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How to use it?

For using Lygia with WebGPU, see the WebGPU README.

In your shader just #include the functions you need and use them:

#ifdef GL_ES
precision mediump float;
#endif

uniform vec2    u_resolution;
uniform float   u_time;

#include "lygia/space/ratio.glsl"
#include "lygia/math/decimate.glsl"
#include "lygia/draw/circle.glsl"

void main(void) {
    vec3 color = vec3(0.0);
    vec2 st = gl_FragCoord.xy/u_resolution.xy;
    st = ratio(st, u_resolution);
    
    color = vec3(st.x,st.y,abs(sin(u_time)));
    color = decimate(color, 20.);
    color += circle(st, .5, .1);
    
    gl_FragColor = vec4(color, 1.0);
}

Explore more examples here.

If you are working on a project and want to use LYGIA, you have two options: cloning a local version that you can bundle into your project; or using the server ( https://lygia.xyz ) to resolve the dependencies online.

LYGIA Locally

If you want to work locally, you must ensure that your environment can resolve #include dependencies. You can find some examples in here specifically for GLSL. Then you just need to clone LYGIA into your project relative to the shader you are loading:

    git clone https://github.com/patriciogonzalezvivo/lygia.git

or as a submodule:

    git submodule add https://github.com/patriciogonzalezvivo/lygia.git

Alternatively you may clone LYGIA without the git history and reduce the project size (9MB+) with the following command:

    npx degit https://github.com/patriciogonzalezvivo/lygia.git lygia

If you are concerned about the size of the library you might also be interested on pruning the library to only the language you are using. You can do that by using the prune.py script. For example:

    python prune.py --all --keep glsl

Alternatively, if you are working on a npm project, there is a npm bundle you could use.

If you are working on a web project you may want to resolve the dependencies using a bundler like vite glsl plugin (local bundle), esbuild glsl plugin (local bundle) or webpack glsl plugin (local bundle).

LYGIA server

If you are working on a cloud platform (like CodePen or Observable) you probably want to resolve the dependencies without needing to install anything. For that just add a link to https://lygia.xyz/resolve.js (JS) or https://lygia.xyz/resolve.esm.js (ES6 module):

    <!-- As JavaScript source -->
    <script src="https://lygia.xyz/resolve.js"></script>

    <!-- Or as an ES6 module -->
    <script type="module">
        import resolveLygia from "https://lygia.xyz/resolve.esm.js"
    </script>

Then you can resolve the dependencies by passing a string or strings[] to resolveLygia() or resolveLygiaAsync():

    // 1. FIRST

    // Sync resolver, one include at a time
    vertSource = resolveLygia(vertSource);
    fragSource = resolveLygia(fragSource);

    // OR.
    
    // Async resolver, all includes in parallel calls
    vertSource = resolveLygiaAsync(vertSource);
    fragSource = resolveLygiaAsync(fragSource);
    
    // 2. SECOND

    // Use the resolved source code 
    shdr = createShader(vertSource, fragSource);

This function can also resolve dependencies to previous versions of LYGIA by using this pattern lygia/vX.X/... or lygia/vX.X.X/... on you dependency paths. For example:

#include "lygia/v1.0/math/decimation.glsl"
#include "lygia/v1.2.1/math/decimation.glsl"

How is LYGIA organized?

The functions are divided into different categories:

• math/: general math functions and constants: PI, SqrtLength(), etc.
• space/: general spatial operations: scale(), rotate(), etc.
• color/: general color operations: luma(), saturation(), blend modes, palettes, color space conversion, and tonemaps.
• animation/: animation operations: easing
• generative/: generative functions: random(), noise(), etc.
• sdf/: signed distance field functions.
• draw/: drawing functions like digits(), stroke(), fill, etc.
• sample/: sample operations
• filter/: typical filter operations: different kind of blurs, mean and median filters.
• distort/: distort sampling operations
• lighting/: different lighting models and functions for forward/deferred/raymarching rendering
• geometry/: operation related to geometries: intersections and AABB accelerating structures.
• morphological/: morphological filters: dilation, erosion, alpha and poisson fill.

How is it designed?

LYGIA is designed to be very granular (each file holds one function), multi-language (each language has its own file extension) and flexible. Flexible how? There are some functions whose behavior can be changed using the #define keyword before including them. For example, gaussian blurs are usually done in two passes. By default, these are performed on their 1D version, but if you are interested in using a 2D kernel, all in the same pass, you will need to add the GAUSSIANBLUR_2D keyword, as follows:

    #define GAUSSIANBLUR_2D
    #include "filter/gaussianBlur.glsl"

    void main(void) {
        ...
        
        vec2 pixel = 1./u_resolution;
        color = gaussianBlur(u_tex0, uv, pixel, 9);
        ...
    }

In the same way you can change the sampling function that the gaussian uses. Ex:

// from
#define GAUSSIANBLUR_SAMPLER_FNC(TEX, UV) texture2D(TEX, UV)
// to 
#include "lygia/sample/clamp2edges.glsl"
#define GAUSSIANBLUR_SAMPLER_FNC(TEX, UV) sampleClamp2edge(TEX, UV)

Learn more about LYGIA's design principles in the DESIGN.md file.

Contributions

LYGIA has a long way to go and welcomes all kinds of contributions. You can help by:

• Bug fixing
• Translation, keeping parity between languages (GLSL, HLSL, MSL, WGSL, TSL, CUDA, OSL, etc.) is a big part of the challenge. Not all languages are the same and we want to make sure each function is optimized and carefully crafted for each environment. This means, the more eyes are looking at this, the better. Please make sure to read and understand the Design Principles before starting.
• New functions or improving the current implementations. Please take a look to the Contribution Guidelines before starting.
• Documentation. Each function has a header with some information describing the function. Make sure to fill this information when adding a new function.
• Adding new examples and integrations for new environments like: Godot, ISF, MaxMSP, etc.
• Financial sponsorships. Right now, the money that flows in is invested on the server and infrastructure. Long term plan will be to be able to pay lead contributors and maintainers.

Collaborators and sponsors are automatically added to the commercial license. Making a PR or subscribing to the GitHub sponsors program is the shortest path to get access to the commercial license. It's all automated, not red taping. LYGIA belongs to those that take care of it.

License

LYGIA belongs to those that support it. For that it is dual-licensed under the Prosperity License and the Patron License for sponsors and contributors.

Sponsors and contributors are automatically added to the Patron License and they can ignore any non-commercial rule of the Prosperity License software.

It's also possible to get a permanent commercial license hooked to a single and specific version of LYGIA.

If you have doubts please reach out to patriciogonzalezvivo at gmail dot com

Credits

Created and maintained by Patricio Gonzalez Vivo ( Mastodon | Twitter | Instagram | GitHub ) and every direct or indirect contributors to the GitHub repository.

This library has been built in many cases on top of the work of brilliant and generous people like: Inigo Quiles, Morgan McGuire, Alan Wolfe, Matt DesLauriers, Bjorn Ottosson, Hugh Kennedy, and many others.

It also is being constantly maintained, translated and/or extended by generous contributors like: Shadi El Hajj, Kathy, Bonsak Schiledrop, Amin Shazrin, Guido Schmidt, and many others.