Shader "YXJ/Unlit/Wave" 
{
	Properties
	{
		_MainTex("Base (RGB)", 2D) = "white" {}
		_Color("Tint", Color) = (1,1,1,1)
		_ColorStrength("ColorStrength",Float) = 0
		_WaveStrength("Wave Strength",Float) = 0.01
		_WaveFactor("Wave Factor",Float) = 50
		_TimeScale("Time Scale",Float) = 10
		_Fade("Fade",Float) = 1

	}
		
	SubShader
	{
		Tags { "Queue"="Transparent" "IgnoreProjector"="True" "RenderType"="Transparent" }
		Blend SrcAlpha OneMinusSrcAlpha
		ColorMask RGB
		Cull [_Cull] Lighting Off ZWrite Off
		Pass
		{
			ZTest Greater
			CGPROGRAM

			#pragma vertex vert 
			#pragma fragment frag

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

			};

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

			sampler2D _MainTex;
			fixed4 _Color;
			float _WaveStrength;
			float _WaveFactor;
			float _TimeScale;
			float _Fade;
			float _ColorStrength;

			v2f vert(appdata v)
			{
				v2f o;
				o.uv = v.uv;
				o.vertex = UnityObjectToClipPos(v.vertex);

				return o;
			}

			fixed4 frag(v2f IN) :COLOR
			{
				fixed2 uvDir = normalize(IN.uv - fixed2(0.5, 0.5));
				fixed dis = distance(IN.uv, fixed2(0.5, 0.5));

				fixed2 uv = IN.uv + _WaveStrength * uvDir * sin(_Time.y * _TimeScale + dis * _WaveFactor);
				fixed4 col = tex2D(_MainTex, uv) * _Color * sin(1 - abs(2 * IN.uv.x - 1) + _Fade) * sin (1 - abs(2 * IN.uv.y - 1) + _Fade) * _ColorStrength;
				col.a *= 0.5;
				return col;
			}

			ENDCG
		}

		Pass
		{
			ZTest Less
			CGPROGRAM

			#pragma vertex vert 
			#pragma fragment frag

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

			};

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

			sampler2D _MainTex;
			fixed4 _Color;
			float _WaveStrength;
			float _WaveFactor;
			float _TimeScale;
			float _Fade;
			float _ColorStrength;

			v2f vert(appdata v)
			{
				v2f o;
				o.uv = v.uv;
				o.vertex = UnityObjectToClipPos(v.vertex);

				return o;
			}

			fixed4 frag(v2f IN) :COLOR
			{
				fixed2 uvDir = normalize(IN.uv - fixed2(0.5, 0.5));
				fixed dis = distance(IN.uv, fixed2(0.5, 0.5));

				fixed2 uv = IN.uv + _WaveStrength * uvDir * sin(_Time.y * _TimeScale + dis * _WaveFactor);
				return tex2D(_MainTex, uv) * _Color * sin(1 - abs(2 * IN.uv.x - 1) + _Fade) * sin (1 - abs(2 * IN.uv.y - 1) + _Fade) * _ColorStrength;
			}

			ENDCG
		}
	}

	FallBack "Diffuse"
}