shader-ast-glsl

This project is part of the @thi.ng/umbrella monorepo.

• About
  • Status
  • Related packages
• Installation
• Dependencies
• Usage examples
• API
  • Basic GLSL code generation
• Authors
• License

About

GLSL code generator for @thi.ng/shader-ast. Currently supports GLSL ES 1.00 (WebGL) & GLSL ES 3.00 (WebGL 2).

This package is also used for shader assembly by @thi.ng/webgl.

Status

STABLE - used in production

Search or submit any issues for this package

Related packages

• @thi.ng/shader-ast-js - Customizable JS codegen, compiler & runtime for @thi.ng/shader-ast
• @thi.ng/shader-ast-stdlib - Function collection for modular GPGPU / shader programming with @thi.ng/shader-ast
• @thi.ng/webgl - WebGL & GLSL abstraction layer

Installation

yarn add @thi.ng/shader-ast-glsl

// ES module
<script type="module" src="https://unpkg.com/@thi.ng/shader-ast-glsl?module" crossorigin></script>

// UMD
<script src="https://unpkg.com/@thi.ng/shader-ast-glsl/lib/index.umd.js" crossorigin></script>

Package sizes (gzipped, pre-treeshake): ESM: 1.32 KB / CJS: 1.37 KB / UMD: 1.48 KB

Dependencies

• @thi.ng/api
• @thi.ng/checks
• @thi.ng/errors
• @thi.ng/shader-ast

Usage examples

Several demos in this repo's /examples directory are using this package.

A selection:

Screenshot	Description	Live demo	Source
	2D canvas shader emulation	Demo	Source
	HOF shader procedural noise function composition	Demo	Source
	WebGL & JS canvas2D raymarch shader cross-compilation	Demo	Source
	WebGL & JS canvas 2D SDF	Demo	Source
	WebGL & Canvas2D textured tunnel shader	Demo	Source
	Entity Component System w/ 100k 3D particles	Demo	Source

API

Generated API docs

Basic GLSL code generation

import { assign, defMain, output, program, uniform, vec4 } from "@thi.ng/shader-ast";
import { GLSLVersion, targetGLSL } from "@thi.ng/shader-ast-glsl";

const glsl = targetGLSL({
    // target WebGL2
    version: GLSLVersion.GLSL_300,
    // emit #version pragma
    versionPragma: true,
    // fragment shader
    type: "fs",
    // custom prelude
    prelude: `
// custom GLSL source string injection, e.g.
#define PI 3.1415926`
});

let color: Vec3Symbol;
let fragColor: Vec4Symbol;

glsl(
    program([
        color = uniform("vec3", "color"),
        fragColor = output("vec4", "fragColor", { loc: 0 }),
        defMain(()=> [
            assign(fragColor, vec4(color, 1))
        ])
    ])
)

#version 300 es

// custom GLSL source string injection, e.g.
#define PI 3.1415926
uniform vec3 color;
layout(location=0) out vec4 fragColor;
void main() {
fragColor = vec4(color, 1.0);
}

Authors

Karsten Schmidt

If this project contributes to an academic publication, please cite it as:

@misc{thing-shader-ast-glsl,
  title = "@thi.ng/shader-ast-glsl",
  author = "Karsten Schmidt",
  note = "https://thi.ng/shader-ast-glsl",
  year = 2019
}

License

© 2019 - 2021 Karsten Schmidt // Apache Software License 2.0