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48 行
1.9 KiB
48 行
1.9 KiB
using UnityEngine.Graphing;
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namespace UnityEngine.MaterialGraph
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{
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[Title ("Math/Color/RGBtoHSV")]
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public class RGBtoHSVNode : Function1Input, IGeneratesFunction
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{
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public RGBtoHSVNode ()
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{
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name = "RGBtoHSV";
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}
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protected override string GetFunctionName ()
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{
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return "unity_rgbtohsv_" + precision;
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}
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protected override MaterialSlot GetInputSlot ()
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{
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return new MaterialSlot (InputSlotId, GetInputSlotName (), kInputSlotShaderName, SlotType.Input, SlotValueType.Vector3, Vector4.zero);
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}
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protected override MaterialSlot GetOutputSlot ()
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{
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return new MaterialSlot (OutputSlotId, GetOutputSlotName (), kOutputSlotShaderName, SlotType.Output, SlotValueType.Vector3, Vector4.zero);
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}
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//TODO:Externalize
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//Reference code from:http://www.chilliant.com/rgb2hsv.html
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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 ("arg1"), false);
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outputString.AddShaderChunk ("{", false);
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outputString.Indent ();
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outputString.AddShaderChunk (precision + "4 K = " + precision + "4(0.0, -1.0 / 3.0, 2.0 / 3.0, -1.0);", false);
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outputString.AddShaderChunk (precision + "4 P = lerp(" + precision + "4(arg1.bg, K.wz), " + precision + "4(arg1.gb, K.xy), step(arg1.b, arg1.g));", false);
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outputString.AddShaderChunk (precision + "4 Q = lerp(" + precision + "4(P.xyw, arg1.r), " + precision + "4(arg1.r, P.yzx), step(P.x, arg1.r));", false);
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outputString.AddShaderChunk (precision + " D = Q.x - min(Q.w, Q.y);", false);
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outputString.AddShaderChunk (precision + " E = 1e-10;", false);
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outputString.AddShaderChunk ("return " + precision + "3(abs(Q.z + (Q.w - Q.y)/(6.0 * D + E)), D / (Q.x + E), Q.x);", false);
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outputString.Deindent ();
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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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