[osg-users] EXTERNAL: Re: EXTERNAL: Re: Where is CreateContextAttribs() being used?

Mon Apr 15 12:33:58 PDT 2019

Let's try that again:
https://gist.github.com/gwaldron/a56b0e77e7fa8587b698717d21f9366d

Glenn Waldron

On Mon, Apr 15, 2019 at 3:33 PM Glenn Waldron <gwaldron at gmail.com> wrote:

> Here's a quick reference for building OSG (and osgEarth) for GL CORE...
> may be helpful.
>
> Glenn Waldron
>
>
> On Thu, Apr 11, 2019 at 10:49 AM Sebastian Messerschmidt <
> sebastian.messerschmidt at gmx.de> wrote:
>
>> Merlin,
>>
>>
>>
>> As Chris already mentioned the complete application needs to run on
>> core-profile. That means there is no fixed function pipeline and no
>> backward-compatibility features.
>>
>> In order to get your application running in core-profile you need to
>> write shaders for everything and IIRC compile OSG with GL3 enabled. I
>> haven’t used OSG in a while now, but I think there is mechanism to decorate
>> the scene graph with shaders automatically.
>>
>>
>>
>> I started to refactor my project some years ago to fully support
>> core-only scenarios, but I gave up due to a lot features no longer working
>> out-of-the-box.
>>
>> Can you maybe try to explain what you’re trying to debug? There might be
>> some more options for you.
>>
>>
>>
>>
>>
>> Cheers
>>
>> Sebastian
>>
>>
>>
>> *From:* osg-users <osg-users-bounces at lists.openscenegraph.org> *On
>> Behalf Of *Rowley, Marlin R
>> *Sent:* Donnerstag, 11. April 2019 16:24
>> *To:* OpenSceneGraph Users <osg-users at lists.openscenegraph.org>
>> *Subject:* Re: [osg-users] EXTERNAL: Re: EXTERNAL: Re: Where is
>> CreateContextAttribs() being used?
>>
>>
>>
>> Sebastian,
>>
>>
>>
>> What does “core OpenGL profile” mean with regards to the graphics
>> context?  I’m still not getting it to work.
>>
>>
>>
>> Here is my code structure:
>>
>>
>>
>> …
>>
>> osg::ref_ptr<osg::GraphicsContext::Traits> traits = new osg::
>> GraphicsContext::Traits;
>>
>>             traits->x = aXPosition;
>>
>>             traits->y = aYPosition;
>>
>>             traits->width  = aWidth;
>>
>>             traits->height = aHeight;
>>
>>             traits->stencil = 8;
>>
>>             traits->doubleBuffer     = true;
>>
>>             traits->windowDecoration = false;
>>
>> #if defined(WIN32)
>>
>>             traits->inheritedWindowData = new osgViewer::
>> GraphicsWindowWin32::WindowData( aWindow );
>>
>> #elif defined(__linux__)
>>
>>            traits->inheritedWindowData = new
>> osgViewer::GraphicsWindowX11::WindowData( aWindow );
>>
>> #endif
>>
>>             // gl graphics context version and profile mask
>>
>>             *traits**->**glContextVersion **=* *"3.3"**;*
>>
>>             *traits**->**glContextProfileMask = 0x1;*
>>
>>
>>
>> // create the graphics window from the context
>>
>>             osgViewer::GraphicsWindow* gw = dynamic_cast<osgViewer::
>> GraphicsWindow*>(osg::GraphicsContext
>> ::createGraphicsContext(traits.get()));
>>
>>
>>
>> …
>>
>>
>>
>> // set the main camera to use the window
>>
>> mainCamera->setGraphicsContext( gw );
>>
>>
>>
>> …
>>
>>
>>
>> I assume here that setting the traits variable with the major/minor
>> version of OpenGL and setting the profile mask to 1 (‘core’??) would be all
>> I need.  But that’s obviously not the case.
>>
>>
>>
>> -M
>>
>>
>>
>> ----------------------------------------
>>
>> Marlin Rowley
>>
>> Software Engineer, Staff
>>
>> [image: cid:image002.jpg at 01D39374.DEC5A2E0]
>>
>> *Missiles and Fire Control*
>>
>> 972-603-1931 (office)
>>
>> 214-926-0622 (mobile)
>>
>> marlin.r.rowley at lmco.com
>>
>>
>>
>> *From:* osg-users <osg-users-bounces at lists.openscenegraph.org> *On
>> Behalf Of *sebastian.messerschmidt at gmx.de
>> *Sent:* Thursday, April 11, 2019 9:01 AM
>> *To:* 'OpenSceneGraph Users' <osg-users at lists.openscenegraph.org>
>> *Subject:* EXTERNAL: Re: [osg-users] EXTERNAL: Re: Where is
>> CreateContextAttribs() being used?
>>
>>
>>
>> Hi Marlin,
>>
>>
>>
>> In order for RenderDoc (and most tools I’m aware of) you’re application
>> needs to run on core OpenGL profile.
>>
>> You might want to look here for some debugging options:
>> https://www.khronos.org/opengl/wiki/Debugging_Tools
>>
>> I personally used Nvidia Nsight for quite a while, as it at least helps
>> with framebuffer debugging etc.
>>
>>
>>
>> Cheers
>>
>> Sebastian
>>
>>
>>
>>
>>
>> *From:* osg-users <osg-users-bounces at lists.openscenegraph.org> *On
