GLSL Passthrough support for SSBO types (#3446)

* GLSL Passthrough support for SSBO types

* GLSL Passthrough support for SSBO types

* Correctly apply glsl local size layout to entry points during lowering

* Test for glsl layout correctness

* typo

* Reflect GLSL SSBO as raw buffers

* Functional test for glsl ssbo

* Allow allow glsl for render tests

* Functional test for ssbo passthrough

* Functional test for ssbo passthrough with spirv-direct

* fix windows build error

---------

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

1 files changed, 17 insertions, 0 deletions

diff --git a/source/slang/slang-ir-layout.cpp b/source/slang/slang-ir-layout.cpp
index a6684c7b1..9bbdb1aef 100644
--- a/source/slang/slang-ir-layout.cpp
+++ b/source/slang/slang-ir-layout.cpp
@@ -152,10 +152,18 @@ case kIROp_##TYPE##Type:                                        \
         auto structType = cast<IRStructType>(type);
         IRSizeAndAlignment structLayout;
         IRIntegerValue offset = 0;
+        bool seenFinalUnsizedArrayField = false;
         for (auto field : structType->getFields())
         {
+            // If we failed to catch an unsized array earlier in the pipeline,
+            // this will pick it up before generating nonsense results for
+            // subsequent offsets
+            SLANG_ASSERT(!seenFinalUnsizedArrayField);
+
             IRSizeAndAlignment fieldTypeLayout;
             SLANG_RETURN_ON_FAIL(getSizeAndAlignment(target, rules, field->getFieldType(), &fieldTypeLayout));
+            seenFinalUnsizedArrayField = fieldTypeLayout.size == IRSizeAndAlignment::kIndeterminateSize;
+
             structLayout.size = align(offset, fieldTypeLayout.alignment);
             structLayout.alignment = std::max(structLayout.alignment, fieldTypeLayout.alignment);
 
@@ -202,6 +210,15 @@ case kIROp_##TYPE##Type:                                        \
     }
     break;
 
+    case kIROp_UnsizedArrayType:
+    {
+        auto unsizedArrayType = cast<IRUnsizedArrayType>(type);
+        getSizeAndAlignment(target, rules, unsizedArrayType->getElementType(), outSizeAndAlignment);
+        outSizeAndAlignment->size = IRSizeAndAlignment::kIndeterminateSize;
+        return SLANG_OK;
+    }
+    break;
+
     case kIROp_VectorType:
     {
         auto vecType = cast<IRVectorType>(type);