Allow capabilities to be used with `[shader("...")]` (#4928)

* Allow capabilities to be used with `[shader("...")]`

Fixes: #4917

Changes:
1. Allow using capabilities instead of `Stage`s with `EntryPointAttribute`.
2. When resolving capabilities for an entrypoint+profile (per entrypoint) in `resolveStageOfProfileWithEntryPoint` add our `EntryPointAttribute` and resolved capability
3. Added tests and some capabilities related clean-up

* fix a warning made by a mistake in syntax

* change fineStageByName to assume it is passed a stage without a '_'

* test with and without prefix '_'

* cleanup some profiles and reprisentation to work better with 'Stage' and 'Profile'

This use case is why we need to clean all profile-usage into `CapabilityName`s directly.

* change how we compare

* only change profiles

* let all capabilities be resolved by 'shader' profile for now

* fix warning checks I accidently broke

* meshshading_internal to _meshshading

---------

Co-authored-by: Yong He <yonghe@outlook.com>

1 files changed, 7 insertions, 9 deletions

diff --git a/source/slang/slang-ast-modifier.h b/source/slang/slang-ast-modifier.h
index 14e945e25..8c9cb484f 100644
--- a/source/slang/slang-ast-modifier.h
+++ b/source/slang/slang-ast-modifier.h
@@ -924,17 +924,15 @@ class InstanceAttribute : public Attribute
     int32_t value;
 };
 
-// A `[shader("stageName")]` attribute, which marks an entry point
-// to be compiled, and specifies the stage for that entry point
-class EntryPointAttribute : public Attribute 
+// A `[shader("stageName")]`/`[shader("capability")]` attribute which
+// marks an entry point for compiling. This attribute also specifies 
+// the 'capabilities' implicitly supported by an entry point
+class EntryPointAttribute : public Attribute
 {
     SLANG_AST_CLASS(EntryPointAttribute)
- 
-    // The resolved stage that the entry point is targetting.
-    //
-    // TODO: This should be an accessor that uses the
-    // ordinary `args` list, rather than side data.
-    Stage stage;
+
+    // The resolved capailities for our entry point.
+    CapabilitySet capabilitySet;
 };
 
 // A `[__vulkanRayPayload(location)]` attribute, which is used in the