Godot 3's renderer design explained
Mircosoft Game Dev
SEPTEMBER 23, 2017
Added to that fact, Vulkan still has years to go until it's properly supported in most desktop and mobile platforms, which makes it unattractive to implement for us (as it means considerably more effort to write, debug and maintain). The image is converted to luminance and shrunk by sizes of 3x3 until it's a single pixel.
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