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101 行
3.2 KiB
101 行
3.2 KiB
using System;
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using System.Linq;
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using UnityEngine;
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namespace UnityEditor.Graphs.Material
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{
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[Title("Fractal/Perlin Node")]
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class PerlinNode : TextureNode, IGeneratesFunction, IGeneratesBodyCode
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{
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public override bool hasPreview { get { return true; } }
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[SerializeField]
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private int m_Iterations = 4;
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[SerializeField]
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private float m_Decay = 0.5f;
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[SerializeField]
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private float m_Frequency = 2.0f;
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public override void Init()
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{
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name = "Perlin";
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base.Init ();
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}
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public void GenerateNodeFunction(ShaderGenerator visitor, GenerationMode generationMode)
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{
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var outputString = new ShaderGenerator();
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foreach (var precision in m_PrecisionNames)
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{
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outputString.AddShaderChunk("inline " + precision + "4 unity_perlin_" + precision + " ("
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+ "sampler2D textureID, "
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+ "int iterations, "
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+ precision + " decay, "
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+ precision + " frequency, "
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+ precision + "2 p"
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+ ")", false);
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outputString.AddShaderChunk("{", false);
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outputString.Indent();
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outputString.AddShaderChunk(precision + "4 sum = " + precision + "4(0, 0, 0, 0);", false);
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outputString.AddShaderChunk(precision + " amp = 0.5;", false);
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outputString.AddShaderChunk("for(int n = 0; n < iterations; n++)", false);
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outputString.AddShaderChunk("{", false);
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outputString.Indent();
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outputString.AddShaderChunk("sum += amp * tex2D (textureID, p);", false);
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outputString.AddShaderChunk("p *= frequency;", false);
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outputString.AddShaderChunk("amp *= decay;", false);
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outputString.Deindent();
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outputString.AddShaderChunk("}", false);
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outputString.AddShaderChunk("return sum;", false);
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outputString.Deindent();
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outputString.AddShaderChunk("}", false);
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}
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visitor.AddShaderChunk(outputString.GetShaderString(0), true);
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}
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public override void GenerateNodeCode(ShaderGenerator visitor, GenerationMode generationMode)
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{
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var outputSlot = FindOutputSlot(kOutputSlotName);
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if (outputSlot == null)
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return;
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var uvSlot = FindInputSlot(kUVSlotName);
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if (uvSlot == null)
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return;
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var uvName = "IN.meshUV0";
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if (uvSlot.edges.Count > 0)
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{
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var fromNode = uvSlot.edges[0].fromSlot.node as BaseMaterialNode;
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uvName = fromNode.GetOutputVariableNameForSlot(uvSlot.edges[0].fromSlot, generationMode);
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}
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string body = "unity_perlin_" + precision + "(" + GetPropertyName () + ", " + m_Iterations + ", " + m_Decay + ", " + m_Frequency + ", " + uvName + ".xy)";
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visitor.AddShaderChunk("float4 " + GetOutputVariableNameForSlot(outputSlot, generationMode) + " = " + body + ";", true);
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}
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static float Slider(string title, float value, float from, float to)
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{
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GUILayout.BeginHorizontal();
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GUILayout.Label(title);
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value = GUILayout.HorizontalSlider(value, from, to, GUILayout.Width(64));
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GUILayout.EndHorizontal();
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return value;
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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_Iterations = (int)Slider("Iterations", (float)m_Iterations, 1, 8);
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m_Decay = Slider("Decay", m_Decay, -1f, 1f);
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m_Frequency = Slider("Frequency", m_Frequency, 0f, 5f);
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if (EditorGUI.EndChangeCheck())
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RegeneratePreviewShaders();
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}
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}
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}
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