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2022-10-20 20:29:11 +08:00
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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 "Renderer.hxx"
+
+#include <osgViewer/Renderer>
+#include <simgear/scene/material/EffectCullVisitor.hxx>
+
+#include "Drawable.hxx"
+#include "Viewer.hxx"
+#include "SlaveCamera.hxx"
+
+namespace fgviewer  {
+
+// FIXME I understand why we currently need this, but this seems like
+// weird to require an own cull visitor.
+static void installCullVisitor(osg::Camera& camera)
+{
+    osgViewer::Renderer* renderer = static_cast<osgViewer::Renderer*>(camera.getRenderer());
+    for (int i = 0; i < 2; ++i) {
+        osgUtil::SceneView* sceneView = renderer->getSceneView(i);
+        osg::ref_ptr<osgUtil::CullVisitor::Identifier> identifier;
+
+        identifier = sceneView->getCullVisitor()->getIdentifier();
+        sceneView->setCullVisitor(new simgear::EffectCullVisitor);
+        sceneView->getCullVisitor()->setIdentifier(identifier.get());
+
+        identifier = sceneView->getCullVisitorLeft()->getIdentifier();
+        sceneView->setCullVisitorLeft(sceneView->getCullVisitor()->clone());
+        sceneView->getCullVisitorLeft()->setIdentifier(identifier.get());
+
+        identifier = sceneView->getCullVisitorRight()->getIdentifier();
+        sceneView->setCullVisitorRight(sceneView->getCullVisitor()->clone());
+        sceneView->getCullVisitorRight()->setIdentifier(identifier.get());
+    }
+}
+
+class Renderer::_SlaveCamera : public SlaveCamera {
+public:
+    _SlaveCamera(const std::string& name) :
+        SlaveCamera(name)
+    { 
+    }
+    virtual ~_SlaveCamera()
+    {
+    }
+    virtual osg::Camera* _realizeImplementation(Viewer& viewer)
+    {
+        osg::Camera* camera = SlaveCamera::_realizeImplementation(viewer);
+        if (!camera)
+            return 0;
+
+        camera->addChild(viewer.getSceneDataGroup());
+
+        viewer.addSlave(camera, osg::Matrix::identity(), getViewOffset(), false /*useMastersSceneData*/);
+        installCullVisitor(*camera);
+    
+        return camera;
+    }
+    virtual bool _updateImplementation(Viewer& viewer)
+    {
+        getCamera()->setViewMatrix(getEffectiveViewOffset(viewer));
+        getCamera()->setProjectionMatrix(getEffectiveFrustum(viewer).getMatrix(osg::Vec2(10, 8e4)));
+        return SlaveCamera::_updateImplementation(viewer);
+    }
+};
+
+Renderer::Renderer()
+{
+}
+
+Renderer::~Renderer()
+{
+}
+
+Drawable*
+Renderer::createDrawable(Viewer&, const std::string& name)
+{
+    return new Drawable(name);
+}
+
+SlaveCamera*
+Renderer::createSlaveCamera(Viewer&, const std::string& name)
+{
+    return new _SlaveCamera(name);
+}
+
+bool
+Renderer::realize(Viewer& viewer)
+{
+    if (!viewer.realizeDrawables())
+        return false;
+    return viewer.realizeSlaveCameras();
+}
+
+bool
+Renderer::update(Viewer& viewer)
+{
+    return viewer.updateSlaveCameras();
+}
+
+} // namespace fgviewer