[Mesa-dev] GBM backend dynamic dispatch method

[Jammy Zhou]

2016-05-12 17:39 GMT+08:00 Michel Dänzer <michel at daenzer.net>:

> On 12.05.2016 17:58, Yu, Qiang wrote:
> > Oh, what a crazy idea. So you mean it can work like this?
> >
> > 1. use the libgbm/gbm_dri/libEGL/libGLES from mesa which will load
> > radeonsi_dri.so
> >
> > 2. libGL/amdgpu_dri.so from amdgpu-pro
>
> glamor uses libEGL/GBM and libGL, so this could only work with Mesa's
> libGL (or the GLVND one in the future). Can amdgpu_dri.so work with
> Mesa's libGL right now?
>

I think amdgpu_dri.so is not completely compatible with Mesa's libGL
(considering some special feature requirements for amdgpu-pro and Mesa's
evolving). Another problem is that Mesa's libgbm cannot share necessary
buffer attributes (such as tiling info, etc) with amdgpu_dri.so at this
moment.


>
> Also, I'm afraid there might still be cases where amdgpu-pro supports
> new hardware before radeonsi, in which case amdgpu_dri.so needs to
> support GBM for glamor and EGL in general.
>

IIRC radeonsi can support Southern Islands and later ASICs. I don't think
amdgpu-pro can support pre-GCN products easily, given current amdgpu kernel
driver support.


>
> Also note that Nvidia developers were talking about possibly creating an
> nvidia specific GBM backend recently on the wayland-devel mailing list.
>

Will nvidia open source their code for GBM backend?


>
>
> --
> Earthling Michel Dänzer               |               http://www.amd.com
> Libre software enthusiast             |             Mesa and X developer
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