Make various parameters and return types require specialization when targeting WGSL (#5483)

Structured buffer types translate to array types in the WGSL emitter.
WGSL doesn't allow passing runtime-sized arrays to functions.
Similarly for pointers to texture handles.
Also, structured buffers (runtime-sized arrays) cannot be returned in WGSL.

This closes issue #5228, issue #5278 and issue #5288 by enabling specialized functions
to be generated in these cases, in order to work around these constraints.

1 files changed, 14 insertions, 0 deletions

diff --git a/source/slang/slang-type-layout.cpp b/source/slang/slang-type-layout.cpp
index a63d6401e..e36e54531 100644
--- a/source/slang/slang-type-layout.cpp
+++ b/source/slang/slang-type-layout.cpp
@@ -2397,6 +2397,20 @@ bool isCUDATarget(TargetRequest* targetReq)
     }
 }
 
+bool isWGPUTarget(TargetRequest* targetReq)
+{
+    switch (targetReq->getTarget())
+    {
+    default:
+        return false;
+
+    case CodeGenTarget::WGSL:
+    case CodeGenTarget::WGSLSPIRV:
+    case CodeGenTarget::WGSLSPIRVAssembly:
+        return true;
+    }
+}
+
 SourceLanguage getIntermediateSourceLanguageForTarget(TargetProgram* targetProgram)
 {
     // If we are emitting directly, there is no intermediate source language