there seems no difference on performance Between
set all highp by precision highp float
AND
only set the necessary float to highp obvisouly while others using precision mediump float ?
test on Android fragment shader.
Was this test made under conditions where you would expect to be able to detect a performance difference? Were you using hardware where there would be a performance difference?
The test condition are all same.
Ok, but that doesn’t answer either of the questions asked.
For a reasonable analysis of this behavior, you need to answer those two questions. At least to yourself,
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