[Mesa-dev] [Bug 110480] vkcube renders too brightly on radv

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110480

Bas Nieuwenhuizen <bas at basnieuwenhuizen.nl> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |NOTABUG
             Status|NEW                         |RESOLVED

--- Comment #6 from Bas Nieuwenhuizen <bas at basnieuwenhuizen.nl> ---
Okay, looks like there is

https://github.com/KhronosGroup/Vulkan-Tools/blob/master/cube/cube.c

This demo picks the first surface format provided by the driver.

Looking at AMDVLK (with vulkaninfo, under "Presentable Surfaces"):

GPU id       : 0 (Radeon RX Vega)
Surface type : VK_KHR_xcb_surface
Formats:                count = 2
        B8G8R8A8_UNORM
        B8G8R8A8_SRGB

Looking at radv:

GPU id       : 0 (AMD RADV VEGA10 (LLVM 9.0.0))
Surface type : VK_KHR_xcb_surface
Formats:                count = 2
        B8G8R8A8_SRGB
        B8G8R8A8_UNORM


So the first format chosen is just different.

Whether any app should choose _SRGB or _UNORM is more complicated (as UNORM
images are typically still interpreted by the windowing system as SRGB, but
_SRGB gives you automatic linear->srgb color conversions during rendering.
Doing one of those conversion typically makes everything all lighter or all
darker)

Closing assuming this is the vkcube you referenced. You'll likely find Intel
has the same behavior as radv.

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