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_Color ("颜色", Color) = (1, 1, 1, 1)
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_MainTex ("主纹理", 2D) = "white" {}
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_Specular ("高光反射颜色", Color) = (1, 1, 1, 1)
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_Gloss ("光泽度", Range(8.0, 256)) = 20

1
fixed4 _Color;
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sampler2D _MainTex;//纹理
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float4 _MainTex_ST;//纹理属性
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fixed4 _Specular;
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float _Gloss;

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Shader "Custom/SingleTexture"
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{
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    Properties
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    {
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        _Color ("颜色", Color) = (1, 1, 1, 1)
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        _MainTex ("主纹理", 2D) = "white" {}
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        _Specular ("高光反射颜色", Color) = (1, 1, 1, 1)
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        _Gloss ("光泽度", Range(8.0, 256)) = 20
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    }
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    SubShader
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    {
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        Pass
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        {
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            Tags { "LightMode" = "ForwardBase" }
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            CGPROGRAM
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            #pragma vertex vert
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            #pragma fragment frag
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            #include "Lighting.cginc"
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            fixed4 _Color;
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            sampler2D _MainTex;//纹理
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            float4 _MainTex_ST;//纹理属性
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            fixed4 _Specular;
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            float _Gloss;
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            struct a2v
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            {
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                float4 vertex :POSITION;
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                float3 normal : NORMAL;
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                float4 texcoord : TEXCOORD0;
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            };
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            struct v2f
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            {
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                float4 pos : SV_POSITION;
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                float3 worldNormal : TEXCOORD0;
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                float3 worldPos : TEXCOORD1;
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                float2 uv : TEXCOORD2;
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            };
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            v2f vert(a2v v)
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            {
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                v2f o;
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                o.pos = UnityObjectToClipPos(v.vertex);
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                o.worldNormal = UnityObjectToWorldNormal(v.normal);
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                o.worldPos = mul(unity_ObjectToWorld, v.vertex).xyz;
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                o.uv = v.texcoord.xy * _MainTex_ST.xy + _MainTex_ST.zw;
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                return o;
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            }
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            fixed4 frag(v2f i) : SV_Target
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            {
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                //计算材质反射率
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                fixed3 albedo = tex2D(_MainTex, i.uv).rgb * _Color.rgb;
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                //获取环境光的颜色和强度
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                fixed3 ambient = UNITY_LIGHTMODEL_AMBIENT.xyz;
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                //获取世界坐标系下的法向量
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                fixed3 worldNormal = normalize(i.worldNormal);
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                //获取光源方向
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                fixed3 worldLightDir = normalize(UnityWorldSpaceLightDir(i.worldPos));
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                //计算漫反射强度
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                fixed3 diffuse = _LightColor0.rgb * albedo * max(0, dot(worldNormal, worldLightDir));
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                //获取视角方向
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                fixed3 viewDir = normalize(UnityWorldSpaceViewDir(i.worldPos));
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                //获取反射方向
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                fixed3 halfDir = normalize(worldLightDir + viewDir);
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                //计算高光反射(BlinnPhone模型)
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                fixed3 specular = _LightColor0.rgb * _Specular.rgb * pow(max(0, dot(worldNormal, halfDir)), _Gloss);
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                fixed3 color = ambient + diffuse + specular;
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                return fixed4(color, 1.0);
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            }
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            ENDCG
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        }
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    }
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    FallBack "Specular"
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}