[PATCH v2 xf86-video-dummy] Add glamor acceleration which enables native OpenGL support (v2)

[Yu, Qiang]

>> And with modesetting or intel drivers:
>> [   738.822] (II) glamor: OpenGL accelerated X.org driver based.
>> [   738.827] (II) glamor: EGL version 1.4 (DRI2):
>> [   738.836] (II) DUMMY(0): glamor initialized
>> [   738.836] (--) Depth 24 pixmap format is 32 bpp
>> [   738.957] (II) DUMMY(0): Using 3904 scanlines of offscreen memory
>> [   738.957] (==) DUMMY(0): Backing store enabled
>> [   738.957] (==) DUMMY(0): Silken mouse enabled
>> [   738.957] (==) RandR enabled
>> [   738.959] (II) SELinux: Disabled by boolean
>> [   738.960] (II) AIGLX: Screen 0 is not DRI2 capable
>> [   738.960] (EE) AIGLX: reverting to software rendering
>>
>> And in both cases, glxinfo reports that my dummy screen uses software
>> rendering. (Accelerated: no, Gallium 0.4 on llvmpipe..)
>>
>> What am I doing wrong?
>>
> The error message should be harmless.
Yes. My implementation doesn't support DRI2 which is required by AIGLX hw acc.
AIGLX hw acc is not needed if you are using DRI3 mesa which will still use GPU
for the rendering.

Regards,
Qiang