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 <algorithm>
  26 #include <iostream>
  27 #include <sstream>
  28 #include <string>
  29
  30 #include <stdlib.h>
  31
  32 #include <simgear/compiler.h>
  33 #include <simgear/structure/exception.hxx>
  34 #include <simgear/debug/logstream.hxx>
  35
  36 #include <osg/GraphicsContext>
  37 #include <osg/Group>
  38 #include <osg/Matrixd>
  39 #include <osg/Viewport>
  40 #include <osg/Version>
  41 #include <osg/View>
  42 #include <osgViewer/ViewerEventHandlers>
  43 #include <osgViewer/Viewer>
  44 #include <osgGA/MatrixManipulator>
  45
  46 #include <Include/general.hxx>
  47 #include <Scenery/scenery.hxx>
  48 #include "fg_os.hxx"
  49 #include "fg_props.hxx"
  50 #include "util.hxx"
  51 #include "globals.hxx"
  52 #include "renderer.hxx"
  53 #include "WindowSystemAdapter.hxx"
  54
  55 #if (FG_OSG_VERSION >= 19008)
  56 #define OSG_HAS_MOUSE_CURSOR_PATCH
  57 #endif
  58
  59 // fg_os implementation using OpenSceneGraph's osgViewer::Viewer class
  60 // to create the graphics window and run the event/update/render loop.
  61
  62 //
  63 // fg_os implementation
  64 //
  65
  66 using namespace std;
  67 using namespace flightgear;
  68 using namespace osg;
  69
  70
  71
  72 static osg::ref_ptr<osgViewer::Viewer> viewer;
  73 static osg::ref_ptr<osg::Camera> mainCamera;
  74
  75 // Callback to prevent the GraphicsContext resized function from messing
  76 // with the projection matrix of the slave
  77
  78 namespace
  79 {
  80 // silly function for making the default window and camera names
  81 std::string makeName(const string& prefix, int num)
  82 {
  83     std::stringstream stream;
  84     stream << prefix << num;
  85     return stream.str();
  86 }
  87
  88 GraphicsContext::Traits*
  89 makeDefaultTraits(GraphicsContext::WindowingSystemInterface* wsi, bool stencil)
  90 {
  91     int w = fgGetInt("/sim/startup/xsize");
  92     int h = fgGetInt("/sim/startup/ysize");
  93     int bpp = fgGetInt("/sim/rendering/bits-per-pixel");
  94     bool alpha = fgGetBool("/sim/rendering/clouds3d-enable");
  95     bool fullscreen = fgGetBool("/sim/startup/fullscreen");
  96
  97     GraphicsContext::Traits* traits = new osg::GraphicsContext::Traits;
  98     traits->readDISPLAY();
  99     int cbits = (bpp <= 16) ?  5 :  8;
 100     int zbits = (bpp <= 16) ? 16 : 24;
 101     traits->red = traits->green = traits->blue = cbits;
 102     traits->depth = zbits;
 103     if (alpha)
 104         traits->alpha = 8;
 105     if (stencil)
 106         traits->stencil = 8;
 107     traits->doubleBuffer = true;
 108     traits->mipMapGeneration = true;
 109     traits->windowName = "FlightGear";
 110     // XXX should check per window too.
 111     traits->sampleBuffers = fgGetBool("/sim/rendering/multi-sample-buffers", traits->sampleBuffers);
 112     traits->samples = fgGetBool("/sim/rendering/multi-samples", traits->samples);
 113     traits->vsync = fgGetBool("/sim/rendering/vsync-enable", traits->vsync);
 114     if (fullscreen) {
 115         unsigned width = 0;
 116         unsigned height = 0;
 117         wsi->getScreenResolution(*traits, width, height);
 118         traits->windowDecoration = false;
 119         traits->width = width;
 120         traits->height = height;
 121         traits->supportsResize = false;
 122     } else {
 123         traits->windowDecoration = true;
 124         traits->width = w;
 125         traits->height = h;
 126 #if defined(WIN32) || defined(__APPLE__)
 127         // Ugly Hack, why does CW_USEDEFAULT works like phase of the moon?
