UnityShaderBook/Assets/Shaders/Chapter9/Chapter9-ForwardRendering.shader

// Upgrade NOTE: replaced '_LightMatrix0' with 'unity_WorldToLight'
// Upgrade NOTE: replaced '_Object2World' with 'unity_ObjectToWorld'
// Upgrade NOTE: replaced 'mul(UNITY_MATRIX_MVP,*)' with 'UnityObjectToClipPos(*)'

Shader "Unity Shaders Book/Chapter 9/Forward Rendering" {
	Properties {
		_Diffuse ("Diffuse", Color) = (1, 1, 1, 1)
		_Specular ("Specular", Color) = (1, 1, 1, 1)
		_Gloss ("Gloss", Range(8.0, 256)) = 20
	}
	SubShader {
		Tags { "RenderType"="Opaque" }
		
		Pass {
			// Pass for ambient light & first pixel light (directional light)
			Tags { "LightMode"="ForwardBase" }
		
			CGPROGRAM
			
			// Apparently need to add this declaration 
			#pragma multi_compile_fwdbase	
			
			#pragma vertex vert
			#pragma fragment frag
			
			#include "Lighting.cginc"
			
			fixed4 _Diffuse;
			fixed4 _Specular;
			float _Gloss;
			
			struct a2v {
				float4 vertex : POSITION;
				float3 normal : NORMAL;
			};
			
			struct v2f {
				float4 pos : SV_POSITION;
				float3 worldNormal : TEXCOORD0;
				float3 worldPos : TEXCOORD1;
			};
			
			v2f vert(a2v v) {
				v2f o;
				o.pos = UnityObjectToClipPos(v.vertex);
				
				o.worldNormal = UnityObjectToWorldNormal(v.normal);
				
				o.worldPos = mul(unity_ObjectToWorld, v.vertex).xyz;
				
				return o;
			}
			
			fixed4 frag(v2f i) : SV_Target {
				fixed3 worldNormal = normalize(i.worldNormal);
				fixed3 worldLightDir = normalize(_WorldSpaceLightPos0.xyz);
				
				//fixed3 ambient = UNITY_LIGHTMODEL_AMBIENT.xyz;
				fixed3 ambient = ShadeSH9(fixed4(i.worldNormal,1));
			 	fixed3 diffuse = _LightColor0.rgb * _Diffuse.rgb * max(0, dot(worldNormal, worldLightDir));

			 	fixed3 viewDir = normalize(_WorldSpaceCameraPos.xyz - i.worldPos.xyz);
			 	fixed3 halfDir = normalize(worldLightDir + viewDir);
			 	fixed3 specular = _LightColor0.rgb * _Specular.rgb * pow(max(0, dot(worldNormal, halfDir)), _Gloss);

				fixed atten = 1.0;
				
				return fixed4(ambient + (diffuse + specular) * atten, 1.0);
			}
			
			ENDCG
		}
	
		Pass {
			// Pass for other pixel lights
			Tags { "LightMode"="ForwardAdd" }
			
			Blend One One
		
			CGPROGRAM
			
			// Apparently need to add this declaration
			#pragma multi_compile_fwdadd
			
			#pragma vertex vert
			#pragma fragment frag
			
			#include "Lighting.cginc"
			#include "AutoLight.cginc"
			
			fixed4 _Diffuse;
			fixed4 _Specular;
			float _Gloss;
			
			struct a2v {
				float4 vertex : POSITION;
				float3 normal : NORMAL;
			};
			
			struct v2f {
				float4 pos : SV_POSITION;
				float3 worldNormal : TEXCOORD0;
				float3 worldPos : TEXCOORD1;
			};
			
			v2f vert(a2v v) {
				v2f o;
				o.pos = UnityObjectToClipPos(v.vertex);
				
				o.worldNormal = UnityObjectToWorldNormal(v.normal);
				
				o.worldPos = mul(unity_ObjectToWorld, v.vertex).xyz;
				
				return o;
			}
			
			fixed4 frag(v2f i) : SV_Target {
				fixed3 worldNormal = normalize(i.worldNormal);
				#ifdef USING_DIRECTIONAL_LIGHT
					fixed3 worldLightDir = normalize(_WorldSpaceLightPos0.xyz);
				#else
					fixed3 worldLightDir = normalize(_WorldSpaceLightPos0.xyz - i.worldPos.xyz);
				#endif
				
				fixed3 diffuse = _LightColor0.rgb * _Diffuse.rgb * max(0, dot(worldNormal, worldLightDir));
				
				fixed3 viewDir = normalize(_WorldSpaceCameraPos.xyz - i.worldPos.xyz);
				fixed3 halfDir = normalize(worldLightDir + viewDir);
				fixed3 specular = _LightColor0.rgb * _Specular.rgb * pow(max(0, dot(worldNormal, halfDir)), _Gloss);
				
				#ifdef USING_DIRECTIONAL_LIGHT
					// 使用其他平行光
					fixed atten = 1.0;
				#else
					#if defined (POINT)
					// 点光源处理
				        float3 lightCoord = mul(unity_WorldToLight, float4(i.worldPos, 1)).xyz;
				        fixed atten = tex2D(_LightTexture0, dot(lightCoord, lightCoord).rr).UNITY_ATTEN_CHANNEL;
				    #elif defined (SPOT)
					// 聚光源处理
				        float4 lightCoord = mul(unity_WorldToLight, float4(i.worldPos, 1));
				        fixed atten = (lightCoord.z > 0) * tex2D(_LightTexture0, lightCoord.xy / lightCoord.w + 0.5).w * tex2D(_LightTextureB0, dot(lightCoord, lightCoord).rr).UNITY_ATTEN_CHANNEL;
				    #else
				        fixed atten = 1.0;
				    #endif
				#endif

				return fixed4((diffuse + specular) * atten, 1.0);
			}
			
			ENDCG
		}
	}
	FallBack "Specular"
}