Hugo Locurcio a9c0c5484f Add support for contrast-adaptive sharpening in 3D (GLES3 only) ...

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.

2021-06-21 15:37:31 +02:00

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