Fix types for `InputPatch` and `OutputPatch`

Fixes #34.

I'd declared these as if they were `InputPatch<T>`, but they are really `InputPatch<T,N>`.
This change fixes the declarations, and makes these types no longer inherit from the contrived `BuiltinGenericType`.
Instead they are more-or-less ordinary `DeclRefType`s using the same approach that `MatrixExpressionType` uses.

1 files changed, 9 insertions, 2 deletions

diff --git a/source/slang/syntax.h b/source/slang/syntax.h
index 56574d124..66eddc536 100644
--- a/source/slang/syntax.h
+++ b/source/slang/syntax.h
@@ -1044,8 +1044,15 @@ namespace Slang
     class HLSLAppendStructuredBufferType : public BuiltinGenericType {};
     class HLSLConsumeStructuredBufferType : public BuiltinGenericType {};
 
-    class HLSLInputPatchType : public BuiltinGenericType {};
-    class HLSLOutputPatchType : public BuiltinGenericType {};
+    class HLSLPatchType : public DeclRefType
+    {
+    public:
+        ExpressionType* getElementType();
+        IntVal*         getElementCount();
+    };
+
+    class HLSLInputPatchType : public HLSLPatchType {};
+    class HLSLOutputPatchType : public HLSLPatchType {};
 
     // HLSL geometry shader output stream types