kepler.gl
Version:
kepler.gl is a webgl based application to visualize large scale location data in the browser
42 lines (40 loc) • 4.49 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.saturation = void 0;
// SPDX-License-Identifier: MIT
// Copyright contributors to the kepler.gl project
/**
* Adjusts the saturation of a color.
* From cesium:
* https://github.com/CesiumGS/cesium/blob/master/Source/Shaders/Builtin/Functions/saturation.glsl
*
* @param {vec3} rgb The color.
* @param {float} adjustment The amount to adjust the saturation of the color. Usually between 0 and 2.
*
* @returns {vec3} The color with the saturation adjusted.
*/
var fs = "uniform saturationUniforms {\n float value;\n} saturation;\n\nvec3 saturate(vec3 rgb, float adjustment) {\n // Algorithm from Chapter 16 of OpenGL Shading Language\n const vec3 W = vec3(0.2125, 0.7154, 0.0721);\n vec3 intensity = vec3(dot(rgb, W));\n return mix(intensity, rgb, adjustment);\n}\n";
function getUniforms() {
var opts = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};
var saturationValue = opts.saturationValue;
if (!saturationValue) {
return null;
}
return {
value: Number.isFinite(saturationValue) ? saturationValue : 1
};
}
var saturation = exports.saturation = {
name: 'saturation',
fs: fs,
uniformTypes: {
value: 'f32'
},
getUniforms: getUniforms,
inject: {
'fs:DECKGL_MUTATE_COLOR': "\n image = vec4(saturate(image.rgb, saturation.value), image.a);\n "
}
};
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