shader-ast-js

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

• About
  • Unsupported features
  • Status
  • Related packages
• Installation
• Dependencies
• Usage examples
• API
• Authors
• License

About

Customizable JS codegen, compiler & runtime for @thi.ng/shader-ast.

Due to the lack of native vector operations in JS, this compile target is much more involved than the @thi.ng/shader-ast-glsl code gen and uses a pluggable backend to perform all math ops. The default backend delegates all ops to @thi.ng/vectors and @thi.ng/matrices, which altogether provide ~750 optimized vector/matrix functions.

Unsupported features

• texture lookups (see texture tunnel demo for a monkey-patched solution)
• derivatives (dFdx, dFdy, fwidth) - probably never supported in this env
• out / inout function args (see #96 for discussion)

Status

STABLE - used in production

Search or submit any issues for this package

Related packages

• @thi.ng/shader-ast-glsl - Customizable GLSL codegen for @thi.ng/shader-ast
• @thi.ng/shader-ast-stdlib - Function collection for modular GPGPU / shader programming with @thi.ng/shader-ast

Installation

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

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

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

Package sizes (gzipped, pre-treeshake): ESM: 5.27 KB / CJS: 4.74 KB / UMD: 4.67 KB

Dependencies

• @thi.ng/api
• @thi.ng/checks
• @thi.ng/errors
• @thi.ng/math
• @thi.ng/matrices
• @thi.ng/pixel
• @thi.ng/shader-ast
• @thi.ng/vectors

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
	Fork-join worker-based raymarch renderer	Demo	Source

API

Generated API docs

// AST node functions from main shader-ast pkg
import {
    mul,
    defn,
    float,
    ret,
    vec3
} from "@thi.ng/shader-ast";

// codegen / compiler
import { targetJS } from "@thi.ng/shader-ast-js";

const js = targetJS();

const hello = defn("vec4", "hello", ["float"], (n) => [
    ret(vec4(mul(vec3(1, 2, 3), n), -1))
]);

js(hello)

const Module = js.compile(hello);
Module.hello(10);
// [10, 20, 30, -1]

Authors

Karsten Schmidt

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

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

License

© 2019 - 2020 Karsten Schmidt // Apache Software License 2.0