pixi.js/lib/scene/particle-container/shared/utils/createIndicesForQuads.js

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'use strict';

"use strict";
function createIndicesForQuads(size, outBuffer = null) {
  const totalIndices = size * 6;
  if (totalIndices > 65535) {
    outBuffer || (outBuffer = new Uint32Array(totalIndices));
  } else {
    outBuffer || (outBuffer = new Uint16Array(totalIndices));
  }
  if (outBuffer.length !== totalIndices) {
    throw new Error(`Out buffer length is incorrect, got ${outBuffer.length} and expected ${totalIndices}`);
  }
  for (let i = 0, j = 0; i < totalIndices; i += 6, j += 4) {
    outBuffer[i + 0] = j + 0;
    outBuffer[i + 1] = j + 1;
    outBuffer[i + 2] = j + 2;
    outBuffer[i + 3] = j + 0;
    outBuffer[i + 4] = j + 2;
    outBuffer[i + 5] = j + 3;
  }
  return outBuffer;
}

exports.createIndicesForQuads = createIndicesForQuads;
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