This shader adapted from the Book of Shaders works in a shader image generator – but how can I use the workaround from this bug report to add mouse input? (That is, replace u_mouse with a port for mouse input)?
// Author @patriciogv - 2015
// https://thebookofshaders.com/edit.php#10/ikeda-03.frag
// Title: Ikeda Data Stream
float random (in float x) {
return fract(sin(x)*1e4);
}
float random (in vec2 st) {
return fract(sin(dot(st.xy, vec2(12.9898,78.233)))* 43758.5453123);
}
float pattern(vec2 st, vec2 v, float t) {
vec2 p = floor(st+v);
return step(t, random(100.+p*.000001)+random(p.x)*0.5 );
}
void main() {
vec2 st = gl_FragCoord.xy/RENDERSIZE.xy;
st.x *= RENDERSIZE.x/RENDERSIZE.y;
vec2 grid = vec2(100.0,50.);
st *= grid;
vec2 ipos = floor(st); // integer
vec2 fpos = fract(st); // fraction
vec2 vel = vec2(TIME*2.*max(grid.x,grid.y)); // time
vel *= vec2(-1.,0.0) * random(1.0+ipos.y); // direction
// Assign a random value base on the integer coord
vec2 offset = vec2(0.1,0.);
// how can u_mouse be changed to mouse input port in Vuo?
vec2 u_mouse = vec2(100.0,100.0);
vec3 color = vec3(0.);
color.r = pattern(st+offset,vel,0.5 + u_mouse.x/RENDERSIZE.x);
color.g = pattern(st,vel,0.5 + u_mouse.x/RENDERSIZE.x);
color.b = pattern(st-offset,vel,0.5 + u_mouse.x/RENDERSIZE.x);
// Margins
color *= step(0.2,fpos.y);
gl_FragColor = vec4(1.0-color,1.0);
}