Webpack loader for GLSL shaders

A glsl shader loader for webpack, includes support for nested imports,
allowing for smart code reuse among more complex shader implementations.
The shader is returned as a string.

Install

``shell
npm install --save-dev webpack-glsl-loader
`

Usage

$3

> N.B. As noted in the webpack documentation, you
should avoid using this and use the configuration method in the next section.

`javascript
require('webpack-glsl!./my-lovely-shader.glsl;
``

$3

`javascript
{
module: {
loaders: [
{
test: /\.glsl$/,
loader: 'webpack-glsl'
}
]
}
}
`

and then

`javascript
require('./my-lovely-shader.glsl;
``

$3

You can also define the module extension bind on the command line if you are
not using a configuration file (you probably should be though).

`shell
webpack --module-bind 'glsl=webpack-glsl'
`

Imports

This loader supports an import syntax to allow you to maximise your code reuse
and keep those shaders
DRY. This syntax is
very similar to that of SASS.

$3

Example project structure:
`
src/
---- js/
---- ---- main.js
---- glsl/
---- ---- includes/
---- ---- ---- perlin-noise.glsl
---- ---- fragment.glsl
`

If I require my fragment shader inside main.js:

`javascript
var shader = require('../glsl/fragment.glsl');
`

I can have that shader include other .glsl files inline, like so:

`sass
@import ./includes/perlin-noise;
`

> N.B. all imports within .glsl files exclude the file extension and
are relative to the file doing the importing.

Imported files are parsed for @import statements as well, so you can nest
imports as deep as you'd like (although, you should probably rethink your
shader if you require any more than 2 levels).

Imported files are inserted directly into the source file in place of the
@import statement and no special handling or error checking is provided. So,
if you get syntax errors, please first check that shader works as one
contiguous file before raising an issue.

TODO

+ Deduplicate imports, to prevent code clobbering and conflicts at runtime
+ Make loader file extension agnostic, to allow for you odd people who use
other extensions like .vert and .frag`.