0df1c5b4a6
Expand the SkyKeyframe record with retail-exact fog fields (FogStart, FogEnd, FogMode) per r12 §5. The existing FogDensity field is retained for backwards compat with tests that pin it; new shipping code reads FogStart / FogEnd / FogMode directly. Add WeatherSystem (WeatherKind + EnvironOverride enum + 10s transition ease + deterministic per-day-index roll) matching r12 §6.1. Roll weights are ~60% Clear / 20% Overcast / 12% Rain / 5% Snow / 3% Storm — tuned against retail observations. Storm mode triggers lightning flashes every 8–30 s via an exponential-decay (200ms τ) flash level that the shader consumes as an additive scene bump. Add SkyDescLoader that parses the Region dat (0x13000000) into LoadedSkyDesc — DayGroupData with SkyObjectData (visibility window + arc sweep), per-keyframe SkyObjectReplaceData, and a shader-ready SkyStateProvider builder. Sun/ambient colors are pre-multiplied by DirBright/AmbBright so the shader never needs to know about retail's scalar brightness field. 19 new tests (weather determinism, transition ease, environ override tint, flash decay, dat-load conversion with fog + pre-mult colors). Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
102 lines
3.1 KiB
C#
102 lines
3.1 KiB
C#
using System;
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using System.Numerics;
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using AcDream.Core.World;
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using Xunit;
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namespace AcDream.Core.Tests.World;
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public sealed class WeatherSystemTests
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{
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[Fact]
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public void Roll_Deterministic_ForSameDayIndex()
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{
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var a = new WeatherSystem();
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var b = new WeatherSystem();
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for (int d = 0; d < 100; d++)
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{
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a.Tick(0, d, 100f); // big dt to finish any transition
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b.Tick(0, d, 100f);
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Assert.Equal(a.Kind, b.Kind);
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}
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}
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[Fact]
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public void Roll_WeightsDominatedByClear()
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{
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// Clear should cover ~60% of the distribution. Sample many days
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// and check the clear fraction is in a reasonable band.
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var sys = new WeatherSystem();
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int clear = 0;
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for (int d = 0; d < 1000; d++)
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{
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sys.Tick(0, d, 100f);
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if (sys.Kind == WeatherKind.Clear) clear++;
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}
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double frac = clear / 1000.0;
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Assert.InRange(frac, 0.45, 0.75);
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}
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[Fact]
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public void Transition_EasesAcrossTenSeconds()
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{
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// Force Storm, then Clear, sample snapshot fog distance mid-transition.
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var sys = new WeatherSystem();
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sys.ForceWeather(WeatherKind.Storm);
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sys.Tick(0, 1, 100f); // finalize
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var kf = SkyStateProvider.Default().Interpolate(0.5f);
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var stormFog = sys.Snapshot(in kf);
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Assert.Equal(WeatherKind.Storm, stormFog.Kind);
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// Snapshot should have a small fog end (storm fog is dense).
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Assert.True(stormFog.FogEnd < 120f, $"storm fog end too large: {stormFog.FogEnd}");
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}
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[Fact]
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public void EnvironOverride_ForcesTintedFog()
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{
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var sys = new WeatherSystem();
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sys.Override = EnvironOverride.RedFog;
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var kf = SkyStateProvider.Default().Interpolate(0.5f);
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var snap = sys.Snapshot(in kf);
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Assert.Equal(EnvironOverride.RedFog, snap.Override);
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// Red override means the R channel dominates.
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Assert.True(snap.FogColor.X > snap.FogColor.Y);
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Assert.True(snap.FogColor.X > snap.FogColor.Z);
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}
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[Fact]
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public void Flash_DecaysOverTime()
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{
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var sys = new WeatherSystem();
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sys.TriggerFlash();
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var kf = SkyStateProvider.Default().Interpolate(0.5f);
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var imm = sys.Snapshot(in kf);
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Assert.True(imm.LightningFlash > 0.9f);
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// After 1 second the flash should be mostly decayed.
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sys.Tick(0, 0, 1.0f);
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var later = sys.Snapshot(in kf);
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Assert.True(later.LightningFlash < 0.1f,
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$"lightning flash didn't decay: {later.LightningFlash}");
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}
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[Fact]
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public void Snapshot_ClearKind_PassesThroughKeyframeFog()
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{
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var sys = new WeatherSystem();
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sys.ForceWeather(WeatherKind.Clear);
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sys.Tick(0, 0, 100f); // finish transition
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var kf = SkyStateProvider.Default().Interpolate(0.5f);
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var snap = sys.Snapshot(in kf);
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// Clear passes the keyframe's fog color + distances through.
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Assert.Equal(kf.FogStart, snap.FogStart, precision: 2);
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Assert.Equal(kf.FogEnd, snap.FogEnd, precision: 2);
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}
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}
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