Re: [Qemu-devel] Question about QEMU

[유원상]

Thank you for your reply.

I understand your suggestion.
But, our embedded OS is very light, so it does not still support to change
screen resolution.
It has fixed resolution(1920x1080).
So, I want a MultiSampling(anti-aliasing) in QEMU & virglrenderer.

I know the embedded OS supports changing resolution is best.
But, QEMU window size is very flexible, but resolution of guest os is very
limit.
I think many developer want to scale fixed resolution.
For example, many android developer use the emulator.
Android emulator can scale windows fixed resolution.

I checked MULTISAMPLING features in virglrenderer, but QEMU not using it.
In QEMU source, I saw "virgl_renderer_resource_create" function call in
virtio-gpu-3d.c.
How can I control nr_samples argument?
Or, do you have another solution for multisampling(anti-aliasing) in QEMU?

Regards,
Wonsang Ryu.

2018-05-15 15:42 GMT+09:00 Gerd Hoffmann <address@hidden>:

>   Hi,
>
> > > I have a problem about screen resolution.
> > > Recommended resolution of my guest OS is 1920x1080.
> > > If a QEMU window size is 1920x1080, it is clear.
> > > But, if I change smaller of a QEMU window size, it does not display
> > > clearly.(ex: 1280x720)
> > > In this case, QEMU windows size in host is 1280x720, and guest screen
> > > resolution is 1920x1080.
>
> virtio-gpu signals to the guest that the window size has changed, and
> expected guest behavior is that it changes the guest screen resolution
> accordingly.
>
> > > I want to hold the resolution of the guest OS and scale the QEMU
> windows in
> > > the host OS.
>
> Why?
>
> Setting GL_TEXTURE_{MIN,MAG}_FILTER to GL_LINEAR for the virtio-gpu
> textures surely is possible.  But using a guest screen resolution
> matching the host window size will still give better results than
> doing any kind of scaling.
>
> cheers,
>   Gerd
>
>