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

PixiJS — The HTML5 Creation Engine =============

import { GAUSSIAN_VALUES } from '../const.mjs';

"use strict";
const fragTemplate = [
  "in vec2 vBlurTexCoords[%size%];",
  "uniform sampler2D uTexture;",
  "out vec4 finalColor;",
  "void main(void)",
  "{",
  "    finalColor = vec4(0.0);",
  "    %blur%",
  "}"
].join("\n");
function generateBlurFragSource(kernelSize) {
  const kernel = GAUSSIAN_VALUES[kernelSize];
  const halfLength = kernel.length;
  let fragSource = fragTemplate;
  let blurLoop = "";
  const template = "finalColor += texture(uTexture, vBlurTexCoords[%index%]) * %value%;";
  let value;
  for (let i = 0; i < kernelSize; i++) {
    let blur = template.replace("%index%", i.toString());
    value = i;
    if (i >= halfLength) {
      value = kernelSize - i - 1;
    }
    blur = blur.replace("%value%", kernel[value].toString());
    blurLoop += blur;
    blurLoop += "\n";
  }
  fragSource = fragSource.replace("%blur%", blurLoop);
  fragSource = fragSource.replace("%size%", kernelSize.toString());
  return fragSource;
}

export { generateBlurFragSource };
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