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AMD Open Source Driver For Vulkan

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Request: support for `R8G8B8` vertex attribute formats

glebov-andrey opened this issue · comments

commented

Currently, both the proprietary driver and RADV support them (except sRGB), but the open source driver does not.

commented

Per our dump of vulkaninfo using opensource drivers, R8G8B8 vertex attribute formats (except sRGB) are supported, including:

            FORMAT_R8G8B8A8_USCALED
            FORMAT_R8G8B8A8_SSCALED
            FORMAT_R8G8B8A8_UNORM
            FORMAT_R8G8B8A8_SNORM
            FORMAT_R8G8B8A8_UINT
            FORMAT_R8G8B8A8_SINT

@glebov-andrey, how do you find the formats are not supported?

commented

@jinjianrong Those are 4-component RGBA formats. I was referring to 3-component RGB formats, specifically:

R8G8B8_SNORM
R8G8B8_SSCALED
R8G8B8_UINT
R8G8B8_UNORM
R8G8B8_USCALED

Here's a GPUinfo report for AMDVLK on an RX 6900 XT, which does not support any R8G8B8 formats as vertex attributes: https://vulkan.gpuinfo.org/displayreport.php?id=17900#formats_buffer.
For reference, here's a report for the proprietary driver: https://vulkan.gpuinfo.org/displayreport.php?id=17902#formats_buffer.

commented

A change to add R8G8B8 support in llpc is under review: GPUOpen-Drivers/llpc#2315

commented

Thanks, it works now in 2023.Q2.3.