[Mesa-dev] INTEL_map_texture on i915/i965

[Lionel Landwerlin]

Hey Phi,

I can confirm this extension isn't implemented in Mesa.
I don't why it wasn't.

Talking briefly with Jason, it seems that mapping texture makes less 
sense on Skylake and above generations.
There we maintain compressed version of the textures in memory to 
further reduce memory bandwidth.
This would make the memory mapped mechanism more costly because we would 
need to decompress the texture when you want to access it (probably 
close to a ReadPixels in terms of performance).

-
Lionel

On 16/08/18 14:23, 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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> mesa-dev at lists.freedesktop.org
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