Shader "Unlit/XuanKuang"
{
    Properties
    {
        [HDR]_MainCol("MainCol",color) = (1,1,1,1)
        [HDR]_FlowCol("FlowCol",color)= (1,1,1,1)
        _FlowTex("FlowTex",2D)= "white" {}
        _FlowSpeed("FlowSpeed",Vector)= (0, 0,0, 0)        
    }
    SubShader
    {
        Cull Off
        ZTest Off
        ZWrite Off
        Blend SrcAlpha OneMinusSrcAlpha

        Tags {"Queue"= "Transparent" "RenderType"="Transparent" }
        

        Pass
        {
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag
           

            #include "UnityCG.cginc"

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

            struct v2f
            {
                float4 color: TEXCOORD0;             
                float4 vertex : SV_POSITION;
                float2 uv:TEXCOORD1;
            };


            half4 _MainCol, _FlowCol;
            sampler2D _FlowTex;
            float4 _FlowTex_ST;
            float4 _FlowSpeed;

            v2f vert (appdata v)
            {
                v2f o;
                o.vertex = UnityObjectToClipPos(v.vertex);
                o.color = v.color;
                o.uv = TRANSFORM_TEX(v.uv, _FlowTex);
                o.uv += _Time.y * float2(_FlowSpeed.x, _FlowSpeed.y);
                return o;
            }

            half4 frag(v2f i) : SV_Target
            {
                // sample the texture
                half4 col = half4(_MainCol.rgb,_MainCol.a*i.color.a);
                half4 flowCol = tex2D(_FlowTex, i.uv) * _FlowCol* i.color.r;
                half4 finalCol = half4(col.rgb + flowCol.rgb, min(1, (col.a + i.color.r))* i.color.a);
                return finalCol;
            }
            ENDCG
        }
    }
}