[idd] transport: abstract LGMP implementation

Introduce transport, frame, and control interfaces with an LGMP factory backend. Move LGMP and IVSHMEM implementation details under transport/lgmp and expose direct frame-buffer memory through a neutral capability.
2026-08-09 08:41:31 +00:00 · 2026-08-07 16:39:07 +10:00
parent 30a1383d5e
commit 6725133375
46 changed files with 1026 additions and 480 deletions
--- a/idd/LGIdd/transport/lgmp/CLGMPControl.h
+++ b/idd/LGIdd/transport/lgmp/CLGMPControl.h
@@ -0,0 +1,85 @@
+/**
+ * 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 "transport/lgmp/CLGMPHost.h"
+#include "transport/IControlTransport.h"
+
+#include "common/KVMFR.h"
+
+#include <Windows.h>
+#include <wdf.h>
+#include <IddCx.h>
+
+#include <memory>
+
+class CLGMPTransport;
+
+class CLGMPControl final : public IControlTransport
+{
+private:
+  friend class CLGMPTransport;
+
+  static constexpr int POINTER_SHAPE_BUFFERS   = 3;
+  static constexpr int COLOR_TRANSFORM_BUFFERS = 3;
+
+  CLGMPHost& m_host;
+
+  PLGMPHostQueue m_pointerQueue = nullptr;
+  PLGMPMemory    m_pointerMemory[LGMP_Q_POINTER_LEN] = {};
+  PLGMPMemory    m_pointerShapeMemory[POINTER_SHAPE_BUFFERS] = {};
+  PLGMPMemory    m_pointerTransformMemory[COLOR_TRANSFORM_BUFFERS] = {};
+  PLGMPMemory    m_pointerShape = nullptr;
+  int  m_pointerMemoryIndex    = 0;
+  int  m_pointerShapeIndex     = 0;
+  int  m_pointerTransformIndex = 0;
+  bool m_cursorVisible         = false;
+  int  m_cursorX               = 0;
+  int  m_cursorY               = 0;
+
+  mutable SRWLOCK                         m_colorTransformLock = SRWLOCK_INIT;
+  std::shared_ptr<const D12ColorTransform> m_colorTransform;
+
+  void SendColorTransform();
+  void ResendCursor();
+  bool Initialize();
+  void DeInit();
+  LGMP_STATUS ReadDataWithSource(void * data, size_t * size,
+    uint32_t * sourceClientID);
+  LGMP_STATUS AckData();
+  bool HasNewSubscribers();
+  void ResendState();
+
+public:
+  explicit CLGMPControl(CLGMPHost& host) :
+    m_host(host) {}
+  ~CLGMPControl() override;
+
+  CLGMPControl(const CLGMPControl&) = delete;
+  CLGMPControl& operator=(const CLGMPControl&) = delete;
+
+  void SendCursor(const IDARG_OUT_QUERY_HWCURSOR& info, const BYTE * data,
+    UINT sdrWhiteLevel) override;
+  void SetColorTransform(
+    std::shared_ptr<const D12ColorTransform> transform) override;
+  std::shared_ptr<const D12ColorTransform>
+    GetColorTransform() const override;
+};