pixi.js/lib/rendering/renderers/gl/shader/program/preprocessors/ensurePrecision.js

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'use strict';

"use strict";
function ensurePrecision(src, options, isFragment) {
  const maxSupportedPrecision = isFragment ? options.maxSupportedFragmentPrecision : options.maxSupportedVertexPrecision;
  if (src.substring(0, 9) !== "precision") {
    let precision = isFragment ? options.requestedFragmentPrecision : options.requestedVertexPrecision;
    if (precision === "highp" && maxSupportedPrecision !== "highp") {
      precision = "mediump";
    }
    return `precision ${precision} float;
${src}`;
  } else if (maxSupportedPrecision !== "highp" && src.substring(0, 15) === "precision highp") {
    return src.replace("precision highp", "precision mediump");
  }
  return src;
}

exports.ensurePrecision = ensurePrecision;
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