src/Main/fg_os_osgviewer.cxx

   1 // fg_os_common.cxx -- common functions for fg_os interface
   2 // implemented as an osgViewer
   3 //
   4 // Copyright (C) 2007  Tim Moore timoore@redhat.com
   5 // Copyright (C) 2007 Mathias Froehlich
   6 //
   7 // This program is free software; you can redistribute it and/or
   8 // modify it under the terms of the GNU General Public License as
   9 // published by the Free Software Foundation; either version 2 of the
  10 // License, or (at your option) any later version.
  11 //
  12 // This program is distributed in the hope that it will be useful, but
  13 // WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15 // General Public License for more details.
  16 //
  17 // You should have received a copy of the GNU General Public License
  18 // along with this program; if not, write to the Free Software
  19 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  20
  21 #ifdef HAVE_CONFIG_H
  22 #  include <config.h>
  23 #endif
  24
  25 #include <stdlib.h>
  26
  27 #include <simgear/compiler.h>
  28 #include <simgear/structure/exception.hxx>
  29 #include <simgear/debug/logstream.hxx>
  30
  31 #include <osg/GraphicsContext>
  32 #include <osg/Group>
  33 #include <osg/Matrixd>
  34 #include <osg/Viewport>
  35 #include <osg/Version>
  36 #include <osg/View>
  37 #include <osgViewer/ViewerEventHandlers>
  38 #include <osgViewer/Viewer>
  39 #include <osgGA/MatrixManipulator>
  40
  41 #include <Include/general.hxx>
  42 #include <Scenery/scenery.hxx>
  43 #include "fg_os.hxx"
  44 #include "fg_props.hxx"
  45 #include "util.hxx"
  46 #include "globals.hxx"
  47 #include "renderer.hxx"
  48
  49 #if (FG_OSG_VERSION >= 19008)
  50 #define OSG_HAS_MOUSE_CURSOR_PATCH
  51 #endif
  52
  53 // fg_os implementation using OpenSceneGraph's osgViewer::Viewer class
  54 // to create the graphics window and run the event/update/render loop.
  55
  56 //
  57 // fg_os implementation
  58 //
  59
  60 using namespace osg;
  61
  62 static osg::ref_ptr<osgViewer::Viewer> viewer;
  63 static osg::ref_ptr<osg::Camera> mainCamera;
  64
  65 // Callback to prevent the GraphicsContext resized function from messing
  66 // with the projection matrix of the slave
  67
  68 namespace
  69 {
  70 struct fgResizeCallback : public GraphicsContext::ResizedCallback
  71 {
  72     fgResizeCallback(Camera* slaveCamera)
  73         : mainSlaveCamera(slaveCamera)
  74     {}
  75
  76     virtual void resizedImplementation(GraphicsContext* gc, int x, int y,
  77                                        int width, int height);
  78     ref_ptr<Camera> mainSlaveCamera;
  79 };
  80
  81 void fgResizeCallback::resizedImplementation(GraphicsContext* gc,
  82                                              int x, int y,
  83                                              int width, int height)
