[Buildroot] [PATCH] package/opengl: ensure consistency between the various providers

["Jérôme Pouiller" <jezz@sysmic.org>]

On Friday 17 February 2017 11:04:36 CET Thomas Petazzoni wrote:
> Hello,
> 
> On Fri, 17 Feb 2017 09:34:38 +0100, J?r?me Pouiller wrote:
> 
> > On Thursday 16 February 2017 18:46:10 CET Arnout Vandecappelle wrote:
> > > 
> > > On 14-02-17 22:13, Yann E. MORIN wrote:  
> > > > Some GL providers will provide libegl and libgles, but not libgl, while
> > > > other will provide libgl but not libegl not libgles. This can be the
> > > > case with:
> > > >   - mesa3d       -> libgl
> > > >   - rpi-userland -> libegl and libgles  
> > 
> > Unfortunately, as far as I remember, this kind of configuration is
> > necessary to build xdriver_xf86-video-imx-viv. Mesa is necessary to
> > build GLX support but, EGL/GLes have to be provided by imx-gpu-viv.
> 
> Nope, it's not actually needed. Even with xdriver_xf86-video-imx-viv,
> the OpenGL provider is imx-gpu-viv, as it's ultimately the one that
> provides libGL.so.

Yes, replace "necessary" by "currently used" in my sentence.

> However, it is true that imx-gpu-viv is a special case as it provides a
> libGL.so that itself uses libraries provided by Mesa.
> 
> So the hack I've done so far is:
> 
> -	select BR2_PACKAGE_HAS_LIBGL if BR2_PACKAGE_XORG7
> +	select BR2_PACKAGE_HAS_LIBGL if BR2_PACKAGE_XORG7 && !BR2_PACKAGE_IMX_GPU_VIV_OUTPUT_X11
> 
> and:
> 
> -	default "mesa3d" if BR2_PACKAGE_XORG7
> +	default "mesa3d" if BR2_PACKAGE_XORG7 && !BR2_PACKAGE_IMX_GPU_VIV_OUTPUT_X11
>  
> This is a quick hack, but it allows mesa3d to *NOT* be seen as an
> OpenGL provider if imx-gpu-viv X11 support is enabled.
> 
> So I still think the rule should be: we support only one OpenGL
> provider. And the rest should be solved by exposing mesa3d as an OpenGL
> provider or not depending on Config.in options.

I agree. Give me a few days to prepare a patch that do that.


-- 
J?r?me Pouiller, Sysmic
Embedded Linux specialist
http://www.sysmic.fr