@threeify/shader-transpiler

A glsl to JS module transpiler.

@threeify/shader-transpiler is glsl to JS module transpiler. It is part of the threeify ecosystem.

The purpose of this is to allow one to use raw glsl files in JavaScript in the most easy fashion possible. Keeping glsl files as \*.glsl files has the benefits that syntax highlighers work out of the box as do linters. This allows one to maximize their productivity.

Usage

``
Usage: tst [options]

Options:
-V, --version output the version number
-p, --projectDir the root of the project directory tree
-r, --rootDir the root of the source directory tree
-o, --outDir the root of the output directory tree
-w, --watch watch and incremental transpile any changed files
-j, --allowJSIncludes allow referencing javascript and typescript code via includes
-m, --minify reduce the size of the glsl code
-e, --extensions comma separated list of extensions to transpile
-v, --verboseLevel higher numbers means more output
-h, --help display help for command
`

You can also use a threeify.json configuration file in the root of your project:

`json
{
"glsl": {
"rootDir": "./src",
"outDir": "./dist",
"extensions": ["glsl", "frag", "vert"],
"minify": true,
"allowJSIncludes": true,
"verboseLevel": 0
}
}
`

$3

Just run it to transform all glsl files from the input directory into the corresponding
glsl.js JavaScript modules in the output directory.

`
npm run start -p ../threeify
`

$3

To have the transpiler constantly run and transpile files incrementally on change use the watch option:

`
npm run -p ../threeify -w
`

Features

- Allow you to keep your glsl files in raw glsl.
- Convert glsl files into JavaScript modules.
- Mix JS generated glsl with raw glsl files.
- Support "#pragma once" include guard creation.
- Incremental updates when in watch mode.

Example

An original rgbe.glsl file:

`glsl
#pragma once
#pragma include "../../math/math.glsl"

vec4 rgbeToLinear( in vec4 value ) {
return vec4( value.rgb exp2( value.a 255.0 - 128.0 ), 1.0 );
}

vec4 linearToRGBE( in vec4 value ) {
float maxComponent = max( max( value.r, value.g ), value.b );
float fExp = clamp( ceil( log2( maxComponent ) ), -128.0, 127.0 );
return vec4( value.rgb / exp2( fExp ), ( fExp + 128.0 ) / 255.0 );
}
`

Will be transformed into a rgbe.glsl.js JavaScript module:

`javascript
import _renderers_webgl2_shaders_includes_math_math_glsl from "../../math/math.glsl.js";

export default / glsl /
#ifndef _renderers_webgl2_shaders_includes_color_spaces_rgbe_glsl // start of include guard
#define _renderers_webgl2_shaders_includes_color_spaces_rgbe_glsl

${_renderers_webgl2_shaders_includes_math_math_glsl}

vec4 rgbeToLinear( in vec4 value ) {
return vec4( value.rgb exp2( value.a 255.0 - 128.0 ), 1.0 );
}

vec4 linearToRGBE( in vec4 value ) {
float maxComponent = max( max( value.r, value.g ), value.b );
float fExp = clamp( ceil( log2( maxComponent ) ), -128.0, 127.0 );
return vec4( value.rgb / exp2( fExp ), ( fExp + 128.0 ) / 255.0 );
}

#endif // end of include guard
;
`

Which you can use in your JavaScript code via:

`javascript
import rgbe_code from "rgbe.glsl.js";

console.log(rgbe_cole);
``