@luma.gl/effects/dist/es6/shader-modules/blur-filters/zoomblur.js

Rendering and post-processing effects library for luma.gl

import random from '../utils/random';
const fs = "\nuniform vec2 center;\nuniform float strength;\n\nvec4 zoomBlur_sampleColor(sampler2D texture, vec2 texSize, vec2 texCoord) {\n  vec4 color = vec4(0.0);\n  float total = 0.0;\n  vec2 toCenter = center * texSize - texCoord * texSize;\n\n  /* randomize the lookup values to hide the fixed number of samples */\n  float offset = random(vec3(12.9898, 78.233, 151.7182), 0.0);\n\n  for (float t = 0.0; t <= 40.0; t++) {\n    float percent = (t + offset) / 40.0;\n    float weight = 4.0 * (percent - percent * percent);\n    vec4 sample = texture2D(texture, texCoord + toCenter * percent * strength / texSize);\n\n    /* switch to pre-multiplied alpha to correctly blur transparent images */\n    sample.rgb *= sample.a;\n\n    color += sample * weight;\n    total += weight;\n  }\n\n  color = color / total;\n\n  /* switch back from pre-multiplied alpha */\n  color.rgb /= color.a + 0.00001;\n\n  return color;\n}\n";
const uniforms = {
  center: [0.5, 0.5],
  strength: {
    value: 0.3,
    min: 0,
    softMax: 1
  }
};
export default {
  name: 'zoomBlur',
  uniforms,
  fs,
  dependencies: [random],
  passes: [{
    sampler: true
  }]
};
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