three-stdlib/shaders/ToneMapShader.js

stand-alone library of threejs examples

const ToneMapShader = {
  uniforms: {
    tDiffuse: { value: null },
    averageLuminance: { value: 1 },
    luminanceMap: { value: null },
    maxLuminance: { value: 16 },
    minLuminance: { value: 0.01 },
    middleGrey: { value: 0.6 }
  },
  vertexShader: [
    "varying vec2 vUv;",
    "void main() {",
    "	vUv = uv;",
    "	gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );",
    "}"
  ].join("\n"),
  fragmentShader: [
    "#include <common>",
    "uniform sampler2D tDiffuse;",
    "varying vec2 vUv;",
    "uniform float middleGrey;",
    "uniform float minLuminance;",
    "uniform float maxLuminance;",
    "#ifdef ADAPTED_LUMINANCE",
    "	uniform sampler2D luminanceMap;",
    "#else",
    "	uniform float averageLuminance;",
    "#endif",
    "vec3 ToneMap( vec3 vColor ) {",
    "	#ifdef ADAPTED_LUMINANCE",
    // Get the calculated average luminance
    "		float fLumAvg = texture2D(luminanceMap, vec2(0.5, 0.5)).r;",
    "	#else",
    "		float fLumAvg = averageLuminance;",
    "	#endif",
    // Calculate the luminance of the current pixel
    "	float fLumPixel = linearToRelativeLuminance( vColor );",
    // Apply the modified operator (Eq. 4)
    "	float fLumScaled = (fLumPixel * middleGrey) / max( minLuminance, fLumAvg );",
    "	float fLumCompressed = (fLumScaled * (1.0 + (fLumScaled / (maxLuminance * maxLuminance)))) / (1.0 + fLumScaled);",
    "	return fLumCompressed * vColor;",
    "}",
    "void main() {",
    "	vec4 texel = texture2D( tDiffuse, vUv );",
    "	gl_FragColor = vec4( ToneMap( texel.xyz ), texel.w );",
    "}"
  ].join("\n")
};
export {
  ToneMapShader
};
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