tu: Support pipelines without a fragment shader
authorConnor Abbott <cwabbott0@gmail.com>
Wed, 6 May 2020 22:07:48 +0000 (00:07 +0200)
committerMarge Bot <eric+marge@anholt.net>
Thu, 7 May 2020 16:05:53 +0000 (16:05 +0000)
Apparently this is allowed, and the CTS started doing this more often
recently which resulted in frequent hangs running the entire CTS. I
copied the code to create an empty FS from radv.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4928>


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