[Mesa-dev] [PATCH 4/4] radeonsi: force non-displayable tiling based on surface dimensions

[Axel Davy]

Le 06/06/2016 12:28, Marek Olšák a écrit :
> On Mon, Jun 6, 2016 at 12:24 PM, Marek Olšák <maraeo at gmail.com> wrote:
>> On Mon, Jun 6, 2016 at 11:47 AM, Michel Dänzer <michel at daenzer.net> wrote:
>>> On 06.06.2016 18:44, Axel Davy wrote:
>>>> On 06/06/2016 11:37, Michel Dänzer wrote :
>>>>> With DRI3, st/dri could (re-)allocate buffers with the scanout flag
>>>>> first and after any window geometry changes, then re-allocate without
>>>>> the flag if the present complete event indicates that page flipping
>>>>> couldn't be used.
>>>> That sounds like a bad idea,
>>>> if someone is playing game fullscreen, then alt tab to check something,
>>>> and goes back, then st/dri would
>>>> have decided to use non-scanout images (since no flips were used when
>>>> alt-tab was used).
>>> That's why I wrote that st/dri3 should re-allocate the buffers with the
>>> scanout flag after any window geometry changes, such as when putting the
>>> game window back to fullscreen.
>> It looks like I can do the reallocation on
>> XCB_PRESENT_COMPLETE_MODE_{FLIP,COPY) changes, but that comes from
>> XCB_PRESENT_COMPLETE_NOTIFY, which seems too late.
>>
>> There is also XCB_PRESENT_CONFIGURE_NOTIFY, but it's not clear to me
>> how to get the scanout/non-scanout flag from that.
> Oh I get it now:
> - Always set SCANOUT on XCB_PRESENT_CONFIGURE_NOTIFY.
> - Reallocate to non-scanout if I receive XCB_PRESENT_COMPLETE_MODE_COPY.
>
> Marek
>
If one does alt-tab for a fullscreen application then goes back,
then for some time MODE_COPY would get received (during the alt-tab),
but then it would not be received anymore. Would CONFIGURE_NOTIFY be
received for an alt-tab ?

Also similar question when the display is turned off, then turned on.

Axel