#ifndef CUSTOM_UNLIT_PASS_INCLUDED
#define CUSTOM_UNLIT_PASS_INCLUDED

// 顶点函数输入结构体
struct Attributes
{
    float3 positionOS : POSITION;
    float2 baseUV : TEXCOORD0;
    UNITY_VERTEX_INPUT_INSTANCE_ID
};

// 片元函数输入结构体
struct Varyings
{
    float4 positionCS : SV_POSITION;
    float2 baseUV : VAR_BASE_UV;
    UNITY_VERTEX_INPUT_INSTANCE_ID
};

// 顶点函数
Varyings UnlitPassVertex(Attributes input)
{
    Varyings output;
    UNITY_SETUP_INSTANCE_ID(input);
    // 使UnityPassVertex输出位置和索引，并复制索引
    UNITY_TRANSFER_INSTANCE_ID(input, output);
    float3 positionWS = TransformObjectToWorld(input.positionOS);
    output.positionCS = TransformWorldToHClip(positionWS);
    output.baseUV = TransformBaseUV(input.baseUV);
    return output;
}

// 片元函数
float4 UnlitPassFragment(Varyings input) : SV_TARGET
{
    UNITY_SETUP_INSTANCE_ID(input);
    float4 baseMap = SAMPLE_TEXTURE2D(_BaseMap, sampler_BaseMap, input.baseUV);
    float4 base = GetBase(input.baseUV);
    #if defined(_CLIPPING)
        // 透明度低于阈值的片元进行舍弃
        clip(base.a - GetCutoff(input.baseUV));
    #endif
    return base;
}

#endif