>> Behalf Of *Rowley, Marlin R
>> *Sent:* Donnerstag, 11. April 2019 14:52
>> *To:* OpenSceneGraph Users <osg-users at lists.openscenegraph.org>
>> *Subject:* Re: [osg-users] EXTERNAL: Re: Where is CreateContextAttribs()
>> being used?
>>
>>
>>
>> We are using Win10-x64.
>>
>>
>>
>> We are trying to get RenderDoc to be able to see our application so we
>> can do some graphics debugging.  It’s shouting back that the current device
>> context wasn’t created using CreateContextAttrib, so I started looking. So
>> since we are using Win64, doesn’t look like osg will go the WindowWin32
>> route. Hmm…
>>
>>
>>
>> How are you debugging the GPU?  It’s incredibly difficult trying to solve
>> realtime pipeline problems without the use of a graphics debugger.
>>
>>
>>
>> ----------------------------------------
>>
>> Marlin Rowley
>>
>> Software Engineer, Staff
>>
>> [image: cid:image002.jpg at 01D39374.DEC5A2E0]
>>
>> *Missiles and Fire Control*
>>
>> 972-603-1931 (office)
>>
>> 214-926-0622 (mobile)
>>
>> marlin.r.rowley at lmco.com
>>
>>
>>
>> *From:* osg-users <osg-users-bounces at lists.openscenegraph.org> *On
>> Behalf Of *Robert Osfield
>> *Sent:* Thursday, April 11, 2019 7:16 AM
>> *To:* OpenSceneGraph Users <osg-users at lists.openscenegraph.org>
>> *Subject:* EXTERNAL: Re: [osg-users] Where is CreateContextAttribs()
>> being used?
>>
>>
>>
>> Hi Marlin,
>>
>>
>>
>> A great for CreateContextttribs in the OSG shows:
>>
>>
>>
>> $ grep -r CreateContextAttribs .
>> Binary file ./lib/libosgViewer.so.3.6.4 matches
>> Binary file
>> ./src/osgViewer/CMakeFiles/osgViewer.dir/GraphicsWindowX11.cpp.o matches
>> ./src/osgViewer/GraphicsWindowX11.cpp:        typedef GLXContext
>> (*glXCreateContextAttribsARBProc)(Display*, GLXFBConfig, GLXContext, Bool,
>> const int*);
>> ./src/osgViewer/GraphicsWindowX11.cpp:
>> glXCreateContextAttribsARBProc glXCreateContextAttribsARB = 0;
>> ./src/osgViewer/GraphicsWindowX11.cpp:
>> glXCreateContextAttribsARB = (glXCreateContextAttribsARBProc)
>> glXGetProcAddress((const GLubyte*)"glXCreateContextAttribsARB");
>> ./src/osgViewer/GraphicsWindowX11.cpp:        if
>> (glXCreateContextAttribsARB)
>> ./src/osgViewer/GraphicsWindowX11.cpp:            _context =
>> glXCreateContextAttribsARB( _display, _fbConfig, sharedContext, True,
>> contextAttributes.data() );
>> ./src/osgViewer/GraphicsWindowWin32.cpp:extern HGLRC WINAPI
>> wglCreateContextAttribsARB (HDC, HGLRC, const int *);
>> ./src/osgViewer/GraphicsWindowWin32.cpp:
>> PFNWGLCREATECONTEXTATTRIBSARBPROC wglCreateContextAttribsARB =
>> ./src/osgViewer/GraphicsWindowWin32.cpp:                (
>> PFNWGLCREATECONTEXTATTRIBSARBPROC ) wglGetProcAddress(
>> "wglCreateContextAttribsARB" );
>> ./src/osgViewer/GraphicsWindowWin32.cpp:            if(
>> wglCreateContextAttribsARB==0 )
>> ./src/osgViewer/GraphicsWindowWin32.cpp:
>> reportErrorForScreen( "GL3: wglCreateContextAttribsARB not available.",
>> ./src/osgViewer/GraphicsWindowWin32.cpp:                context =
>> wglCreateContextAttribsARB( _hdc, 0, attribs );
>> ./src/osgViewer/GraphicsWindowWin32.cpp:
>> reportErrorForScreen( "GL3: wglCreateContextAttribsARB returned NULL.",
>>
>>
>>
>> So only X11 and Win32.  What platform are you using?
>>
>>
>>
>> Robert.
>>
>>
>>
>>
>>
>>
>>
>> On Thu, 11 Apr 2019 at 00:32, Rowley, Marlin R <marlin.r.rowley at lmco.com>
>> wrote:
>>
>> We are trying to run the graphics debugger called ‘RenderDoc’.  It’s
>> spitting out an error message after we create a window and it’s device
>> context.  I’ve been looking through the osg code to find a function called
>> CreateContextAttribs().  I can’t seem to locate it. My idea is to override
>> where it’s used or refactor something into the code where we can call the
>> function ourselves.
>>
>>
>>
>> In the meantime, I’m setting the traits->glContextVersion = “3.3” in our
>> graphics application but RenderDoc is still shouting “Context not created
>> via CreateContextAttribs.  Capturing disabled.”
>>
>>
>>
>> -M
>>
>>
>>
>> ----------------------------------------
>>
>> Marlin Rowley
>>
>> Software Engineer, Staff
>>
>> [image: cid:image002.jpg at 01D39374.DEC5A2E0]
>>
>> *Missiles and Fire Control*
>>
>> 972-603-1931 (office)
>>
>> 214-926-0622 (mobile)
>>
>> marlin.r.rowley at lmco.com
>>
>>
>>
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>>
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>
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