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32 lines
866 B
32 lines
866 B
3 weeks ago
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using System.Runtime.CompilerServices;
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using System.Runtime.InteropServices;
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[Tool]
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[GlobalClass]
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public partial class TerrainChunk
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: Resource
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{
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// ChunkShift of 5 results in a ChunkSize of 32.
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public const int Shift = 5;
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public const int Mask = ~(~0 << Shift);
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public const int Size = Mask + 1;
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static readonly int SizeInBytes = Size * Size * Unsafe.SizeOf<Tile>();
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[Export] public byte[] Data { get; set; } = new byte[SizeInBytes];
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public ref Tile this[TilePos pos] { get {
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var tiles = MemoryMarshal.Cast<byte, Tile>(Data);
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return ref tiles[GetIndex(pos)];
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} }
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public static Vector2I ToChunkPos(TilePos pos)
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=> new(pos.X >> Shift, pos.Z >> Shift);
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public static Vector2I ToTileOffset(Vector2I chunkPos)
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=> new(chunkPos.X << Shift, chunkPos.Y << Shift);
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static int GetIndex(TilePos pos)
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=> (pos.X & Mask) | ((pos.Z & Mask) << Shift);
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}
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