Shader "Custom/NewSurfaceShader"
{
    Properties
    {
        _Color ("Color", Color) = (1,1,1,1)
        _MainTex ("Albedo (RGB)", 2D) = "white" {}
        _Glossiness ("Smoothness", Range(0,1)) = 0.5
        _Metallic ("Metallic", Range(0,1)) = 0.0
    }
    SubShader
    {
        Tags { "RenderType"="Opaque" }
        LOD 200

        CGPROGRAM
        // Physically based Standard lighting model, and enable shadows on all light types
        #pragma surface surf Standard fullforwardshadows

        // Use shader model 3.0 target, to get nicer looking lighting
        #pragma target 3.0

        sampler2D _MainTex;

        struct Input
        {
            float2 uv_MainTex;
        };

        half _Glossiness;
        half _Metallic;
        fixed4 _Color;

        // Add instancing support for this shader. You need to check 'Enable Instancing' on materials that use the shader.
        // See https://docs.unity3d.com/Manual/GPUInstancing.html for more information about instancing.
        // #pragma instancing_options assumeuniformscaling
        UNITY_INSTANCING_BUFFER_START(Props)
            // put more per-instance properties here
        UNITY_INSTANCING_BUFFER_END(Props)

        void surf (Input IN, inout SurfaceOutputStandard o)
        {
            // Albedo comes from a texture tinted by color
            fixed4 c = tex2D (_MainTex, IN.uv_MainTex) * _Color;
            o.Albedo = c.rgb;
            // Metallic and smoothness come from slider variables
            o.Metallic = _Metallic;
            o.Smoothness = _Glossiness;
            o.Alpha = c.a;
        }
        ENDCG

            Pass{
            Cull Front
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            #include "UnityCG.cginc"
            #include "AutoLight.cginc"


            struct appdata
            {
                float4 vertex : POSITION;
                float2 texcoord0 : TEXCOORD0;
                float3 normal : NORMAL;
                float4 color : COLOR;
            };

            struct v2f
            {
                float4 pos : SV_POSITION;
                float2 uv : TEXCOORD0;
                float4 vertex_color : TEXCOORD3;
            };

            float _OutlineWidth;
            float _OutlineZbias;
            float4 _OutlineColor;

            v2f vert(appdata v)
            {
                v2f o;
                float3 pos_view = UnityObjectToViewPos(v.vertex);
                float3 normal_world = UnityObjectToWorldNormal(v.normal);
                float3 outline_dir = normalize(mul((float3x3)UNITY_MATRIX_V, normal_world));
                outline_dir.z = _OutlineZbias * (1.0 - v.color.b);
                pos_view += outline_dir * _OutlineWidth * 0.001 * v.color.a;
                o.pos = mul(UNITY_MATRIX_P, float4(pos_view, 1.0));
                o.uv = v.texcoord0;
                o.vertex_color = v.color;
                return o;
            }

            half4 frag(v2f i) : SV_Target
            {
                half3 outlineColor = _OutlineColor.xyz;
                return float4(outlineColor, 1.0);
            }
            ENDCG
        }
    }
    FallBack "Diffuse"
}