mosaic.shader

Shader "Unlit/mosaic"
{
    Properties
    {
        _DivideNum ( "Divide Num", Float ) = 1
    }
    SubShader
    {
        Tags { "RenderType"="Opaque" }
        LOD 100
        Cull Off ZWrite Off ZTest Always
        GrabPass
        {
            "_BackgroundTexture"
        }
        Pass
        {
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            #include "UnityCG.cginc"

            sampler2D _BackgroundTexture;
            float _DivideNum;
            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;
            }

            fixed4 frag (v2f i) : SV_Target
            {

                return tex2D( _BackgroundTexture, floor(i.uv * _DivideNum ) / _DivideNum );
            }
            ENDCG
        }
    }
}