[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/capture/CFrameBufferPool.h

@@ -0,0 +1,45 @@
+/**
+ * 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 "capture/CFrameBufferResource.h"
+#include "capture/FrameBufferTypes.h"
+#include "common/KVMFR.h"
+
+struct CD3D12Device;
+class CFrameTransport;
+
+class CFrameBufferPool
+{
+private:
+  CFrameTransport * m_transport = nullptr;
+  CD3D12Device    * m_dx12      = nullptr;
+
+  CFrameBufferResource m_buffers[LGMP_Q_FRAME_BUFFER_LEN];
+
+public:
+  void Init(CFrameTransport * transport, CD3D12Device * dx12);
+  void Reset();
+
+  CFrameBufferResource * Get(const PreparedFrameBuffer& buffer,
+    size_t minSize,
+    const D3D12_RESOURCE_DESC * textureDesc = nullptr);
+};