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For all questions related to shaders, i.e. the programmable part of the GPU pipeline. For language-specific shader questions, see also the [glsl] and [hlsl] tags.

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OpenGL Compute Shader Shared Maximum

You can figure out which thread has the max value by modifying x: pack gl_LocalInvocationIndex in the least significant bits of x. The number of bits you need for the index depends on your group size. …
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