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138 lines
4.1 KiB
138 lines
4.1 KiB
// Amplify Shader Editor - Visual Shader Editing Tool
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// Copyright (c) Amplify Creations, Lda <info@amplify.pt>
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// 4x4 Invert by DBN in
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// http://answers.unity3d.com/questions/218333/shader-inversefloat4x4-function.html?childToView=641391#answer-641391
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using System;
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namespace AmplifyShaderEditor
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{
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[Serializable]
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[NodeAttributes( "Inverse", "Matrix Operators", "Inverse matrix of a matrix" )]
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public sealed class InverseOpNode : SingleInputOp
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{
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private string Inverse4x4Header = "Inverse4x4( {0} )";
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//4x4
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private string[] Inverse4x4Function =
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{
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"{0}4x4 Inverse4x4({0}4x4 input)\n",
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"{\n",
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"\t#define minor(a,b,c) determinant({0}3x3(input.a, input.b, input.c))\n",
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"\t{0}4x4 cofactors = {0}4x4(\n",
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"\tminor( _22_23_24, _32_33_34, _42_43_44 ),\n",
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"\t-minor( _21_23_24, _31_33_34, _41_43_44 ),\n",
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"\tminor( _21_22_24, _31_32_34, _41_42_44 ),\n",
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"\t-minor( _21_22_23, _31_32_33, _41_42_43 ),\n",
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"\n",
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"\t-minor( _12_13_14, _32_33_34, _42_43_44 ),\n",
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"\tminor( _11_13_14, _31_33_34, _41_43_44 ),\n",
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"\t-minor( _11_12_14, _31_32_34, _41_42_44 ),\n",
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"\tminor( _11_12_13, _31_32_33, _41_42_43 ),\n",
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"\n",
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"\tminor( _12_13_14, _22_23_24, _42_43_44 ),\n",
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"\t-minor( _11_13_14, _21_23_24, _41_43_44 ),\n",
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"\tminor( _11_12_14, _21_22_24, _41_42_44 ),\n",
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"\t-minor( _11_12_13, _21_22_23, _41_42_43 ),\n",
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"\n",
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"\t-minor( _12_13_14, _22_23_24, _32_33_34 ),\n",
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"\tminor( _11_13_14, _21_23_24, _31_33_34 ),\n",
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"\t-minor( _11_12_14, _21_22_24, _31_32_34 ),\n",
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"\tminor( _11_12_13, _21_22_23, _31_32_33 ));\n",
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"\t#undef minor\n",
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"\treturn transpose( cofactors ) / determinant( input );\n",
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"}\n"
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};
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private bool[] Inverse4x4FunctionFlags =
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{
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true,
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false,
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true,
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true,
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false,
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false,
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false,
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false,
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false,
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false,
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false,
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false,
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false,
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false,
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false,
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false,
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false,
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false,
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false,
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false,
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false,
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false,
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false,
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false,
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false,
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false,
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false
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};
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protected override void CommonInit( int uniqueId )
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{
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base.CommonInit( uniqueId );
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m_opName = "inverse";
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m_drawPreview = false;
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m_inputPorts[ 0 ].CreatePortRestrictions( WirePortDataType.FLOAT3x3,
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WirePortDataType.FLOAT4x4 );
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m_inputPorts[ 0 ].ChangeType( WirePortDataType.FLOAT4x4, false );
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m_outputPorts[ 0 ].ChangeType( WirePortDataType.FLOAT4x4, false );
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}
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public override string GenerateShaderForOutput( int outputId, ref MasterNodeDataCollector dataCollector, bool ignoreLocalvar )
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{
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if ( m_outputPorts[ 0 ].IsLocalValue( dataCollector.PortCategory ) )
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return m_outputPorts[ 0 ].LocalValue( dataCollector.PortCategory );
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string precisionString = UIUtils.PrecisionWirePortToCgType( m_currentPrecisionType, WirePortDataType.FLOAT );
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string value = m_inputPorts[ 0 ].GeneratePortInstructions( ref dataCollector );
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if ( m_outputPorts[ 0 ].DataType == WirePortDataType.FLOAT3x3 )
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{
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GeneratorUtils.Add3x3InverseFunction( ref dataCollector, precisionString );
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RegisterLocalVariable( 0, string.Format( GeneratorUtils.Inverse3x3Header, value ), ref dataCollector, "invertVal" + OutputId );
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}
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else
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{
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if ( !dataCollector.HasFunction( Inverse4x4Header ) )
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{
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//Hack to be used util indent is properly used
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int currIndent = UIUtils.ShaderIndentLevel;
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if ( dataCollector.IsTemplate )
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{
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UIUtils.ShaderIndentLevel = 0;
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}
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else
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{
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UIUtils.ShaderIndentLevel = 1;
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UIUtils.ShaderIndentLevel++;
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}
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string finalFunction = string.Empty;
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for ( int i = 0; i < Inverse4x4Function.Length; i++ )
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{
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finalFunction += UIUtils.ShaderIndentTabs + ( Inverse4x4FunctionFlags[ i ] ? string.Format( Inverse4x4Function[ i ], precisionString ) : Inverse4x4Function[ i ] );
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}
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UIUtils.ShaderIndentLevel = currIndent;
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dataCollector.AddFunction( Inverse4x4Header, finalFunction );
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}
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RegisterLocalVariable( 0, string.Format( Inverse4x4Header, value ), ref dataCollector, "invertVal" + OutputId );
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}
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return m_outputPorts[ 0 ].LocalValue( dataCollector.PortCategory );
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}
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}
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}
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