  84 {
  85     View* view = mainSlaveCamera->getView();
  86     View::Slave* slave = (view ?
  87                           view->findSlaveForCamera(mainSlaveCamera.get()) : 0);
  88     if (slave) {
  89         Matrixd projOffset(slave->_projectionOffset);
  90         gc->resizedImplementation(x, y, width, height);
  91         // Restore projection offsets changed by
  92         // GraphicsContext::resizedImplementation
  93         slave->_projectionOffset = projOffset;
  94     } else {
  95         gc->resizedImplementation(x, y, width, height);
  96     }
  97
  98 }
  99
 100 }
 101 void fgOSOpenWindow(int w, int h, int bpp,
 102                     bool alpha, bool stencil, bool fullscreen)
 103 {
 104     osg::GraphicsContext::WindowingSystemInterface* wsi;
 105     wsi = osg::GraphicsContext::getWindowingSystemInterface();
 106
 107     viewer = new osgViewer::Viewer;
 108     viewer->setDatabasePager(FGScenery::getPagerSingleton());
 109     std::string mode;
 110     mode = fgGetString("/sim/rendering/multithreading-mode", "SingleThreaded");
 111     if (mode == "AutomaticSelection")
 112       viewer->setThreadingModel(osgViewer::Viewer::AutomaticSelection);
 113     else if (mode == "CullDrawThreadPerContext")
 114       viewer->setThreadingModel(osgViewer::Viewer::CullDrawThreadPerContext);
 115     else if (mode == "DrawThreadPerContext")
 116       viewer->setThreadingModel(osgViewer::Viewer::DrawThreadPerContext);
 117     else if (mode == "CullThreadPerCameraDrawThreadPerContext")
 118       viewer->setThreadingModel(osgViewer::Viewer::CullThreadPerCameraDrawThreadPerContext);
 119     else
 120       viewer->setThreadingModel(osgViewer::Viewer::SingleThreaded);
 121     osg::ref_ptr<osg::GraphicsContext::Traits> traits;
 122     traits = new osg::GraphicsContext::Traits;
 123     traits->readDISPLAY();
 124     int cbits = (bpp <= 16) ?  5 :  8;
 125     int zbits = (bpp <= 16) ? 16 : 24;
 126     traits->red = traits->green = traits->blue = cbits;
 127     traits->depth = zbits;
 128     if (alpha)
 129         traits->alpha = 8;
 130     if (stencil)
 131         traits->stencil = 8;
 132     traits->doubleBuffer = true;
 133     traits->mipMapGeneration = true;
 134     traits->windowName = "FlightGear";
 135     traits->sampleBuffers = fgGetBool("/sim/rendering/multi-sample-buffers", traits->sampleBuffers);
 136     traits->samples = fgGetBool("/sim/rendering/multi-samples", traits->samples);
 137     traits->vsync = fgGetBool("/sim/rendering/vsync-enable", traits->vsync);
 138
 139     if (fullscreen) {
 140         unsigned width = 0;
 141         unsigned height = 0;
 142         wsi->getScreenResolution(*traits, width, height);
 143         traits->windowDecoration = false;
 144         traits->width = width;
 145         traits->height = height;
 146         traits->supportsResize = false;
 147     } else {
 148         traits->windowDecoration = true;
 149         traits->width = w;
 150         traits->height = h;
 151 #if defined(WIN32) || defined(__APPLE__)
 152         // Ugly Hack, why does CW_USEDEFAULT works like phase of the moon?
 153         // Mac also needs this to show window frame, menubar and Docks
 154         traits->x = 100;
 155         traits->y = 100;
 156 #endif
 157         traits->supportsResize = true;
 158     }
 159
 160     osg::Camera::ProjectionResizePolicy rsp = osg::Camera::VERTICAL;
 161
 162     // Ok, first the children.
 163     // that achieves some magic ordering og the slaves so that we end up
 164     // in the main window more often.
 165     // This can be sorted out better when we got rid of glut and sdl.
