refs #204 stub project for XBus, an X-Plane plugin (not client plugin) which will communicate with the client

client.pro

@@ -27,6 +27,7 @@ contains(BLACK_CONFIG, BlackSim) {
     }
 
     contains(BLACK_CONFIG, XPlane) {
+        SUBDIRS += src/blacksim/xplane/xbus/xbus.pro
         SUBDIRS += src/blacksim/xplane/plugin/plugin_xplane.pro
     }
 }

src/blacksim/xplane/xbus/main.cpp

@@ -0,0 +1,45 @@
+/*  Copyright (C) 2013 VATSIM Community / contributors
+ *  This Source Code Form is subject to the terms of the Mozilla Public
+ *  License, v. 2.0. If a copy of the MPL was not distributed with this
+ *  file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#define _CRT_SECURE_NO_WARNINGS
+#include "stub.h"
+#include "utils.h"
+#include <cstring>
+
+QSharedPointer<QApplication> g_qApp;
+XBus::CStub *g_stub;
+
+PLUGIN_API int XPluginStart(char *o_name, char *o_sig, char *o_desc)
+{
+    std::strcpy(o_name, "X-Bus");
+    std::strcpy(o_sig, "net.vatsim.XBus");
+    std::strcpy(o_desc, "Allows pilot client to connect to X-Plane via D-Bus");
+    return 1;
+}
+
+PLUGIN_API void XPluginStop()
+{
+}
+
+PLUGIN_API int XPluginEnable()
+{
+    g_qApp = QSharedApplication::sharedInstance();
+    QXPlaneEventLoop::exec();
+    g_stub = new XBus::CStub;
+    return 1;
+}
+
+PLUGIN_API void XPluginDisable()
+{
+    delete g_stub;
+    g_qApp.reset();
+}
+
+PLUGIN_API void XPluginReceiveMessage(XPLMPluginID from, long msg, void *param)
+{
+    Q_UNUSED(from);
+    Q_UNUSED(msg);
+    Q_UNUSED(param);
+}

src/blacksim/xplane/xbus/stub.h

@@ -0,0 +1,27 @@
+/*  Copyright (C) 2013 VATSIM Community / contributors
+ *  This Source Code Form is subject to the terms of the Mozilla Public
+ *  License, v. 2.0. If a copy of the MPL was not distributed with this
+ *  file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef BLACKSIM_XBUS_STUB_H
+#define BLACKSIM_XBUS_STUB_H
+
+/*!
+ * \file
+ */
+
+/*!
+ * \namespace XBus
+ */
+
+namespace XBus
+{
+    /*!
+     * stub
+     */
+    class CStub
+    {
+    };
+}
+
+#endif // guard

