[Feature Request] [SPIR-V] Support float16 texture types

[godlikepanos]

Hi. Is there a chance we could get float16 texture support?

When compiling this:

Texture2D<float16_t4> tex;

float4 imageMain(float4 svPosition : SV_Position) : SV_Target0
{
    return tex[svPosition.xy];
}

with -enable-16bit-types DXC returns the following error: error: 16-bit texture types not yet supported with -spirv

[Keenuts]

Hi!

Sadly, Vulkan doesn't support sampling textures with a float16.
See:

• https://registry.khronos.org/vulkan/specs/latest/man/html/StandaloneSpirv.html#VUID-StandaloneSpirv-OpTypeImage-04656
• Support for Float16 Images? KhronosGroup/Vulkan-Docs#1140
• [SPIR-V] Emit error for 16-bit texture types #6242

Allowing this now would cause issues down the line if Vulkan starts allowing 16-bit float textures.

[godlikepanos]

ooops. Weird SPIR-V omission. Thanks for looking into it.