文字をランダムに表示するシェーダー

charsshader.shader

Shader "Unlit/charshader"
{
	Properties
	{
		_MainTex ("Texture", 2D) = "white" {}
		
	}
	SubShader
	{
		Tags { "RenderType"="Opaque" }
		LOD 100

		Pass
		{
			CGPROGRAM
			#pragma vertex vert
			#pragma fragment frag
			// make fog work
			#pragma multi_compile_fog
			
			#include "UnityCG.cginc"

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

			struct v2f
			{
				float2 uv : TEXCOORD0;
				UNITY_FOG_COORDS(1)
				float4 vertex : SV_POSITION;
			};

			sampler2D _MainTex;
			float4 _MainTex_ST;
			
			v2f vert (appdata v)
			{
				v2f o;
				o.vertex = UnityObjectToClipPos(v.vertex);
				o.uv = TRANSFORM_TEX(v.uv, _MainTex);
				UNITY_TRANSFER_FOG(o,o.vertex);
				return o;
			}
			float random (fixed2 p) 
			{ 
				return frac(sin(floor(_Time.z)*dot(p, fixed2(12.9898,78.233))) * 43758.5453);
			}

			float noise(fixed2 st)
			{
				fixed2 p = floor(st);
				return random(p);
			}

			fixed4 frag (v2f i) : SV_Target
			{
				int s = 10;	//１列の表示文字数
				int w = 3;//文字ソースの１列の文字数
            	float c = noise( i.uv*s + 1);
				//return fixed4(c,c,c,1);

				float x = frac(floor(c*w*w)/w);
				float y = floor(c*w)/w;
				float dx = frac(i.uv.x*s)/w;
				float dy = frac(i.uv.y*s)/w;
				fixed4 col = tex2D(_MainTex,float2(x+dx,y+dy));
				return col;

			}

			ENDCG
		}
	}
}