Add PreferUnsigned option for TransformEnums.CoerceBackingTypes and use it for the Vulkan bindings

Author: Exanite

.silktouch/82fde6eb3b68e085.stout

@@ -342,7 +342,7 @@
             "MemberValue": "0x7FFFFFFF"
           }
         ],
-        "CoerceBackingTypes": "PreferSigned",
+        "CoerceBackingTypes": "PreferUnsigned",
         "RewriteMemberValues": true
       },
       "AddVTables": {

generator.json

@@ -32,6 +32,15 @@ public enum EnumBackingTypePreference
         /// match the backing types of enums generated on Windows.
         /// </remarks>
         PreferSigned,
+
+        /// <summary>
+        /// Replace unsigned backing types with signed backing types.
+        /// </summary>
+        /// <remarks>
+        /// This can be used to ensure that the backing types of enums generated on Windows
+        /// match the backing types of enums generated on Unix.
+        /// </remarks>
+        PreferUnsigned,
     }
 
     /// <summary>
@@ -317,6 +326,47 @@ private class Rewriter(Configuration config, List<EnumMemberFilter> removeMember
 
                     break;
                 }
+
+                case EnumBackingTypePreference.PreferUnsigned:
+                {
+                    var baseList = originalNode.BaseList;
+                    if (baseList == null)
+                    {
+                        break;
+                    }
+
+                    var baseTypes = baseList.Types
+                        .Select<BaseTypeSyntax, BaseTypeSyntax?>(t =>
+                        {
+                            var type = semanticModel.GetTypeInfo(t.Type).Type;
+
+                            if (SymbolEqualityComparer.Default.Equals(type, compilation.GetSpecialType(SpecialType.System_Int32)))
+                            {
+                                return SimpleBaseType(PredefinedType(Token(SyntaxKind.UIntKeyword)));
+                            }
+
+                            if (SymbolEqualityComparer.Default.Equals(type, compilation.GetSpecialType(SpecialType.System_Int64)))
+                            {
+                                return SimpleBaseType(PredefinedType(Token(SyntaxKind.ULongKeyword)));
+                            }
+
+                            return t;
+                        })
+                        .Where(x => x is not null)
+                        .Cast<BaseTypeSyntax>()
+                        .ToList();
+
+                    if (baseTypes.Count == 0)
+                    {
+                        node = node.WithBaseList(BaseList([SimpleBaseType(PredefinedType(Token(SyntaxKind.UIntKeyword)))]));
+                    }
+                    else
+                    {
+                        node = node.WithBaseList(BaseList([..baseTypes]));
+                    }
+
+                    break;
+                }
             }
 
             node = node.WithMembers([..members]);

sources/SilkTouch/SilkTouch/Mods/TransformEnums.cs

@@ -10,7 +10,7 @@ namespace Silk.NET.Vulkan;
 
 [Transformed]
 [Flags]
-public enum AccessFlags2 : long
+public enum AccessFlags2 : ulong
 {
     None = 0x0,
     IndirectCommandReadBit = 0x1,

sources/Vulkan/Vulkan/Enums/AccessFlags2.gen.cs

@@ -10,7 +10,7 @@ namespace Silk.NET.Vulkan;
 
 [Transformed]
 [Flags]
-public enum AccessFlags3KHR : long
+public enum AccessFlags3KHR : ulong
 {
     Access3NoneKHR = 0x0,
 }

sources/Vulkan/Vulkan/Enums/AccessFlags3KHR.gen.cs

@@ -10,7 +10,7 @@ namespace Silk.NET.Vulkan;
 
 [Transformed]
 [Flags]
-public enum BufferUsageFlags2 : long
+public enum BufferUsageFlags2 : ulong
 {
     None = 0x0,
     TransferSrcBit = 0x1,

sources/Vulkan/Vulkan/Enums/BufferUsageFlags2.gen.cs

@@ -10,7 +10,7 @@ namespace Silk.NET.Vulkan;
 
 [Transformed]
 [Flags]
-public enum DataGraphPipelineDispatchFlagsARM : long
+public enum DataGraphPipelineDispatchFlagsARM : ulong
 {
     None = 0x0,
 }

sources/Vulkan/Vulkan/Enums/DataGraphPipelineDispatchFlagsARM.gen.cs

@@ -10,7 +10,7 @@ namespace Silk.NET.Vulkan;
 
 [Transformed]
 [Flags]
-public enum DataGraphPipelineSessionCreateFlagsARM : long
+public enum DataGraphPipelineSessionCreateFlagsARM : ulong
 {
     None = 0x0,
     ProtectedBitARM = 0x1,

sources/Vulkan/Vulkan/Enums/DataGraphPipelineSessionCreateFlagsARM.gen.cs

@@ -10,7 +10,7 @@ namespace Silk.NET.Vulkan;
 
 [Transformed]
 [Flags]
-public enum ExportMetalObjectTypeFlagsEXT
+public enum ExportMetalObjectTypeFlagsEXT : uint
 {
     None = 0x0,
 }

sources/Vulkan/Vulkan/Enums/ExportMetalObjectTypeFlagsEXT.gen.cs

@@ -10,7 +10,7 @@ namespace Silk.NET.Vulkan;
 
 [Transformed]
 [Flags]
-public enum FormatFeatureFlags2 : long
+public enum FormatFeatureFlags2 : ulong
 {
     None = 0x0,
     SampledImageBit = 0x1,