FWIW here's how I'm doing it.
I set the default format at startup with my requested format:
void initOpenGL()
{
QSurfaceFormat format;
format.setVersion( 3, 3 );
format.setProfile( QSurfaceFormat::CoreProfile );
format.setDepthBufferSize( 24 );
format.setSamples( 4 );
format.setStencilBufferSize( 8 );
QSurfaceFormat::setDefaultFormat( format );
}
Then I call this to dump some info so I know what I'm getting:
void openGLInfo()
{
// we need a QSurface active to get our GL functions from the context
QWindow surface;
surface.setSurfaceType( QSurface::OpenGLSurface );
surface.create();
QOpenGLContext context;
context.create();
context.makeCurrent( &surface );
QOpenGLFunctions *funcs = context.functions();
funcs->initializeOpenGLFunctions();
qInfo() << "OpenGL Info";
qInfo() << " Vendor: " << reinterpret_cast<const char
*>(funcs->glGetString( GL_VENDOR ));
qInfo() << " Renderer: " << reinterpret_cast<const char
*>(funcs->glGetString( GL_RENDERER ));
qInfo() << " Version: " << reinterpret_cast<const char
*>(funcs->glGetString( GL_VERSION ));
qInfo() << " Shading language: " << reinterpret_cast<const char
*>(funcs->glGetString( GL_SHADING_LANGUAGE_VERSION ));
qInfo() << " Requested format: " << QSurfaceFormat::defaultFormat();
qInfo() << " Current format: " << context.format();
}
Which gives me something like this:
OpenGL Info
Vendor: NVIDIA Corporation
Renderer: NVIDIA GeForce GTX 780M OpenGL Engine
Version: 4.1 NVIDIA-10.4.2 310.41.35f01
Shading language: 4.10
Requested format: QSurfaceFormat(version 3.3, options QFlags(),
depthBufferSize 24, redBufferSize -1, greenBufferSize -1, blueBufferSize
-1, alphaBufferSize -1, stencilBufferSize 8, samples 4, swapBehavior 0,
swapInterval 1, profile 1)
Current format: QSurfaceFormat(version 4.1, options QFlags(),
depthBufferSize 24, redBufferSize 8, greenBufferSize 8, blueBufferSize 8,
alphaBufferSize -1, stencilBufferSize 8, samples 4, swapBehavior 2,
swapInterval 1, profile 1)
(Note: This only gives me a 3.0 context on VMware Fusion 8.1 running
Windows 7 - should support 3.3 - so maybe I'm doing something wrong?)
If anyone has any suggestions for improvement it would be most welcome!
---
Andy Maloney // https://asmaloney.com
twitter ~ @asmaloney <https://twitter.com/asmaloney>
On Tue, May 17, 2016 at 4:05 AM, Giuseppe D'Angelo <dange...@gmail.com>
wrote:
> On Tue, May 17, 2016 at 9:59 AM, Boudewijn Rempt <b...@valdyas.org> wrote:
> > Hm... But when I tried that with a nonsense version, say 9.9, I
> > got 9.9 back. Maybe I made a mistake, though. I copied the functions
> > check approach from the tesselation example from KDab's website...
>
> Did you _create_ the context or just set a format and asked for it
> back immediately?
>
> Using the functions for just testing whether you've got a certain GL
> version seems to me to be doing it the other way around. Then, sure,
> once you're happy with the version you need to grab them and use them.
>
> --
> Giuseppe D'Angelo
> _______________________________________________
> Interest mailing list
> Interest@qt-project.org
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>
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