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32 lines
1.1 KiB
32 lines
1.1 KiB
#ifndef TOON_MAINLIGHT_INCLUDED
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#define TOON_MAINLIGHT_INCLUDED
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void MainLight_float(float3 WorldPos, out float3 Direction, out float3 Color, out float ShadowAtten)
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{
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#ifdef SHADERGRAPH_PREVIEW
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Direction = normalize(float3(0.5, 0.5, -0.5));
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Color = 1;
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ShadowAtten = 1;
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#else
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float4 shadowCoord = TransformWorldToShadowCoord(WorldPos);
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Light mainLight = GetMainLight();
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Direction = mainLight.direction;
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Color = mainLight.color;
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// 直接採樣主光陰影貼圖，繞過 MAIN_LIGHT_CALCULATE_SHADOWS keyword 條件。
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ShadowSamplingData samplingData = GetMainLightShadowSamplingData();
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half4 shadowParams = GetMainLightShadowParams();
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real shadowStrength = shadowParams.x;
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// PCF 過濾採樣 → 柔邊、消鋸齒（不依賴 _SHADOWS_SOFT keyword）
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real atten = SampleShadowmapFiltered(
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TEXTURE2D_ARGS(_MainLightShadowmapTexture, sampler_LinearClampCompare),
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shadowCoord, samplingData);
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atten = LerpWhiteTo(atten, shadowStrength);
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// 超出陰影最遠距離 = 不打陰影
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ShadowAtten = BEYOND_SHADOW_FAR(shadowCoord) ? 1.0 : atten;
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#endif
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}
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#endif
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