amdgpu: DRI3 with EGL?

[Michel Dänzer]

On 16/10/17 06:21 PM, Kai Wasserbäch wrote:
> Michel Dänzer wrote on 16.10.2017 18:05:
>> On 16/10/17 05:53 PM, Kai Wasserbäch wrote:
>>>
>>> Hey,
>>> I'm not sure whether this is a bug or if I'm just missing something. I've got
>>> the following stack (Debian testing as a base):
>>> GPU: Hawaii PRO [Radeon R9 290] (ChipID = 0x67b1)
>>> Mesa: Git:master/c7a81dcea9
>>> libdrm: 2.4.84-2
>>> LLVM: SVN:trunk/r315850 (6.0 devel)
>>> X.Org: 2:1.19.3-2
>>> Linux: 4.13.7
>>> Firmware (firmware-amd-graphics): 20170823-1
>>> libclc: Git:master/df9db2adca
>>> DDX (xserver-xorg-video-amdgpu): 1.4.0-1
>>>
>>> In my xorg.conf I have (and if I read the manpage correctly, the »Option "DRI"
>>> "3"« line shouldn't even be necessary anymore):
>>>> Section "Device"
>>>>         Identifier      "Forced to amdgpu with DRI3"
>>>>         Driver          "amdgpu"
>>>>         Option          "DRI"                   "3"
>>>> EndSection
>>>
>>> But when I look at my Xorg.0.log or the output of eglinfo, I see the following
>>> lines:
>>> - Xorg.0.log:	[    15.305] (II) glamor: EGL version 1.5 (DRI2):
>>> - eglinfo:	EGL version string: 1.5 (DRI2)
>>>
>>> My understanding was, that amdgpu supports DRI3 for quite some time now and
>>> therefore would expect to see something like "EGL version string: 1.5 (DRI3)".
>>>
>>> What am I missing?
>>
>> Only that those messages are about a different "DRI2" than the
>> alternative to DRI3.
> 
> ah, I was not aware of that. What „DRI“ is meant here then?

The API exposed by *_dri.so to the EGL runtime. It's called "DRI2"
because it had to be changed from the original API when DRI2 was
introduced. However, that wasn't necessary for DRI3.


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

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