1 files changed, 78 insertions, 0 deletions
diff --git a/Assets/AmplifyShaderEditor/Plugins/Editor/Nodes/Operators/ScaleAndOffsetNode.cs b/Assets/AmplifyShaderEditor/Plugins/Editor/Nodes/Operators/ScaleAndOffsetNode.cs
new file mode 100644
index 00000000..0d79fe81
--- /dev/null
+++ b/Assets/AmplifyShaderEditor/Plugins/Editor/Nodes/Operators/ScaleAndOffsetNode.cs
@@ -0,0 +1,78 @@
+// Amplify Shader Editor - Visual Shader Editing Tool
+// Copyright (c) Amplify Creations, Lda <info@amplify.pt>
+using System;
+
+namespace AmplifyShaderEditor
+{
+	[Serializable]
+	[NodeAttributes( "Scale And Offset", "Math Operators", "Scales and offsets an input value\n( ( <b>Value</b> * <b>Scale</b> ) + <b>Offset</b> )" )]
+	public sealed class ScaleAndOffsetNode : ParentNode
+	{
+		private const string ScaleOffsetOpStr = "({0}*{1} + {2})";
+		protected override void CommonInit( int uniqueId )
+		{
+			base.CommonInit( uniqueId );
+			AddInputPort( WirePortDataType.FLOAT, false, Constants.EmptyPortValue );
+			AddInputPort( WirePortDataType.FLOAT, false, "Scale" );
+			m_inputPorts[ 1 ].FloatInternalData = 1;
+			AddInputPort( WirePortDataType.FLOAT, false, "Offset" );
+			AddOutputPort( WirePortDataType.FLOAT, " " );
+			m_useInternalPortData = true;
+			m_previewShaderGUID = "a1f1053d4d9c3be439e0382038b74771";
+		}
+
+		public override void OnInputPortConnected( int portId, int otherNodeId, int otherPortId, bool activateNode = true )
+		{
+			base.OnInputPortConnected( portId, otherNodeId, otherPortId, activateNode );
+			UpdateConnection( portId );
+		}
+
+		public override void OnConnectedOutputNodeChanges( int inputPortId, int otherNodeId, int otherPortId, string name, WirePortDataType type )
+		{
+			base.OnConnectedOutputNodeChanges( inputPortId, otherNodeId, otherPortId, name, type );
+			UpdateConnection( inputPortId );
+		}
+
+		public override void OnInputPortDisconnected( int portId )
+		{
+			base.OnInputPortDisconnected( portId );
+			m_inputPorts[ portId ].ChangeType( WirePortDataType.FLOAT, false );
+			if( portId == 0 )
+			{
+				m_outputPorts[ 0 ].ChangeType( WirePortDataType.FLOAT, false );
+			}
+		}
+
+		void UpdateConnection( int portId )
+		{
+			if( portId == 0 )
+			{
+				m_inputPorts[ 0 ].MatchPortToConnection();
+				m_outputPorts[ 0 ].ChangeType( m_inputPorts[ 0 ].DataType, false );
+			}
+			else
+			{
+				WirePortDataType newDataType = m_inputPorts[ portId ].ConnectionType() == WirePortDataType.FLOAT ? WirePortDataType.FLOAT : m_outputPorts[ 0 ].DataType;
+				m_inputPorts[ portId ].ChangeType( newDataType, false );
+			}
+		}
+		
+		public override string GenerateShaderForOutput( int outputId,  ref MasterNodeDataCollector dataCollector, bool ignoreLocalvar )
+		{
+			if ( m_outputPorts[ 0 ].IsLocalValue( dataCollector.PortCategory ) )
+				return m_outputPorts[ 0 ].LocalValue( dataCollector.PortCategory );
+
+            string value = m_inputPorts[ 0 ].GeneratePortInstructions( ref dataCollector );
+
+			// If scale or offset ports are floats then there's no need to cast them to any other type since they can be multiplied with everything
+			WirePortDataType scaleType = ( m_inputPorts[ 1 ].ConnectionType() == WirePortDataType.FLOAT ) ? WirePortDataType.FLOAT : m_outputPorts[ 0 ].DataType;
+			string scale =  m_inputPorts[ 1 ].GenerateShaderForOutput( ref dataCollector, scaleType, ignoreLocalvar , true );
+
+			WirePortDataType offsetType = ( m_inputPorts[ 2 ].ConnectionType() == WirePortDataType.FLOAT ) ? WirePortDataType.FLOAT : m_outputPorts[ 0 ].DataType;
+			string offset = m_inputPorts[ 2 ].GenerateShaderForOutput( ref dataCollector, offsetType, ignoreLocalvar, true );
+			
+			string result = string.Format( ScaleOffsetOpStr, value, scale, offset );
+			return CreateOutputLocalVariable( 0, result, ref dataCollector );
+		}
+	}
+}