Quote:
Originally Posted by diedel
Yet the black waves are still. Can you see them?
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Based on the (look-alike) image you posted it looks like an aliasing effect, probably due to the shader not actually rendering to 1:1 display pixels. One possible explanation for that is a high-DPI display where FS-UAE runs with a lower resolution which is then rendered to a higher-res display by the windowing system.
Are you using Windows or macOS? If you're running Windows, you can try to disable interface scaling (don't remember the setting's name) where you can choose between 100%, 150%, 200% etc to scale up fonts (etc). Try 100% and see if the shader looks correct?