https://bugs.freedesktop.org/show_bug.cgi?id=103393
Bug ID: 103393
Summary: glDispatchComputeGroupSizeARB : gl_GlobalInvocationID
!= gl_WorkGroupID.x * gl_LocalGroupSizeARB.x +
gl_LocalInvocationID.x
Product: Mesa
Version: 17.2
Hardware: x86-64 (AMD64)
OS: Linux (All)
Status: NEW
Severity: normal
Priority: medium
Component: Drivers/Gallium/radeonsi
Assignee: dri-devel@lists.freedesktop.org
Reporter: stephane.chevi...@polymtl.ca
QA Contact: dri-devel@lists.freedesktop.org
Created attachment 134977
--> https://bugs.freedesktop.org/attachment.cgi?id=134977&action=edit
Difference between the result of gl_GlobalInvocationID and gl_WorkGroupID.x *
gl_LocalGroupSizeARB.x + gl_LocalInvocationID.x;
The spec for ARB_compute_variable_group_size in this file
https://www.khronos.org/registry/OpenGL/extensions/ARB/ARB_compute_variable_group_size.txt
state that gl_GlobalInvocationID = gl_WorkGroupID * gl_LocalGroupSizeARB +
gl_LocalInvocationID; but on my computer, arch linux with Radeon RX 580 Series
(AMD POLARIS10 / DRM 3.18.0 / 4.13.
7-1-ARCH, LLVM 5.0.0) : mesa version 17.2.2, gl_GlobalInvocationID =
gl_LocalInvocationID ; only. If I replace uint i = gl_GlobalInvocation.x with
uint i = gl_WorkGroupID.x * gl_LocalGroupSizeARB.x + gl_LocalInvocationID.x
the output of the compute shader work as expected.
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