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What does "Sample test cull rate" mean?

In the streamline counters, what does the "Sample test cull rate" mean in Mali Geometry Culling Rate?

"The percentage of primitives entering the sample coverage test that are killed by it." -- This is tips for this counter. But i can not get the exact meaning of it. 

So please explain it for details, many thanks!

Parents
  • It's all about arm64 structure, there is a tile blinning pass before fragment pass, which will do tile and rasterization job or any stuff. sorry I could not offer some refer, because I read these in a chinese translate version(may be not correct somehow). I'm now finding the explanation of "Z plane culled rate "

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  • It's all about arm64 structure, there is a tile blinning pass before fragment pass, which will do tile and rasterization job or any stuff. sorry I could not offer some refer, because I read these in a chinese translate version(may be not correct somehow). I'm now finding the explanation of "Z plane culled rate "

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