cesiumDemo/Source/Scene/getClipAndStyleCode.js

import Check from '../Core/Check.js';

    /**
     * Gets a GLSL snippet that clips a fragment using the `clip` function from {@link getClippingFunction} and styles it.
     *
     * @param {String} samplerUniformName Name of the uniform for the clipping planes texture sampler.
     * @param {String} matrixUniformName Name of the uniform for the clipping planes matrix.
     * @param {String} styleUniformName Name of the uniform for the clipping planes style, a vec4.
     * @returns {String} A string containing GLSL that clips and styles the current fragment.
     * @private
     */
    function getClipAndStyleCode(samplerUniformName, matrixUniformName, styleUniformName) {
        //>>includeStart('debug', pragmas.debug);
        Check.typeOf.string('samplerUniformName', samplerUniformName);
        Check.typeOf.string('matrixUniformName', matrixUniformName);
        Check.typeOf.string('styleUniformName', styleUniformName);
        //>>includeEnd('debug');

        var shaderCode =
        '    float clipDistance = clip(gl_FragCoord, ' + samplerUniformName + ', ' + matrixUniformName + '); \n' +
        '    vec4 clippingPlanesEdgeColor = vec4(1.0); \n' +
        '    clippingPlanesEdgeColor.rgb = ' + styleUniformName + '.rgb; \n' +
        '    float clippingPlanesEdgeWidth = ' + styleUniformName + '.a; \n' +
        '    if (clipDistance > 0.0 && clipDistance < clippingPlanesEdgeWidth) \n' +
        '    { \n' +
        '        gl_FragColor = clippingPlanesEdgeColor;\n' +
        '    } \n';
        return shaderCode;
    }
export default getClipAndStyleCode;