Shader "ShaderDrill/ScrollByTime"
{
	Properties
	{
		_MainTex("Texture", 2D) = "white" {}
		_SpeedU("Speed U", Float) = 1.0
		_SpeedV("Speed V", Float) = 1.0
	}
	SubShader
	{
		Tags{ "Queue" = "Transparent" "IgnoreProjector" = "True" "RenderType" = "Transparent" }

		Blend SrcAlpha OneMinusSrcAlpha

		ZWrite Off
		ZTest LEqual

		Pass
		{
			CGPROGRAM

			#pragma vertex vert
			#pragma fragment frag

			#include "UnityCG.cginc"

			struct appdata_t
			{
				float4 vertex : POSITION;
				float2 texcoord : TEXCOORD0;
			};

			struct v2f
			{
				float4 vertex : SV_POSITION;
				float2 texcoord : TEXCOORD0;
			};

			sampler2D _MainTex;
			float4 _MainTex_ST;
			float _SpeedU;
			float _SpeedV;

			v2f vert(appdata_t v)
			{
				v2f o;
				o.vertex = mul(UNITY_MATRIX_MVP, v.vertex);
				o.texcoord = TRANSFORM_TEX(v.texcoord, _MainTex);
				return o;
			}

			fixed4 frag(v2f i) : SV_Target
			{
				float2 offset;
				offset.x = _SpeedU * _Time.y;
				offset.y = _SpeedV * _Time.y;
				fixed4 dst = tex2D(_MainTex, i.texcoord + offset);
				return dst;
			}

			ENDCG
		}
	}
}