wehub-resource-sync
68 lines
2.6 KiB
C#
68 lines
2.6 KiB
C#
using T3.Core.DataTypes.ShaderGraph;
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namespace Lib.field.generate.sdf;
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[Guid("fdb85ece-201b-49dc-899b-f044a98ac414")]
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internal sealed class OctahedronSDF : Instance<OctahedronSDF>
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, ITransformable
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, IGraphNodeOp
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{
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[Output(Guid = "1cda6720-72cb-4aeb-a665-2fc35d787539")]
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public readonly Slot<ShaderGraphNode> Result = new();
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IInputSlot ITransformable.TranslationInput => Center;
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IInputSlot ITransformable.RotationInput => null;
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IInputSlot ITransformable.ScaleInput => null;
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public Action<Instance, EvaluationContext> TransformCallback { get; set; }
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public OctahedronSDF()
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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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TransformCallback?.Invoke(this, context); //needed for Gizmo
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ShaderNode.Update(context);
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}
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public ShaderGraphNode ShaderNode { get; }
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//Octahedron SDF by TheTurk (check comments): https://www.shadertoy.com/view/wsSGDG
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void IGraphNodeOp.AddDefinitions(CodeAssembleContext c)
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{
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c.Globals["fsdOctahedron"] = """
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float fsdOctahedron(float3 p, float3 center, float s, float ra) {
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p -= center;
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p = abs(p);
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float m = (p.x + p.y + p.z - s) / 3.0;
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float3 o = p - m;
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float3 k = min(o, 0.0);
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o = o + (k.x + k.y + k.z) * 0.5 - k * 1.5;
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o = clamp(o, 0.0, s);
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return length(p - o) * sign(m) - ra;
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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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c.AppendCall($"f{c}.w = fsdOctahedron(p{c}.xyz, {ShaderNode}Center, {ShaderNode}Size, {ShaderNode}EdgeRadius);");
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c.AppendCall($"f{c}.xyz = p.w < 0.5 ? p{c}.xyz : 1;");
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}
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[GraphParam]
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[Input(Guid = "2811b696-3d09-46f7-84ac-045eb7fe82b0")]
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public readonly InputSlot<Vector3> Center = new();
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[GraphParam]
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[Input(Guid = "23012866-4820-4072-8cd8-82d6bdedf13d")]
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public readonly InputSlot<float> Size = new();
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[GraphParam]
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[Input(Guid = "921ec8f2-cd50-459b-8f0a-990de5deea64")]
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public readonly InputSlot<float> EdgeRadius = new();
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} |