Re: 16 bpc fixed point (RGBA16) framebuffer support for core and AMD.

On Fri, Mar 19, 2021 at 10:03:12PM +0100, Mario Kleiner wrote:

Hi,

this patch series adds the fourcc's for 16 bit fixed point unorm framebuffers to the core, and then an implementation for AMD gpu's with DisplayCore.

This is intended to allow for pageflipping to, and direct scanout of, Vulkan swapchain images in the format VK_FORMAT_R16G16B16A16_UNORM. I have patched AMD's GPUOpen amdvlk OSS driver to enable this format for swapchains, mapping to DRM_FORMAT_XBGR16161616: Link: https://github.com/kleinerm/pal/commit/a25d4802074b13a8d5f7edc96ae45469ecbac...

We should also add support for these formats into igt.a Should be semi-easy by just adding the suitable float<->uint16 conversion stuff.