e6d1546b44
GravityShaderMirrorTests compares the expression of GravityField.Potential with gravityPotential in Gravity.cginc. GravityFieldParityVerify now builds four off-axis bodies (one of mass 0), lowers through three frames with bodies moved between them, and checks the map screen's gravity camera mask. RTS/Planet.prefab loses the Gravity Well object bound to the Gravity Field material. Builds: yes (verify passes on Starfire; the new test is unrun until the Yggdrasil job). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
50 lines
2.4 KiB
C#
50 lines
2.4 KiB
C#
using System.IO;
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using System.Text.RegularExpressions;
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using Xunit;
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// potential-owns-gravity (aetheria-gravity, cut grid-lowering): Assets/Shaders/Gravity.cginc lowers the potential for
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// the GPU and decides nothing, so its gravityPotential must be GravityField.Potential, term for term, zero-strength
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// guard and core branch included. The shader cannot be compiled here (GravityFieldParityVerify renders it, on Starfire
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// only), so this test is the automated guard: each copy's expression is read from its file, reduced to the same
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// spelling (float suffixes, the core radius's name, whitespace and comments), and compared. A drift in either file fails it.
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public sealed class GravityShaderMirrorTests
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{
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private static string Read(string relative) =>
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File.ReadAllText(Path.Combine(RunStartTests.FindRepoRoot(), relative));
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// The text between `start` and the first `;` after it, comments removed and spellings reduced.
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private static string Expression(string source, string start, string then = "")
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{
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source = Regex.Replace(source, @"//[^\n]*", "");
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var from = source.IndexOf(start, System.StringComparison.Ordinal);
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Assert.True(from >= 0, $"'{start}' not found");
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var body = source.Substring(from + start.Length);
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if (then != "")
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{
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var at = body.IndexOf(then, System.StringComparison.Ordinal);
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Assert.True(at >= 0, $"'{then}' not found after '{start}'");
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body = body.Substring(at + then.Length);
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}
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body = body.Substring(0, body.IndexOf(';'));
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body = Regex.Replace(body, @"(?<=[\d.])f\b", "");
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body = body.Replace("coreRadius", "R");
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return Regex.Replace(body, @"\s+", "");
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}
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private static string CSharpLaw() =>
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Expression(Read("Assets/Scripts/ServerShared/GravityField.cs"), "Potential(float c, float coreRadius, float r) =>");
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private static string ShaderLaw() =>
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Expression(Read("Assets/Shaders/Gravity.cginc"), "float gravityPotential(float c, float R, float r)", "return");
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[Fact]
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public void TheShaderRunsTheSameLawAsGravityFieldPotential()
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{
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var law = CSharpLaw();
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// The reduction found the whole law, so equality is not two empty strings agreeing.
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Assert.Contains("log(r/R)", law);
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Assert.Contains("c==0?0:", law);
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Assert.Contains("c*r*r/(2*R*R)", law);
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Assert.Equal(law, ShaderLaw());
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}
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}
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