threepipe/lib/utils/shader-helpers.js

A 3D viewer framework built on top of three.js in TypeScript with a focus on quality rendering, modularity and extensibility.

const warnEnabled = true;
const errorStr1 = 'shaderReplaceString: str must be passed if str is a RegExp and append/prepend is true';
/**
 * Replace a string in a shader function with added options to prepend, append, show warning when not found, and replace all occurrences.
 * @param shader - shader code
 * @param str - string to replace
 * @param newStr - new string to replace with
 * @param replaceAll - replace all occurrences
 * @param prepend - prepend new string to old string
 * @param append - append new string to old string
 * @param _str - optional string to use for replacement. This must be passed if str is a RegExp and append/prepend is true
 */
export function shaderReplaceString(shader, str, newStr, { replaceAll = false, prepend = false, append = false, str: _str = undefined, } = {}) {
    // todo: use safeReplaceString from ts-browser-helpers
    const isStr = typeof str === 'string';
    if (warnEnabled /* && ThreeViewer.ViewerDebugging */) {
        if (isStr ? !shader.includes(str) : !str.test(shader)) {
            console.error(`${str} not found in shader`);
            return shader;
        }
    }
    let s = newStr;
    _str = _str ?? (isStr ? str : undefined);
    if (prepend) {
        if (typeof _str !== 'string')
            throw new Error(errorStr1);
        s = newStr + _str;
    }
    else if (append) {
        if (typeof _str !== 'string')
            throw new Error(errorStr1);
        s = _str + newStr;
    }
    return replaceAll ? shader.replaceAll(str, s) : shader.replace(str, s);
}
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