[New Shader] - Freeze shader

Author: Rahiche

source/shaders/freeze/freeze.mp4

@@ -0,0 +1,56 @@
+---
+description: A shader that simulates a progressive freezing effect, creating a transition from normal to frozen state.
+shader:
+  title: Freeze
+  description: This shader progressively simulates a freezing effect on the screen
+  screenshot: freeze.png
+  video: freeze.mp4
+# For the moment we need to record the path to this directory until Static Shock provides this
+directory: shaders/freeze/
+---
+```glsl
+// based on https://www.shadertoy.com/view/MsySzy
+// Experiment: Frosted Glass II by Shadmar
+// Original by Jack Davenport : https://www.shadertoy.com/view/MtsSWs#
+
+#version 460 core
+
+precision mediump float;
+
+#include <flutter/runtime_effect.glsl>
+
+uniform vec2 iResolution;
+uniform float progress;
+uniform sampler2D image;
+
+out vec4 fragColor;
+
+#define FROSTYNESS 2.0
+#define COLORIZE   1.0
+#define COLOR_RGB  0.7,1.0,1.0
+
+float rand(vec2 uv) {
+
+    float a = dot(uv, vec2(92., 80.));
+    float b = dot(uv, vec2(41., 62.));
+
+    float x = sin(a) + cos(b) * 51.;
+    return fract(x);
+}
+
+void main( ) {
+    vec2 fragCoord = FlutterFragCoord().xy;
+    vec2 uv = fragCoord.xy / iResolution.xy;
+    vec4 d = texture(image, uv);
+    vec2 rnd = vec2(rand(uv+d.r*.05), rand(uv+d.b*.05));
+
+    //vignette
+    vec2 lensRadius = vec2(progress, 0.05);
+    float dist = distance(uv.xy, vec2(0.5,0.5));
+    float vigfin = pow(1.-smoothstep(lensRadius.x, lensRadius.y, dist),2.);
+
+    rnd *= .025*vigfin+d.rg*FROSTYNESS*vigfin;
+    uv += rnd;
+    fragColor = mix(texture(image, uv),vec4(COLOR_RGB,1.0),COLORIZE*vec4(rnd.r));
+}
+```