Scanline shader problem

[TysonJacobs]

I'm having a problem writing a shader generating scanlines. None of the shaders which generate scanlines which come with UAE seem to work. However, they use the hacky dosbox method of generating the screen positions, which won't necessarily work on WinUAE. So I wrote a test scanline shader which uses direct3d to directly tell me where on the screen I am. This works correctly in Dosbox, but the output is still wrong in WinUAE. It looks like the image is being scaled after the shader completes, even though with the options I'm using there should be no scaling taking place.

WinUAE


Dosbox (the banding is not present in the actual image)

[Toni Wilen]

"pre" shader output texture size was wrong (display size, not internal Amiga display size). Does http://www.winuae.net/files/b/winuae.zip fix it?

Remember to configure scanline shader to use filter levels -1 to -4.

[TysonJacobs]

My problem was that scaling was set to default, which made my brain not register that setting. I guess default corrects for overscan. I changed scaling to fullscreen(max) and it works perfectly, in slot -1 or 0. Thanks!

[Toni Wilen]

Defaults are never perfect for anyone, they are only "good enough" for normal use

btw, you still get scaling artifacts if window size is not exactly same as internal Amiga size and you use filter level 0 or higher.