bun-plugin-glsl/build/index.js

Import, inline (and minify) GLSL/WGSL shader files

// @bun
// plugin/src/loadShader.js
import { dirname, resolve, extname, posix, sep } from "path";
import { emitWarning, cwd } from "process";
import { readFileSync } from "fs";
import { platform } from "os";
var recursiveChunk = "";
var allChunks = new Set;
var dependentChunks = new Map;
var duplicatedChunks = new Map;
function resetSavedChunks() {
  const chunk = recursiveChunk;
  duplicatedChunks.clear();
  dependentChunks.clear();
  recursiveChunk = "";
  allChunks.clear();
  return chunk;
}
function getRecursionCaller() {
  const dependencies = [...dependentChunks.keys()];
  return dependencies[dependencies.length - 1];
}
function checkDuplicatedImports(path) {
  const caller = getRecursionCaller();
  const chunks = duplicatedChunks.get(caller) ?? [];
  if (chunks.includes(path))
    return;
  chunks.push(path);
  duplicatedChunks.set(caller, chunks);
  emitWarning(`'${path}' was included multiple times.`, {
    code: "vite-plugin-glsl",
    detail: "Please avoid multiple imports of the same chunk in order to avoid" + ` recursions and optimize your shader length.
Duplicated import found in file '${caller}'.`
  });
}
function removeSourceComments(source, keyword, triple = false) {
  const pattern = new RegExp(String.raw`${keyword}(\s+([^\s<>]+));?`, "gi");
  if (source.includes("/*") && source.includes("*/")) {
    source = source.slice(0, source.indexOf("/*")) + source.slice(source.indexOf("*/") + 2, source.length);
  }
  const lines = source.split(`
`);
  for (let l = lines.length;l--; ) {
    const index = lines[l].indexOf("//");
    if (index > -1) {
      if (lines[l][index + 2] === "/" && !pattern.test(lines[l]) && !triple)
        continue;
      lines[l] = lines[l].slice(0, lines[l].indexOf("//"));
    }
  }
  return lines.join(`
`);
}
function checkRecursiveImports(path, lowPath, warn, ignore) {
  if (allChunks.has(lowPath)) {
    if (ignore)
      return null;
    warn && checkDuplicatedImports(path);
  }
  return checkIncludedDependencies(path, path);
}
function checkIncludedDependencies(path, root) {
  const dependencies = dependentChunks.get(path);
  let recursiveDependency = false;
  if (dependencies?.includes(root)) {
    recursiveChunk = root;
    return true;
  }
  dependencies?.forEach((dependency) => recursiveDependency ||= checkIncludedDependencies(dependency, root));
  return recursiveDependency;
}
function minifyShader(shader, newLine = false) {
  const getAllCharIndexes = (line, char = "-", start = 0) => {
    const indexes = [];
    while ((start = line.indexOf(char, start)) !== -1)
      indexes.push(start++);
    return indexes;
  };
  return shader.replace(/\\(?:\r\n|\n\r|\n|\r)|\/\*.*?\*\/|\/\/(?:\\(?:\r\n|\n\r|\n|\r)|[^\n\r])*/g, "").split(/\n+/).reduce((result, line) => {
    line = line.trim().replace(/\s{2,}|\t/, " ");
    if (/@(vertex|fragment|compute)/.test(line) || line.endsWith("return"))
      line += " ";
    if (line[0] === "#") {
      newLine && result.push(`
`);
      result.push(line, `
`);
      newLine = false;
    } else {
      !line.startsWith("{") && result.length && result[result.length - 1].endsWith("else") && result.push(" ");
      line = line.replace(/\s*({|}|=|\*|,|\+|\/|>|<|&|\||\[|\]|\(|\)|!|;)\s*/g, "$1");
      const indexes = getAllCharIndexes(line);
      indexes.forEach((index) => {
        if (line[index - 1] === " " && line[index - 2] !== "-")
          line = `${line.slice(0, index - 1)}${line.slice(index--)}`;
        if (line[index + 1] === " " && line[index + 2] !== "-")
          line = `${line.slice(0, index + 1)}${line.slice(index + 2)}`;
      });
      result.push(line);
      newLine = true;
    }
    return result;
  }, []).join("").replace(/\n+/g, `
`);
}
function loadChunks(source, path, options) {
  const { importKeyword, warnDuplicatedImports, removeDuplicatedImports } = options;
  const pattern = new RegExp(String.raw`${importKeyword}(\s+([^\s<>]+));?`, "gi");
  const unixPath = path.split(sep).join(posix.sep);
  const chunkPath = platform() === "win32" && unixPath.toLocaleLowerCase() || unixPath;
  const recursion = checkRecursiveImports(unixPath, chunkPath, warnDuplicatedImports, removeDuplicatedImports);
  if (recursion)
    return recursiveChunk;
  else if (recursion === null)
    return "";
  source = removeSourceComments(source);
  let directory = dirname(unixPath);
  allChunks.add(chunkPath);
  if (pattern.test(source)) {
    dependentChunks.set(unixPath, []);
    const currentDirectory = directory;
    const ext = options.defaultExtension;
    source = source.replace(pattern, (_, chunkPath2) => {
      chunkPath2 = chunkPath2.trim().replace(/^(?:"|')?|(?:"|')?;?$/gi, "");
      if (!chunkPath2.indexOf("/")) {
        const base = cwd().split(sep).join(posix.sep);
        chunkPath2 = base + options.root + chunkPath2;
      }
      const directoryIndex = chunkPath2.lastIndexOf("/");
      directory = currentDirectory;
      if (directoryIndex !== -1) {
        directory = resolve(directory, chunkPath2.slice(0, directoryIndex + 1));
        chunkPath2 = chunkPath2.slice(directoryIndex + 1, chunkPath2.length);
      }
      let shader = resolve(directory, chunkPath2);
      if (!extname(shader))
        shader = `${shader}.${ext}`;
      const shaderPath = shader.split(sep).join(posix.sep);
      dependentChunks.get(unixPath)?.push(shaderPath);
      return loadChunks(readFileSync(shader, "utf8"), shader, options);
    });
  }
  if (recursiveChunk) {
    const caller = getRecursionCaller();
    const recursiveChunk2 = resetSavedChunks();
    throw new Error(`Recursion detected when importing "${recursiveChunk2}" in "${caller}".`);
  }
  return source.trim().replace(/(\r\n|\r|\n){3,}/g, `$1
`);
}
async function loadShader_default(source, shader, options) {
  const { minify, ...config } = options;
  resetSavedChunks();
  let output = loadChunks(source, shader, config);
  output = minify ? removeSourceComments(output, options.importKeyword, true) : output;
  return {
    dependentChunks,
    outputShader: minify ? typeof minify !== "function" ? minifyShader(output) : await minify(output) : output
  };
}

// src/index.ts
function src_default({
  include = /\.(glsl|wgsl|vert|frag|vs|fs)$/,
  removeDuplicatedImports = false,
  warnDuplicatedImports = true,
  defaultExtension = "glsl",
  importKeyword = "#include",
  minify = false,
  root = "/"
} = {}) {
  return {
    name: "bun-plugin-glsl",
    setup(build) {
      build.onLoad({ filter: include }, async (args) => {
        const source = await Bun.file(args.path).text();
        const { outputShader } = await loadShader_default(source, args.path, {
          removeDuplicatedImports,
          warnDuplicatedImports,
          defaultExtension,
          importKeyword,
          minify,
          root
        });
        return {
          exports: { default: outputShader },
          loader: "object"
        };
      });
    }
  };
}
export {
  src_default as default
};