#ifndef DIFFUSE_INCLUDE
    #define DIFFUSE_INCLUDE
    struct VertexInput
    {
        float4 vertex : POSITION;
        float3 normal : NORMAL;
        float4 tangent : TANGENT;
        float4 color : COLOR;
        float2 uv : TEXCOORD0;
        UNITY_VERTEX_INPUT_INSTANCE_ID
    };

    struct VertexOutput
    {
        float4 pos : SV_POSITION;
        float4 uv : TEXCOORD0;
        float4 normalDir : TEXCOORD1;
        float3 tangentDir : TEXCOORD2;
        float3 bitangentDir : TEXCOORD3;
        float4 posWorld : TEXCOORD4;
        LIGHTING_COORDS(5,6)
        UNITY_FOG_COORDS(7)
        //UNITY_VERTEX_INPUT_INSTANCE_ID
    };
    inline half3 Diffuse(fixed3 _normalMap,fixed4 _mainTex,VertexOutput i)
    {
        fixed3 _lightDir = normalize(_WorldSpaceLightPos0.xyz);//光照方向
        fixed _NdotL = saturate(dot(_normalMap, _lightDir));//漫反射强度
        fixed3 _finalDiffuse = _NdotL * _LightColor0.xyz;//主平行光源颜色
        _finalDiffuse *= LIGHT_ATTENUATION(i);//接收投影
        _finalDiffuse += UNITY_LIGHTMODEL_AMBIENT.rgb;//环境色
        return _finalDiffuse;
    }
#endif