Various fixes to make `model-viewer` example almost working. (#1801)

* Fixing `PseudoPtr` legalization and `gfx` lifetime issues.

* Fixing `model-viewer` example.

This change contains various fixes to bring `model-viewer` example to fully functional. These fixes include:
1. Add `spReflectionTypeLayout_getSubObjectRangeSpaceOffset` function to return the space index for a sub object referenced through a `ParameterBlock` binding.
2. Make sure `D3D12Device` specifies column major matrix order creating a Slang session.
3. Fix `platform::Window::close()` and `platform::Application::quit()`.
4. Fix memory leak during `model-viewer''s model loading.
5. Fix command buffer recording in `model-viewer`.

With these changes, model viewer can now produce an image with a gray cube. The lighting is still incorrect becuase the `gfx` shader object implementation still does not handle "pending layout" resulting from global existential parameters.

* Fix d3d12 root signature creation.

* Use row-major matrix layout in model-viewer

1 files changed, 2 insertions, 21 deletions

diff --git a/tools/gfx/open-gl/render-gl.cpp b/tools/gfx/open-gl/render-gl.cpp
index c0b739096..fb8502485 100644
--- a/tools/gfx/open-gl/render-gl.cpp
+++ b/tools/gfx/open-gl/render-gl.cpp
@@ -201,17 +201,9 @@ public:
         GLsizei                 offset;
     };
 
-    class InputLayoutImpl: public IInputLayout, public ComObject
+    class InputLayoutImpl : public InputLayoutBase
 	{
     public:
-        SLANG_COM_OBJECT_IUNKNOWN_ALL
-        IInputLayout* getInterface(const Guid& guid)
-        {
-            if (guid == GfxGUID::IID_ISlangUnknown || guid == GfxGUID::IID_IInputLayout)
-                return static_cast<IInputLayout*>(this);
-            return nullptr;
-        }
-    public:
         VertexAttributeDesc m_attributes[kMaxVertexStreams];
         UInt m_attributeCount = 0;
     };
@@ -329,20 +321,9 @@ public:
         GLuint                      m_bufferID;
     };
 
-    class FramebufferLayoutImpl
-        : public IFramebufferLayout
-        , public ComObject
+    class FramebufferLayoutImpl : public FramebufferLayoutBase
     {
     public:
-        SLANG_COM_OBJECT_IUNKNOWN_ALL
-        IFramebufferLayout* getInterface(const Guid& guid)
-        {
-            if (guid == GfxGUID::IID_ISlangUnknown || guid == GfxGUID::IID_IFramebufferLayout)
-                return static_cast<IFramebufferLayout*>(this);
-            return nullptr;
-        }
-
-    public:
         ShortList<IFramebufferLayout::AttachmentLayout> m_renderTargets;
         bool m_hasDepthStencil = false;
         IFramebufferLayout::AttachmentLayout m_depthStencil;