 128         // Mac also needs this to show window frame, menubar and Docks
 129         traits->x = 100;
 130         traits->y = 100;
 131 #endif
 132         traits->supportsResize = true;
 133     }
 134     return traits;
 135 }
 136
 137 void setTraitsFromProperties(GraphicsContext::Traits* traits,
 138                              const SGPropertyNode* winNode,
 139                              GraphicsContext::WindowingSystemInterface* wsi)
 140 {
 141     traits->hostName
 142         = winNode->getStringValue("host-name", traits->hostName.c_str());
 143     traits->displayNum = winNode->getIntValue("display", traits->displayNum);
 144     traits->screenNum = winNode->getIntValue("screen", traits->screenNum);
 145     if (winNode->getBoolValue("fullscreen",
 146                               fgGetBool("/sim/startup/fullscreen"))) {
 147         unsigned width = 0;
 148         unsigned height = 0;
 149         wsi->getScreenResolution(*traits, width, height);
 150         traits->windowDecoration = false;
 151         traits->width = width;
 152         traits->height = height;
 153         traits->supportsResize = false;
 154     } else {
 155         traits->windowDecoration = winNode->getBoolValue("decoration", true);
 156         traits->width = winNode->getIntValue("width", traits->width);
 157         traits->height = winNode->getIntValue("height", traits->height);
 158         traits->supportsResize = true;
 159     }
 160     traits->x = winNode->getIntValue("x", traits->x);
 161     traits->y = winNode->getIntValue("y", traits->y);
 162     if (winNode->hasChild("window-name"))
 163         traits->windowName = winNode->getStringValue("window-name");
 164     else if (winNode->hasChild("name"))
 165         traits->windowName = winNode->getStringValue("name");
 166 }
 167
 168 } //namespace
 169
 170 void fgOSOpenWindow(bool stencil)
 171 {
 172     osg::GraphicsContext::WindowingSystemInterface* wsi;
 173     wsi = osg::GraphicsContext::getWindowingSystemInterface();
 174
 175     viewer = new osgViewer::Viewer;
 176     viewer->setDatabasePager(FGScenery::getPagerSingleton());
 177     std::string mode;
 178     mode = fgGetString("/sim/rendering/multithreading-mode", "SingleThreaded");
 179     if (mode == "AutomaticSelection")
 180       viewer->setThreadingModel(osgViewer::Viewer::AutomaticSelection);
 181     else if (mode == "CullDrawThreadPerContext")
 182       viewer->setThreadingModel(osgViewer::Viewer::CullDrawThreadPerContext);
 183     else if (mode == "DrawThreadPerContext")
 184       viewer->setThreadingModel(osgViewer::Viewer::DrawThreadPerContext);
 185     else if (mode == "CullThreadPerCameraDrawThreadPerContext")
 186       viewer->setThreadingModel(osgViewer::Viewer::CullThreadPerCameraDrawThreadPerContext);
 187     else
 188       viewer->setThreadingModel(osgViewer::Viewer::SingleThreaded);
 189     osg::ref_ptr<osg::GraphicsContext::Traits> traits
 190         = makeDefaultTraits(wsi, stencil);
 191
 192     // Ok, first the children.
 193     // that achieves some magic ordering og the slaves so that we end up
 194     // in the main window more often.
 195     // This can be sorted out better when we got rid of glut and sdl.
 196     FGManipulator* manipulator = globals->get_renderer()->getManipulator();
 197     string defaultName("slave");
 198     WindowSystemAdapter* wsa = WindowSystemAdapter::getWSA();
 199     if (fgHasNode("/sim/rendering/camera")) {
 200         SGPropertyNode* renderingNode = fgGetNode("/sim/rendering");
 201         for (int i = 0; i < renderingNode->nChildren(); ++i) {
 202             SGPropertyNode* cameraNode = renderingNode->getChild(i);
 203             if (strcmp(cameraNode->getName(), "camera") != 0)
 204                 continue;
 205
 206             // get a new copy of the traits struct
 207             osg::ref_ptr<osg::GraphicsContext::Traits> cameraTraits;
 208             cameraTraits = new osg::GraphicsContext::Traits(*traits);
 209             double shearx = cameraNode->getDoubleValue("shear-x", 0);
 210             double sheary = cameraNode->getDoubleValue("shear-y", 0);
 211             setTraitsFromProperties(cameraTraits.get(), cameraNode, wsi);
 212             // FIXME, currently this is too much of a problem to route
 213             // the resize events. When we do no longer need sdl and
 214             // such this can be simplified
 215             cameraTraits->supportsResize = false;
 216
 217             // ok found a camera configuration, add a new slave if possible
 218             GraphicsContext* gc
 219                 = GraphicsContext::createGraphicsContext(cameraTraits.get());
 220             if (gc) {
 221                 gc->realize();
 222                 Camera *camera = new Camera;
 223                 camera->setGraphicsContext(gc);
 224                 // If a viewport isn't set on the camera, then it's
 225                 // hard to dig it out of the SceneView objects in the
 226                 // viewer, and the coordinates of mouse events are
 227                 // somewhat bizzare.
 228                 camera->setViewport(new Viewport(0, 0, cameraTraits->width,
 229                                                  cameraTraits->height));
 230                 const char* cameraName = cameraNode->getStringValue("name");
 231                 string cameraNameString = (cameraName ? string(cameraName)
 232                                            : makeName(defaultName, i));
 233                 GraphicsWindow* window = wsa->registerWindow(gc,
 234                                                              cameraNameString);
 235                 Camera3D* cam3D = wsa->registerCamera3D(window, camera,
 236                                                         cameraNameString);
 237                 if (shearx == 0 && sheary == 0)
 238                     cam3D->flags |= Camera3D::MASTER;
 239                 viewer->addSlave(camera, Matrix::translate(-shearx, -sheary, 0),
 240                                  Matrix());
 241             } else {
 242                 SG_LOG(SG_GENERAL, SG_WARN,
 243                        "Couldn't create graphics context on "
 244                        << cameraTraits->hostName << ":"
 245                        << cameraTraits->displayNum
 246                        << "." << cameraTraits->screenNum);
 247             }
 248         }
 249     }
 250     // now the main camera ...
