Added UtsSingleLightLoop

Runtime/Shaders/Includes/Lighting/UtsSingleLightLoop.hlsl

@@ -0,0 +1,59 @@
+#ifndef UTS_SINGLE_LIGHT_LOOP
+#define UTS_SINGLE_LIGHT_LOOP
+
+#include "Packages/com.misaki.hdrp-toon/Runtime/Models/SurfaceFeature.cs.hlsl"
+#include "Packages/com.misaki.hdrp-toon/Runtime/Shaders/Includes/Common/UtsSurfaceFeatureEvaluation.hlsl"
+#include "Packages/com.misaki.hdrp-toon/Runtime/Shaders/Includes/Lighting/UtsLightEvaluation.hlsl"
+
+struct UtsSingleMainLight
+{
+    GPULightType lightType;
+    uint lightIndex;
+};
+
+int GetMainLightIndex(BuiltinData builtinData)
+{
+    int mainLightIndex = -1;
+
+    if (featureFlags & LIGHTFEATUREFLAGS_DIRECTIONAL)
+    {
+        DirectionalLightData light = _DirectionalLightDatas[_DirectionalShadowIndex];
+
+        if ((light.lightDimmer > 0) && (light.shadowDimmer > 0) && IsMatchingLightLayer(light.lightLayers, builtinData.renderingLayers))
+        {
+            SHADOW_TYPE shadowValue = GetDirectionalShadowAttenuation(context.shadowContext,
+                                        posInput.positionSS, _ObjectCenterPositionWS + L * _ShadowDistanceBias, UtsGetShadowNormal(bsdfData),
+                                        light.shadowIndex, L);
+
+            if (length(shadowValue) > 0.0)
+            {
+                mainLightIndex = _DirectionalShadowIndex;
+            }
+        }
+    }
+
+     return mainLightIndex;
+}
+
+// TODO: The process of finding main light index should be move to vertex stage
+void UtsSingleLightLoop(FragInputs fragInputs, PositionInputs posInput, UtsBSDFData bsdfData, BuiltinData builtinData,
+    float3 V, uint featureFlags, out LightLoopOutput lightLoopOutput)
+{
+    PreLightData preLightData = GetPreLightData_UTS(V, posInput, bsdfData);
+    
+    AggregateLighting aggregateLighting;
+    ZERO_INITIALIZE(AggregateLighting, aggregateLighting);
+
+#if _USER_LIGHT_SOURCE_LOOP_ON
+    
+#else
+    int mainLightIndex = GetMainLightIndex(builtinData);
+    
+    if (mainLightIndex != -1 && featureFlags & LIGHTFEATUREFLAGS_PUNCTUAL)
+    {
+        
+    }
+#endif
+}
+
+#endif