Updates

water/water.frag

@@ -8,6 +8,21 @@ uniform float renderTargetFlipping;
 uniform vec4 viewportSize;
 uniform f32vec4 cameraPosition;
 )
+float rand(float n){return fract(sin(n) * 43758.5453123);}
+float rand2(vec2 n) {
+	return fract(sin(dot(n, vec2(12.9898, 4.1414))) * 43758.5453);
+}
+float noise(vec2 n) {
+	const vec2 d = vec2(0.0, 1.0);
+  vec2 b = floor(n), f = smoothstep(vec2(0.0), vec2(1.0), fract(n));
+  float fx = f.x;
+  vec2 e = b + d.yx;
+  float m = mix(rand2(b), rand2(e), fx);
+  vec2 p = b + d.xy;
+  vec2 q = b + d.yy;
+  float r = mix(rand2(p), rand2(q), f.y);
+	return mix(m, r, fx);
+}
 MAIN_PARAMETERS
 IN(f32vec3 positionWS, TEXCOORD0)
 IN(f32vec3 vnormal, TEXCOORD1)
@@ -21,9 +36,12 @@ MAIN_DECLARATION
 #else
 	screenUV.y = screenUV.y * 0.6 + 0.2;
 #endif
+
 	float depth = saturate(length(positionWS - cameraPosition.xyz) * 0.01);
-	vec4 reflectionColour = texture2D(reflectMap, screenUV * vec2(0.5, 1.0));
-	vec4 refractionColour = texture2D(reflectMap, screenUV * vec2(0.5, 1.0) + vec2(0.5, 0.0));
+	float nx = sin(noise(vec2(1300.0 + screenUV.x * 48.11, 1100.0 + screenUV.y)));
+	float ny = sin(noise(vec2(100.0 + screenUV.y * 72.2, 1500.0 + screenUV.x)));
+	vec4 reflectionColour = texture2D(reflectMap, vec2(nx, ny) + screenUV * vec2(0.5, 1.0));
+	vec4 refractionColour = texture2D(reflectMap, vec2(nx, ny) + screenUV * vec2(0.5, 1.0) + vec2(0.5, 0.0));
 	vec4 result = mix(mix(reflectionColour, refractionColour, 0.5), vec4(0.0, 1.0, 1.0, 1.0), depth);
 	float mul = dot(vec3(0.0, 1.0, 0.0), vnormal);
 	result = result * mul;