138 lines
3.8 KiB
Markdown
138 lines
3.8 KiB
Markdown
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<h1 align=center>Fragmented</h1>
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<p align=center>An image editing/compositing software for graphics programmers.</p>
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## Table of Contents
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- [Supported Platforms](#supported-platforms)
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- [Usage](#usage)
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- [Shaderlib](#shaderlib)
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- [Commandline interface](#commandline-interface)
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- [Known Issues](#known-issues)
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## Supported Platforms
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- Linux
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You can find the latest releases [here](https://github.com/ChaoticByte/Fragmented/releases/latest).
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## Usage
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With Fragemented, you are editing images by writing GDShaders. This brings almost endless opportunities to create unique art.
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If you want to learn GDShader, take a look at the [Godot docs](https://docs.godotengine.org/en/stable/tutorials/shaders/).
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The repo also includes examples. You can use them as a starting-point to write your own filters.
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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.
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### Load TEXTURE using the `//!load` directive
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```glsl
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//!load <filepath>
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```
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The main image file will be read and available as the sampler2D `TEXTURE`.
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#### Load additional images
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```glsl
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//!load+ <name> <filepath>
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uniform sampler2D <name>;
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```
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Have a look at the `place_texture.gdshader` example.
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### Have multiple steps with `//!steps n`
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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.
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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.
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Example:
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```glsl
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//!load ...
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//!steps 5
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void fragment() {
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if (STEP == 0) {
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...
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} else if (STEP == 1) {
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...
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}
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// ... and so on
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}
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```
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## Shaderlib
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> Note: The shaderlib API is still unstable as I am figuring things out. It will be declared stable with version 10.
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This repo comes with a (still small) shader library including pre-written functions and more.
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Have a look at the `shaderlib` folder.
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Here is an example:
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```glsl
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shader_type canvas_item;
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#include "res://shaderlib/oklab.gdshaderinc"
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//!load ./images/swamp.jpg
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void fragment() {
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vec4 oklab = rgb2oklab(COLOR);
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vec4 oklch = oklab2oklch(oklab);
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oklch.z -= 2.0;
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COLOR = oklab2rgb(oklch2oklab(oklch));
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}
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```
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## Commandline interface
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You can run Fragmented from the commandline or scripts.
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> Note: Headless mode is not supported. Using the commandline interface still opens a window.
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### Usage
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```
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./Fragmented cmd --shader PATH [--load-image PATH]
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--shader PATH The path to the shader
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--output PATH Where to write the resulting image to.
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In batch mode, this must be a folder.
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--load-image PATH The path to the image. This will overwrite the
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load directive of the shader file.
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Passing a folder activates batch mode.
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(optional)
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```
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You can also run `./Fragmented cmd help` to show the help message.
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### Batch Mode
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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.
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> Note: You *can* use this feature for video frames, but it will take a loooong time.
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#### Examples
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```
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./Fragmented cmd --shader ./examples/oklab.gdshader --output ./output.png
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```
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```
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./Fragmented cmd --shader ./examples/oklab.gdshader --load-image ~/Pictures/test.png --output ./output.png
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```
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## Known Issues
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- screen scaling is unsupported; Using screen scaling could lead to an either blurry UI, or no scaling at all -> see #45
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- the shaderlib API is still unstable, this will change with version 10
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- commandline interface: `--headless` is not supported
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