[Help]Question about graphics architecture for weson/wayland

[Yang Andy]

Hi Carsten

Thank you very much for your reply.

> EFL itself doesn't care what the compositor uses for acceleration. efl supports
> either software rendering using shm protocol with wayland that SHOULD work
> everywhere on all wayland compositors regardless of any driver infra, types,
> acceleration etc. - there is also egl + gles2 rendering support for acelerated
> rendering. of course compositor will then need to handle drm buffers etc. to
> make this work.

If i choose software rendering using shm protocol,dose weston(compositor)  use fbdev-backed?

My senario is that my target device do not support hardware accelerate.(do not use gpu)
But i have to use EFL to develop application in wayland/weston platform.

In order to achieve my task,how do i setup weston?

Best regards.

Andy
> Date: Mon, 18 Aug 2014 15:02:47 +0900
> From: raster at rasterman.com
> To: williamyang13 at hotmail.com
> CC: ppaalanen at gmail.com; wayland-devel at lists.freedesktop.org
> Subject: Re: [Help]Question about graphics architecture for weson/wayland
> 
> On Mon, 18 Aug 2014 05:32:41 +0000 Yang Andy <williamyang13 at hotmail.com> said:
> 
> > Hi Pekka
> > 
> > Thank you very much for your reply.
> > 
> > > > 3.In order to run weston-launch,do i have to use gpu?
> > > No, you can choose e.g. the fbdev backend for Weston, and so Weston
> > > will run on the /dev/fb, software rendered. No GPU used there in that
> > > sense. Software rendering also means that no application under Weston
> > > can use the GPU for rendering windows.
> > 
> > If i choose fbdev backend for weston,can i use EFL/Evas and EGL/OpenGL for
> > draw graphics? I mean that EGL/OpenGL which implement Software rendering.
> > 
> > What the difference between
> > drm-backend/fbdbin/eolian/impl_generator.c:ev-backend/wayland-backend/x11-backend?
> 
> EFL itself doesn't care what the compositor uses for acceleration. efl supports
> either software rendering using shm protocol with wayland that SHOULD work
> everywhere on all wayland compositors regardless of any driver infra, types,
> acceleration etc. - there is also egl + gles2 rendering support for acelerated
> rendering. of course compositor will then need to handle drm buffers etc. to
> make this work.
> 
> > Best regards.
> > 
> > Andy
> > > Date: Thu, 14 Aug 2014 16:57:26 +0300
> > > From: ppaalanen at gmail.com
> > > To: williamyang13 at hotmail.com
> > > CC: wayland-devel at lists.freedesktop.org
> > > Subject: Re: [Help]Question about graphics architecture for weson/wayland
> > > 
> > > On Thu, 14 Aug 2014 08:36:43 +0000
> > > Yang Andy <williamyang13 at hotmail.com> wrote:
> > > 
> > > > Hi everyone
> > > > 
> > > > When i run 3D application through weston-launch, it failed because the
> > > > graphics driver is not right.
> > > 
> > > weston-launch starts weston, you cannot use it to launch something else.
> > > 
> > > > I have some questions for help.
> > > > 
> > > > 1.Is there any requirement for Hardware(GPU??) / Drivers?
> > > 
> > > Yes, see hardware enabling at
> > > http://wayland.freedesktop.org/architecture.html
> > > 
> > > > 2.Is DRM  must for weston(compositor),how to setup DRM?
> > > 
> > > Weston's DRM backend depends on DRM. Make sure your kernel has a DRM
> > > driver for your graphics chip.
> > > 
> > > > 3.In order to run weston-launch,do i have to use gpu?
> > > 
> > > No, you can choose e.g. the fbdev backend for Weston, and so Weston
> > > will run on the /dev/fb, software rendered. No GPU used there in that
> > > sense. Software rendering also means that no application under Weston
> > > can use the GPU for rendering windows.
> > > 
> > > You can also choose Weston's DRM backend with the software (Pixman)
> > > renderer. That will not use the GPU either, but does need DRM and KMS.
> > > 
> > > > 4.Does GPU kernel drvier consist of kernel/driver/gpu/xxxx(xxxx.ko??) and
> > > > of kernel/driver/gpu/drm/xxxx(DRM_xxxx.ko)?
> > > 
> > > Roughly yes.
> > > 
> > > > 5.Does user side drvier consist of EGL/OpenGLES?
> > > 
> > > The user space side of the driver usually implements EGL and OpenGL
> > > (desktop/ES/whatever).
> > > 
> > > > 6.graphics architecture is
> > > > Application⇒EGL/OpenGLES/⇒libDRM⇒DRM_xxxx.ko⇒xxxx.ko⇒GPU?
> > > 
> > > Yes, where EGL/OpenGLES is actually Mesa, since you have libdrm there.
> > > This is specific to the open source drivers.
> > > 
> > > 
> > > Thanks,
> > > pq
> >  		 	   		  
> 
> -- 
> ------------- Codito, ergo sum - "I code, therefore I am" --------------
> The Rasterman (Carsten Haitzler)    raster at rasterman.com
> 
 		 	   		  
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