URP Shader BlinnPhong with Normal mapping

 

URP Shader Training 중급에서 사용할 example.

maskmap이랑 몇가지는 그냥 임의 커스텀(참고용). 이거저거 잡다하게 붙인...

 

Shader "LightingExample/BlinnPhong"   {      Properties   {          [Header(URP BlinnPhong Lighting)]      [Space(20)]      _TintColor ("Tint Color", color) = (1,1,1,1)      _BaseMap("Albedo(RGB)", 2D) = "white" {}      [Normal]_BumpMap("Normal texture", 2D) = "white" {}      _MaskMap("Occlusion(G), Glossness(A)", 2D) = "white" {}           [Space(20)][Header(Control slide bar)]      _SpecColor("Specular Color", color) = (1,1,1,1)      _Specular("Specular Intensity", Range(0, 10)) = 1      _Glossness("Glossness", Range(0.1, 50)) = 1          _OcclusionInten("Occlusion Intensity", Range(0,1)) = 1      _EnviIntensity("Environment Lighting", Range(0,1)) = 1     }    SubShader         {          Tags         {         "RenderPipeline"="UniversalPipeline"         "RenderType"="Opaque"                   "Queue"="Geometry"          }      Pass      {         Name "Universal Forward"             Tags {"LightMode" = "UniversalForward"}           HLSLPROGRAM          #pragma prefer_hlslcc gles          #pragma exclude_renderers d3d11_9x          #pragma vertex vert          #pragma fragment frag        #include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Lighting.hlsl"         struct VertexInput           {             float4 vertex : POSITION;             float3 normal : NORMAL;             float2 uv       : TEXCOORD0;             float4 tangent : TANGENT;           };         struct VertexOutput           {             float4 vertex      : SV_POSITION;             float3 normalWS    : NORMAL;                         float2 uv               : TEXCOORD0;             float3 tangentWS    : TEXCOORD1;             float3 bitangentWS  : TEXCOORD2;             float3 viewDir         : TEXCOORD3;             };            float4 _BaseMap_ST;            Texture2D _BaseMap, _BumpMap, _MaskMap;            SamplerState sampler_BaseMap;                float _Specular, _Glossness, _OcclusionInten, _EnviIntensity;            half4 _TintColor, _SpecColor;    VertexOutput vert(VertexInput v)          {           VertexOutput o;           o.vertex    = TransformObjectToHClip(v.vertex.xyz);                      o.normalWS  = TransformObjectToWorldNormal(v.normal.xyz);           o.tangentWS = TransformObjectToWorldDir(v.tangent.xyz);           o.bitangentWS = cross(o.normalWS, o.tangentWS) * v.tangent.w * unity_WorldTransformParams.w;           o.viewDir = _WorldSpaceCameraPos.xyz - TransformObjectToWorld(v.vertex.xyz);           o.uv = v.uv.xy * _BaseMap_ST.xy + _BaseMap_ST.zw;           return o;          } //DX5기준으로 Legacy에서의 unpack normal을 그대로 사용. R/5bit, G/6bit, B/5bit, A/8bit를 R>G, G>A로 사용-사람의 눈이 녹색의 변화에 민감하기에 G가 1bit더 크다. mobile에서는 채널 변환 없이 *2.0 - 1.0으로 그냥 계산하게 된다. //URP에서 unpack normal처리는 "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl" 에서 확인할 수 있다.       inline half3 UnpackNormal(half4 packednormal)         {           half3 normal;           normal.xy = packednormal.wy * 2 - 1;           normal.z = sqrt(1 - normal.x * normal.x - normal.y * normal.y);           return normal;          }            inline half3 TangentNormalToWorldNormal(half3 TangnetNormal, half3 T, half3  B, half3 N)            {              float3x3 TBN = float3x3(T, B, N);              TBN = transpose(TBN);              return mul(TBN, TangnetNormal);             }            half4 frag(VertexOutput i) : SV_Target          {              float3 lightDir = _MainLightPosition.xyz;           float3 lightColor = _MainLightColor.rgb;           float3 viewDir = normalize(i.viewDir);           half4 color = _BaseMap.Sample(sampler_BaseMap, i.uv) * _TintColor;           half4 mask = _MaskMap.Sample(sampler_BaseMap, i.uv);           half3 bump = UnpackNormal(_BumpMap.Sample(sampler_BaseMap, i.uv)) ;           float3 worldNormal = TangentNormalToWorldNormal(bump, i.tangentWS, i.bitangentWS, i.normalWS);           float NdotL = saturate(dot(worldNormal, lightDir));           float3 hv = SafeNormalize(lightDir + viewDir);         //  https://github.com/Unity-Technologies/Graphics/blob/master/com.unity.render-pipelines.core/ShaderLibrary/Common.hlsl           float NdotH = saturate(dot(hv, normalize(worldNormal)));                  //Occlusion 처리는 임의로 계산한것이기 때문에 무시한다.           float specular = pow(NdotH, _Glossness * mask.a) * _Specular + mask.g * _OcclusionInten;           half3 ambient = SampleSH(i.normalWS);          //ambient color처리는임의로 계산한 내용. blinnphong 수식에서는 무시한다.           color.rgb = color.rgb * NdotL * lightColor * specular * _SpecColor.rgb  + ambient * (1.0 - NdotL) * _EnviIntensity;           return color;          }    ENDHLSL      }   } }