Fix issue with outputting "static" in GLSL (#1006)

This appears to be a regression introduced in #1001, and missed because none of our existing tests covered `static const` arrays on the GLSL/SPIR-V targets.

The basic problem is that we cannot output a `static const` definition in GLSL because `static` is a reserved word and not a keyword. Instead for GLSL we just want a `const` array. This change makes the emission of `static` for global-scope constants key on the target language for code generation, and only emit it for HLSL, C, and C++.

This change also adds a test case specifically for running Slang input that has a `static const` array on the Vulkan target.

1 files changed, 14 insertions, 1 deletions

diff --git a/source/slang/slang-emit-c-like.cpp b/source/slang/slang-emit-c-like.cpp
index d7930130e..c7b5b602b 100644
--- a/source/slang/slang-emit-c-like.cpp
+++ b/source/slang/slang-emit-c-like.cpp
@@ -982,7 +982,20 @@ void CLikeSourceEmitter::emitInstResultDecl(IRInst* inst)
     if(as<IRModuleInst>(inst->getParent()))
     {
         // "Ordinary" instructions at module scope are constants
-        m_writer->emit("static const ");
+
+        switch (getSourceStyle())
+        {
+        case SourceStyle::HLSL:
+        case SourceStyle::C:
+        case SourceStyle::CPP:
+            m_writer->emit("static ");
+            break;
+
+        default:
+            break;
+        }
+
+        m_writer->emit("const ");
     }
 
     emitType(type, getName(inst));