Shader "Custom/Specular Blinn-Phong"

 {

     Properties

     {

         _Diffuse ("Diffuse Color", Color) = (,,,)

         _Specular ("Specular Color", Color) = (,,,)

         _Gloss ("Gloss", Range(, )) =

     }

     SubShader

     {

         Tags { "RenderType"="Opaque" }

         LOD 

         Pass

         {

             Tags { "LightMode"="ForwardBase" }

             CGPROGRAM

             #pragma vertex vert

             #pragma fragment frag

             #include "UnityCG.cginc"

             #include "Lighting.cginc"

             struct appdata

             {

                 float4 vertex : POSITION;

                 float3 normal : NORMAL;

             };

             struct v2f

             {

                 float4 vertex : SV_POSITION;

                 float3 worldPos : TEXCOORD0;

                 float3 worldNormal : TEXCOORD1;

             };

             fixed4 _Diffuse;

             fixed4 _Specular;

             float _Gloss;

             v2f vert (appdata v)

             {

                 v2f o;

                 o.vertex = UnityObjectToClipPos(v.vertex);

                 o.worldNormal = UnityObjectToWorldNormal(v.normal);

                 o.worldPos = mul(unity_ObjectToWorld, v.vertex);

                 return o;

             }

             fixed4 frag (v2f i) : SV_Target

             {

                 // specular

                 float3 worldNormal = normalize(i.worldNormal);

                 float3 lightDir = UnityWorldSpaceLightDir(i.worldPos);

                 lightDir = normalize(lightDir);

                 float3 viewDir = UnityWorldSpaceViewDir(i.worldPos);

                 viewDir = normalize(viewDir);

                 float3 halfDir = normalize(lightDir + viewDir);

                 float d = max(, dot(halfDir, worldNormal));

                 float3 spec = _LightColor0.rgb * _Specular.rgb * pow(d, _Gloss);

                 // diffuse

                 float3 diff = _LightColor0.rgb * _Diffuse.rgb * max(, dot(lightDir, worldNormal));

                 float3 c = spec + diff + UNITY_LIGHTMODEL_AMBIENT.rgb;

                 return fixed4(c, );

             }

             ENDCG

         }

     }

 }