check palette references

OpenRA.Game/Traits/LintAttributes.cs

@@ -43,4 +43,11 @@ namespace OpenRA.Traits
 
 	[AttributeUsage(AttributeTargets.Field)]
 	public sealed class UpgradeUsedReferenceAttribute : Attribute { }
+
+	[AttributeUsage(AttributeTargets.Field)]
+	public sealed class PaletteDefinitionAttribute : Attribute { }
+
+	// TODO: differentiate player palettes
+	[AttributeUsage(AttributeTargets.Field)]
+	public sealed class PaletteReferenceAttribute : Attribute { }
 }

OpenRA.Game/Traits/Player/FixedColorPalette.cs

@@ -16,15 +16,20 @@ namespace OpenRA.Traits
 	public class FixedColorPaletteInfo : ITraitInfo
 	{
 		[Desc("The name of the palette to base off.")]
-		public readonly string Base = "terrain";
+		[PaletteReference] public readonly string Base = "terrain";
+
 		[Desc("The name of the resulting palette")]
-		public readonly string Name = "resources";
+		[PaletteDefinition] public readonly string Name = "resources";
+
 		[Desc("Remap these indices to pre-defined colors.")]
 		public readonly int[] RemapIndex = { };
+
 		[Desc("The fixed color to remap.")]
 		public readonly HSLColor Color;
+
 		[Desc("Luminosity range to span.")]
 		public readonly float Ramp = 0.05f;
+
 		[Desc("Allow palette modifiers to change the palette.")]
 		public readonly bool AllowModifiers = true;
 

OpenRA.Game/Traits/Player/PlayerColorPalette.cs

@@ -17,13 +17,17 @@ namespace OpenRA.Traits
 	public class PlayerColorPaletteInfo : ITraitInfo
 	{
 		[Desc("The name of the palette to base off.")]
-		public readonly string BasePalette = null;
+		[PaletteReference] public readonly string BasePalette = null;
+
 		[Desc("The prefix for the resulting player palettes")]
 		public readonly string BaseName = "player";
+
 		[Desc("Remap these indices to player colors.")]
 		public readonly int[] RemapIndex = { };
+
 		[Desc("Luminosity range to span.")]
 		public readonly float Ramp = 0.05f;
+
 		[Desc("Allow palette modifiers to change the palette.")]
 		public readonly bool AllowModifiers = true;
 

OpenRA.Game/Traits/World/ResourceType.cs

@@ -17,7 +17,7 @@ namespace OpenRA.Traits
 	{
 		public readonly string Sequence = "resources";
 		[SequenceReference("Sequence")] public readonly string[] Variants = { };
-		public readonly string Palette = "terrain";
+		[PaletteReference] public readonly string Palette = "terrain";
 		public readonly int ResourceType = 1;
 
 		public readonly int ValuePerUnit = 0;