three-stdlib/shaders/LuminosityShader.js

stand-alone library of threejs examples

const LuminosityShader = {
  uniforms: {
    tDiffuse: { value: null }
  },
  vertexShader: (
    /* glsl */
    `
    varying vec2 vUv;

    void main() {

    	vUv = uv;

    	gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );

    }
  `
  ),
  fragmentShader: (
    /* glsl */
    `
    #include <common>

    uniform sampler2D tDiffuse;

    varying vec2 vUv;

    void main() {

    	vec4 texel = texture2D( tDiffuse, vUv );

    	float l = linearToRelativeLuminance( texel.rgb );

    	gl_FragColor = vec4( l, l, l, texel.w );

    }
  `
  )
};
export {
  LuminosityShader
};
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