pixi.js/lib/filters/defaults/blur/gl/generateBlurFragSource.js

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'use strict';

var _const = require('../const.js');

"use strict";
const fragTemplate = [
  "in vec2 vBlurTexCoords[%size%];",
  "uniform sampler2D uTexture;",
  "out vec4 finalColor;",
  "void main(void)",
  "{",
  "    %blur%",
  "}"
].join("\n");
function generateBlurFragSource(kernelSize) {
  const kernel = _const.GAUSSIAN_VALUES[kernelSize];
  const halfLength = kernel.length;
  let blurLoop = "";
  const prefixFirst = "finalColor = ";
  const prefixRest = "    + ";
  const template = "texture(uTexture, vBlurTexCoords[%index%]) * %value%";
  for (let i = 0; i < kernelSize; i++) {
    const prefix = i === 0 ? prefixFirst : prefixRest;
    const value = i < halfLength ? i : kernelSize - i - 1;
    const blur = template.replace("%index%", i.toString()).replace("%value%", kernel[value].toString());
    blurLoop += `${prefix}${blur}
`;
  }
  return fragTemplate.replace("%blur%", `${blurLoop};`).replace("%size%", kernelSize.toString());
}

exports.generateBlurFragSource = generateBlurFragSource;
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