[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/CInteropResourcePool.cpp

@@ -0,0 +1,70 @@
+/**
+ * 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
+ */
+
+#include "d3d/CInteropResourcePool.h"
+#include "CDebug.h"
+
+void CInteropResourcePool::Init(
+  std::shared_ptr<CD3D11Device> dx11Device,
+  std::shared_ptr<CD3D12Device> dx12Device)
+{
+  Reset();
+  m_dx11Device = dx11Device;
+  m_dx12Device = dx12Device;
+}
+
+void CInteropResourcePool::Reset()
+{
+  for (unsigned i = 0; i < POOL_SIZE; ++i)
+    m_pool[i].Reset();
+  m_dx11Device.reset();
+  m_dx12Device.reset();
+}
+
+CInteropResource * CInteropResourcePool::Get(
+  ComPtr<ID3D11Texture2D> srcTex)
+{
+  CInteropResource * res;
+  unsigned freeSlot = POOL_SIZE;
+  for (unsigned i = 0; i < POOL_SIZE; ++i)
+  {
+    res = &m_pool[i];
+    if (!res->IsReady())
+    {
+      freeSlot = min(freeSlot, i);
+      continue;
+    }
+
+    if (res->Compare(srcTex))
+      return res;
+  }
+
+  if (freeSlot == POOL_SIZE)
+  {
+    DEBUG_ERROR("Interop Resouce Pool Full");
+    return nullptr;
+  }
+
+  res = &m_pool[freeSlot];
+  if (!res->Init(m_dx11Device, m_dx12Device, srcTex))
+    return nullptr;
+
+  return res;
+}