refactor: make the whole thing more generic

modules/home-manager/desktops/hyprland/hypr/shaders/drugs.frag

@@ -0,0 +1,42 @@
+
+precision highp float;
+varying vec2 v_texcoord;
+uniform sampler2D tex;
+uniform float time;
+
+void warpco(inout vec2 tc) {
+    tc -= 0.5;
+    tc *= length(tc) * 2.0;
+    tc += 0.5;
+}
+
+float rand1d(float seed) {
+   return sin(seed*1454.0); 
+}
+
+float rand2d(vec2 co)
+{
+  return fract(sin(dot(co.xy, vec2(12.9898,78.233))) * 43758.5453);
+}
+
+vec3 rgb(in vec2 tc, float freq, float amp, inout vec4 centre) {
+    vec2 off = vec2(1.0/800.0, 0.0) * sin(tc.t * freq + time) * amp;
+    vec2 off2 = vec2(1.0/800.0, 0.0) * sin(tc.t * freq - time * 1.5) * amp;
+    centre = texture2D(tex, tc);
+    return vec3(texture2D(tex, tc-off).r, centre.g, texture2D(tex, tc+off2).b);
+}
+
+void main() {
+    // vec2 px = 1.0 / textureSize(tex, 0).st;
+    vec2 tc = v_texcoord;
+    warpco(tc);
+    tc = mix(v_texcoord, tc, sin(time * 2.0)*0.07);
+    tc.x += rand2d(floor(tc * 20.0 + floor(time * 2.5))) * 0.01;
+    tc.x += rand1d(floor(tc.x * 40.0)) * 0.005 * rand1d(time * 0.001);
+    tc.y += sin(tc.x + time) * 0.02;
+    vec4 centre;
+    vec3 bent = rgb(tc, 100.0, 5.0, centre);
+    vec3 col = mix(centre.rgb, bent, sin(time));
+    gl_FragColor = vec4(col, centre.a);
+    // gl_FragColor = vec4(texture2D(tex, v_texcoord));
+}