Unity BlinnPhong 高光 Shader

http://docs.unity3d.com/Manual/SL-SurfaceShaderLightingExamples.html

Shader "Custom/SimpleSpecularSurfaceShader"
{
    Properties {
        _Color ("Color", Color) = (1,1,1,1)
        _MainTex ("Albedo (RGB)", 2D) = "white" {}
    }
    SubShader {
        Tags { "RenderType"="Opaque" }
        LOD 200

        CGPROGRAM

#pragma surface surf SimpleSpecular fullforwardshadows

        // Use shader model 3.0 target, to get nicer looking lighting
#pragma target 3.0

        sampler2D _MainTex;

        fixed4 LightingSimpleSpecular(SurfaceOutput s, fixed3 lightDir, half3 viewDir, fixed atten)
        {
            half3 h = normalize(lightDir + viewDir);

            half diff = max(0, dot(s.Normal, lightDir));

            float nh = max(0, dot(s.Normal, h));
            float spec = pow(nh, 48.0);

            half4 c;
            c.rgb = (s.Albedo * _LightColor0.rgb * diff + _LightColor0.rgb * spec) * atten;
            c.a = s.Alpha;
            return c;
        }

        struct Input {
            float2 uv_MainTex;
        };

        fixed4 _Color;

        void surf (Input IN, inout SurfaceOutput o)
        {
            // Albedo comes from a texture tinted by color
            fixed4 c = tex2D (_MainTex, IN.uv_MainTex) * _Color;
            o.Albedo = c.rgb;
            o.Alpha = c.a;
        }
        ENDCG
    }
    FallBack "Diffuse"
}