#ifndef TOON_MAINLIGHT_INCLUDED
#define TOON_MAINLIGHT_INCLUDED

void MainLight_float(float3 WorldPos, out float3 Direction, out float3 Color, out float ShadowAtten)
{
#ifdef SHADERGRAPH_PREVIEW
    Direction   = normalize(float3(0.5, 0.5, -0.5));
    Color       = 1;
    ShadowAtten = 1;
#else
    float4 shadowCoord = TransformWorldToShadowCoord(WorldPos);
    Light mainLight = GetMainLight();
    Direction   = mainLight.direction;
    Color       = mainLight.color;

    // 直接採樣主光陰影貼圖，繞過 MAIN_LIGHT_CALCULATE_SHADOWS keyword 條件。
    ShadowSamplingData samplingData = GetMainLightShadowSamplingData();
    half4 shadowParams = GetMainLightShadowParams();
    real shadowStrength = shadowParams.x;

    // PCF 過濾採樣 → 柔邊、消鋸齒（不依賴 _SHADOWS_SOFT keyword）
    real atten = SampleShadowmapFiltered(
        TEXTURE2D_ARGS(_MainLightShadowmapTexture, sampler_LinearClampCompare),
        shadowCoord, samplingData);
    atten = LerpWhiteTo(atten, shadowStrength);

    // 超出陰影最遠距離 = 不打陰影
    ShadowAtten = BEYOND_SHADOW_FAR(shadowCoord) ? 1.0 : atten;
#endif
}

#endif