ENABLE_3DCONNEXION_DEVICES - 1st installment of support for 3Dconnexion devices

Implemented using hidapi library (https://github.com/libusb/hidapi) and https://github.com/koenieee/CrossplatformSpacemouseDriver/tree/master/SpaceMouseDriver as reference

Unsolved issues:

- When manipulating the SpaceNavigator wxWidgets generates a mouse wheel event that needs to be filtered out

- wxWidgets does not detect devices being connected/disconnected to the pc

- Current state forces a continuous rendering

- Current state misses dependence on camera zoom

- Non intuitive movement limits

- Translation and rotation speed factors are hardcoded

- Number of device buttons hardcoded

src/slic3r/GUI/Plater.cpp

@@ -61,6 +61,9 @@
 #include "GUI_Preview.hpp"
 #include "3DBed.hpp"
 #include "Camera.hpp"
+#if ENABLE_3DCONNEXION_DEVICES
+#include "Mouse3DController.hpp"
+#endif // ENABLE_3DCONNEXION_DEVICES
 #include "Tab.hpp"
 #include "PresetBundle.hpp"
 #include "BackgroundSlicingProcess.hpp"
@@ -1367,6 +1370,9 @@ struct Plater::priv
     Sidebar *sidebar;
     Bed3D bed;
     Camera camera;
+#if ENABLE_3DCONNEXION_DEVICES
+    Mouse3DController mouse3d_controller;
+#endif // ENABLE_3DCONNEXION_DEVICES
     View3D* view3D;
     GLToolbar view_toolbar;
     Preview *preview;
@@ -2094,12 +2100,20 @@ Plater::priv::priv(Plater *q, MainFrame *main_frame)
     // updates camera type from .ini file
     camera.set_type(get_config("use_perspective_camera"));
 
+#if ENABLE_3DCONNEXION_DEVICES
+    mouse3d_controller.init();
+#endif // ENABLE_3DCONNEXION_DEVICES
+
     // Initialize the Undo / Redo stack with a first snapshot.
     this->take_snapshot(_(L("New Project")));
 }
 
 Plater::priv::~priv()
 {
+#if ENABLE_3DCONNEXION_DEVICES
+    mouse3d_controller.shutdown();
+#endif // ENABLE_3DCONNEXION_DEVICES
+
     if (config != nullptr)
         delete config;
 }
@@ -3248,6 +3262,11 @@ void Plater::priv::set_current_panel(wxPanel* panel)
             } else
                 view3D->reload_scene(true);
         }
+
+#if ENABLE_3DCONNEXION_DEVICES
+        mouse3d_controller.set_canvas(view3D->get_canvas3d());
+#endif // ENABLE_3DCONNEXION_DEVICES
+
         // sets the canvas as dirty to force a render at the 1st idle event (wxWidgets IsShownOnScreen() is buggy and cannot be used reliably)
         view3D->set_as_dirty();
         view_toolbar.select_item("3D");
@@ -3262,6 +3281,11 @@ void Plater::priv::set_current_panel(wxPanel* panel)
             this->q->reslice();
         // keeps current gcode preview, if any
         preview->reload_print(true);
+
+#if ENABLE_3DCONNEXION_DEVICES
+        mouse3d_controller.set_canvas(preview->get_canvas3d());
+#endif // ENABLE_3DCONNEXION_DEVICES
+
         preview->set_canvas_as_dirty();
         view_toolbar.select_item("Preview");
     }
@@ -5020,6 +5044,18 @@ const Camera& Plater::get_camera() const
     return p->camera;
 }
 
+#if ENABLE_3DCONNEXION_DEVICES
+const Mouse3DController& Plater::get_mouse3d_controller() const
+{
+    return p->mouse3d_controller;
+}
+
+Mouse3DController& Plater::get_mouse3d_controller()
+{
+    return p->mouse3d_controller;
+}
+#endif // ENABLE_3DCONNEXION_DEVICES
+
 bool Plater::can_delete() const { return p->can_delete(); }
 bool Plater::can_delete_all() const { return p->can_delete_all(); }
 bool Plater::can_increase_instances() const { return p->can_increase_instances(); }