9b1b27d2d6
Commit13c7a087and the mergea1b54beado not build: error CS8773, raw string literals need C# 11. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
63 lines
2.5 KiB
C#
63 lines
2.5 KiB
C#
using System.Globalization;
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/// <summary>
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/// The single author of Assets/Shaders/Gravity.cginc, the GPU lowering of the zone's potential. The law is
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/// GravityField's (its constants are read here, not respelled) and the height is Zone.GetHeight: each well's
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/// potential minus its reference, summed, divided by the exaggeration. Unity does not run C# when it imports a
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/// shader, so the committed cginc is this output; GravityShaderTests fails unless it equals Source() exactly.
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/// To change the shader, change this file and regenerate: AETHERIA_REGENERATE_GRAVITY_CGINC=1 dotnet test --filter GravityShaderTests.
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/// </summary>
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public static class GravityShader
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{
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public const string Path = "Assets/Shaders/Gravity.cginc";
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/// <summary>The whole file, with LF line ends.</summary>
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public static string Source() => (Template
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.Replace("@TAIL@", GravityField.TailOffset.ToString("R", CultureInfo.InvariantCulture)))
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.Replace("\r\n", "\n");
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private const string Template = @"#ifndef AETHERIA_GRAVITY_INCLUDED
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#define AETHERIA_GRAVITY_INCLUDED
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// GENERATED by ServerShared/GravityShader.cs from GravityField; do not edit (GravityShaderTests fails on any difference).
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// The lowering of the zone's potential (aetheria-gravity, cut grid-lowering). The law is ServerShared's GravityField
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// and the height is Zone.GetHeight; this file decides nothing. GravityLowering.Lower fills the buffer and the globals
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// from the zone (positions from Orbit.Position, reference from Zone.WellReference) each frame.
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// GravityFieldParityVerify renders it and compares every texel with -Zone.GetHeight.
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struct GravityWell
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{
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float2 position;
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float strength;
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float coreRadius;
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float reference;
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};
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StructuredBuffer<GravityWell> _GravityWells;
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int _GravityWellCount;
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float _HeightExaggeration;
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// GravityField.Potential: c is the well's strength, R its core radius, r the distance.
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float gravityPotential(float c, float R, float r)
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{
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return c == 0 ? 0 :
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r < R
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? c * r * r / (2 * R * R)
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: c * (log(r / R) + @TAIL@);
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}
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// Zone.GetHeight at world xz: each well's potential minus its own reference, summed, divided by the exaggeration.
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float gravityHeight(float2 p)
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{
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float result = 0;
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for (int i = 0; i < _GravityWellCount; i++)
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{
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GravityWell well = _GravityWells[i];
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result += gravityPotential(well.strength, well.coreRadius, length(p - well.position)) - well.reference;
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}
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return result / _HeightExaggeration;
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}
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#endif
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";
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}
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