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Shader "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 = mul(UNITY_MATRIX_MVP, 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 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);                return fixed4(ambient + (diffuse + specular) , 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 = mul(UNITY_MATRIX_MVP, v.vertex);                o.worldNormal = UnityObjectToWorldNormal(v.normal);                o.worldPos = mul(unity_ObjectToWorld, v.vertex).xyz;                return o;            }            // 不在需要环境光的叠加，在BasePass中已经计算过环境光的影响了，多次叠加会导致色彩异常            fixed4 frag(v2f i) : SV_Target {                fixed3 worldNormal = normalize(i.worldNormal);                #ifdef USING_DIRECTIONAL_LIGHT                    // 平行光直接可获取到 顶点到灯光的方向                    fixed3 worldLightDir = normalize(_WorldSpaceLightPos0.xyz);                #else                    // 如果是其他类型的灯光还需要进一步手动计算                    fixed3 worldLightDir = normalize(_WorldSpaceLightPos0.xyz - i.worldPos.xyz);                #endif                // 1.漫反射                fixed3 diffuse = _LightColor0.rgb * _Diffuse.rgb * max(0, dot(worldNormal, worldLightDir));                fixed3 viewDir = normalize(_WorldSpaceCameraPos.xyz - i.worldPos.xyz);                fixed3 halfDir = normalize(worldLightDir + viewDir);                // 2.高光反射                fixed3 specular = _LightColor0.rgb * _Specular.rgb * pow(max(0, dot(worldNormal, halfDir)), _Gloss);                // 3.计算光照衰减 attenuation                #ifdef USING_DIRECTIONAL_LIGHT                    fixed atten = 1.0;                #else                    #if defined (POINT)                        // 计算顶点到光源的 光源空间位置 【注意：是unity_WorldToLight】                        float3 lightCoord = mul(unity_WorldToLight, float4(i.worldPos, 1)).xyz;                        // _LightTexture0用来计算光照衰减，如果用了cookie，需要使用_LightTextureB0来计算                        fixed atten = tex2D(_LightTexture0, dot(lightCoord, lightCoord).rr).UNITY_ATTEN_CHANNEL;                    #elif defined (SPOT)                        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"}

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