lygia

LYGIA Shader Library

Tired of searching, porting and/or reimplementing the same functions over and over? LYGIA is a shader library of reusable functions that can be included easily into your projects. LYGIA is very granular and designed for reusability, performance, and flexibility. LYGIA can easily be added to any project or framework.

How to use it?

In your shader #include the functions you need:

#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);
}

LYGIA Locally

If you are working locally in an environment that can resolve #include dependencies, just 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

LYGIA on the cloud

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

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

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

To then 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);

Integrations examples

Learn more about LYGIA and how to use it from these examples:

• 2D examples for Processing (GLSL)
• 2D/3D examples for P5.js (GLSL)
• 2D examples for Three.js + React (GLSL) by Eduard Fossas
• 2D examples for Three.js (GLSL)
• 3D examples for Three.js (GLSL) by Guido Schmidt
• 2D examples for OpenFrameworks (GLSL)
• 2D/3D examples for Unity3D (HLSL)
• 2D examples for Touch Designer (GLSL) (dynamic resolver) by Leith Ben Abdessalem
• 2D examples for Touch Designer (GLSL) (static resolver) by Victor Saz
• 2D examples on Observable Notebook (GLSL) by Radames Ajna
• Figma's noise&texture plugin by Rogie King. You will need to go to the "Custom" tab on the plugin to edit shaders and load LYGIA modules
• 3D example on Irmf by Glenn Lewis
• 2D/3D examples on GlslViewer (GLSL)
• 2D examples on Ossia by Jean-Michaël Celerier

For more information, guidance, or feedback about using LYGIA, join #Lygia channel on shader.zone discord.

How is it 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
• simulate/: simulate sampling operations
• lighting/: different lighting models and functions for foward/deferred/raymarching rendering
• geometry/: operation related to geometries: intersections and AABB accelerating structures.
• morphological/: morphological filters: dilation, erosion, alpha and poisson fill.

Flexible how?

There are some functions whose behavior can be changed using the #defines keyword before including it. For example, gaussian blurs are usually are 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 this way:

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

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

Design Principles

1. It relies on #include "path/to/file.*lsl" which is defined by Khronos GLSL standard and requires a typical C-like pre-compiler MACRO which is easy to implement with just basic string operations to resolve dependencies.

Here you can find some implementations on different languages:

• C#:

  . GLSLIncludes a small utility to add the include feature to glsl by z0rg.

• C++:

  . VERA's routines for resolving GLSL dependencies.

• Python:

  . Small and simple routing to resolve includes

• JavaScript:

  . vanilla JS (online resolver) This small file brings resolveLygia() which takes a string or string[] and parses it, solving all the #include dependencies into a single string you can load on your shaders.

  . npm module (online resolver) by Eduardo Fossas; vite glsl plugin (local bundle) by Ustym Ukhman. Imports .glsl local dependencies, or load inline shaders through vite.

  . esbuild glsl plugin (local bundle) by Ricardo Matias. Imports local .glsl dependencies through esbuild.

  . webpack glsl plugin (local bundle) by Ryan Grieve that imports local .glsl dependencies through webpack.

• It's very granular. One function per file. The file and the function share the same name, namely: myFunc.glsl contains myFunct(). There are some files that just include a collection of files inside a folder with the same name. For example:

    color/blend.glsl
    // which includes
    color/blend/*.glsl

• It's multi language. Right now most of is GLSL (*.glsl) and HLSL (*.hlsl), but we are slowly extending to WGSL (*.wgsl), CUDA (*.cuh) and Metal (*.msl).

    math/mirror.glsl
    math/mirror.hlsl
    math/mirror.wgsl
    math/mirror.msl
    math/mirror.cuh

• Self documented. Each file contains a structured comment (in YAML) at the top of the file. This one contains the name of the original author, description, use, and #define options

    /*
    original_author: <FULL NAME>
    description: [DESCRIPTION + URL]
    use: <vec2> myFunc(<vec2> st, <float> x [, <float> y])
    options:
        - MYFUNC_TYPE
        - MYFUNC_SAMPLER_FNC()
    */

• Prevents name collisions by using the following pattern where FNC_ is followed with the function name:

    #ifndef FNC_MYFUNC
    #define FNC_MYFUNC

    float myFunc(float in) {
        return in;
    }

    #endif

• Templating capabilities through #defines. Probably the most frequent use is templating the sampling function for reusability. The #define options start with the name of the function, in this example MYFUNC_. They are added as options: in the header.

    #ifndef MYFUNC_TYPE
    #define MYFUNC_TYPE vec4
    #endif

    #ifndef MYFUNC_SAMPLER_FNC
    #define MYFUNC_SAMPLER_FNC(TEX, UV) texture2D(TEX, UV)
    #endif

    #ifndef FNC_MYFUNC
    #define FNC_MYFUNC
    MYFUNC_TYPE myFunc(sampler2D tex, vec2 st) {
        return MYFUNC_SAMPLER_FNC(tex, st);
    }
    #endif

• Function Overloading. Arguments are arranged in such a way that optional elements are at the end. When possible sort them according their memory size (except textures that remain at the top). Ex.: sampler2D, mat4, mat3, mat2, vec4, vec3, vec2, float, ivec4, ivec3, ivec2, int, bool

    /*
    ...
    use: myFunc(<vec2> st, <vec2|float> x[, <float> y])
    */

    #ifndef FNC_MYFUNC
    #define FNC_MYFUNC
    vec2 myFunc(vec2 st, vec2 x) {
        return st * x;
    }

    vec2 myFunc(vec2 st, float x) {
        return st * x;
    }

    vec2 myFunc(vec2 st, float x, float y) {
        return st * vec2(x, y);
    }
    #endif

Contributions

LYGIA has a long way to go. Your support will be appreciated and rewarded! All contributors are automatically added to the commercial license. This support can take multiple forms:

• fixing bugs!
• expanding the cross-compatibility between languages GLSL/HLSL/MSL/WGSL/CUDA
• contributing new functions
• adding new examples and integrations for new environments like: GoDot, ISF, MaxMSP, etc.
• through sponsorships

License

LYGIA 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 (please take a look at the exceptions).

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

Exceptions:

• color/mixBox.glsl and color/mixBox.hlsl are copyrighted by Secret Weapons with their own non-commercial license. These functions also require a LUT texture which is provided for research and evaluation purposes, if you wish to obtain it together with a commercial license, please contact them at [e-mail].

Credits

Created and mantained by Patricio Gonzalez Vivo( Mastodon | Twitter | Instagram | GitHub ) and every direct or indirect contributors to the GitHub. This library has been built over years, and in many cases on top of the work of brilliant and generous people like: Inigo Quiles, Morgan McGuire, Alan Wolfe, Hugh Kennedy, Matt DesLauriers, and many others.

Get the latest news and releases

Sign up for the news letter below, join the LYGIA's channel on Discord or follow the Github repository