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, 2 insertions, 2 deletions

diff --git a/tools/gfx-unit-test/ray-tracing-test-shaders.slang b/tools/gfx-unit-test/ray-tracing-test-shaders.slang
index aa2e5055f..c1273a717 100644
--- a/tools/gfx-unit-test/ray-tracing-test-shaders.slang
+++ b/tools/gfx-unit-test/ray-tracing-test-shaders.slang
@@ -1,8 +1,8 @@
 // ray-tracing-test-shaders.slang
 
-struct RayPayload
+struct [raypayload] RayPayload
 {
-    float4 color;
+    float4 color : read(caller) : write(caller, closesthit, miss);
 };
 
 uniform RWTexture2D resultTexture;