Shader "Custom/Bumped Specular"

{

    Properties

    {

        _MainTex("Main Texture", 2D) = "white" {}

        _NormalMap("Normal Map", 2D) = "bump" {}

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

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

    }

    SubShader

    {

        Tags

        {

            "Queue" = "Geometry"

            "RenderType" = "Opaque"

        }

        Pass

        {

            Tags

            {

                "LightMode" = "ForwardBase"

            }

            CGPROGRAM

            #pragma vertex vert

            #pragma fragment frag

            #pragma multi_compile_fwdbase

            #include "UnityCG.cginc"

            #include "Lighting.cginc"

            #include "AutoLight.cginc"

            sampler2D _MainTex;

            float4 _MainTex_ST;

            sampler2D _NormalMap;

            float4 _NormalMap_ST;

            fixed4 _Specular;

            float _Gloss;

            struct appdata

            {

                float4 vertex : POSITION;

                float4 uv : TEXCOORD0;

                fixed4 color : COLOR;

                float4 tangent : TANGENT;

                float3 normal : NORMAL;

            };

            struct v2f

            {

                float4 pos : SV_POSITION;

                float4 uv : TEXCOORD0;

                fixed4 color : COLOR;

                float4 T2W1 : TEXCOORD1;

                float4 T2W2 : TEXCOORD2;

                float4 T2W3 : TEXCOORD3;

                SHADOW_COORDS()

            };

            v2f vert(appdata v)

            {

                v2f o;

                o.pos = mul(UNITY_MATRIX_MVP, v.vertex);

                float2 uv1 = v.uv.xy * _MainTex_ST.xy + _MainTex_ST.zw;

                float2 uv2 = v.uv.zw * _NormalMap_ST.xy + _NormalMap_ST.zw;

                o.uv = float4(uv1, uv2);

                o.color = v.color;

                float3 worldTangent = UnityObjectToWorldDir(v.tangent.xyz);

                float3 worldNormal = UnityObjectToWorldNormal(v.normal);

                float3 binormal = cross(normalize(worldNormal), normalize(worldTangent)) * v.tangent.w;

                float3 worldPos = mul(unity_ObjectToWorld, v.vertex).xyz;

                o.T2W1 = float4(worldTangent.x, binormal.x, worldNormal.x, worldPos.x);

                o.T2W2 = float4(worldTangent.y, binormal.y, worldNormal.y, worldPos.y);

                o.T2W3 = float4(worldTangent.z, binormal.z, worldNormal.z, worldPos.z);

                TRANSFER_SHADOW(o);

                return o;

            }

            fixed4 frag(v2f i) : SV_TARGET

            {

                float3 worldPos = float3(i.T2W1.w, i.T2W2.w, i.T2W3.w);

                float3 worldLight = normalize(UnityWorldSpaceLightDir(worldPos));

                float3 worldView = normalize(UnityWorldSpaceViewDir(worldPos));

                fixed4 albedo = tex2D(_MainTex, i.uv.xy) * i.color;

                float3 tangentNormal = UnpackNormal(tex2D(_NormalMap, i.uv.zw));

                float3x3 tanToWorld = float3x3(i.T2W1.xyz, i.T2W2.xyz, i.T2W3.xyz);

                float3 worldNormal = mul(tanToWorld, tangentNormal);

                fixed3 ambient = albedo.xyz * UNITY_LIGHTMODEL_AMBIENT.xyz;

                fixed3 diffuse = albedo.xyz * _LightColor0.xyz * max(, dot(worldLight, worldNormal));

                float3 halfDir = normalize(worldLight + worldView);

                fixed3 specular = albedo.xyz * _Specular * pow(max(, dot(worldNormal, halfDir)), _Gloss);

                UNITY_LIGHT_ATTENUATION(atten, i, worldPos);

                fixed3 col = ambient + (diffuse + specular) * atten;

                return fixed4(col, );

            }

            ENDCG

        }

        Pass

        {

            Tags

            {

                "LightMode" = "ForwardAdd"

            }

            Blend One One

            CGPROGRAM

            #pragma vertex vert

            #pragma fragment frag

            #pragma multi_compile_fwdadd_fullshadows

            #include "UnityCG.cginc"

            #include "Lighting.cginc"

            #include "AutoLight.cginc"

            sampler2D _MainTex;

            float4 _MainTex_ST;

            sampler2D _NormalMap;

            float4 _NormalMap_ST;

            fixed4 _Specular;

            float _Gloss;

            struct appdata

            {

                float4 vertex : POSITION;

                float4 uv : TEXCOORD0;

                fixed4 color : COLOR;

                float4 tangent : TANGENT;

                float3 normal : NORMAL;

            };

            struct v2f

            {

                float4 pos : SV_POSITION;

                float4 uv : TEXCOORD0;

                fixed4 color : COLOR;

                float4 T2W1 : TEXCOORD1;

                float4 T2W2 : TEXCOORD2;

                float4 T2W3 : TEXCOORD3;

                SHADOW_COORDS()

            };

            v2f vert(appdata v)

            {

                v2f o;

                o.pos = mul(UNITY_MATRIX_MVP, v.vertex);

                float2 uv1 = v.uv.xy * _MainTex_ST.xy + _MainTex_ST.zw;

                float2 uv2 = v.uv.zw * _NormalMap_ST.xy + _NormalMap_ST.zw;

                o.uv = float4(uv1, uv2);

                o.color = v.color;

                float3 worldTangent = UnityObjectToWorldDir(v.tangent.xyz);

                float3 worldNormal = UnityObjectToWorldNormal(v.normal);

                float3 binormal = cross(normalize(worldNormal), normalize(worldTangent)) * v.tangent.w;

                float3 worldPos = mul(unity_ObjectToWorld, v.vertex).xyz;

                o.T2W1 = float4(worldTangent.x, binormal.x, worldNormal.x, worldPos.x);

                o.T2W2 = float4(worldTangent.y, binormal.y, worldNormal.y, worldPos.y);

                o.T2W3 = float4(worldTangent.z, binormal.z, worldNormal.z, worldPos.z);

                TRANSFER_SHADOW(o);

                return o;

            }

            fixed4 frag(v2f i) : SV_TARGET

            {

                float3 worldPos = float3(i.T2W1.w, i.T2W2.w, i.T2W3.w);

                float3 worldLight = normalize(UnityWorldSpaceLightDir(worldPos));

                float3 worldView = normalize(UnityWorldSpaceViewDir(worldPos));

                fixed4 albedo = tex2D(_MainTex, i.uv.xy) * i.color;

                float3 tangentNormal = UnpackNormal(tex2D(_NormalMap, i.uv.zw));

                float3x3 tanToWorld = float3x3(i.T2W1.xyz, i.T2W2.xyz, i.T2W3.xyz);

                float3 worldNormal = mul(tanToWorld, tangentNormal);

                fixed3 diffuse = albedo.xyz * _LightColor0.xyz * max(, dot(worldLight, worldNormal));

                float3 halfDir = normalize(worldLight + worldView);

                fixed3 specular = albedo.xyz * _Specular * pow(max(, dot(worldNormal, halfDir)), _Gloss);

                UNITY_LIGHT_ATTENUATION(atten, i, worldPos);

                fixed3 col = (diffuse + specular) * atten;

                return fixed4(col, );

            }

            ENDCG

        }

    }

    Fallback "Specular"

}