jtBaseApp/node_modules/@cesium/engine/Source/Shaders/Builtin/Functions/unpackFloat.js

//This file is automatically rebuilt by the Cesium build process.
export default "/**\n\
 * Unpack an IEEE 754 single-precision float that is packed as a little-endian unsigned normalized vec4.\n\
 *\n\
 * @name czm_unpackFloat\n\
 * @glslFunction\n\
 *\n\
 * @param {vec4} packedFloat The packed float.\n\
 *\n\
 * @returns {float} The floating-point depth in arbitrary range.\n\
 */\n\
float czm_unpackFloat(vec4 packedFloat)\n\
{\n\
    // Convert to [0.0, 255.0] and round to integer\n\
    packedFloat = floor(packedFloat * 255.0 + 0.5);\n\
    float sign = 1.0 - step(128.0, packedFloat[3]) * 2.0;\n\
    float exponent = 2.0 * mod(packedFloat[3], 128.0) + step(128.0, packedFloat[2]) - 127.0;    \n\
    if (exponent == -127.0)\n\
    {\n\
        return 0.0;\n\
    }\n\
    float mantissa = mod(packedFloat[2], 128.0) * 65536.0 + packedFloat[1] * 256.0 + packedFloat[0] + float(0x800000);\n\
    float result = sign * exp2(exponent - 23.0) * mantissa;\n\
    return result;\n\
}\n\
";