Merge from v0.9.15 (#460)

* Fix bug when subscripting a type that must be split (#396)

The logic was creating a `PairPseudoExpr` as part of a subscript (`operator[]`) operation, but neglecting to fill in its `pairInfo` field, which led to a null-pointer crash further along.

* Allow writes to UAV textures (#416)

Work on #415

This issue is already fixed in the `v0.10.*` line, but I'm back-porting the fix to `v0.9.*`.
The issue here was that the stdlib declarations for texture types were only including the `get` accessor for subscript operations, even if the texture was write-able.

I've also included the fixes for other subscript accessors in the stdlib (notably that `OutputPatch<T>` is readable, but not writable, despite what the name seems to imply).

* Fix infinite loop in semantic parsing (#424)

The code for parsing semantics was looking for a fixed set of tokens to terminate a semantic list, rather than assuming that whenever you don't see a `:` ahead, you probably are done with semantics. This meant that you could get into an infinite loop just with simple mistakes like leaving out a `;`.

This change fixes the parser to note infinite loop in this case, and adds a test case to verify the fix.

* Expose HLSL `shared` modifier through reflection. (#436)

This is a request from Falcor, because the `shared` modifier can be used as a hint to optimize the grouping of parameters for binding. The intention is that `shared` marks shader parameters (including parameter blocks) that will us the same values across many draw calls (e.g., per-frame data, as opposed to per-model or per-instance).

The mechanism I'm using here is to provide a general reflection API for exposing the `Modifier`s already attached to declarations. While the only modifier exposed is `shared`, and the only modifier information being exposed is presence/absence, this interface could be extended down the line.

1 files changed, 20 insertions, 0 deletions

diff --git a/source/slang/reflection.cpp b/source/slang/reflection.cpp
index 65901d6af..20cd188de 100644
--- a/source/slang/reflection.cpp
+++ b/source/slang/reflection.cpp
@@ -681,6 +681,26 @@ SLANG_API SlangReflectionType* spReflectionVariable_GetType(SlangReflectionVaria
     return  convert(var->getType());
 }
 
+SLANG_API SlangReflectionModifier* spReflectionVariable_FindModifier(SlangReflectionVariable* inVar, SlangModifierID modifierID)
+{
+    auto var = convert(inVar);
+    if(!var) return nullptr;
+
+    Modifier* modifier = nullptr;
+    switch( modifierID )
+    {
+    case SLANG_MODIFIER_SHARED:
+        modifier = var->FindModifier<HLSLEffectSharedModifier>();
+        break;
+
+    default:
+        return nullptr;
+    }
+
+    return (SlangReflectionModifier*) modifier;
+}
+
+
 // Variable Layout Reflection
 
 SLANG_API SlangReflectionVariable* spReflectionVariableLayout_GetVariable(SlangReflectionVariableLayout* inVarLayout)