 166     FGManipulator* manipulator = globals->get_renderer()->getManipulator();
 167     int nCameras = 0;
 168     if (fgHasNode("/sim/rendering/camera")) {
 169       SGPropertyNode* renderingNode = fgGetNode("/sim/rendering");
 170       for (int i = 0; i < renderingNode->nChildren(); ++i) {
 171         SGPropertyNode* cameraNode = renderingNode->getChild(i);
 172         if (strcmp(cameraNode->getName(), "camera") != 0)
 173           continue;
 174
 175         nCameras++;
 176         // get a new copy of the traits struct
 177         osg::ref_ptr<osg::GraphicsContext::Traits> cameraTraits;
 178         cameraTraits = new osg::GraphicsContext::Traits(*traits);
 179
 180         double shearx = cameraNode->getDoubleValue("shear-x", 0);
 181         double sheary = cameraNode->getDoubleValue("shear-y", 0);
 182         cameraTraits->hostName
 183           = cameraNode->getStringValue("host-name", traits->hostName.c_str());
 184         cameraTraits->displayNum
 185           = cameraNode->getIntValue("display", traits->displayNum);
 186         cameraTraits->screenNum
 187           = cameraNode->getIntValue("screen", traits->screenNum);
 188         if (cameraNode->getBoolValue("fullscreen", fullscreen)) {
 189           unsigned width = 0;
 190           unsigned height = 0;
 191           wsi->getScreenResolution(*cameraTraits, width, height);
 192           cameraTraits->windowDecoration = false;
 193           cameraTraits->width = width;
 194           cameraTraits->height = height;
 195           cameraTraits->supportsResize = false;
 196         } else {
 197           cameraTraits->windowDecoration = true;
 198           cameraTraits->width = cameraNode->getIntValue("width", w);
 199           cameraTraits->height = cameraNode->getIntValue("height", h);
 200           cameraTraits->supportsResize = true;
 201         }
 202         // FIXME, currently this is too much of a problem to route the resize
 203         // events. When we do no longer need sdl and such this
 204         // can be simplified
 205         cameraTraits->supportsResize = false;
 206
 207         // ok found a camera configuration, add a new slave ...
 208         osg::ref_ptr<osg::Camera> camera = new osg::Camera;
 209
 210         osg::GraphicsContext* gc;
 211         gc = osg::GraphicsContext::createGraphicsContext(cameraTraits.get());
 212         gc->realize();
 213         camera->setGraphicsContext(gc);
 214         // If a viewport isn't set on the camera, then it's hard to dig it
 215         // out of the SceneView objects in the viewer, and the coordinates
 216         // of mouse events are somewhat bizzare.
 217         camera->setViewport(new osg::Viewport(0, 0, cameraTraits->width, cameraTraits->height));
 218         camera->setProjectionResizePolicy(rsp);
 219         viewer->addSlave(camera.get(), osg::Matrix::translate(-shearx, -sheary, 0), osg::Matrix());
 220       }
 221       if (nCameras > 1)
 222         manipulator->setResizable(false);
 223     }
 224
 225     // now the main camera ...
 226     osg::ref_ptr<osg::Camera> camera = new osg::Camera;
 227     mainCamera = camera;
 228     osg::GraphicsContext* gc;
 229     gc = osg::GraphicsContext::createGraphicsContext(traits.get());
 230     gc->realize();
 231     gc->makeCurrent();
 232     camera->setGraphicsContext(gc);
 233     // If a viewport isn't set on the camera, then it's hard to dig it
 234     // out of the SceneView objects in the viewer, and the coordinates
 235     // of mouse events are somewhat bizzare.
 236     camera->setViewport(new osg::Viewport(0, 0, traits->width, traits->height));
 237     camera->setProjectionResizePolicy(rsp);
 238     if (nCameras == 0) {
 239         // Only one principal camera
 240         gc->setResizedCallback(new fgResizeCallback(camera.get()));
 241     }
 242     // Why a slave? It seems to be the easiest way to assign cameras,
 243     // for which we've created the graphics context ourselves, to the viewer.
 244     viewer->addSlave(camera.get());
 245
 246     viewer->setCameraManipulator(globals->get_renderer()->getManipulator());
 247     // Let FG handle the escape key with a confirmation
 248     viewer->setKeyEventSetsDone(0);
 249     osgViewer::StatsHandler* statsHandler = new osgViewer::StatsHandler;
 250     statsHandler->setKeyEventTogglesOnScreenStats('*');
 251     statsHandler->setKeyEventPrintsOutStats(0);
 252     viewer->addEventHandler(statsHandler);
 253     // The viewer won't start without some root.
 254     viewer->setSceneData(new osg::Group);
 255     globals->get_renderer()->setViewer(viewer.get());
 256 }
 257
 258 static int status = 0;
 259
 260 void fgOSExit(int code)
 261 {
 262     viewer->setDone(true);
 263     status = code;
 264 }
 265
 266 void fgOSMainLoop()
 267 {
 268     viewer->run();
 269     fgExit(status);
 270 }
 271
 272 int fgGetKeyModifiers()
 273 {
 274     return globals->get_renderer()->getManipulator()->getCurrentModifiers();
 275 }
 276
 277 void fgWarpMouse(int x, int y)
 278 {
 279     globals->get_renderer()->getManipulator()->setMouseWarped();
 280     // Hack, currently the pointer is just recentered. So, we know the
 281     // relative coordinates ...
