Unity ,Shader,white noise

White Noise Unity

Shader "Noise/WhiteNoise"
{
	Properties
	{
		_MainTex ("Texture", 2D) = "white" {}
		_Color("Color",Color) = (1,1,1,1)
	}
	SubShader
	{
		// No culling or depth
		Cull Off ZWrite Off ZTest Always

		Pass
		{
			CGPROGRAM
			#pragma vertex vert
			#pragma fragment frag
			
			#include "UnityCG.cginc"

			struct appdata
			{
				float4 vertex : POSITION;
				float2 uv : TEXCOORD0;
			};

			struct v2f
			{
				float2 uv : TEXCOORD0;
				float4 vertex : SV_POSITION;
			};

			v2f vert (appdata v)
			{
				v2f o;
				o.vertex = UnityObjectToClipPos(v.vertex);
				o.uv = v.uv;
				return o;
			}
			
			sampler2D _MainTex;
			float4 _Color;

			float hash( uint2 hashInput )
			{
				uint2 q = 1103515245U * ( (hashInput.x>>1U) ^ (hashInput.yx   ) )*abs(sin(_Time.y));
				uint  n = 1103515245U * ( (q.x  ) ^ (q.y>>3U) );
				return float(n) * (1.0/float(0xffffffffU));
			}



			fixed4 frag (v2f i) : SV_Target
			{
				fixed4 col = tex2D(_MainTex, i.uv);

				uint2 p = (i.uv*_ScreenParams);
    
				float f = hash(p);
				
				col = float4( f, f, f, 1.0 );

				return col;
			}
			ENDCG
		}
	}
}