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unity-shader-tutorial-baseLight

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BaseLight.shader

BaseLight.shader
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Shader "HHF/Tutorial/BaseLight"
{
    Properties
    {
       	_DiffuseColor ("Diffuse Color", Color) = (1, 1, 1, 1)
    	_SpecularColor ("Specular Color", Color) = (1, 1, 1, 1)
		_SpecularGloss ("Gloss Color", Range(8.0, 256)) = 20
    	
    	[KeywordEnum(Phong,BlinnPhong)]_SpecularMode("SpecularMode", int)=0
    }
	
	SubShader
    {
        Tags { "Queue"="Geometry" "RenderType" = "Opaque" "IgnoreProjector" = "True" "RenderPipeline" = "UniversalPipeline" }

        Pass
        {
            HLSLPROGRAM
            // Required to compile gles 2.0 with standard srp library
            #pragma prefer_hlslcc gles
            #pragma exclude_renderers d3d11_9x
            #pragma vertex vert
            #pragma fragment frag
			#pragma shader_feature _ _SPECULARMODE_PHONG _SPECULARMODE_BLINNPHONG	
            #include "Packages/com.unity.render-pipelines.core/ShaderLibrary/Color.hlsl"
            #include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"
            #include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Lighting.hlsl"
            #include "Packages/com.unity.render-pipelines.core/ShaderLibrary/UnityInstancing.hlsl"

            struct appdata {
				float4 vertex : POSITION;
				float3 normal : NORMAL;
			};
			
			struct v2f {
				float4 positionCS : SV_POSITION;
				float3 positionWS : TEXCOORD0;
				float3 normalWS : TEXCOORD1;
			};

            CBUFFER_START(UnityPerMaterial)
			half4 _DiffuseColor;
			half4 _SpecularColor;
			float _SpecularGloss;
			CBUFFER_END
            
			v2f vert(appdata v) {
				v2f o = (v2f)0;
				
				o.positionCS = TransformObjectToHClip(v.vertex.xyz);
				o.normalWS = TransformObjectToWorldNormal(v.normal.xyz);
				o.positionWS = TransformObjectToWorld(v.vertex.xyz);

				return o;
			}
			
			half4 frag(v2f i) : SV_Target {

				half4 c = 1;

				Light mainLight = GetMainLight();

				// 环境光
				half3 ambient = UNITY_LIGHTMODEL_AMBIENT.xyz;
				c.rgb = ambient;

				// 漫反射
				half3 N = normalize(i.normalWS);
				half3 L = normalize(mainLight.direction);
				half3 diffuse = mainLight.color * _DiffuseColor.rgb * saturate(dot(N, L));
				c.rgb += diffuse; // diffuse * 0.5 + 0.5;

				// 高光
				half3 R = normalize(reflect(-L, N));
				half3 V = normalize(_WorldSpaceCameraPos.xyz - i.positionWS.xyz);
				
				#if _SPECULARMODE_PHONG
					// phone
					half ROV = dot(R, V);
					half3 specular = mainLight.color * _SpecularColor.rgb * pow(saturate(ROV), _SpecularGloss);
					c.rgb += specular;
				#endif 
				
				#if _SPECULARMODE_BLINNPHONG
					// blinnphong
					half3 H = normalize(L + V);
					half NOH = dot(N, H);
					half3 specular = mainLight.color * _SpecularColor.rgb * pow(max(0, NOH), _SpecularGloss);
					c.rgb += specular;
				#endif 
				
				return c;
			}
            
            ENDHLSL
        }
    }
	
    SubShader
    {
        Tags { "RenderType"="Opaque" }

        Pass { 
			CGPROGRAM
			
			#pragma vertex vert
			#pragma fragment frag
			#pragma shader_feature _ _SPECULARMODE_PHONG _SPECULARMODE_BLINNPHONG
			#include "Lighting.cginc"
			
			struct appdata {
				float4 vertex : POSITION;
				float3 normal : NORMAL;
			};
			
			struct v2f {
				float4 positionCS : SV_POSITION;
				float3 positionWS : TEXCOORD0;
				float3 normalWS : TEXCOORD1;
			};

			half4 _DiffuseColor;
			half4 _SpecularColor;
			float _SpecularGloss;

			v2f vert(appdata v) {
				v2f o = (v2f)0;
				
				o.positionCS = UnityObjectToClipPos(v.vertex);
				o.normalWS = UnityObjectToWorldNormal(v.normal);
				o.positionWS = mul(UNITY_MATRIX_M, v.vertex);

				return o;
			}
			
			half4 frag(v2f i) : SV_Target {

				half4 c = 1;

				// 环境光
				half3 ambient = UNITY_LIGHTMODEL_AMBIENT.xyz;
				c.rgb = ambient;

				// 漫反射
				half3 N = normalize(i.normalWS);
				half3 L = normalize(_WorldSpaceLightPos0.xyz);
				half3 diffuse = _LightColor0.rgb * _DiffuseColor.rgb * saturate(dot(N, L));
				c.rgb += diffuse; // diffuse * 0.5 + 0.5;

				// 高光
				half3 R = normalize(reflect(-L, N));
				half3 V = normalize(_WorldSpaceCameraPos.xyz - i.positionWS.xyz);
				
				#if _SPECULARMODE_PHONG
					// phone
					half ROV = dot(R, V);
					half3 specular = _LightColor0.rgb * _SpecularColor.rgb * pow(saturate(ROV), _SpecularGloss);
					c.rgb += specular;
				#endif 
				
				#if _SPECULARMODE_BLINNPHONG
					// blinnphong
					half3 H = normalize(L + V);
					half NOH = dot(N, H);
					half3 specular = _LightColor0.rgb * _SpecularColor.rgb * pow(max(0, NOH), _SpecularGloss);
					c.rgb += specular;
				#endif 
				
				return c;
			}
			
			ENDCG
		}
    }
}