Fog Node

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Data/Nodes/Input/Scene/FogNode.cs

+using UnityEditor.Graphing;
+using UnityEngine;
+using UnityEditor.ShaderGraph.Drawing.Controls;
+using System.Collections.Generic;
+
+namespace UnityEditor.ShaderGraph
+{
+    public enum FogMode
+    {
+        Linear,
+        Exponential,
+        ExponentialSquared
+    };
+
+    [Title("Input/Scene/Fog")]
+    public class FogNode : AbstractMaterialNode, IGeneratesBodyCode, IMayRequirePosition
+    {
+        const string kOutputSlotName = "Color";
+        const string kOutputSlot1Name = "Density";
+
+        public const int OutputSlotId = 0;
+        public const int OutputSlot1Id = 1;
+
+        public FogNode()
+        {
+            name = "Fog";
+            UpdateNodeAfterDeserialization();
+        }
+
+        public sealed override void UpdateNodeAfterDeserialization()
+        {
+            AddSlot(new Vector4MaterialSlot(OutputSlotId, kOutputSlotName, kOutputSlotName, SlotType.Output, Vector4.zero));
+            AddSlot(new Vector1MaterialSlot(OutputSlot1Id, kOutputSlot1Name, kOutputSlot1Name, SlotType.Output, 0));
+            RemoveSlotsNameNotMatching(new[] { OutputSlotId, OutputSlot1Id });
+        }
+
+        public void GenerateNodeCode(ShaderGenerator visitor, GenerationMode generationMode)
+        {
+            string uvValue = GetSlotValue(OutputSlotId, generationMode);
+            string outputValue = GetSlotValue(OutputSlot1Id, generationMode);
+
+            visitor.AddShaderChunk(string.Format("{0} {1} = unity_FogColor;",
+                ConvertConcreteSlotValueTypeToString(precision, FindOutputSlot<MaterialSlot>(OutputSlotId).concreteValueType),
+                GetVariableNameForSlot(OutputSlotId)), true);
+
+            visitor.AddShaderChunk(string.Format("{0} clipZ_01 = UNITY_Z_0_FAR_FROM_CLIPSPACE(UnityObjectToClipPos(IN.ObjectSpacePosition).z);", precision), true);
+            visitor.AddShaderChunk("#if defined(FOG_LINEAR)", true);
+            visitor.Indent();
+            visitor.AddShaderChunk(string.Format("{0} fogFactor = saturate(clipZ_01 * unity_FogParams.z + unity_FogParams.w);", precision), true);
+            visitor.AddShaderChunk(string.Format("{0} {1} = fogFactor;",
+                ConvertConcreteSlotValueTypeToString(precision, FindOutputSlot<MaterialSlot>(OutputSlot1Id).concreteValueType),
+                GetVariableNameForSlot(OutputSlot1Id)), true);
+            visitor.Deindent();
+            visitor.AddShaderChunk("#elif defined(FOG_EXP)", true);
+            visitor.Indent();
+            visitor.AddShaderChunk(string.Format("{0} fogFactor = unity_FogParams.y * clipZ_01;", precision), true);
+            visitor.AddShaderChunk(string.Format("{0} {1} = {2}(saturate(exp2(-fogFactor)));",
+                ConvertConcreteSlotValueTypeToString(precision, FindOutputSlot<MaterialSlot>(OutputSlot1Id).concreteValueType),
+                GetVariableNameForSlot(OutputSlot1Id), precision), true);
+            visitor.Deindent();
+            visitor.AddShaderChunk("#elif defined(FOG_EXP2)", true);
+            visitor.Indent();
+            visitor.AddShaderChunk(string.Format("{0} fogFactor = unity_FogParams.x * clipZ_01;", precision), true);
+            visitor.AddShaderChunk(string.Format("{0} {1} = {2}(saturate(exp2(-fogFactor*fogFactor)));",
+                ConvertConcreteSlotValueTypeToString(precision, FindOutputSlot<MaterialSlot>(OutputSlot1Id).concreteValueType),
+                GetVariableNameForSlot(OutputSlot1Id), precision), true);
+            visitor.Deindent();
+            visitor.AddShaderChunk("#else", true);
+            visitor.Indent();
+            visitor.AddShaderChunk(string.Format("{0} {1} = 0.0h;",
+                ConvertConcreteSlotValueTypeToString(precision, FindOutputSlot<MaterialSlot>(OutputSlot1Id).concreteValueType),
+                GetVariableNameForSlot(OutputSlot1Id)), true);
+            visitor.Deindent();
+            visitor.AddShaderChunk("#endif", true);
+        }
+
+        public NeededCoordinateSpace RequiresPosition()
+        {
+            return CoordinateSpace.Object.ToNeededCoordinateSpace();
+        }
+    }
+}

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Data/Nodes/Input/Scene/FogNode.cs.meta

+fileFormatVersion: 2
+guid: f934acb3f675022448ac439d87d84a80
+MonoImporter:
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: