You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
59 lines
1014 B
59 lines
1014 B
6 months ago
|
/**
|
||
|
|
* Kaleidoscope Shader
|
||
|
|
* Radial reflection around center point
|
||
|
|
* Ported from: http://pixelshaders.com/editor/
|
||
|
|
* by Toby Schachman / http://tobyschachman.com/
|
||
|
|
*
|
||
|
|
* sides: number of reflections
|
||
|
|
* angle: initial angle in radians
|
||
|
|
*/
|
||
|
|
|
||
|
|
const KaleidoShader = {
|
||
|
|
|
||
|
|
name: 'KaleidoShader',
|
||
|
|
|
||
|
|
uniforms: {
|
||
|
|
|
||
|
|
'tDiffuse': { value: null },
|
||
|
|
'sides': { value: 6.0 },
|
||
|
|
'angle': { value: 0.0 }
|
||
|
|
|
||
|
|
},
|
||
|
|
|
||
|
|
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;
|
||
|
|
|
||
|
|
}`
|
||
|
|
|
||
|
|
};
|
||
|
|
|
||
|
|
export { KaleidoShader };
|