05749f52e0
Ports the decompiled AC client ground-truth oracle and exhaustive conformance test suite from WorldBuilder-ACME-Edition into acdream's test project. ClientReference.cs: faithful C# port of CLandBlockStruct.cpp with IsSWtoNECut, GetPalCode, GetVertexHeight, GetVertexPosition. ClientConformanceTests.cs verifies acdream's implementations match: - SplitDirection: 9 spot-checks + 25,600-cell full sweep (0 mismatches) - PalCode: 5 spot-checks + 256 exhaustive roads + 1M exhaustive types - Height sampling: flat terrain exact match, vertex corners match, interpolated points in-range - TerrainSurface.SampleZ agrees with TerrainBlending split direction - Constants match (CellSize=24, CellsPerBlock=8, BlockLength=192) 27 new tests. 310 total (201 core + 109 net), all green. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
75 lines
2.6 KiB
C#
75 lines
2.6 KiB
C#
using System.Numerics;
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using System.Runtime.CompilerServices;
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namespace AcDream.Core.Tests.Terrain;
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/// <summary>
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/// Faithful C# port of the original AC client terrain algorithms,
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/// translated from decompiled C++ in acclient-source-split/CLandBlockStruct.cpp.
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/// Serves as the ground-truth oracle for conformance testing.
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///
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/// Ported from WorldBuilder-ACME-Edition/WorldBuilder.Tests/ClientReference.cs.
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/// All formulas use signed int arithmetic with unchecked wrapping to match x86 behavior.
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/// </summary>
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public static class ClientReference
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{
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/// <summary>
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/// Port of CLandBlockStruct::ConstructPolygons at offset 0x00531D10.
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/// Returns true when the triangle split goes from SW to NE (SWtoNEcut=1).
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/// </summary>
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static bool IsSWtoNECut(int globalCellX, int globalCellY)
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{
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unchecked
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{
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int v7 = globalCellY * (214614067 * globalCellX + 1813693831)
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- 1109124029 * globalCellX - 1369149221;
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return (double)(uint)v7 * 2.3283064e-10 >= 0.5;
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}
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}
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/// <summary>
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/// Port of pal_code[0] from CLandBlockStruct::GetCellRotation at offset 0x00532170.
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/// Corner order: 0=(ix,iy), 1=(ix+1,iy), 2=(ix+1,iy+1), 3=(ix,iy+1)
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/// </summary>
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public static uint GetPalCode(
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int r0, int t0,
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int r1, int t1,
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int r2, int t2,
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int r3, int t3,
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int texSize = 1)
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{
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unchecked
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{
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return (uint)(t3
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+ (texSize << 28)
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+ 32 * (t2 + 32 * (t1 + 32 * (t0 + 32 * (r3 + 4 * (r2 + 4 * (r1 + 4 * r0)))))));
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}
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}
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/// <summary>
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/// Port of CLandBlockStruct::ConstructVertices at offset 0x005328D0.
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/// Height = LandDefs::Land_Height_Table[height_byte]
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/// </summary>
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static float GetVertexHeight(float[] landHeightTable, byte heightByte)
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{
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return landHeightTable[heightByte];
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}
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/// <summary>
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/// Port of CLandBlockStruct::ConstructVertices vertex position.
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/// Each vertex is at (ix * polySize, iy * polySize, height).
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/// </summary>
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public static Vector3 GetVertexPosition(float[] landHeightTable, byte heightByte, int ix, int iy, float polySize = 24f)
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{
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return new Vector3(ix * polySize, iy * polySize, landHeightTable[heightByte]);
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}
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public const int MapWidth = 255;
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public const int MapHeight = 255;
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public const float CellSize = 24.0f;
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public const int CellsPerBlock = 8;
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public const float RoadWidth = 5.0f;
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public const float BlockLength = 192.0f;
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}
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