[Mesa-dev] Exposing (or lack of) EGL device support on platforms lacking DRM devices (Was Re: [Piglit] [PATCH 1/2] egl: Add sanity test for EGL_EXT_device_query (v3))

[Mathias Fröhlich]

Hi,

On Wednesday, 7 September 2016 12:41:46 CEST Emil Velikov wrote:
> On 6 September 2016 at 18:32, Mathias Fröhlich
> <Mathias.Froehlich at gmx.net> wrote:
> 
> >>  * Systems with fb only, disabled render nodes and/or alike.
> >> EGL implementations (in our case the libdrm API provides all the info
> >> about available DRM devices) can effectively detect the presence of
> >> HW/SW devices and expose relevant extensions.
> >> Note: The presence does not and _cannot_ imply that one will always
> >> succeed using each device.
> > So you are saying, on a system without drm device we should return a more 
or
> > less dead single EGLDeviceEXT from eglQueryDevicesEXT(...).
> 
> Nope. What I'm saying is that if the system lacks any DRM devices (or
> the devices lack any specifics) the respective device extension(s)
> won't be exposed.
> 
> Regardless if SW device is available or not there a caveat - you
> simply cannot say that using device X will work. This is what the note
> is about - a simple disclaimer.

Thanks for the clearification.
best
Mathias