Shader "Unlit/transparent"
{
    Properties
    {
        _Color("Color",Color)=(1,1,1,1)
        _MainTex ("Texture", 2D) = "white" {}
        _Cutoff("CutOff",Range(0,1))=0.5
    }
    SubShader
    {
        Tags{ "Queue" = "AlphaTest" "IgnoreProjector"="True" "RenderType" = "TransparentCutout" }

        Pass
        {
            Tags{"LightMode"="ForwardBase"}
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            
            #include "UnityCG.cginc"
            #include "Lighting.cginc"

            struct appdata
            {
                float4 vertex : POSITION;
                float2 uv : TEXCOORD0;
                float3 normal:NORMAL;
            };

            struct v2f
            {
                float2 uv : TEXCOORD0;
                float4 vertex : SV_POSITION;
                float3 worldNormal:TEXCOORD1;
                float3 worldPos:TEXCOORD2;
            };

            sampler2D _MainTex;
            float4 _MainTex_ST;
            float3 _Color;
            float _Cutoff;
            
            v2f vert (appdata v)
            {
                v2f o;
                o.vertex = UnityObjectToClipPos(v.vertex);
                o.uv = TRANSFORM_TEX(v.uv, _MainTex);
                o.worldNormal = UnityObjectToWorldNormal(v.normal);
                o.worldPos = mul(unity_ObjectToWorld, o.vertex);
                return o;
            }
            
            fixed4 frag (v2f i) : SV_Target
            {
                fixed4 col = tex2D(_MainTex, i.uv);
                clip(col.a - _Cutoff);//透明度测试
                /*if ((col.a - _Cutoff) < 0.0) {
                     discard;//不通过直接舍弃
                }*/

                fixed3 wn = normalize(i.worldNormal);
                fixed3 wl = normalize(UnityWorldSpaceLightDir(i.worldPos));

                fixed3 diffuse = (dot(wn, wl) * 0.5 + 0.5) * _LightColor0 * _Color * col;

                return fixed4(diffuse,1);
            }
            ENDCG
        }
    }
}