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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