Various fancy shaders for GZDoom ported from MariENB.

Luma Sharpen

Boosts small details. Doesn't cause noticeable halos like a typical sharpening filter.

Color Grading Suite

Control over RGB gamma/intensity, along with a "tint" filter that, with a negative intensity, can also be used as a color booster (dunno how this even works, I wrote it 7 years ago lol). On top of all that, you can also do the same for saturation and value (not hue because that would just be dumb).

Color Matrix

General purpose color mixing. The matrix is normalized in post. For experienced users.

Hue-Saturation

The GIMP filter in shader form. Allows shifting the hue and tweaking the saturation and value of red, yellow, green, cyan, blue and magenta ranges.

Curves (TODO)

8-point curve filter with cubic interpolation. Works just like the GIMP filter, with curves for value, red, green and blue.

BlurSharpShift

Blurring followed by sharpening, followed by chromatic aberration. This is a meme filter chain that a lot of people love for some reason, claiming it adds "photorealism" or something.

Grain

Makes the screen fuzzy. A couple parameters can be tweaked freely.

Screen Dirt

Overlays a noisy pattern onto the screen to make it filthy. Not a very good filter, tbh, but I just kept it in for historical reasons.

Vignette

Darkens the edges of the screen. Comes with "border blur", which also blurs said edges.

Palette Reduction w/ Dither

Part of the "Retro FX" megashader from old MariENB versions. Does what it says on the tin. There's a multitude of palettes available to choose from. Most IWADs are covered, along with some notable megawads, various DOS games, and a couple "standard" palettes.