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From the Vulkan spec, 8.13 "Interpolation Decorations":
Fragment shader inputs that are signed or unsigned integers,
integer vectors, or any double-precision floating-point type
must be decorated with Flat.
This also matches glslang behaviour.
Specifically, this fixes tone-mapping in Unreal Engine 4 on RADV
and AMDGPU-PRO, where gl_Layer is used as a fragment shader input.
Signed-off-by: Philip Rebohle <philip.rebohle@tu-dortmund.de>
Signed-off-by: Józef Kucia <jkucia@codeweavers.com>
Signed-off-by: Henri Verbeet <hverbeet@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>