[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 #2 from Stephane Chevigny <stephane.chevigny at polymtl.ca> ---
The expected output:
value[i].x (= gl_GlobalInvocationID.x ;)  should be equal to value[i].y  and
value[i].w (= gl_WorkGroupID.x * gl_LocalGroupSizeARB.x +
gl_LocalInvocationID.x;)  for all indices i according to spec. With the
parameter I gave to glDispatchComputeGroupSizeARB, the divergence of the result
happen after the indice i = 63 on my computer. So value[i].x = value[i].z
(=gl_LocalInvocationID.x;) instead.

So on my computer, gl_GlobalInvocationID.x appear to be only equal to
gl_LocalInvocationID.x notgl_WorkGroupID.x * gl_LocalGroupSizeARB.x +
gl_LocalInvocationID.x or I misread the spec.

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