[idd] project: organize driver sources by responsibility

Group the IDD sources and Visual Studio filters by subsystem.

Split the device and swap-chain implementations into focused units,
rename the context classes, and reduce header coupling.

idd/LGIdd/d3d/CD3D11Device.h

@@ -0,0 +1,57 @@
+/**
+ * Looking Glass
+ * Copyright © 2017-2026 The Looking Glass Authors
+ * https://looking-glass.io
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc., 59
+ * Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#pragma once
+
+#include <Windows.h>
+#include <wdf.h>
+#include <wrl.h>
+#include <dxgi1_5.h>
+#include <d3d11_4.h>
+
+using namespace Microsoft::WRL;
+
+struct CD3D11Device
+{
+private:
+  LUID m_adapterLuid;
+  ComPtr<IDXGIFactory5       > m_factory;
+  ComPtr<IDXGIAdapter1       > m_adapter;
+  ComPtr<ID3D11Device5       > m_device;
+  ComPtr<ID3D11DeviceContext4> m_context;
+  bool m_isSoftware = false;
+
+public:
+  CD3D11Device(LUID adapterLuid) :
+    m_adapterLuid(adapterLuid) {};
+
+  CD3D11Device()
+  {
+    m_adapterLuid = LUID{};
+  }
+
+  HRESULT Init();
+
+  ComPtr<ID3D11Device5> GetDevice() { return m_device; }
+
+  ComPtr<ID3D11DeviceContext4> GetContext() { return m_context; }
+
+  bool IsSoftware() { return m_isSoftware; }
+};