refactor: make the whole thing more generic

modules/home-manager/desktops/hyprland/hypr/shaders/motion-blur.frag

@@ -0,0 +1,28 @@
+// vim: set ft=glsl:
+
+precision mediump float;
+varying vec2 v_texcoord;
+uniform sampler2D tex;
+uniform float blurFactor;
+uniform vec2 resolution;
+
+const int numSamples = 120000;
+
+uniform sampler2D accumulator;
+
+void main() {
+    float blurFactor = 120000.0;
+
+    vec4 currentColor = texture2D(tex, v_texcoord);
+    vec4 prevColor = texture2D(accumulator, v_texcoord);
+
+    vec2 velocity = (v_texcoord - gl_FragCoord.xy / resolution) * 2.0;
+
+    vec4 colorDiff = currentColor - prevColor;
+
+    float motionBlur = length(velocity) * blurFactor;
+
+    vec4 finalColor = prevColor + colorDiff * 2.0;
+
+    gl_FragColor = finalColor;
+}