depth_texture, square root (set to 3 for a total of 9 taps)
# Times to tap the `depth_texture`, square root (set to 3 for a total of 9 taps)
var depth_texture_taps = uniforms["depth_taps"].as(UniformInt) is lazy
lib/gamnit/depth/more_materials.nit:596,2--597,71