shader-ast-js

Note

This is one of 199 standalone projects, maintained as part of the @thi.ng/umbrella monorepo and anti-framework.

🚀 Please help me to work full-time on these projects by sponsoring me on GitHub. Thank you! ❤️

• 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/pixel - Typedarray integer & float pixel buffers w/ customizable formats, blitting, drawing, convolution
• @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

ESM import:

import * as js from "@thi.ng/shader-ast-js";

Browser ESM import:

<script type="module" src="https://esm.run/@thi.ng/shader-ast-js"></script>

JSDelivr documentation

For Node.js REPL:

const js = await import("@thi.ng/shader-ast-js");

Package sizes (brotli'd, pre-treeshake): ESM: 6.56 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

Note: @thi.ng/api is in most cases a type-only import (not used at runtime)

Usage examples

Eight projects in this repo's /examples directory are using this package:

Screenshot	Description	Live demo	Source
	ASCII art raymarching with thi.ng/shader-ast & thi.ng/text-canvas	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 (JS/CPU only)	Demo	Source
	Interactive ridge-line plot	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 - 2024 Karsten Schmidt // Apache License 2.0