rebased on current OSG 3.7.0, support OSG_WINDOWING_SYSTEM environment variable to select specific system, default to working windowing system, update to wl_output v4 protocol for current sway/weston

Author: phlash

src/osg/GraphicsContext.cpp

@@ -75,28 +75,44 @@ GraphicsContext::WindowingSystemInterface* GraphicsContext::WindowingSystemInter
         OSG_WARN<<"Warning: GraphicsContext::WindowingSystemInterfaces::getWindowingSystemInterface() failed, no interfaces available."<<std::endl;
         return 0;
     }
+    std::string search = name;
+    if (getenv("OSG_WINDOWING_SYSTEM") != NULL)
+    {
+        search = getenv("OSG_WINDOWING_SYSTEM");
+    }
 
-    if (!name.empty())
+    if (!search.empty())
     {
         for(Interfaces::iterator itr = _interfaces.begin();
             itr != _interfaces.end();
             ++itr)
         {
-            if ((*itr)->getName()==name)
+            if ((*itr)->getName()==search)
             {
+                OSG_INFO<<"found WindowingSystemInterface : "<<search<<std::endl;
                 return itr->get();
             }
-
-            OSG_NOTICE<<"   tried interface "<<typeid(*itr).name()<<", name= "<<(*itr)->getName()<<std::endl;
         }
 
-        OSG_WARN<<"Warning: GraphicsContext::WindowingSystemInterfaces::getWindowingSystemInterface() failed, no interfaces matches name : "<<name<<std::endl;
+        OSG_WARN<<"Warning: GraphicsContext::WindowingSystemInterfaces::getWindowingSystemInterface() failed, no interfaces matches name : "<<search<<std::endl;
         return 0;
     }
     else
     {
-        // no preference provided so just take the first available interface
-        return _interfaces.front().get();
+        // no preference provided so just take the first available interface that works
+        for (Interfaces::iterator itr = _interfaces.begin();
+            itr != _interfaces.end();
+            ++itr)
+        {
+            if ((*itr)->getNumScreens() > 0)
+            {
+                OSG_INFO<<"using default WindowingSystemInterface : "<<(*itr)->getName()<<std::endl;
+                return itr->get();
+            }
+        }
+
+        OSG_WARN<<"Warning: GraphicsContext::WindowingSystemInterfaces::getWindowingSystemInterface() failed, no working interfaces"<<std::endl;
+        return 0;
     }
 }
 

src/osgViewer/GraphicsWindowWayland.cpp

@@ -482,6 +482,16 @@ class WLWindowingSystemInterface : public osg::GraphicsContext::WindowingSystemI
         WLGWlog(0) << "<output(" << o << ") scale: " << factor << ">" << std::endl;
     }
     static void output_done(void *data, wl_output *wl_output) {}
+    static void output_name(void *data, wl_output *wl_output, const char *name) {
+        WLWindowingSystemInterface* obj = (WLWindowingSystemInterface*) data;
+        int o = obj->find_output(wl_output);
+        WLGWlog(0) << "<output(" << o << ") name: " << name << ">" << std::endl;
+    }
+    static void output_desc(void *data, wl_output *wl_output, const char *desc) {
+        WLWindowingSystemInterface* obj = (WLWindowingSystemInterface*) data;
+        int o = obj->find_output(wl_output);
+        WLGWlog(0) << "<output(" << o << ") desc: " << desc << ">" << std::endl;
+    }
     // Input handling
     WLGraphicsWindow* get_window(struct wl_surface* surface) {
         if (surface) {
@@ -733,7 +743,7 @@ class WLWindowingSystemInterface : public osg::GraphicsContext::WindowingSystemI
             wl_registry_add_listener(_gc.registry, &_wl_registry_listener, this);
             wl_display_roundtrip(_gc.display);
             // ensure we got all required shared objects
-            if (!_gc.compositor || !_gc.shm || !_gc.output || !_gc.xdg_wm_base || !_gc.zxdg_decoration_manager_v1) {
+            if (!_gc.compositor || !_gc.shm || _gc.n_outputs < 1 || !_gc.xdg_wm_base || !_gc.zxdg_decoration_manager_v1) {
                 WLGWlog(0) << "WLwsi::checkInit: missing one of compositor/shm/output/xdg_wm_base/zxdg_decoration_manager_v1" << std::endl;
                 break;
             }
@@ -776,6 +786,8 @@ class WLWindowingSystemInterface : public osg::GraphicsContext::WindowingSystemI
             _wl_output_listener.mode = output_mode;
             _wl_output_listener.scale = output_scale;
             _wl_output_listener.done = output_done;
+            _wl_output_listener.name = output_name;
+            _wl_output_listener.description = output_desc;
             for (size_t o=0; o<_gc.n_outputs; o++)
                 wl_output_add_listener(_gc.output[o], &_wl_output_listener, this);
             // attach ping responder