@arcgis/core
Version:
ArcGIS Maps SDK for JavaScript: A complete 2D and 3D mapping and data visualization API
22 lines (21 loc) • 912 B
JavaScript
/* COPYRIGHT Esri - https://js.arcgis.com/5.0.8/LICENSE.txt */
import{glsl as o}from"../../shaderModules/glsl.js";function a(a){a.code.add(o`const float MAX_RGBA_FLOAT =
255.0 / 256.0 +
255.0 / 256.0 / 256.0 +
255.0 / 256.0 / 256.0 / 256.0 +
255.0 / 256.0 / 256.0 / 256.0 / 256.0;
const vec4 FIXED_POINT_FACTORS = vec4(1.0, 256.0, 256.0 * 256.0, 256.0 * 256.0 * 256.0);
vec4 floatToRgba(const float value) {
float valueInValidDomain = clamp(value, 0.0, MAX_RGBA_FLOAT);
vec4 fixedPointU8 = floor(fract(valueInValidDomain * FIXED_POINT_FACTORS) * 256.0);
const float toU8AsFloat = 1.0 / 255.0;
return fixedPointU8 * toU8AsFloat;
}`),a.code.add(o`const vec4 RGBA_TO_FLOAT_FACTORS = vec4(
255.0 / (256.0),
255.0 / (256.0 * 256.0),
255.0 / (256.0 * 256.0 * 256.0),
255.0 / (256.0 * 256.0 * 256.0 * 256.0)
);
float rgbaToFloat(vec4 rgba) {
return dot(rgba, RGBA_TO_FLOAT_FACTORS);
}`)}export{a as RgbaFloatEncoding};