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/**
* RGB Shift Shader
* Shifts red and blue channels from center in opposite directions
* Ported from http://kriss.cx/tom/2009/05/rgb-shift/
* by Tom Butterworth / http://kriss.cx/tom/
*
* amount: shift distance (1 is width of input)
* angle: shift angle in radians
*/
const DigitalGlitch = {
uniforms: {
'tDiffuse': { value: null }, //diffuse texture
'tDisp': { value: null }, //displacement texture for digital glitch squares
'byp': { value: 0 }, //apply the glitch ?
'amount': { value: 0.08 },
'angle': { value: 0.02 },
'seed': { value: 0.02 },
'seed_x': { value: 0.02 }, //-1,1
'seed_y': { value: 0.02 }, //-1,1
'distortion_x': { value: 0.5 },
'distortion_y': { value: 0.6 },
'col_s': { value: 0.05 }
},
vertexShader: /* glsl */`
varying vec2 vUv;
void main() {
vUv = uv;
gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );
}`,
fragmentShader: /* glsl */`
uniform int byp; //should we apply the glitch ?
uniform sampler2D tDiffuse;
uniform sampler2D tDisp;
uniform float amount;
uniform float angle;
uniform float seed;
uniform float seed_x;
uniform float seed_y;
uniform float distortion_x;
uniform float distortion_y;
uniform float col_s;
varying vec2 vUv;
float rand(vec2 co){
return fract(sin(dot(co.xy ,vec2(12.9898,78.233))) * 43758.5453);
}
void main() {
if(byp<1) {
vec2 p = vUv;
float xs = floor(gl_FragCoord.x / 0.5);
float ys = floor(gl_FragCoord.y / 0.5);
//based on staffantans glitch shader for unity https://github.com/staffantan/unityglitch
float disp = texture2D(tDisp, p*seed*seed).r;
if(p.y<distortion_x+col_s && p.y>distortion_x-col_s*seed) {
if(seed_x>0.){
p.y = 1. - (p.y + distortion_y);
}
else {
p.y = distortion_y;
}
}
if(p.x<distortion_y+col_s && p.x>distortion_y-col_s*seed) {
if(seed_y>0.){
p.x=distortion_x;
}
else {
p.x = 1. - (p.x + distortion_x);
}
}
p.x+=disp*seed_x*(seed/5.);
p.y+=disp*seed_y*(seed/5.);
//base from RGB shift shader
vec2 offset = amount * vec2( cos(angle), sin(angle));
vec4 cr = texture2D(tDiffuse, p + offset);
vec4 cga = texture2D(tDiffuse, p);
vec4 cb = texture2D(tDiffuse, p - offset);
gl_FragColor = vec4(cr.r, cga.g, cb.b, cga.a);
//add noise
vec4 snow = 200.*amount*vec4(rand(vec2(xs * seed,ys * seed*50.))*0.2);
gl_FragColor = gl_FragColor+ snow;
}
else {
gl_FragColor=texture2D (tDiffuse, vUv);
}
}`
};
export { DigitalGlitch };