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LightlessSync/Services/TextureCompression/TextureCompressionCapabilities.cs

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+using System.Collections.Generic;
+using System.Collections.Immutable;
+using System.IO;
+using System.Linq;
+using Penumbra.Api.Enums;
+
+namespace LightlessSync.Services.TextureCompression;
+
+internal static class TextureCompressionCapabilities
+{
+    private static readonly ImmutableDictionary<TextureCompressionTarget, TextureType> TexTargets =
+        new Dictionary<TextureCompressionTarget, TextureType>
+        {
+            [TextureCompressionTarget.BC7] = TextureType.Bc7Tex,
+            [TextureCompressionTarget.BC3] = TextureType.Bc3Tex,
+        }.ToImmutableDictionary();
+
+    private static readonly ImmutableDictionary<TextureCompressionTarget, TextureType> DdsTargets =
+        new Dictionary<TextureCompressionTarget, TextureType>
+        {
+            [TextureCompressionTarget.BC7] = TextureType.Bc7Dds,
+            [TextureCompressionTarget.BC3] = TextureType.Bc3Dds,
+        }.ToImmutableDictionary();
+
+    private static readonly TextureCompressionTarget[] SelectableTargetsCache = TexTargets
+        .Select(kvp => kvp.Key)
+        .OrderBy(t => t)
+        .ToArray();
+
+    private static readonly HashSet<TextureCompressionTarget> SelectableTargetSet = SelectableTargetsCache.ToHashSet();
+
+    public static IReadOnlyList<TextureCompressionTarget> SelectableTargets => SelectableTargetsCache;
+
+    public static TextureCompressionTarget DefaultTarget => TextureCompressionTarget.BC7;
+
+    public static bool IsSelectable(TextureCompressionTarget target) => SelectableTargetSet.Contains(target);
+
+    public static TextureCompressionTarget Normalize(TextureCompressionTarget? desired)
+    {
+        if (desired.HasValue && IsSelectable(desired.Value))
+        {
+            return desired.Value;
+        }
+
+        return DefaultTarget;
+    }
+
+    public static bool TryGetPenumbraTarget(TextureCompressionTarget target, string? outputPath, out TextureType textureType)
+    {
+        if (!string.IsNullOrWhiteSpace(outputPath) &&
+            string.Equals(Path.GetExtension(outputPath), ".dds", StringComparison.OrdinalIgnoreCase))
+        {
+            return DdsTargets.TryGetValue(target, out textureType);
+        }
+
+        return TexTargets.TryGetValue(target, out textureType);
+    }
+}