Depth of field optimizations and cleanup #13110
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Depth of field optimizations and cleanup Former-commit-id: 16da49e930014f56baa4f3c553d8ee49de0455c9
The main change here is to use R-only texture format for the circle of confusion (which only needs to store a single value per pixel) rather than using an RGBA texture. This will save space and should be more bandwidth efficient to sample from during the subsequent blur passes.
Also removes
sampleDistancefrom the blur shader-- it's not used AFAICT and deleting this code removes the need for passing cameraMinMaxZ uniform.Other changes here are just minor cleanup.