three-stdlib/shaders/KaleidoShader.cjs

stand-alone library of threejs examples

"use strict";
Object.defineProperty(exports, Symbol.toStringTag, { value: "Module" });
const KaleidoShader = {
  uniforms: {
    tDiffuse: { value: null },
    sides: { value: 6 },
    angle: { value: 0 }
  },
  vertexShader: (
    /* glsl */
    `
    varying vec2 vUv;

    void main() {

    	vUv = uv;
    	gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );

    }
  `
  ),
  fragmentShader: (
    /* glsl */
    `
    uniform sampler2D tDiffuse;
    uniform float sides;
    uniform float angle;

    varying vec2 vUv;

    void main() {

    	vec2 p = vUv - 0.5;
    	float r = length(p);
    	float a = atan(p.y, p.x) + angle;
    	float tau = 2. * 3.1416 ;
    	a = mod(a, tau/sides);
    	a = abs(a - tau/sides/2.) ;
    	p = r * vec2(cos(a), sin(a));
    	vec4 color = texture2D(tDiffuse, p + 0.5);
    	gl_FragColor = color;

    }
  `
  )
};
exports.KaleidoShader = KaleidoShader;
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