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.cpp b/source/slang/slang.cpp
index f08a6fc44..3072ef0a7 100644
--- a/source/slang/slang.cpp
+++ b/source/slang/slang.cpp
@@ -5854,6 +5854,11 @@ void EndToEndCompileRequest::setTargetForceGLSLScalarBufferLayout(int targetInde
     getTargetOptionSet(targetIndex).set(CompilerOptionName::GLSLForceScalarLayout, value);
 }
 
+void EndToEndCompileRequest::setTargetForceDXLayout(int targetIndex, bool value)
+{
+    getTargetOptionSet(targetIndex).set(CompilerOptionName::ForceDXLayout, value);
+}
+
 void EndToEndCompileRequest::setTargetFloatingPointMode(int targetIndex, SlangFloatingPointMode  mode)
 {
     getTargetOptionSet(targetIndex).set(CompilerOptionName::FloatingPointMode, FloatingPointMode(mode));