Implementing `tbuffer` layout(s) (#4436)

* Implementing `tbuffer` layouts.

1. Add to layout options 'TextureBuffer' layouts.
2. Add on to existing logic a way to allocate appropriate registers for TextureBufferType (this was made to work with parameter block logic).
3. Added asserts so objects missing a layout will gracefully crash

This means `tbuffer` now works for hlsl,glsl,metal targets, spirv has yet to implement logic for `TextureBufferType`.

* disable metal tests and fix emitting code a bit

fixing the emitting code means metal compilation emits a useful error (help point users/developers to #4435)

* fix warning

1 files changed, 4 insertions, 1 deletions

diff --git a/source/slang/slang-type-layout.h b/source/slang/slang-type-layout.h
index 6ca756e8c..f29a38435 100644
--- a/source/slang/slang-type-layout.h
+++ b/source/slang/slang-type-layout.h
@@ -1043,16 +1043,19 @@ struct LayoutRulesImpl
 
     UniformLayoutInfo BeginStructLayout()
     {
+        SLANG_ASSERT(simpleRules);
         return simpleRules->BeginStructLayout();
     }
 
     LayoutSize AddStructField(UniformLayoutInfo* ioStructInfo, UniformLayoutInfo fieldInfo)
     {
+        SLANG_ASSERT(simpleRules);
         return simpleRules->AddStructField(ioStructInfo, fieldInfo);
     }
 
     void EndStructLayout(UniformLayoutInfo* ioStructInfo)
     {
+        SLANG_ASSERT(simpleRules);
         return simpleRules->EndStructLayout(ioStructInfo);
     }
 
@@ -1080,7 +1083,7 @@ struct LayoutRulesFamilyImpl
     virtual LayoutRulesImpl* getAnyValueRules()             = 0;
     virtual LayoutRulesImpl* getConstantBufferRules(CompilerOptionSet& compilerOptions) = 0;
     virtual LayoutRulesImpl* getPushConstantBufferRules()   = 0;
-    virtual LayoutRulesImpl* getTextureBufferRules()        = 0;
+    virtual LayoutRulesImpl* getTextureBufferRules(CompilerOptionSet& compilerOptions) = 0;
     virtual LayoutRulesImpl* getVaryingInputRules()         = 0;
     virtual LayoutRulesImpl* getVaryingOutputRules()        = 0;
     virtual LayoutRulesImpl* getSpecializationConstantRules()= 0;