Support for Payload Access Qualifiers (#3448) (#6595)

* Add support for Ray Payload Access Qualifiers (PAQs) (#3448)

- Added [raypayload] attribute for struct declarations
- Implemented field validation requiring read/write access qualifiers
- Added diagnostic error for missing qualifiers
- Enabled PAQs in DXC compiler and HLSL emission
- Added new test demonstrating PAQ syntax
- Implemented proper handling of ray payload attributes in IR generation

* format code

* Cleanup: Remove unused vars

* Add check to enablePAQ only for profile >= lib_6_7

* Review Fix - Add PAQ support for DX Raytracing

add enablePAQ flag to DownstreamCompileOpitons, improve PAQ handling
update raypayload-attribute-paq.slang to ensure hlsl and dxil is
validated

* Add diagnostic test for missing paq for lib_6_7

Compile using `-disable-payload-qualifiers` aka lib_6_6 profile
raypayload-attribute-no-struct.slang and
raypayload-attribute.slang

---------

Co-authored-by: slangbot <186143334+slangbot@users.noreply.github.com>
Co-authored-by: Ellie Hermaszewska <ellieh@nvidia.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/source/slang/slang-ast-modifier.h b/source/slang/slang-ast-modifier.h
index 5f9ccb5bb..86c1b556c 100644
--- a/source/slang/slang-ast-modifier.h
+++ b/source/slang/slang-ast-modifier.h
@@ -1698,6 +1698,16 @@ class PayloadAttribute : public Attribute
     SLANG_AST_CLASS(PayloadAttribute)
 };
 
+/// A `[raypayload]` attribute indicates that a `struct` type will be used as
+/// a ray payload for `TraceRay()` calls, and thus also as input/output
+/// for shaders in the ray tracing pipeline that might be invoked for
+/// such a ray.
+///
+class RayPayloadAttribute : public Attribute
+{
+    SLANG_AST_CLASS(RayPayloadAttribute)
+};
+
 /// A `[deprecated("message")]` attribute indicates the target is
 /// deprecated.
 /// A compiler warning including the message will be raised if the