improvement

fragment.glsl

@@ -71,6 +71,12 @@ float perlin_noise(vec2 uv, vec2 vector_offset, float angle_offset) {
     return val /2.0 + 0.5;
 }
 
+float limit(float val, float min, float max) {
+    float out_val = clamp(val, min, max);
+    out_val -= min;
+    out_val *= (1.0 - (max - min)) / (max - min);
+    return out_val;
+}
 
 void main() {
     vec2 uv = gl_FragCoord.xy / WindowSize;
@@ -82,11 +88,11 @@ void main() {
     uv += 100.0;
     //uv.x += time / 20.0;
     float out_val = perlin_noise(uv, vec2(0.0, 0.0), time / 1.0);
-    float min = 0.42;
-    float max = 0.58;
-    out_val = out_val + sin(uv.y + time) / 15.2;
-    out_val = clamp(out_val, min, max);
-    out_val -= min;
-    out_val *= (1.0 - (max - min)) / (max - min);
+    float min = 0.42 + sin(time)/8.0;
+    float max = 0.58 + sin(time)/8.0;
+    //float min = 0.42;
+    //float max = 0.58;
+    //out_val = out_val + sin(uv.y + time) / 15.2;
+    out_val = limit(out_val, min, max);
     color = vec4(out_val, 0.4, 0.8, 1.0);
 }