1 files changed, 148 insertions, 0 deletions
diff --git a/Assets/AmplifyShaderEditor/Plugins/Editor/Nodes/HelperFuncs/ParallaxMappingNode.cs b/Assets/AmplifyShaderEditor/Plugins/Editor/Nodes/HelperFuncs/ParallaxMappingNode.cs
new file mode 100644
index 00000000..929f41ba
--- /dev/null
+++ b/Assets/AmplifyShaderEditor/Plugins/Editor/Nodes/HelperFuncs/ParallaxMappingNode.cs
@@ -0,0 +1,148 @@
+using UnityEngine;
+using UnityEditor;
+
+using System;
+namespace AmplifyShaderEditor
+{
+	[Serializable]
+	[NodeAttributes( "Parallax Mapping", "UV Coordinates", "Calculates offseted UVs for parallax mapping" )]
+	public sealed class ParallaxMappingNode : ParentNode
+	{
+		private enum ParallaxType { Normal, Planar }
+
+		[SerializeField]
+		private int m_selectedParallaxTypeInt = 0;
+
+		[SerializeField]
+		private ParallaxType m_selectedParallaxType = ParallaxType.Normal;
+
+		private readonly string[] m_parallaxTypeStr = { "Normal", "Planar" };
+
+		private int m_cachedPropertyId = -1;
+
+		private UpperLeftWidgetHelper m_upperLeftWidget = new UpperLeftWidgetHelper();
+
+		protected override void CommonInit( int uniqueId )
+		{
+			base.CommonInit( uniqueId );
+			AddInputPort( WirePortDataType.FLOAT2, false, "UV" );
+			AddInputPort( WirePortDataType.FLOAT, false, "Height" );
+			AddInputPort( WirePortDataType.FLOAT, false, "Scale" );
+			AddInputPort( WirePortDataType.FLOAT3, false, "ViewDir (tan)" );
+			AddOutputPort( WirePortDataType.FLOAT2, "Out" );
+			m_useInternalPortData = true;
+			m_autoDrawInternalPortData = true;
+			m_autoWrapProperties = true;
+			m_textLabelWidth = 105;
+			UpdateTitle();
+			m_forceDrawPreviewAsPlane = true;
+			m_hasLeftDropdown = true;
+			m_previewShaderGUID = "589f12f68e00ac74286815aa56053fcc";
+		}
+
+		public override void Destroy()
+		{
+			base.Destroy();
+			m_upperLeftWidget = null;
+		}
+
+		public override void SetPreviewInputs()
+		{
+			base.SetPreviewInputs();
+
+			if( m_cachedPropertyId == -1 )
+				m_cachedPropertyId = Shader.PropertyToID( "_ParallaxType" );
+
+			PreviewMaterial.SetFloat( m_cachedPropertyId, ( m_selectedParallaxType == ParallaxType.Normal ? 0 : 1 ) );
+		}
+
+		public override string GenerateShaderForOutput( int outputId, ref MasterNodeDataCollector dataCollector, bool ignoreLocalvar )
+		{
+			base.GenerateShaderForOutput( outputId, ref dataCollector, ignoreLocalvar );
+
+			string textcoords = m_inputPorts[ 0 ].GeneratePortInstructions( ref dataCollector );
+			string height = m_inputPorts[ 1 ].GeneratePortInstructions( ref dataCollector );
+			string scale = m_inputPorts[ 2 ].GeneratePortInstructions( ref dataCollector );
+			string viewDirTan = m_inputPorts[ 3 ].GeneratePortInstructions( ref dataCollector );
+			string localVarName = "Offset" + OutputId;
+			string calculation = "";
+
+			switch( m_selectedParallaxType )
+			{
+				default:
+				case ParallaxType.Normal:
+				calculation = "( ( " + height + " - 1 ) * " + viewDirTan + ".xy * " + scale + " ) + " + textcoords;
+				break;
+				case ParallaxType.Planar:
+				calculation = "( ( " + height + " - 1 ) * ( " + viewDirTan + ".xy / " + viewDirTan + ".z ) * " + scale + " ) + " + textcoords;
+				break;
+			}
+
+			dataCollector.AddLocalVariable( UniqueId, CurrentPrecisionType, m_outputPorts[ 0 ].DataType, localVarName, calculation );
+			//dataCollector.AddToLocalVariables( UniqueId, m_currentPrecisionType, m_outputPorts[ 0 ].DataType, localVarName, calculation );
+			return GetOutputVectorItem( 0, outputId, localVarName );
+		}
+
+		public override void Draw( DrawInfo drawInfo )
+		{
+			base.Draw( drawInfo );
+			EditorGUI.BeginChangeCheck();
+			m_selectedParallaxTypeInt = m_upperLeftWidget.DrawWidget( this, m_selectedParallaxTypeInt, m_parallaxTypeStr );
+			if( EditorGUI.EndChangeCheck() )
+			{
+				switch( m_selectedParallaxTypeInt )
+				{
+					default:
+					case 0: m_selectedParallaxType = ParallaxType.Normal; break;
+					case 1: m_selectedParallaxType = ParallaxType.Planar; break;
+				}
+				UpdateTitle();
+			}
+		}
+
+		public override void DrawProperties()
+		{
+			base.DrawProperties();
+			
+			EditorGUI.BeginChangeCheck();
+			m_selectedParallaxTypeInt = EditorGUILayoutPopup( "Parallax Type", m_selectedParallaxTypeInt, m_parallaxTypeStr );
+			if( EditorGUI.EndChangeCheck() )
+			{
+				switch( m_selectedParallaxTypeInt )
+				{
+					default:
+					case 0: m_selectedParallaxType = ParallaxType.Normal; break;
+					case 1: m_selectedParallaxType = ParallaxType.Planar; break;
+				}
+				UpdateTitle();
+			}
+
+			EditorGUILayout.HelpBox( "Normal type does a cheaper approximation thats view dependent while Planar is more accurate but generates higher aliasing artifacts at steep angles.", MessageType.None );
+		}
+
+
+		void UpdateTitle()
+		{
+			m_additionalContent.text = string.Format( Constants.SubTitleTypeFormatStr, m_parallaxTypeStr[ m_selectedParallaxTypeInt ] );
+		}
+
+		public override void ReadFromString( ref string[] nodeParams )
+		{
+			base.ReadFromString( ref nodeParams );
+			m_selectedParallaxType = (ParallaxType)Enum.Parse( typeof( ParallaxType ), GetCurrentParam( ref nodeParams ) );
+			switch( m_selectedParallaxType )
+			{
+				default:
+				case ParallaxType.Normal: m_selectedParallaxTypeInt = 0; break;
+				case ParallaxType.Planar: m_selectedParallaxTypeInt = 1; break;
+			}
+			UpdateTitle();
+		}
+
+		public override void WriteToString( ref string nodeInfo, ref string connectionsInfo )
+		{
+			base.WriteToString( ref nodeInfo, ref connectionsInfo );
+			IOUtils.AddFieldValueToString( ref nodeInfo, m_selectedParallaxType );
+		}
+	}
+}