 282     if (!mainCamera.valid()) {
 283         viewer->requestWarpPointer(0, 0);
 284         return;
 285     }
 286     float xsize = (float)mainCamera->getGraphicsContext()->getTraits()->width;
 287     float ysize = (float)mainCamera->getGraphicsContext()->getTraits()->height;
 288     viewer->requestWarpPointer(2.0f * (float)x / xsize - 1.0f,
 289                                1.0f - 2.0f * (float)y / ysize);
 290 }
 291
 292 // Noop
 293 void fgOSInit(int* argc, char** argv)
 294 {
 295 }
 296
 297 // Noop
 298 void fgOSFullScreen()
 299 {
 300 }
 301
 302 #ifdef OSG_HAS_MOUSE_CURSOR_PATCH
 303 static void setMouseCursor(osg::Camera* camera, int cursor)
 304 {
 305     if (!camera)
 306         return;
 307     osg::GraphicsContext* gc = camera->getGraphicsContext();
 308     if (!gc)
 309         return;
 310     osgViewer::GraphicsWindow* gw;
 311     gw = dynamic_cast<osgViewer::GraphicsWindow*>(gc);
 312     if (!gw)
 313         return;
 314
 315     osgViewer::GraphicsWindow::MouseCursor mouseCursor;
 316     mouseCursor = osgViewer::GraphicsWindow::InheritCursor;
 317     if     (cursor == MOUSE_CURSOR_NONE)
 318         mouseCursor = osgViewer::GraphicsWindow::NoCursor;
 319     else if(cursor == MOUSE_CURSOR_POINTER)
 320         mouseCursor = osgViewer::GraphicsWindow::RightArrowCursor;
 321     else if(cursor == MOUSE_CURSOR_WAIT)
 322         mouseCursor = osgViewer::GraphicsWindow::WaitCursor;
 323     else if(cursor == MOUSE_CURSOR_CROSSHAIR)
 324         mouseCursor = osgViewer::GraphicsWindow::CrosshairCursor;
 325     else if(cursor == MOUSE_CURSOR_LEFTRIGHT)
 326         mouseCursor = osgViewer::GraphicsWindow::LeftRightCursor;
 327
 328     gw->setCursor(mouseCursor);
 329 }
 330 #endif
 331
 332 static int _cursor = -1;
 333
 334 void fgSetMouseCursor(int cursor)
 335 {
 336     _cursor = cursor;
 337 #ifdef OSG_HAS_MOUSE_CURSOR_PATCH
 338     setMouseCursor(viewer->getCamera(), cursor);
 339     for (unsigned i = 0; i < viewer->getNumSlaves(); ++i)
 340         setMouseCursor(viewer->getSlave(i)._camera.get(), cursor);
 341 #endif
 342 }
 343
 344 int fgGetMouseCursor()
 345 {
 346     return _cursor;
 347 }
 348
 349 void fgMakeCurrent()
 350 {
 351     if (!mainCamera.valid())
 352         return;
 353     osg::GraphicsContext* gc = mainCamera->getGraphicsContext();
 354     if (!gc)
 355         return;
 356     gc->makeCurrent();
 357 }
 358
 359 bool fgOSIsMainContext(const osg::GraphicsContext* context)
 360 {
 361     if (!mainCamera.valid())
 362         return false;
 363     return context == mainCamera->getGraphicsContext();
 364 }
 365
 366 bool fgOSIsMainCamera(const osg::Camera* camera)
 367 {
 368   if (!camera)
 369     return false;
 370   if (camera == mainCamera.get())
 371     return true;
 372   if (!viewer.valid())
 373     return false;
 374   if (camera == viewer->getCamera())
 375     return true;
 376   return false;
 377 }