[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/postprocess/effect/CRGB24Effect.h

@@ -0,0 +1,62 @@
+/**
+ * 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 "CComputeEffect.h"
+
+class CRGB24Effect : public CComputeEffect
+{
+private:
+  struct State;
+  std::shared_ptr<State> m_state;
+  unsigned               m_width  = 0;
+  unsigned               m_height = 0;
+  unsigned               m_pitch  = 0;
+
+public:
+  const char * GetName() const override { return "RGB24"; }
+
+  bool Init(const ComPtr<ID3D12Device3>& device);
+  void ShareState(const CPostProcessEffect& other) override;
+  void Update(const D12FrameFormat& format) override;
+  bool NeedsReconfigure() const override;
+  bool RequiresFullDamage() const override;
+  uint64_t GetTimingToken() const override;
+  void RecordTiming(
+    uint64_t token, bool fullCopy, uint64_t totalTime) override;
+  bool GetCopyLayout(
+    unsigned * pitch, unsigned * dataHeight) const override;
+  bool ShouldCopyFully(
+    const RECT dirtyRects[], unsigned nbDirtyRects) const override;
+  void CopyFrame(
+    const ComPtr<ID3D12GraphicsCommandList>& commandList,
+    ID3D12Resource * dst, ID3D12Resource * src,
+    const RECT dirtyRects[], unsigned nbDirtyRects,
+    bool fullCopy) const override;
+
+  PostProcessStatus SetFormat(const ComPtr<ID3D12Device3>& device,
+    const D12FrameFormat& src, D12FrameFormat& dst) override;
+
+  ComPtr<ID3D12Resource> Run(const ComPtr<ID3D12Device3>& device,
+    const ComPtr<ID3D12GraphicsCommandList>& commandList,
+    const ComPtr<ID3D12Resource>& src, RECT dirtyRects[],
+    unsigned * nbDirtyRects) override;
+};