[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/CD3D12Device.h

@@ -0,0 +1,87 @@
+/**
+ * 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 <d3d12.h>
+
+#include "transport/CIVSHMEM.h"
+#include "d3d/CD3D12CommandQueue.h"
+
+using namespace Microsoft::WRL;
+
+struct CD3D12Device
+{
+  private:
+    LUID m_adapterLuid;
+    bool m_debug;
+
+    // static as this needs to persist if set
+    static bool m_indirectCopy;
+
+    ComPtr<ID3D12Debug6    > m_dxDebug;
+    ComPtr<ID3D12InfoQueue1> m_infoQueue;
+    DWORD                    m_callbackCookie;
+
+    ComPtr<IDXGIFactory5> m_factory;
+    ComPtr<IDXGIAdapter1> m_adapter;
+    ComPtr<ID3D12Device3> m_device;
+    ComPtr<ID3D12Heap   > m_ivshmemHeap;
+
+    CD3D12CommandQueue m_copyQueue;
+    CD3D12CommandQueue m_computeQueue;
+    bool                m_computeEnabled           = false;
+    bool                m_ivshmemTextureSupported  = false;
+
+    bool HeapTest();
+
+  public:
+    CD3D12Device(LUID adapterLUID);
+    ~CD3D12Device() { DeInit(); }
+
+    enum InitResult
+    {
+      RETRY,
+      FAILURE,
+      SUCCESS
+    };
+
+    InitResult Init(CIVSHMEM &ivshmem, UINT64 &alignSize,
+      bool enableCompute);
+    void DeInit();
+
+    // Wait for all command queues to finish in-flight GPU work and run their
+    // completion callbacks. Used at swap-chain teardown so no callback touches
+    // resources we are about to release.
+    void WaitForIdle();
+
+    ComPtr<ID3D12Device3> GetDevice() { return m_device; }
+    ComPtr<ID3D12Heap   > GetHeap() { return m_ivshmemHeap; }
+    bool IsIndirectCopy() { return m_indirectCopy; }
+    bool CanUseIVSHMEMTexture() { return m_ivshmemTextureSupported; }
+
+    CD3D12CommandSlot * GetCopySlot   ();
+    CD3D12CommandSlot * GetCopySlot   (unsigned frameIndex);
+    CD3D12CommandSlot * GetComputeSlot(unsigned frameIndex);
+};