Scanline modifications wanted

[Retro-Nerd]

For the moment i would like to see a nonlinear update like this from WinUAE

WinUAE D3D scanlines, 2:2, 30% opacity



Your scanlines-nonlinear shader.



The scanlines looks similar, but i like a bit more opacity.

I also like the caligari scanlines shader, which works perfectly in bsnes/higan. The scanlines looks good and the blur is pretty much what i'm looking for. Sadly it doesn't work properly in FS-UAE, tried different zooms. Maybe it need some tweaks. Can't take a proper screenshot with the distortions in FS-UAE though.

bnes/higan - caligari scanlines

[FrodeSolheim]

Originally Posted by Retro-Nerd

For the moment i would like to see a nonlinear update like this from WinUAE

WinUAE D3D scanlines, 2:2, 30% opacity



Your scanlines-nonlinear shader.



The scanlines looks similar, but i like a bit more opacity.

Hi, you can try tweaking it if you like. If you open scanlines-nonlinear.shader, you'll find these two files:

float ia = (128.0 - 10.0) / 255.0 +
        ((rgb.r + rgb.g + rgb.b) / 3.0) / 2.0;
gl_FragColor = rgb * vec4(ia, ia, ia, 1.0);

You can for example insert this line right before gl_FragColor..:

ia = ia * 0.8;

So you'll get:

float ia = (128.0 - 10.0) / 255.0 +
        ((rgb.r + rgb.g + rgb.b) / 3.0) / 2.0;
ia = ia * 0.8;
gl_FragColor = rgb * vec4(ia, ia, ia, 1.0);

(if it's not opaque enough, try with 0.7, or 0.6, etc )

Originally Posted by Retro-Nerd

I also like the caligari scanlines shader, which works perfectly in bsnes/higan. The scanlines looks good and the blur is pretty much what i'm looking for. Sadly it doesn't work properly in FS-UAE, tried different zooms. Maybe it need some tweaks. Can't take a proper screenshot with the distortions in FS-UAE though.

bnes/higan - caligari scanlines

It looks like it works just fine. One issue with some of these shaders is that they assume pixels are not already doubled - which they generally are in *UAE to account for high-res/low-res/interlaced graphics.

Try using the shader with the following options:

low_resolution = 1
line_doubling = 0

Here's how a cropped sections looks like on my 1920x1080 display with lowres:


Quite nice shader actually

[FrodeSolheim]

Originally Posted by Retro-Nerd

Can't take a proper screenshot with the distortions in FS-UAE though.

Btw, when you use the built-in screenshot function (F12+s or PrintScrn when having input grab), it will also save a screenshot of the OpenGL buffer (blablabla-real-date-xx.png). The "crop"/"full" screenshots are from the Amiga video output, while the "real" one is a proper screenshot of a complete OpenGL frame.

[spajdr]

Yeah more scanline pr0n!

[Retro-Nerd]

Originally Posted by FrodeSolheim

Hi, you can try tweaking it if you like. If you open scanlines-nonlinear.shader, you'll find these two files:

float ia = (128.0 - 10.0) / 255.0 +
        ((rgb.r + rgb.g + rgb.b) / 3.0) / 2.0;
gl_FragColor = rgb * vec4(ia, ia, ia, 1.0);

You can for example insert this line right before gl_FragColor..:

ia = ia * 0.8;

So you'll get:

float ia = (128.0 - 10.0) / 255.0 +
        ((rgb.r + rgb.g + rgb.b) / 3.0) / 2.0;
ia = ia * 0.8;
gl_FragColor = rgb * vec4(ia, ia, ia, 1.0);

(if it's not opaque enough, try with 0.7, or 0.6, etc )

Mmh, this ia = ia * 0.8; doesn't work properly. I get scanlines on bright white areas. It destroys the nonlinear effect. I did it exactly as you said.


For caligari scanlines: You are right, it works fine with lores & non-doubled pixels. Sadly games with small text fonts looks terrible then, but the most lores games are fine.

[Retro-Nerd]

Any chances that you modify (or least the option for) your scanlines-nonlinear-blur.shader to match the saturation/color hue from TysonJacobs D3D CRT shader?

http://eab.abime.net/support-winuae/...e-release.html

[FrodeSolheim]

Originally Posted by Retro-Nerd

Any chances that you modify (or least the option for) your scanlines-nonlinear-blur.shader to match the saturation/color hue from TysonJacobs D3D CRT shader?

An update on this thread; Retro-Nerd got a shader I modified which has greatly exaggerated saturation/colors (not something for my taste though)

Originally Posted by Retro-Nerd

http://eab.abime.net/support-winuae/...e-release.html

FS-UAE won't support HLSL, as FS-UAE uses OpenGL and thus GLSL. It does not really matter, as both languages to the same thing.

I will not be creating CRT emulation shaders myself, but there does exist CRT / curvature shaders in correct format already (some are even included in FS-UAE). I'll only be maintaining relatively simple shaders myself...

If the existing "CRT shaders" are not good enough, your only hope is that someone else steps up to the challenge

[Retro-Nerd]

An update on this thread; Retro-Nerd got a shader I modified which has greatly exaggerated saturation/colors

Many thanks again for that, Frode. FYI: I use the test.shader in the "shaders" folder. You can tinker with the following values:

const float HARD_LIGHT = 0.4; // 0.4 is good

const float LIGHTNESS_GAMMA = 1.3

[FrodeSolheim]

Hmm.. yes.. I now noticed that several test shaders were bundled with FS-UAE 2.3.4 by accident, some may even be embarrassingly bad and/or mis-named as I was experimenting a bit

Some of the test shades aren't all that bad. They have some nice features:
- scanlines are always aligned with screen pixels and not Amiga pixels. One would think this would be noticeable, but it isn't really... - The result is that scanlines look decent even with non-integer Amiga display scaling (i.e. it works quite well with autoscaling).
- variable scanline width depending on screen height (currently two different sizes, for ~720p screens and ~1080p screens).
- scanline intensity is done in HSL color mode, so the screen is not desatured due to scanlines - and some other color correction is experimented with as well.

I will have to clean this up though...