using UnityEngine;
using System.Collections;

public class Enemy : MonoBehaviour {

    // Use this for initialization
    void Start () {

    }
    
    // Update is called once per frame
    void Update () {
    
    }
}

using UnityEngine;
using System.Collections;

public class Frog : Enemy {

    // Use this for initialization
    void Start () {
    }
    
    // Update is called once per frame
    void Update () {
    
    }
}

Shader "Sprites/Default"
{
    Properties
    {
  [PerRendererData] _MainTex ("Sprite Texture", 2D) = "white" {}
  _Color ("Tint", Color) = (1,1,1,1)
  [MaterialToggle] PixelSnap ("Pixel snap", Float) = 0
    }

    SubShader
    {
  Tags
  {
   "Queue"="Transparent"
   "IgnoreProjector"="True"
   "RenderType"="Transparent"
   "PreviewType"="Plane"
   "CanUseSpriteAtlas"="True"
  }

  Cull Off
  Lighting Off
  ZWrite Off
  Blend One OneMinusSrcAlpha

  Pass
  {
  CGPROGRAM
   #pragma vertex vert
   #pragma fragment frag
   #pragma multi_compile _ PIXELSNAP_ON
   #pragma shader_feature ETC1_EXTERNAL_ALPHA
   #include "UnityCG.cginc"
   
   struct appdata_t
   {
    float4 vertex   : POSITION;
    float4 color    : COLOR;
    float2 texcoord : TEXCOORD0;
   };

   struct v2f
   {
    float4 vertex   : SV_POSITION;
    fixed4 color    : COLOR;
    float2 texcoord  : TEXCOORD0;
   };
   
   fixed4 _Color;

   v2f vert(appdata_t IN)
   {
    v2f OUT;
    OUT.vertex = mul(UNITY_MATRIX_MVP, IN.vertex);
    OUT.texcoord = IN.texcoord;
    OUT.color = IN.color * _Color;
    #ifdef PIXELSNAP_ON
    OUT.vertex = UnityPixelSnap (OUT.vertex);
    #endif

    return OUT;
   }

   sampler2D _MainTex;
   sampler2D _AlphaTex;

   fixed4 SampleSpriteTexture (float2 uv)
   {
    fixed4 color = tex2D (_MainTex, uv);

#if ETC1_EXTERNAL_ALPHA
    // get the color from an external texture (usecase: Alpha support for ETC1 on android)
    color.a = tex2D (_AlphaTex, uv).r;
#endif //ETC1_EXTERNAL_ALPHA

    return color;
   }

   fixed4 frag(v2f IN) : SV_Target
   {
    fixed4 c = SampleSpriteTexture (IN.texcoord) * IN.color;
    c.rgb *= c.a;
    return c;
   }
  ENDCG
  }
    }
}