wehub-resource-sync
104 lines
3.8 KiB
C#
104 lines
3.8 KiB
C#
using T3.Core.DataTypes.ShaderGraph;
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using T3.Core.Utils;
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namespace Lib.field.generate.sdf;
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[Guid("933aec2c-e7dd-44b4-a094-14d0195f9f7a")]
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internal sealed class FractalSDF : Instance<FractalSDF>
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, IGraphNodeOp
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{
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[Output(Guid = "095c8c2a-4d5a-4aac-8ff9-b696ed14406d")]
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public readonly Slot<ShaderGraphNode> Result = new();
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public FractalSDF()
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{
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ShaderNode = new ShaderGraphNode(this);
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Result.Value = ShaderNode;
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Result.UpdateAction += Update;
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}
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private void Update(EvaluationContext context)
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{
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var iterations = Iterations.GetValue(context).Clamp(1, 20);
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if (iterations != _iterations)
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{
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_iterations = iterations;
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ShaderNode.FlagCodeChanged();
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}
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ShaderNode.Update(context);
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}
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public ShaderGraphNode ShaderNode { get; }
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public void AddDefinitions(CodeAssembleContext c)
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{
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c.Globals["MandelBulbFractal"]
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= """
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float fMandelBulbFractal(float3 pos, float scale1, float3 clamping, float3 increment, float minrad, float2 fold, int iterations)
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{
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float4 pN = float4(pos, 1);
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// return dStillLogo(pN);
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// precomputed constants
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float minRad2 = clamp(minrad, 1.0e-9, 1.0);
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float4 scale = float4(scale1.xxx, abs(scale1)) / minRad2;
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float absScalem1 = abs(scale1 - 1.0);
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float AbsScaleRaisedTo1mIters = pow(abs(scale1), float(1 - iterations));
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//float DIST_MULTIPLIER = StepSize;
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float4 p = float4(pos, 1);
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float4 p0 = p; // p.w is the distance estimate
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for (int i = 0; i < iterations; i++)
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{
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// box folding:
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p.xyz = abs(1 + p.xyz) - p.xyz - abs(1.0 - p.xyz); // add;add;abs.add;abs.add (130.4%)
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p.xyz = clamp(p.xyz, clamping.x, clamping.y) * clamping.z - p.xyz; // min;max;mad
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// sphere folding: if (r2 < minRad2) p /= minRad2; else if (r2 < 1.0) p /= r2;
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float r2 = dot(p.xyz, p.xyz);
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p *= clamp(max(minRad2 / r2, minRad2), fold.x, fold.y); // dp3,div,max.sat,mul
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p.xyz += float3(increment.x, increment.y, increment.z);
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// scale, translate
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p = p * scale + p0;
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}
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float d = ((length(p.xyz) - absScalem1) / p.w - AbsScaleRaisedTo1mIters);
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return d;
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}
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""";
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}
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public void GetPreShaderCode(CodeAssembleContext c, int inputIndex)
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{
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var n = ShaderNode;
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c.AppendCall($"f{c}.w = fMandelBulbFractal(p{c}.xyz, {n}Scale, {n}Clamping, {n}Increment, {n}Minrad, {n}Fold, clamp({n}Iterations,1,20));");
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c.AppendCall($"f{c}.xyz = p.w < 0.5 ? p{c}.xyz : 1;"); // save local space
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}
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private int _iterations = 5;
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[GraphParam]
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[Input(Guid = "5678312C-5C31-4B7E-9E82-4595AA8A6740")]
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public readonly InputSlot<float> Scale = new();
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[GraphParam]
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[Input(Guid = "AB32B4F6-DEA8-4E25-B5CD-2E232273A51E")]
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public readonly InputSlot<float> Minrad = new();
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[GraphParam]
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[Input(Guid = "482FF1B2-2383-45DB-8A5A-30EF2A07C8FB")]
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public readonly InputSlot<Vector3> Clamping = new();
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[GraphParam]
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[Input(Guid = "CEF65141-085C-4E09-8F16-8338B0964BC4")]
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public readonly InputSlot<Vector3> Increment = new();
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[GraphParam]
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[Input(Guid = "5DC2517B-228C-45A7-ABE5-B87275EB5224")]
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public readonly InputSlot<Vector2> Fold = new();
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[GraphParam]
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[Input(Guid = "094637CF-9526-49D5-BB9F-19991CDCC516")]
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public readonly InputSlot<int> Iterations = new();
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} |