feat(shader): add toon shader and main light custom function

Assets/Main.unity

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Assets/Resources/Toon.cginc

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+#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

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