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This is an older, easier to implement variant of CAS as a pure fragment shader. It doesn't support upscaling, but we won't make use of it (at least for now). The sharpening intensity can be adjusted on a per-Viewport basis. For the root viewport, it can be adjusted in the Project Settings. Since `textureLodOffset()` isn't available in GLES2, there is no way to support contrast-adaptive sharpening in GLES2.