optimize now and noise filters

Author: pedroSG94

encoder/src/main/res/raw/noise_fragment.glsl

@@ -1,14 +1,18 @@
-precision highp float;
+precision mediump float;
 
 uniform sampler2D uSampler;
 uniform float uTime;
 uniform float uStrength;
 
 varying vec2 vTextureCoord;
 
+float hash(highp vec2 p) {
+  p = fract(p * 0.3183099) * 50.0;
+  return fract(p.x * p.y * (p.x + p.y));
+}
+
 void main() {
-  vec4 color = texture2D(uSampler, vTextureCoord);
-  float x = (vTextureCoord.x + 4.0) * (vTextureCoord.y + 4.0) * (uTime * 10.0);
-  vec4 grain = vec4(mod((mod(x, 13.0) + 1.0) * (mod(x, 123.0) + 1.0), 0.01) - 0.005) * uStrength;
-  gl_FragColor = color + grain;
+  vec2 seed = vTextureCoord * 100.0 + uTime;
+  float r = hash(seed) * 0.01 - 0.005;
+  gl_FragColor = texture2D(uSampler, vTextureCoord) + vec4(r) * uStrength;
 }

encoder/src/main/res/raw/simple_fragment.glsl

@@ -1,4 +1,4 @@
-precision highp float;
+precision mediump float;
 
 uniform sampler2D uSampler;
 varying vec2 vTextureCoord;

encoder/src/main/res/raw/snow_fragment.glsl

@@ -1,4 +1,4 @@
-precision highp float;
+precision mediump float;
 
 uniform sampler2D uSampler;
 uniform float uTime;
@@ -18,10 +18,10 @@ void main() {
 	for (float i = 0.0; i < uLayers; i++) {
 		vec2 q = vTextureCoord * (1.0 + i * uDepth);
 		q += vec2(q.y * (uWidth * mod(i * 7.238917, 1.0) - uWidth * 0.5), uSpeed * uTime / (1.0 + i * uDepth * 0.03));
-		vec3 n = vec3(floor(q), 31.189 + i);
-		vec3 m = floor(n) * 0.00001 + fract(n);
-		vec3 mp = (31415.9 + m ) / fract(p * m);
-		vec3 r = fract(mp);
+		highp vec3 n = vec3(floor(q), 31.189 + i);
+		highp vec3 m = floor(n) * 0.00001 + fract(n);
+		highp vec3 mp = (31415.9 + m ) / fract(p * m);
+		highp vec3 r = fract(mp);
 		vec2 s = abs(mod(q, 1.0) - 0.5 + 0.9 * r.xy - 0.45);
 		s += 0.01 * abs(2.0 * fract(10.0 * q.yx) - 1.0);
 		float d = .6 * max(s.x - s.y, s.x + s.y) + max(s.x, s.y) - 0.01;