Fragmented
An image editing/compositing software for graphics programmers.
## Table of Contents
- [Supported Platforms](#supported-platforms)
- [Usage](#usage)
- [Shaderlib](#shaderlib)
- [Commandline interface](#commandline-interface)
- [Known Issues](#known-issues)
## Supported Platforms
- Linux
You can find the latest releases [here](https://github.com/ChaoticByte/Fragmented/releases/latest).
## Usage
With Fragemented, you are editing images by writing GDShaders. This brings almost endless opportunities to create unique art.
If you want to learn GDShader, take a look at the [Godot docs](https://docs.godotengine.org/en/stable/tutorials/shaders/).
The repo also includes examples. You can use them as a starting-point to write your own filters.
Besides the regular GDShader stuff, Fragmented also has so-called directives. Those allow to further control the behaviour of the application. The most important directive is `//!load` to load an image.
### Load TEXTURE using the `//!load` directive
```glsl
//!load
```
The main image file will be read and available as the sampler2D `TEXTURE`.
#### Load additional images
```glsl
//!load+
uniform sampler2D ;
```
Have a look at the `place_texture.gdshader` example.
### Have multiple steps with `//!steps n`
You can apply your shaderfile multiple times. At every additional step, `TEXTURE` is the result of the previous step. This can be used to chain effects that cannot be easily chained otherwise.
To query the current step index, a `STEP` uniform is automatically injected. If `steps` is set to `0`, your shader won't be applied at all.
Example:
```glsl
//!load ...
//!steps 5
void fragment() {
if (STEP == 0) {
...
} else if (STEP == 1) {
...
}
// ... and so on
}
```
## Shaderlib
> Note: The shaderlib API is still unstable as I am figuring things out. It will be declared stable with version 10.
This repo comes with a (still small) shader library including pre-written functions and more.
Have a look at the `shaderlib` folder.
Here is an example:
```glsl
shader_type canvas_item;
#include "res://shaderlib/oklab.gdshaderinc"
//!load ./images/swamp.jpg
void fragment() {
vec4 oklab = rgb2oklab(COLOR);
vec4 oklch = oklab2oklch(oklab);
oklch.z -= 2.0;
COLOR = oklab2rgb(oklch2oklab(oklch));
}
```
## Commandline interface
You can run Fragmented from the commandline or scripts.
> Note: Headless mode is not supported. Using the commandline interface still opens a window.
### Usage
```
./Fragmented cmd --shader PATH [--load-image PATH]
--shader PATH The path to the shader
--output PATH Where to write the resulting image to.
In batch mode, this must be a folder.
--load-image PATH The path to the image. This will overwrite the
load directive of the shader file.
Passing a folder activates batch mode.
(optional)
```
You can also run `./Fragmented cmd help` to show the help message.
### Batch Mode
Since version v8.0, you can pass a directory to `--load-image` and `--output`. This will process all images in the input directory and write the output to the output directory.
> Note: You *can* use this feature for video frames, but it will take a loooong time.
#### Examples
```
./Fragmented cmd --shader ./examples/oklab.gdshader --output ./output.png
```
```
./Fragmented cmd --shader ./examples/oklab.gdshader --load-image ~/Pictures/test.png --output ./output.png
```
## Known Issues
- screen scaling is unsupported; Using screen scaling could lead to an either blurry UI, or no scaling at all -> see #45
- the shaderlib API is still unstable, this will change with version 10
- commandline interface: `--headless` is not supported