.9-0.2.git43d4ba5.fc27.x86_64/src/
> osgEarth/Registry.cpp:468
> #8  0x00007f3dfa209486 in osgEarth::Registry::capabilities ()
>     at /usr/src/debug/osgearth-2.9-0.2.git43d4ba5.fc27.x86_64/src/
> osgEarth/Registry:149
> #9  osgEarth::Drivers::MPTerrainEngine::MPTerrainEngineNode::MPTerrainEngineNode
> (this=0x100a1ac60)
>     at /usr/src/debug/osgearth-2.9-0.2.git43d4ba5.fc27.x86_64/src/
> osgEarthDrivers/engine_mp/MPTerrainEngineNode.cpp:202
> [...]
>
> Then, a second time here:
>
> #0  osgViewer::GraphicsWindowX11::init (this=this at entry=0x100676840)
>     at /usr/src/debug/OpenSceneGraph-3.5.7-0.2.gitbfbaeca.fc27.x86_
> 64/src/osgViewer/GraphicsWindowX11.cpp:915
> #1  0x00007f3e23ae4b50 in osgViewer::GraphicsWindowX11::GraphicsWindowX11
> (traits=0x10052c100, this=<optimized out>)
>     at /usr/src/debug/OpenSceneGraph-3.5.7-0.2.gitbfbaeca.fc27.x86_
> 64/include/osgViewer/api/X11/GraphicsWindowX11:56
> #2  X11WindowingSystemInterface::createGraphicsContext (this=<optimized
> out>, traits=0x10052c100)
>     at /usr/src/debug/OpenSceneGraph-3.5.7-0.2.gitbfbaeca.fc27.x86_
> 64/src/osgViewer/GraphicsWindowX11.cpp:2269
> #3  0x00007f3e241e81b7 in osg::GraphicsContext::createGraphicsContext
> (traits=traits at entry=0x10052c100)
>     at /usr/src/debug/OpenSceneGraph-3.5.7-0.2.gitbfbaeca.fc27.x86_
> 64/src/osg/GraphicsContext.cpp:128
> #4  0x00007f3e23a7ab62 in osgViewer::SingleWindow::configure
> (this=0x100a2a370, view=...)
>     at /usr/src/debug/OpenSceneGraph-3.5.7-0.2.gitbfbaeca.fc27.x86_
> 64/src/osgViewer/config/SingleWindow.cpp:72
> #5  0x00007f3e23a7a80a in osgViewer::SingleScreen::configure
> (this=<optimized out>, view=...)
>     at /usr/src/debug/OpenSceneGraph-3.5.7-0.2.gitbfbaeca.fc27.x86_
> 64/src/osgViewer/config/SingleScreen.cpp:29
> #6  0x00007f3e23a75207 in osgViewer::AcrossAllScreens::configure
> (this=<optimized out>, view=...)
>     at /usr/src/debug/OpenSceneGraph-3.5.7-0.2.gitbfbaeca.fc27.x86_
> 64/src/osgViewer/config/AcrossAllScreens.cpp:48
> #7  0x00007f3e23ab79c2 in osgViewer::View::apply (this=0x7fffffffdb00,
> config=0x1002a3770)
>     at /usr/src/debug/OpenSceneGraph-3.5.7-0.2.gitbfbaeca.fc27.x86_
> 64/src/osgViewer/View.cpp:456
> #8  0x00007f3e23ab7b00 in osgViewer::View::setUpViewAcrossAllScreens
> (this=<optimized out>)
>     at /usr/src/debug/OpenSceneGraph-3.5.7-0.2.gitbfbaeca.fc27.x86_
> 64/src/osgViewer/View.cpp:463
> [...]
>
> using ViewAcrossAllScreens as you anticipated and hence the default
> DisplaySettings. Since by default a "1.0" context is created, the result is:
>
> FRAGMENT glCompileShader "main(fragment)" FAILED
> FRAGMENT Shader "main(fragment)" infolog:
> 0:1(10): error: GLSL 3.30 is not supported. Supported versions are: 1.10,
> 1.20, 1.30, 1.00 ES, 3.00 ES, 3.10 ES, and 3.20 ES
>
> etc.
>
> If I add
>
> osg::DisplaySettings::instance()->setGLContextVersion( "4.0" );
> osg::DisplaySettings::instance()->setGLContextProfileMask( 0x1 );
>
> at the beginning of a tweaked osgearth_viewer.cpp at main, things work
> (though possibly osgEarth::Capabilities::Capabilities will have
> incorrectly determined some things since a "1.0" context was created
> there). The same effect can indeed be achieved by using the environment
> variables you mention.
>

Try using the OSG_GL_CONTEXT_VERSION and OSG_GL_CONTEXT_PROFILE_MASK env
vars instead of the above DisplaySettings::instance() code i,e,

export OSG_GL_CONTEXT_VERSION=4.0
export OSG_GL_CONTEXT_PROFILE_MASK=1

This will still require the merged changes to OSG master, but as long as
the ViewAcrossAllScreens is used the DisplaySettings::instance() should
automatically initialize with the correct values.

Robert.
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