Shader "harry_t/shadowplane_mulw"
{
	Properties
	{
		_MainTex ("Texture", 2D) = "white" {}
      _Floor ("Floor Height (Worldspace)", Float) = 0.0
	}
	SubShader
	{
		Tags { "Queue" = "Transparent+6" "DisableBatching"="true" }

		ZWrite Off
		Cull Off

		Pass
		{
			Blend SrcAlpha OneMinusSrcAlpha

			CGPROGRAM
			#pragma vertex vert
			#pragma fragment frag

			#include "UnityCG.cginc"

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

			struct v2f
			{
				float3 uv : TEXCOORD0;
				float4 vertex : SV_POSITION;
			};

			sampler2D _MainTex;
         float _Floor;

			v2f vert (appdata v)
			{
				v2f o;

				float3 base = mul( unity_ObjectToWorld, float4(0.0,0.0,0.0,1.0) );
				
				float scale = 1.0 - (clamp(abs(base.y-_Floor), 0.0, 0.06) * 16.666666666);
				
				//if( base.y > 0.0 )
				base.y = _Floor;

				float4 pos_world = float4( v.vertex.xyz + base, 1.0 );
				o.vertex = mul( UNITY_MATRIX_VP, pos_world );
				o.uv = float3( v.uv, scale );

				return o;
			}

			fixed4 frag (v2f i) : SV_Target
			{
				return tex2D(_MainTex, i.uv.xy) * float4( 1.0, 1.0, 1.0, i.uv.z );
			}
			ENDCG
		}
	}
}