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Various fancy shaders for GZDoom ported from MariENB.

## Implemented Shaders

### Luma Sharpen

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

### 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.

### 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).

### LUT Grading

Premade lookup tables to alter color, all from the various MariENB editions I've made. More specialized LUTs will be added in the future.

### Technicolor

A filter that enhances color in some way, I don't know the technical details.

### 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.

### 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.

### Vignette

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

### Paint

Makes the game look like an oil painting, if you somehow are interested in that.

### RetroFX

A combo of downscaling and palette reduction (with optional dither), which has been a staple of MariENB for years. 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.

## Missing Shaders

### Bloom

It's very unlikely that this one will be added, unless I can hack something horribly using camera textures, idk.

### Depth of Field

Not a chance, this thing very blatantly needs Depth Buffer access, which is impossible in GZDoom thanks to portal rendering.

### Tonemap

Not needed, GZDoom implements its own.

### Screen Frost / Heat Haze

These aren't "general purpose" enough to be included.

### CRT Filter

Screen curvature + aperture grille overlay. I'm not going to add this back because honestly, it's dumb and ugly.

### SMAA

Can't be done due to the limited features of user shaders. It should be part of GZDoom itself, honestly.