On Thu, Nov 16, 2017 at 3:47 AM, Mike Lothian <m...@fireburn.co.uk> wrote:
> Will this allow us to select between iGPU and dGPU like we can with > OpenGL? Or is it just going to force radv like before? > I don't think we have a good selection method yet. > On Thu, 16 Nov 2017 at 10:09 Grazvydas Ignotas <nota...@gmail.com> wrote: > >> On Thu, Nov 16, 2017 at 12:33 AM, Dave Airlie <airl...@gmail.com> wrote: >> > On 15 November 2017 at 04:40, Jason Ekstrand <ja...@jlekstrand.net> >> wrote: >> >> This commit significantly reworks the way prime support works and lets >> >> us pull it even further into radv. The old mechanism required the >> >> specific WSI layer to be aware of the linear shadow copy that has to be >> >> done in order for prime to work. In the new paradigm, we better define >> >> what bits of wsi_image go to the client and what bits go off to the >> >> window system. It's then the job of the driver to allocate two >> separate >> >> images and stash whatever intermediates it needs in driver_private. >> >> There are a few advantages to this method: >> >> >> >> 1) It separates supporting prime from the driver decision as to >> whether >> >> it's better to render directly into the window-system-compatible >> >> image or if it's better to blit. >> >> >> >> 2) Because of this separation, it's now possible for a driver to use a >> >> different scheme for WSI image presentation where it hooks the >> >> vkCmdPipelineBarrier that transitions the image to >> >> VK_IMAGE_LAYOUT_PRESENT_SRC_KHR and does the blit there. >> >> >> >> 3) It lets us pull more of the details into radv and, in my opinion, >> >> actually makes the radv code more straightforward. >> > >> > For the record, PRIME is not radv specific, stop trying to make it so, >> > anv should support display to other GPUs. >> >> Yes it would be great if that worked, would make radv vs anv testing >> so much easier as I much prefer my display to be on dGPU. >> > Before this conversation goes much further, I think I should say that this patch is getting scrapped entirely. Dave and I spent a bunch of time yesterday rewriting the universe of Vulkan WSI to move in the direction of more common code. One of the natural fall-outs of that is that anv gets prime support for free. --Jason
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