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63 行
2.7 KiB
63 行
2.7 KiB
using UnityEngine.Graphing;
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using System.Linq;
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using System.Collections;
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namespace UnityEngine.MaterialGraph
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{
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[Title("HeightToNormal")]
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public class HeightToNormalNode : FunctionNInNOut, IGeneratesFunction
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{
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public HeightToNormalNode()
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{
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name = "HeightToNormal";
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AddSlot("HeightMap", "heightmap", Graphing.SlotType.Input, SlotValueType.sampler2D, Vector4.zero);
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AddSlot("UV", "texCoord", Graphing.SlotType.Input, SlotValueType.Vector2, Vector4.zero);
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AddSlot("Offset", "texOffset", Graphing.SlotType.Input, SlotValueType.Vector1, new Vector4(0.005f, 0,0,0));
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AddSlot("Strength", "strength", Graphing.SlotType.Input, SlotValueType.Vector1, new Vector4(8,0,0,0));
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AddSlot("Normal", "normalRes", Graphing.SlotType.Output, SlotValueType.Vector3, Vector4.zero);
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UpdateNodeAfterDeserialization();
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}
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protected override string GetFunctionName()
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{
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return "unity_HeightToNormal";
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}
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public override bool hasPreview
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{
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get { return true; }
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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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outputString.AddShaderChunk(GetFunctionPrototype(), false);
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outputString.AddShaderChunk("{", false);
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outputString.AddShaderChunk("float2 offsetU = float2(texCoord.x + texOffset, texCoord.y);", false);
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outputString.AddShaderChunk("float2 offsetV = float2(texCoord.x, texCoord.y + texOffset);", false);
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outputString.AddShaderChunk("float normalSample = tex2D(heightmap, texCoord).r;", false);
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outputString.AddShaderChunk("float uSample = tex2D(heightmap, offsetU).r;", false);
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outputString.AddShaderChunk("float vSample = tex2D(heightmap, offsetV).r;", false);
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outputString.AddShaderChunk("float uMinusNormal = uSample - normalSample;", false);
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outputString.AddShaderChunk("float vMinusNormal = vSample - normalSample;", false);
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outputString.AddShaderChunk("uMinusNormal = uMinusNormal * strength;", false);
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outputString.AddShaderChunk("vMinusNormal = vMinusNormal * strength;", false);
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outputString.AddShaderChunk("float3 va = float3(1, 0, uMinusNormal);", false);
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outputString.AddShaderChunk("float3 vb = float3(0, 1, vMinusNormal);", false);
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outputString.AddShaderChunk("normalRes = cross(va, vb);", false);
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outputString.AddShaderChunk("}", false);
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visitor.AddShaderChunk(outputString.GetShaderString(0), true);
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}
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}
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}
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