Alyssa Rosenzweig
8d1adc091b
it turns out we have explicit control over helper invocations; if a particular bit in the fragment shader descriptor is set, helper invocations are launched; if it clear, they are not. Helper invocations are required whenever computing derivatives, whether explicitly (dFdx/dFdy) *or* implicitly (any texturing). Accordingly, we set this bit when texturing to fix edge case behaviour (literally, haha). Thank you to Jason Ekstrand and Ilia Mirkin for pointing out the representative dEQP test failed along triangle edges and for suggesting helper invocations / derivatives as a list of suspect pieces (which led to discovering the helper invocations enable bit in the first place). Ideally we would use the new NIR analysis pass for this, but that hasn't landed quite yet. Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
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