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2022-10-20 20:29:11 +08:00
commit 4d531f8044
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+// Viewer.hxx -- alternative flightgear viewer application
+//
+// Copyright (C) 2009 - 2012  Mathias Froehlich
+//
+// 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include "Drawable.hxx"
+
+#include "Viewer.hxx"
+
+#include <simgear/structure/SGWeakPtr.hxx>
+
+namespace fgviewer  {
+
+class Drawable::_ResizedCallback : public osg::GraphicsContext::ResizedCallback {
+public:
+    _ResizedCallback(Drawable* drawable) :
+        _drawable(drawable)
+    { }
+    virtual ~_ResizedCallback()
+    { }
+    virtual void resizedImplementation(osg::GraphicsContext*, int x, int y, int width, int height)
+    {
+        SGSharedPtr<Drawable> drawable = _drawable.lock();
+        if (!drawable.valid())
+            return;
+        drawable->resize(x, y, width, height);
+    }
+    SGWeakPtr<Drawable> _drawable;
+};
+
+Drawable::Drawable(const std::string& name) :
+    _name(name),
+    _position(0, 0),
+    _size(600, 800),
+    _offscreen(false),
+    _fullscreen(false)
+{
+}
+
+Drawable::~Drawable()
+{
+}
+
+void
+Drawable::attachSlaveCamera(SlaveCamera* slaveCamera)
+{
+    if (!slaveCamera)
+        return;
+    _slaveCameraList.push_back(slaveCamera);
+}
+
+bool
+Drawable::resize(int x, int y, int width, int height)
+{
+    unsigned numCameras = _slaveCameraList.size();
+    if (1 < numCameras)
+        return false;
+    _graphicsContext->resizedImplementation(x, y, width, height);
+    if (numCameras < 1)
+        return true;
+    _slaveCameraList.front()->setViewport(SGVec4i(0, 0, width, height));
+    return true;
+}
+    
+bool
+Drawable::realize(Viewer& viewer)
+{
+    if (_graphicsContext.valid())
+        return false;
+    _graphicsContext = _realizeImplementation(viewer);
+    if (!_graphicsContext.valid())
+        return false;
+    _graphicsContext->setResizedCallback(new _ResizedCallback(this));
+    return true;
+}
+    
+osg::GraphicsContext*
+Drawable::_realizeImplementation(Viewer& viewer)
+{
+    osg::ref_ptr<osg::GraphicsContext::Traits> traits = _getTraits(viewer);
+    return viewer.createGraphicsContext(traits.get());
+}
+    
+osg::ref_ptr<osg::GraphicsContext::Traits>
+Drawable::_getTraits(Viewer& viewer)
+{
+    osg::GraphicsContext::ScreenIdentifier screenIdentifier;
+    screenIdentifier.setScreenIdentifier(_screenIdentifier);
+    
+    osg::ref_ptr<osg::GraphicsContext::Traits> traits;
+    traits = viewer.getTraits(screenIdentifier);
+    
+    // The window name as displayed by the window manager
+    traits->windowName = getName();
+    
+    traits->x = _position[0];
+    traits->y = _position[1];
+    if (!_fullscreen) {
+        traits->width = _size[0];
+        traits->height = _size[1];
+    }
+    
+    traits->windowDecoration = !_fullscreen;
+    if (_slaveCameraList.size() <= 1)
+        traits->supportsResize = true;
+    else
+        traits->supportsResize = false;
+    traits->pbuffer = _offscreen;
+    
+    return traits;
+}
+
+} // namespace fgviewer