55 lines
1.1 KiB
JavaScript
55 lines
1.1 KiB
JavaScript
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/**
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* RGB Shift Shader
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* Shifts red and blue channels from center in opposite directions
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* Ported from https://web.archive.org/web/20090820185047/http://kriss.cx/tom/2009/05/rgb-shift/
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* by Tom Butterworth / https://web.archive.org/web/20090810054752/http://kriss.cx/tom/
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*
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* amount: shift distance (1 is width of input)
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* angle: shift angle in radians
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*/
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const RGBShiftShader = {
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name: 'RGBShiftShader',
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uniforms: {
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'tDiffuse': { value: null },
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'amount': { value: 0.005 },
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'angle': { value: 0.0 }
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},
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vertexShader: /* glsl */`
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varying vec2 vUv;
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void main() {
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vUv = uv;
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gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );
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}`,
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fragmentShader: /* glsl */`
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uniform sampler2D tDiffuse;
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uniform float amount;
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uniform float angle;
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varying vec2 vUv;
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void main() {
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vec2 offset = amount * vec2( cos(angle), sin(angle));
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vec4 cr = texture2D(tDiffuse, vUv + offset);
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vec4 cga = texture2D(tDiffuse, vUv);
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vec4 cb = texture2D(tDiffuse, vUv - offset);
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gl_FragColor = vec4(cr.r, cga.g, cb.b, cga.a);
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}`
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};
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export { RGBShiftShader };
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