Streamline shader object creation (#1717)

This change kind of rolls together two different simplifications:

1. The `createShaderObject()` shouldn't really need to take an `IShaderObjectLayout` because it could just take the `slang::TypeLayoutReflection` instead and create the shader-object layout behind the scenes.

2. For that matter, it needn't take a `slang::TypeLayoutReflection` either, becaues it could just take a `slang::TypeReflection` and query the layout of that type behind the scenes.

The combination of these two changes means:

* `IShaderObjectLayout` is gone from the public API, as is `createShaderObjectLayout()`

* `createShaderObject()` directly takes a `slang::TypeReflection` and allocates a shader object of that type

The result is simpler and more streamlined application code.

Note that under the hood the implementation still has shader-object layouts, using the `ShaderObjectLayoutBase` class. A few locations had to change to use `RefPtr`s instead of `ComPtr`s now that the class is no longer a public COM-lite API type.

The hope is that this change makes it easier to allocate/cache layouts for things like specialized types "under the hood," as is needed to implement parameter setting for static specialization.

1 files changed, 6 insertions, 4 deletions

diff --git a/tools/gfx/render-graphics-common.h b/tools/gfx/render-graphics-common.h
index 59dfb888a..e41fc6ee1 100644
--- a/tools/gfx/render-graphics-common.h
+++ b/tools/gfx/render-graphics-common.h
@@ -20,10 +20,12 @@ private:
 class GraphicsAPIRenderer : public RendererBase
 {
 public:
-    virtual SLANG_NO_THROW Result SLANG_MCALL createShaderObjectLayout(
-        slang::TypeLayoutReflection* typeLayout, IShaderObjectLayout** outLayout) SLANG_OVERRIDE;
-    virtual SLANG_NO_THROW Result SLANG_MCALL
-        createShaderObject(IShaderObjectLayout* layout, IShaderObject** outObject) SLANG_OVERRIDE;
+    virtual Result createShaderObjectLayout(
+        slang::TypeLayoutReflection*    typeLayout,
+        ShaderObjectLayoutBase**        outLayout) SLANG_OVERRIDE;
+    virtual Result createShaderObject(
+        ShaderObjectLayoutBase* layout,
+        IShaderObject**         outObject) SLANG_OVERRIDE;
     virtual SLANG_NO_THROW Result SLANG_MCALL createRootShaderObject(
         IShaderProgram* program,
         IShaderObject** outObject) SLANG_OVERRIDE;