Add Dither node

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Data/Nodes/Artistic/Filter.meta

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MaterialGraphProject/Assets/UnityShaderEditor/Editor/Data/Nodes/Artistic/Filter/DitherNode.cs

+using System.Reflection;
+using UnityEngine;
+using UnityEditor.Graphing;
+namespace UnityEditor.ShaderGraph
+{
+    [Title("Artistic", "Filter", "Dither")]
+    public class DitherNode : CodeFunctionNode
+    {
+        public DitherNode()
+        {
+            name = "Dither";
+            UpdateNodeAfterDeserialization();
+        }
+        protected override MethodInfo GetFunctionToConvert()
+        {
+            return GetType().GetMethod("Unity_Dither", BindingFlags.Static | BindingFlags.NonPublic);
+        }
+        static string Unity_Dither(
+            [Slot(0, Binding.None)] DynamicDimensionVector In,
+            [Slot(1, Binding.ScreenPosition)] Vector2 UV,
+            [Slot(2, Binding.None)] out DynamicDimensionVector Out)
+        {
+            return
+                @"
+{
+    {precision}2 uv = (UV.xy / UV.w) * _ScreenParams.xy;
+    {precision} DITHER_THRESHOLDS[16] =
+    {
+        1.0 / 17.0,  9.0 / 17.0,  3.0 / 17.0, 11.0 / 17.0,
+        13.0 / 17.0,  5.0 / 17.0, 15.0 / 17.0,  7.0 / 17.0,
+        4.0 / 17.0, 12.0 / 17.0,  2.0 / 17.0, 10.0 / 17.0,
+        16.0 / 17.0,  8.0 / 17.0, 14.0 / 17.0,  6.0 / 17.0
+    };
+    uint index = (uint(uv.x) % 4) * 4 + uint(uv.y) % 4;
+    Out = In - DITHER_THRESHOLDS[index];
+}";
+        }
+    }
+}

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Data/Nodes/Artistic/Filter/DitherNode.cs.meta

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