[Help]Question about graphics architecture for weson/wayland

[Yang Andy]

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/fbdev-backend/wayland-backend/x11-backend?

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
 		 	   		  
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