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// 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 );
}
}
}
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