1 files changed, 54 insertions, 0 deletions
diff --git a/Assets/ThirdParty/AmplifyShaderEditor/Plugins/Editor/Nodes/HelperFuncs/ComputeGrabScreenPosHlpNode.cs b/Assets/ThirdParty/AmplifyShaderEditor/Plugins/Editor/Nodes/HelperFuncs/ComputeGrabScreenPosHlpNode.cs
new file mode 100644
index 00000000..362415d3
--- /dev/null
+++ b/Assets/ThirdParty/AmplifyShaderEditor/Plugins/Editor/Nodes/HelperFuncs/ComputeGrabScreenPosHlpNode.cs
@@ -0,0 +1,54 @@
+// Amplify Shader Editor - Visual Shader Editing Tool
+// Copyright (c) Amplify Creations, Lda <info@amplify.pt>
+
+using System;
+namespace AmplifyShaderEditor
+{
+	[Serializable]
+	[NodeAttributes( "Compute Grab Screen Pos", "Camera And Screen", "Computes texture coordinate for doing a screenspace-mapped texture sample. Input is clip space position" )]
+	public sealed class ComputeGrabScreenPosHlpNode : HelperParentNode
+	{
+		private readonly string[] ComputeGrabScreenPosFunction =
+		{
+			"inline float4 ComputeGrabScreenPos( float4 pos )\n",
+			"{\n",
+			"#if UNITY_UV_STARTS_AT_TOP\n",
+			"\tfloat scale = -1.0;\n",
+			"#else\n",
+			"\tfloat scale = 1.0;\n",
+			"#endif\n",
+			"\tfloat4 o = pos * 0.5f;\n",
+			"\to.xy = float2( o.x, o.y*scale ) + o.w;\n",
+			"#ifdef UNITY_SINGLE_PASS_STEREO\n",
+			"\to.xy = TransformStereoScreenSpaceTex ( o.xy, pos.w );\n",
+			"#endif\n",
+			"\to.zw = pos.zw;\n",
+			"\treturn o;\n",
+			"}\n"
+		};
+
+		protected override void CommonInit( int uniqueId )
+		{
+			base.CommonInit( uniqueId );
+			m_funcType = "ComputeGrabScreenPos";
+			m_inputPorts[ 0 ].ChangeType( WirePortDataType.FLOAT4, false );
+			m_outputPorts[ 0 ].ChangeType( WirePortDataType.FLOAT4, false );
+			m_outputPorts[ 0 ].Name = "XYZW";
+		}
+
+		protected override void OnUniqueIDAssigned()
+		{
+			base.OnUniqueIDAssigned();
+			m_localVarName = "computeGrabScreenPos" + OutputId;
+		}
+
+		public override string GenerateShaderForOutput( int outputId, ref MasterNodeDataCollector dataCollector, bool ignoreLocalvar )
+		{
+			if( dataCollector.IsTemplate && dataCollector.TemplateDataCollectorInstance.CurrentSRPType == TemplateSRPType.HD )
+			{
+				dataCollector.AddFunction( m_funcType, ComputeGrabScreenPosFunction, false );
+			}
+			return base.GenerateShaderForOutput( outputId, ref dataCollector, ignoreLocalvar );
+		}
+	}
+}