three-stdlib/shaders/HueSaturationShader.cjs.map

stand-alone library of threejs examples

{"version":3,"file":"HueSaturationShader.cjs","sources":["../../src/shaders/HueSaturationShader.ts"],"sourcesContent":["/**\n * Hue and saturation adjustment\n * https://github.com/evanw/glfx.js\n * hue: -1 to 1 (-1 is 180 degrees in the negative direction, 0 is no change, etc.\n * saturation: -1 to 1 (-1 is solid gray, 0 is no change, and 1 is maximum contrast)\n */\n\nexport const HueSaturationShader = {\n  uniforms: {\n    tDiffuse: { value: null },\n    hue: { value: 0 },\n    saturation: { value: 0 },\n  },\n\n  vertexShader: [\n    'varying vec2 vUv;',\n\n    'void main() {',\n\n    '\tvUv = uv;',\n\n    '\tgl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );',\n\n    '}',\n  ].join('\\n'),\n\n  fragmentShader: [\n    'uniform sampler2D tDiffuse;',\n    'uniform float hue;',\n    'uniform float saturation;',\n\n    'varying vec2 vUv;',\n\n    'void main() {',\n\n    '\tgl_FragColor = texture2D( tDiffuse, vUv );',\n\n    // hue\n    '\tfloat angle = hue * 3.14159265;',\n    '\tfloat s = sin(angle), c = cos(angle);',\n    '\tvec3 weights = (vec3(2.0 * c, -sqrt(3.0) * s - c, sqrt(3.0) * s - c) + 1.0) / 3.0;',\n    '\tfloat len = length(gl_FragColor.rgb);',\n    '\tgl_FragColor.rgb = vec3(',\n    '\t\tdot(gl_FragColor.rgb, weights.xyz),',\n    '\t\tdot(gl_FragColor.rgb, weights.zxy),',\n    '\t\tdot(gl_FragColor.rgb, weights.yzx)',\n    '\t);',\n\n    // saturation\n    '\tfloat average = (gl_FragColor.r + gl_FragColor.g + gl_FragColor.b) / 3.0;',\n    '\tif (saturation > 0.0) {',\n    '\t\tgl_FragColor.rgb += (average - gl_FragColor.rgb) * (1.0 - 1.0 / (1.001 - saturation));',\n    '\t} else {',\n    '\t\tgl_FragColor.rgb += (average - gl_FragColor.rgb) * (-saturation);',\n    '\t}',\n\n    '}',\n  ].join('\\n'),\n}\n"],"names":[],"mappings":";;AAOO,MAAM,sBAAsB;AAAA,EACjC,UAAU;AAAA,IACR,UAAU,EAAE,OAAO,KAAK;AAAA,IACxB,KAAK,EAAE,OAAO,EAAE;AAAA,IAChB,YAAY,EAAE,OAAO,EAAE;AAAA,EACzB;AAAA,EAEA,cAAc;AAAA,IACZ;AAAA,IAEA;AAAA,IAEA;AAAA,IAEA;AAAA,IAEA;AAAA,EAAA,EACA,KAAK,IAAI;AAAA,EAEX,gBAAgB;AAAA,IACd;AAAA,IACA;AAAA,IACA;AAAA,IAEA;AAAA,IAEA;AAAA,IAEA;AAAA;AAAA,IAGA;AAAA,IACA;AAAA,IACA;AAAA,IACA;AAAA,IACA;AAAA,IACA;AAAA,IACA;AAAA,IACA;AAAA,IACA;AAAA;AAAA,IAGA;AAAA,IACA;AAAA,IACA;AAAA,IACA;AAAA,IACA;AAAA,IACA;AAAA,IAEA;AAAA,EAAA,EACA,KAAK,IAAI;AACb;;"}