Add support for bitfields (#3639)

* Add support for bitfields

Closes https://github.com/shader-slang/slang/issues/3559

* Set scopes for syntsized bitfield accessors

* Simplify generated code for bitfield accessors

* spelling

* regenerate vs project

* warnings

1 files changed, 39 insertions, 0 deletions

diff --git a/source/slang/slang-ir.cpp b/source/slang/slang-ir.cpp
index 3f10e3d3e..68b002153 100644
--- a/source/slang/slang-ir.cpp
+++ b/source/slang/slang-ir.cpp
@@ -7277,6 +7277,19 @@ namespace Slang
         }
     }
 
+    IROp getIntTypeOpFromInfo(const IntInfo info)
+    {
+        switch(info.width)
+        {
+            case 8: return info.isSigned ? kIROp_Int8Type : kIROp_UInt8Type;
+            case 16: return info.isSigned ? kIROp_Int16Type : kIROp_UInt16Type;
+            case 32: return info.isSigned ? kIROp_IntType : kIROp_UIntType;
+            case 64: return info.isSigned ? kIROp_Int64Type : kIROp_UInt64Type;
+            default:
+                SLANG_UNEXPECTED("Unhandled info passed to getIntTypeOpFromInfo");
+        }
+    }
+
     FloatInfo getFloatingTypeInfo(const IRType* floatType)
     {
         switch(floatType->getOp())
@@ -7303,6 +7316,32 @@ namespace Slang
         }
     }
 
+    IRStructField* findStructField(IRInst* type, IRStructKey* key)
+    {
+        if (auto irStructType = as<IRStructType>(type))
+        {
+            for (auto field : irStructType->getFields())
+            {
+                if (field->getKey() == key)
+                {
+                    return field;
+                }
+            }
+        }
+        else if (auto irSpecialize = as<IRSpecialize>(type))
+        {
+            if (auto irGeneric = as<IRGeneric>(irSpecialize->getBase()))
+            {
+                if (auto irGenericStructType = as<IRStructType>(findInnerMostGenericReturnVal(irGeneric)))
+                {
+                    return findStructField(irGenericStructType, key);
+                }
+            }
+        }
+
+        return nullptr;
+    }
+
     void findAllInstsBreadthFirst(IRInst* inst, List<IRInst*>& outInsts)
     {
         Index index = outInsts.getCount();