optimize-shader

A thin wrapper around glsl-optimizer for an easier JavaScript-focused API. Also includes a command-line tool for quick optimizing.

This tool is in heavy work in progress. Ultimately it would be great to integrate as a transform/through stream for glslify.

Usage

Install it globally, like so: (the native build may take a little while)

npm install optimize-shader -g

Command-line usage:

Usage: optimize-shader shader.glsl -v|-f [-t es20 -d MAX_LIGHTS:3]

Options:
  -v             vertex shader                                                
  -f             fragment shader                                              
  -t, --target   the target: gl, es20, es30   [default: "gl"]
  -d, --defines  define in KEY:value form, or a path to *.json file to include

Pass the shader, flag whether it's vertex or fragment, and additional options. You can specify target GLSL language and a list of pre-processor #define statements to inject before optimizing.

# output to file
optimize-shader PointLight.frag -f > build/PointLight.opt.frag

# specify defines like so:
optimize-shader PointLight.frag -f -t es20 -d MAX_LIGHTS:10 -d USE_GAMMA -d customDefines.json

API

If you want to use the API directly:

var optimizer = require('optimize-shader');

var result = optimizer({
    //required, source string
    source: fragSource,
    
    //required, type of shader
    type: optimizer.FRAGMENT_SHADER, 

    //optional stuff... type of target and #define injection
    defines: {
        "MAX_LIGHTS": 3
    },
    target: optimizer.TARGET_OPENGLES20
});

console.log(result.compiled); //boolean, whether it compiled successfully
console.log(result.log); //from glsl_optimizer, which isn't always reliable
console.log(result.output); //the optimized output shader

License

MIT, see LICENSE.md for details.