Occlusion queries use query pool entries to track the number of samples that pass all the perfragment tests. The mechanism of collecting an occlusion query value is described in Occlusion Queries.
The occlusion query sample counter increments by one for each sample with a coverage value of 1 in each fragment that survives all the per-fragment tests, including scissor, sample mask, alpha to coverage, stencil, and depth tests.
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