Add WGSL pack/unpack, constructor, derivatives & misc intrinsics (#5102)

* Add WGSL pack/unpack intrinsics

This addresses issue #5080.

* Add WGSL constructor intrinsics

This addresses issue #5081.

* Add WGSL derivative and miscellaneous intrinsics

This addresses issue #5083.

* Add some missing WGSL intrinsics

- degrees
- faceforward

1 files changed, 18 insertions, 0 deletions

diff --git a/source/slang/slang-emit-wgsl.cpp b/source/slang/slang-emit-wgsl.cpp
index 0a4cca407..40d8ace91 100644
--- a/source/slang/slang-emit-wgsl.cpp
+++ b/source/slang/slang-emit-wgsl.cpp
@@ -1002,4 +1002,22 @@ void WGSLSourceEmitter::emitFrontMatterImpl(TargetRequest* /* targetReq */)
     }
 }
 
+void WGSLSourceEmitter::emitIntrinsicCallExprImpl(
+    IRCall* inst,
+    UnownedStringSlice intrinsicDefinition,
+    IRInst* intrinsicInst,
+    EmitOpInfo const& inOuterPrec
+    )
+{
+    // The f16 constructor is generated for f32tof16
+    if (intrinsicDefinition.startsWith("f16"))
+    {
+        m_f16ExtensionEnabled = true;
+    }
+
+    CLikeSourceEmitter::emitIntrinsicCallExprImpl(
+        inst, intrinsicDefinition, intrinsicInst, inOuterPrec
+    );
+}
+
 } // namespace Slang