kindred-shader-formatter

Simplify authoring GLSL shaders and reduce boilerplate with a few helpful adjustments.

Usage

For example, here's a kindred-style shader:

attribute vec3 position;
attribute vec3 normal;

varying vec3 vNormal;

void vert() {
  vNormal = normal;
  gl_Position = vec4(position, 1);
}

void frag() {
  gl_FragColor = vec4(vNormal * 0.5 + 0.5, 1);
}

Both the vertex and fragment shaders are written together — removing the need to keep a duplicate list of uniforms/varyings/attributes in each file. You can pass this shader into kindred-shader-formatter to get two separate fragment and vertex shaders to pass into your WebGL library of choice.

var format = require('kindred-shader-formatter')
var glslify = require('glslify')

var formatted = format(glslify('./shader.glsl'))

console.log(formatted.vert)
console.log(formatted.frag)

This leaves you with two shaders like the following:

precision highp float;

attribute vec3 position;
attribute vec3 normal;

varying vec3 vNormal;

void vert() {
  vNormal = normal;
  gl_Position = vec4(position, 1);
}

void main() { vert(); }

precision highp float;

varying vec3 vNormal;

void frag() {
  gl_FragColor = vec4(vNormal * 0.5 + 0.5, 1);
}

void main() { frag(); }

Under the hood, we're making a few changes to your shaders:

• Vertex and fragment shaders are written as a single shader, using void vert() and void frag() respectively in place of void main().
• Attribute declarations are removed from fragment shaders.
• precision highp float; is automatically added to your shaders if not otherwise specified.
• Unused functions are automatically removed using glsl-token-function-shaker.

API

format(source)

Formats a combined shader source, returning an object with the vertex and fragment shaders as strings in vert and frag respectively.

const format = require('kindred-shader-formatter')
const Shader = require('gl-shader')

const src = format(`
  // GLSL shader goes here
`)

const shader = Shader(gl, src.vert, src.frag)

format.vert(source)

Extracts and returns only the vertex shader from source.

format.frag(source)

Extracts and returns only the fragment shader from source.

License

MIT. See LICENSE.md for details.