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

Shader "Enviro/Standard/ShadowCookie"
{
	Properties
	{
		_MainTex ("Texture", 2D) = "white" {}
	}
	SubShader
	{
		// No culling or depth
		Cull Off ZWrite Off ZTest Always

		Pass
		{
			CGPROGRAM
			#pragma vertex vert
			#pragma fragment frag
			#pragma target 2.0
			#include "UnityCG.cginc"
			#pragma exclude_renderers gles 
			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;
			}
			
			uniform sampler2D _MainTex;
			uniform float _shadowIntensity;
			uniform int _shadowMode;
			uniform float _Rotation;

			float2 rotateUV(float2 uv, float rotation)
			{
				float s = sin ( rotation );
				float c = cos ( rotation );
				float2x2 rotationMatrix = float2x2( c, -s, s, c);
				return mul ( uv - 0.5, rotationMatrix ) + 0.5;
			}

			fixed4 frag (v2f i) : SV_Target
			{
				fixed4 col = 1 - (tex2D(_MainTex, rotateUV(i.uv,_Rotation)) * _shadowIntensity);
				return float4(col.r,col.r,col.r,col.r);
			}
			ENDCG
		}
	}
}