Salvage expeditions (#12745)

Content.Shared/Parallax/Biomes/Layers/BiomeDecalLayer.cs

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+using Content.Shared.Decals;
+using Content.Shared.Maps;
+using Robust.Shared.Noise;
+using Robust.Shared.Serialization;
+using Robust.Shared.Serialization.TypeSerializers.Implementations.Custom.Prototype.List;
+
+namespace Content.Shared.Parallax.Biomes.Layers;
+
+[Serializable, NetSerializable]
+public sealed class BiomeDecalLayer : IBiomeWorldLayer
+{
+    /// <inheritdoc/>
+    [DataField("allowedTiles", customTypeSerializer:typeof(PrototypeIdListSerializer<ContentTileDefinition>))]
+    public List<string> AllowedTiles { get; } = new();
+
+    /// <summary>
+    /// Divide each tile up by this amount.
+    /// </summary>
+    [DataField("divisions")]
+    public float Divisions = 1f;
+
+    [DataField("noise")]
+    public FastNoiseLite Noise { get; } = new(0);
+
+    /// <inheritdoc/>
+    [DataField("threshold")]
+    public float Threshold { get; } = 0.8f;
+
+    /// <inheritdoc/>
+    [DataField("invert")] public bool Invert { get; } = false;
+
+    [DataField("decals", required: true, customTypeSerializer:typeof(PrototypeIdListSerializer<DecalPrototype>))]
+    public List<string> Decals = new();
+}

Content.Shared/Parallax/Biomes/Layers/BiomeDummyLayer.cs

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+using Robust.Shared.Noise;
+using Robust.Shared.Serialization;
+
+namespace Content.Shared.Parallax.Biomes.Layers;
+
+/// <summary>
+/// Dummy layer that specifies a marker to be replaced by external code.
+/// For example if they wish to add their own layers at specific points across different templates.
+/// </summary>
+[Serializable, NetSerializable]
+public sealed class BiomeDummyLayer : IBiomeLayer
+{
+    [DataField("id", required: true)] public string ID = string.Empty;
+
+    public FastNoiseLite Noise { get; } = new();
+    public float Threshold { get; }
+    public bool Invert { get; }
+}

Content.Shared/Parallax/Biomes/Layers/BiomeEntityLayer.cs

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+using Content.Shared.Maps;
+using Robust.Shared.Noise;
+using Robust.Shared.Prototypes;
+using Robust.Shared.Serialization;
+using Robust.Shared.Serialization.TypeSerializers.Implementations.Custom.Prototype.List;
+
+namespace Content.Shared.Parallax.Biomes.Layers;
+
+[Serializable, NetSerializable]
+public sealed class BiomeEntityLayer : IBiomeWorldLayer
+{
+    /// <inheritdoc/>
+    [DataField("allowedTiles", customTypeSerializer:typeof(PrototypeIdListSerializer<ContentTileDefinition>))]
+    public List<string> AllowedTiles { get; } = new();
+
+    [DataField("noise")] public FastNoiseLite Noise { get; } = new(0);
+
+    /// <inheritdoc/>
+    [DataField("threshold")]
+    public float Threshold { get; } = 0.5f;
+
+    /// <inheritdoc/>
+    [DataField("invert")] public bool Invert { get; } = false;
+
+    [DataField("entities", required: true, customTypeSerializer: typeof(PrototypeIdListSerializer<EntityPrototype>))]
+    public List<string> Entities = new();
+}

Content.Shared/Parallax/Biomes/Layers/BiomeTileLayer.cs

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+using Content.Shared.Maps;
+using Robust.Shared.Noise;
+using Robust.Shared.Serialization;
+using Robust.Shared.Serialization.TypeSerializers.Implementations.Custom.Prototype;
+
+namespace Content.Shared.Parallax.Biomes.Layers;
+
+[Serializable, NetSerializable]
+public sealed class  BiomeTileLayer : IBiomeLayer
+{
+    [DataField("noise")] public FastNoiseLite Noise { get; } = new(0);
+
+    /// <inheritdoc/>
+    [DataField("threshold")]
+    public float Threshold { get; } = 0.5f;
+
+    /// <inheritdoc/>
+    [DataField("invert")] public bool Invert { get; } = false;
+
+    /// <summary>
+    /// Which tile variants to use for this layer. Uses all of the tile's variants if none specified
+    /// </summary>
+    [DataField("variants")]
+    public List<byte>? Variants = null;
+
+    [DataField("tile", required: true, customTypeSerializer: typeof(PrototypeIdSerializer<ContentTileDefinition>))]
+    public string Tile = string.Empty;
+}

Content.Shared/Parallax/Biomes/Layers/IBiomeLayer.cs

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+using Robust.Shared.Noise;
+
+namespace Content.Shared.Parallax.Biomes.Layers;
+
+[ImplicitDataDefinitionForInheritors]
+public interface IBiomeLayer
+{
+    /// <summary>
+    /// Seed is used an offset from the relevant BiomeComponent's seed.
+    /// </summary>
+    FastNoiseLite Noise { get; }
+
+    /// <summary>
+    /// Threshold for this layer to be present. If set to 0 forces it for every tile.
+    /// </summary>
+    float Threshold { get; }
+
+    /// <summary>
+    /// Is the thresold inverted so we need to be lower than it.
+    /// </summary>
+    public bool Invert { get; }
+}

Content.Shared/Parallax/Biomes/Layers/IBiomeWorldLayer.cs

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+namespace Content.Shared.Parallax.Biomes.Layers;
+
+/// <summary>
+/// Handles actual objects such as decals and entities.
+/// </summary>
+public interface IBiomeWorldLayer : IBiomeLayer
+{
+    /// <summary>
+    /// What tiles we're allowed to spawn on, real or biome.
+    /// </summary>
+    List<string> AllowedTiles { get; }
+}