src/blacksim/xplane/xbus/utils.h

@@ -0,0 +1,87 @@
+/*  Copyright (C) 2013 VATSIM Community / contributors
+ *  This Source Code Form is subject to the terms of the Mozilla Public
+ *  License, v. 2.0. If a copy of the MPL was not distributed with this
+ *  file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef BLACKSIM_XBUS_UTILS_H
+#define BLACKSIM_XBUS_UTILS_H
+
+#include <XPLM/XPLMDefs.h>
+#include <XPLM/XPLMPlugin.h>
+#include <XPLM/XPLMProcessing.h>
+#include <QApplication>
+#include <QSharedPointer>
+
+/*!
+ * \file
+ */
+
+/*!
+ * QApplication subclass used by XBus.
+ *
+ * Only one instance of QApplication is allowed per process, so if any other
+ * X-Plane plugin, completely unrelated to this pilot client, wants to use the
+ * Qt framework, they can simply copy & paste this class into their project
+ * and both X-Plane plugins will be able to share a single QApplication safely.
+ */
+class QSharedApplication : public QApplication
+{
+    Q_OBJECT
+
+    QWeakPointer<QApplication> m_weakptr;
+
+    QSharedApplication(QSharedPointer<QApplication> &ptr, int argc, char **argv) : QApplication(argc, argv)
+    {
+        ptr.reset(this);
+        m_weakptr = ptr;
+    }
+
+public:
+    static QSharedPointer<QApplication> sharedInstance()
+    {
+        QSharedPointer<QApplication> ptr;
+        if (! instance())
+        {
+            static int argc = 1;
+            static char *argv[] = { "X-Plane" };
+            new QSharedApplication(ptr, argc, argv);
+        }
+        return qobject_cast<QSharedApplication*>(instance())->m_weakptr;
+    }
+};
+
+/*!
+ * Runs the Qt event loop inside the X-Plane event loop.
+ */
+class QXPlaneEventLoop : public QObject
+{
+    Q_OBJECT
+
+    QXPlaneEventLoop(QObject *parent) : QObject(parent)
+    {
+        XPLMRegisterFlightLoopCallback(callback, -1, nullptr);
+    }
+
+    ~QXPlaneEventLoop()
+    {
+        XPLMUnregisterFlightLoopCallback(callback, nullptr);
+    }
+
+    static float callback(float, float, int, void *)
+    {
+        QApplication::processEvents();
+        QApplication::sendPostedEvents();
+        return -1;
+    }
+
+public:
+    static void exec()
+    {
+        if (! QApplication::instance()->findChild<QXPlaneEventLoop *>())
+        {
+            new QXPlaneEventLoop(QApplication::instance());
+        }
+    }
+};
+
+#endif // guard

src/blacksim/xplane/xbus/xbus.pro

@@ -0,0 +1,71 @@
+include (../../../../config.pri)
+include (../../../../build.pri)
+
+QT       += core gui widgets dbus network
+
+TEMPLATE = lib
+
+CONFIG += shared
+CONFIG += blackmisc
+
+LIBS += -lXPLM
+
+DEPENDPATH += . ../../../../src
+INCLUDEPATH += . ../../../../src
+
+SOURCES += *.cpp
+HEADERS += *.h
+
+#win32:!win32-g++*: PRE_TARGETDEPS += ../../../../lib/blackmisc.lib
+
+
+# Required by X-Plane SDK
+DEFINES += XPLM200=1
+win32:DEFINES += IBM
+linux:DEFINES += LIN
+macx:DEFINES += APL
+
+# X-Plane plugins must follow a prescribed filename and directory structure.
+# CPU architecture detection copied from externals.pri;
+# TODO: refactor so detection is is done in only one place.
+TARGET_EXT = .xpl
+win32:TARGET = win
+linux:TARGET = lin
+macx:TARGET = mac
+win32:contains(QMAKE_TARGET.arch, x86_64) {
+    DESTDIR = ../../../../xbus/64
+}
+win32:contains(QMAKE_TARGET.arch, x86) {
+    DESTDIR = ../../../../xbus/32
+}
+win32-g++ {
+    WIN_FIND = $$(SYSTEMROOT)\system32\find
+    MINGW64 = $$system($$QMAKE_CXX -Q --help=target | $$WIN_FIND \"-m64\")
+    contains(MINGW64,[enabled]) {
+        DESTDIR = ../../../../xbus/64
+    }
+    else {
+        DESTDIR = ../../../../xbus/32
+    }
+}
+linux-g++ {
+    GCC64 = $$system($$QMAKE_CXX -Q --help=target | grep m64)
+    contains(GCC64,[enabled]) {
+        DESTDIR = ../../../../xbus/64
+    }
+    else {
+        DESTDIR = ../../../../xbus/32
+    }
+}
+linux-g++-64 {
+    DESTDIR = ../../../../xbus/64
+}
+linux-g++-32 {
+    DESTDIR = ../../../../xbus/32
+}
+macx {
+    # a single dylib file contains both 32bit and 64bit binaries
+    DESTDIR = ../../../../xbus
+}
+
+include (../../../../libraries.pri)