[Mesa-dev] [PATCH] [rfc] radv: offset images by a differing amount.

[Christian König]

Am 07.07.2017 um 18:51 schrieb Marek Olšák:
> On Fri, Jul 7, 2017 at 11:18 AM, Christian König
> <deathsimple at vodafone.de> wrote:
>> What tilling format have the destination textures?
>>
>> Sounds like the offset is just added so that we distribute memory accesses
>> more equally over memory channels.
> You can't set an offset that is not aligned. The hardware ignores the
> low unaligned bits, so they have a different meaning. They specify
> pipe and bank rotation for macro tiling. It's like a state. It
> basically rotates the tile pattern.

Yeah, I know. That's what I meant with distributing memory accesses more 
equally over all channels. The lower bits select a memory bank swizzle IIRC.

I've tried years ago with R600 if shuffling them randomly could improve 
performance, but MRT wasn't widely used and/or supported at that time.

Christian.

>
> Marek