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67 行
2.0 KiB
67 行
2.0 KiB
using UnityEngine;
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namespace UnityEditor.Graphs.Material
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{
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[Title("Art/Blend Node")]
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class BlendNode : Function2Input, IGeneratesFunction
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{
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public override void Init()
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{
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name = "BlendNode";
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base.Init();
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}
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public enum Operation {
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Normal,
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Additive,
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}
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[SerializeField]
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private Operation m_Operation;
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[SerializeField]
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private float m_Blend = 0.5f;
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private static readonly string[] kOpNames = new[]
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{
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"normal",
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"add"
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};
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protected override string GetFunctionName() { return "unity_blend_"+ kOpNames[(int)m_Operation] +"_"+precision; }
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protected override string GetFunctionCallBody (string input1Value, string input2Value)
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{
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return GetFunctionName() + "("+input1Value+", "+input2Value+", "+m_Blend+")";
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}
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protected void AddOperationBody (ShaderGenerator visitor, string name, string body, string precision)
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{
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var outputString = new ShaderGenerator ();
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outputString.AddShaderChunk("inline "+precision+"4 unity_blend_"+name+"_"+precision+" ("+precision+"4 arg1, "+precision+"4 arg2, "+precision+" blend)", false);
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outputString.AddShaderChunk("{", false); outputString.Indent();
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outputString.AddShaderChunk(body, false);
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outputString.Deindent(); outputString.AddShaderChunk("}", false);
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visitor.AddShaderChunk (outputString.GetShaderString (0), true);
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}
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public override void NodeUI (Graphs.GraphGUI host)
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{
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base.NodeUI(host);
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EditorGUI.BeginChangeCheck ();
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m_Blend = GUILayout.HorizontalSlider(m_Blend, 0f, 1f, GUILayout.Width(64));
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m_Operation = (Operation)EditorGUILayout.EnumPopup (m_Operation);
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if (EditorGUI.EndChangeCheck ())
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RegeneratePreviewShaders ();
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}
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public void GenerateNodeFunction(ShaderGenerator visitor, GenerationMode generationMode)
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{
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foreach (var precision in m_PrecisionNames)
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{
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AddOperationBody (visitor, kOpNames[(int)Operation.Normal], "return lerp(arg1, arg2, blend);", precision);
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AddOperationBody (visitor, kOpNames[(int)Operation.Additive], "return (arg1 + arg2) * blend;", precision);
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}
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}
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}
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}
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