[Bug 103393] glDispatchComputeGroupSizeARB : gl_GlobalInvocationID.x != gl_WorkGroupID.x * gl_LocalGroupSizeARB.x + gl_LocalInvocationID.x

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=103393

--- Comment #3 from Ilia Mirkin <imirkin at alum.mit.edu> ---
OK, I see. The relevant shader is fill_cs_450.glsl. It puts stuff into the
array with values

(gl_GlobalInvocationID.x, t, gl_LocalInvocationID.x, t)

where t = gl_WorkGroupID.x * gl_LocalGroupSizeARB.x + gl_LocalInvocationID.x

Ideally the values printed should be (x, x, l, x) -- i.e. t ==
gl_GlobalInvocationID.x.

With nouveau this outputs a bunch of BS... sometimes gl_GlobalInvocationID.x ==
gl_LocalInvocationID.x, other times gl_GlobalInvocationID.x == randomish value.
I suspect this is a combination of a nouveau bug and a core bug [the latter of
which is affecting the radeonsi output]. Going to try to take a look.

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