Implement `-fvk-use-dx-layout` (#4912)

* Implement `-fvk-use-dx-layout`

Fixes: #4126

Changes:
* Added fvk-use-dx-layout
* Modified `HLSLConstantBufferLayoutRulesImpl` for correctness (ex: Array is always 16 byte aligned)
* Added kFXCShaderResourceLayoutRulesFamilyImpl and kFXCConstantBufferLayoutRulesFamilyImpl to handle fvk-use-dx-layout
* Added `ConstantBufferLayoutRules` to manage constant buffer rules
* Added `alignCompositeElementOfNonAggregate`/`alignCompositeElementOfAggregate` to handle forced alignment of composites for ConstantBuffers
* `StructuredBuffer` rules are mostly equal to `scalar` layout, not much was needed to be changed to support this behavior.

* seperate legacy constant buffer and how Slang does constant-buffer normally

* undo an addition

* remove accidental test

* Address review and fix

Address review and remove GLSL support since GLSL requires a seperate legalization (need to linearlize structs like with `legalizeMetalIR` to assign explicit offsets)

* comments

* remove aggregate and non-aggregate logic

We don't need this distinction for the logic

---------

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

1 files changed, 5 insertions, 0 deletions

diff --git a/source/slang/slang-compiler-options.h b/source/slang/slang-compiler-options.h
index dae6d49e5..f2bf467e2 100644
--- a/source/slang/slang-compiler-options.h
+++ b/source/slang/slang-compiler-options.h
@@ -346,6 +346,11 @@ namespace Slang
             return getBoolOption(CompilerOptionName::GLSLForceScalarLayout);
         }
 
+        bool shouldUseDXLayout()
+        {
+            return getBoolOption(CompilerOptionName::ForceDXLayout);
+        }
+
         bool shouldDumpIntermediates()
         {
             return getBoolOption(CompilerOptionName::DumpIntermediates);