shaders: Use sin-less hash for noise (#5607)

src/render/shaders/Textures.hpp

@@ -400,7 +400,9 @@ uniform float     noise;
 uniform float     brightness;
 
 float hash(vec2 p) {
-    return fract(sin(dot(p, vec2(12.9898, 78.233))) * 43758.5453);
+    vec3 p3 = fract(vec3(p.xyx) * 1689.1984);
+    p3 += dot(p3, p3.yzx + 33.33);
+    return fract((p3.x + p3.y) * p3.z);
 }
 
 void main() {