// Upgrade NOTE: replaced 'mul(UNITY_MATRIX_MVP,*)' with 'UnityObjectToClipPos(*)'

Shader "Custom/SpriteWithMask" {
    Properties
    {
        _MainTex ("Base", 2D) = "white" {}
        _MaskTex ("Mask", 2D) = "white" {}
        _Color ("Color", Color) = (0.5, 0.5, 0.5, 0.5)
    }

    SubShader
    {
        Pass
        {
         //   Blend SrcAlpha OneMinusSrcAlpha
// inside SubShader
//Tags { "Queue"="Transparent" "RenderType"="Transparent" "IgnoreProjector"="True" }

// inside Pass
//ZWrite Off
Blend SrcAlpha OneMinusSrcAlpha

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

            uniform int ArrayLength = 0;
            uniform float Array[1023];

            sampler2D _MainTex;
            sampler2D _MaskTex;
            float4 _Color;

            struct v2f
            {
                float4 pos : SV_POSITION;
                float2 uv1 : TEXCOORD0;
                float2 uv2 : TEXCOORD1;
            };

            float4 _MainTex_ST;
            float4 _MaskTex_ST;

            v2f vert (appdata_base v)
            {
                v2f o;
                o.pos = UnityObjectToClipPos (v.vertex);
                o.uv1 = TRANSFORM_TEX (v.texcoord, _MainTex);
                o.uv2 = TRANSFORM_TEX (v.texcoord, _MaskTex);
                return o;
            }

            fixed4 frag (v2f i) : COLOR
            {

                fixed4 base = tex2D (_MainTex, i.uv1);
                fixed4 mask = tex2D (_MaskTex, i.uv2);

                if(ArrayLength==0)
                {
                    return base * _Color;
                }

                for (int i=0; i < ArrayLength ; i++)
                {
                    if(Array[i] < 256)
                    {
                        if(Array[i] == mask.r)
                        {
                            return base;
                        }
                    }
                    else if(Array[i] < 511)
                    {
                        if(Array[i] - 256 == mask.g)
                        {
                            return base;
                        }
                    }
                    else
                    {
                        if(Array[i] - 512 == mask.b)
                        {
                            return base;
                        }
                    }

                }

                return fixed4(1,1,1,0);



               // base.w = mask.x * mask.x * mask.x;
               // return base * (_Color * 2.0f);
             //  return mask;
             //  return half4(0,0,1,1);
            }
            ENDCG
        }
    }
    FallBack Off
}