[gallium R600] ARB_shader_image_load_store & ARB_shader_atomic_counters support

[pstglia]

A few months ago, Dave Airlie posted a serie of patches for comments / review in order to support image_load_store and atomic_counter on r600 (evergreen/cayman cards) [1]

I've seem no update since them. If any dev could review it, r600 would be OpenGL version 4.2 compliant, as these are the 2 missing extensions to implement

[1] - https://lists.freedesktop.org/archiv...ch/111292.html

[pstglia]

In case anyone is interested

I've pushed his patches for master branch:

https://github.com/pstglia/mesa/tree/r600_ARB_shader_image_load_store

This git has also the piglit results using my HW (ARUBA/Trinity A10 5800K w/ Radeon 7660D)

Just note this is a rfc/wip. Don't know if anyone has interest in developing it yet