Metal: rewrite global variables as explicit context. (#3981)

* Metal: rewrite global variables as explicit context.

* Small tweaks.

1 files changed, 7 insertions, 0 deletions

diff --git a/source/slang/slang-emit.cpp b/source/slang/slang-emit.cpp
index c00c7bfc3..b7227a4f0 100644
--- a/source/slang/slang-emit.cpp
+++ b/source/slang/slang-emit.cpp
@@ -69,6 +69,7 @@
 #include "slang-ir-synthesize-active-mask.h"
 #include "slang-ir-validate.h"
 #include "slang-ir-wrap-structured-buffers.h"
+#include "slang-ir-wrap-global-context.h"
 #include "slang-ir-liveness.h"
 #include "slang-ir-glsl-liveness.h"
 #include "slang-ir-translate-glsl-global-var.h"
@@ -1082,6 +1083,12 @@ Result linkAndOptimizeIR(
         validateIRModuleIfEnabled(codeGenContext, irModule);
     }
 
+    // Metal does not allow global variables and global parameters, so
+    // we need to convert them into an explicit global context parameter
+    // passed around through a function parameter.
+    if (target == CodeGenTarget::Metal)
+        wrapGlobalScopeInContextType(irModule);
+
     auto metadata = new ArtifactPostEmitMetadata;
     outLinkedIR.metadata = metadata;