[Mesa-dev] INTEL_map_texture on i915/i965

[Jason Ekstrand]

If that's true then the extension makes no sense other than maybe "we're a 
UMA, we can make things cheap." I think it's more likely that the intention 
is to use a fenced map through the GTT to do the detiling. That said, given 
how sketchy GTT maps are, it's still a pretty questionable extension at 
best and something we don't want to commit to going forward.

--Jason


On August 16, 2018 13:02:50 Ian Romanick <idr at freedesktop.org> wrote:

> My recollection is that we never implemented this because it required
> linear textures instead of tiled textures.  In every speed test we did,
> the read performance of tiled textures was so much better than the read
> performance of linear textures that it seemed unlikely to be a benefit.
> Instead, we chose to spend time making our regular texture upload paths
> more performant.
>
> On 08/16/2018 06:23 AM, Phi Nguyen wrote:
>> Hi,
>>
>> I hope to use the zero-memory copy on the Iris Pro 6200 (Broadwell/Skylake).
>>
>> The extension
>> <https://www.khronos.org/registry/OpenGL/extensions/INTEL/INTEL_map_texture.txt> 
>> says
>> only OpenGL 3.0 is required yet it does not show up on Ubuntu 18.04.  I
>> saw a post from 2016
>> <https://lists.freedesktop.org/archives/mesa-dev/2016-January/105850.html> 
>> mentioning
>> this feature, but that didn't get any replies.
>>
>> Does an implementation of this even exist?  How would I go about getting it?
>>
>> Thank you,
>> Phi
>>
>>
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