 251     // XXX mainCamera's purpose is to establish a "main graphics
 252     // context" that can be made current (if necessary). But that
 253     // should be a context established with a window. It's used to
 254     // choose whether to render the GUI and panel camera nodes, but
 255     // that's obsolete because the GUI is rendered in its own
 256     // slave. And it's used to translate mouse event coordinates, but
 257     // that's bogus because mouse clicks should work on any camera. In
 258     // short, mainCamera must die :)
 259     Camera3DVector::iterator citr
 260         = find_if(wsa->cameras.begin(), wsa->cameras.end(),
 261                   WindowSystemAdapter::FlagTester<Camera3D>(Camera3D::MASTER));
 262     if (citr == wsa->cameras.end()) {
 263         // Create a camera aligned with the master camera. Eventually
 264         // this will be optional.
 265         Camera* camera = new osg::Camera;
 266         mainCamera = camera;
 267         osg::GraphicsContext* gc
 268             = osg::GraphicsContext::createGraphicsContext(traits.get());
 269         gc->realize();
 270         gc->makeCurrent();
 271         camera->setGraphicsContext(gc);
 272         // If a viewport isn't set on the camera, then it's hard to dig it
 273         // out of the SceneView objects in the viewer, and the coordinates
 274         // of mouse events are somewhat bizzare.
 275         camera->setViewport(new osg::Viewport(0, 0,
 276                                               traits->width, traits->height));
 277         GraphicsWindow* window = wsa->registerWindow(gc, string("main"));
 278         window->flags |= GraphicsWindow::GUI;
 279         Camera3D* camera3d = wsa->registerCamera3D(window, camera,
 280                                                    string("main"));
 281         camera3d->flags |= Camera3D::MASTER;
 282         // Why a slave? It seems to be the easiest way to assign cameras,
 283         // for which we've created the graphics context ourselves, to
 284         // the viewer.
 285         viewer->addSlave(camera);
 286     } else {
 287         mainCamera = (*citr)->camera;
 288     }
 289     if (wsa->cameras.size() != 1) {
 290         manipulator->setResizable(false);
 291     }
 292     viewer->getCamera()->setProjectionResizePolicy(osg::Camera::FIXED);
 293     viewer->setCameraManipulator(manipulator);
 294     // Let FG handle the escape key with a confirmation
 295     viewer->setKeyEventSetsDone(0);
 296     // The viewer won't start without some root.
 297     viewer->setSceneData(new osg::Group);
 298     globals->get_renderer()->setViewer(viewer.get());
 299 }
 300
 301 static int status = 0;
 302
 303 void fgOSExit(int code)
 304 {
 305     viewer->setDone(true);
 306     viewer->getDatabasePager()->cancel();
 307     status = code;
 308 }
 309
 310 void fgOSMainLoop()
 311 {
 312     viewer->run();
 313     fgExit(status);
 314 }
 315
 316 int fgGetKeyModifiers()
 317 {
 318     return globals->get_renderer()->getManipulator()->getCurrentModifiers();
 319 }
 320
 321 void fgWarpMouse(int x, int y)
 322 {
 323     globals->get_renderer()->getManipulator()->setMouseWarped();
 324     // Hack, currently the pointer is just recentered. So, we know the
 325     // relative coordinates ...
 326     if (!mainCamera.valid()) {
 327         viewer->requestWarpPointer(0, 0);
 328         return;
 329     }
 330     float xsize = (float)mainCamera->getGraphicsContext()->getTraits()->width;
 331     float ysize = (float)mainCamera->getGraphicsContext()->getTraits()->height;
 332     viewer->requestWarpPointer(2.0f * (float)x / xsize - 1.0f,
 333                                1.0f - 2.0f * (float)y / ysize);
 334 }
 335
 336 void fgOSInit(int* argc, char** argv)
 337 {
 338     WindowSystemAdapter::setWSA(new WindowSystemAdapter);
 339 }
 340
 341 // Noop
 342 void fgOSFullScreen()
 343 {
 344 }
 345
 346 #ifdef OSG_HAS_MOUSE_CURSOR_PATCH
 347 static void setMouseCursor(osg::Camera* camera, int cursor)
 348 {
 349     if (!camera)
 350         return;
 351     osg::GraphicsContext* gc = camera->getGraphicsContext();
 352     if (!gc)
 353         return;
 354     osgViewer::GraphicsWindow* gw;
 355     gw = dynamic_cast<osgViewer::GraphicsWindow*>(gc);
 356     if (!gw)
 357         return;
 358
 359     osgViewer::GraphicsWindow::MouseCursor mouseCursor;
 360     mouseCursor = osgViewer::GraphicsWindow::InheritCursor;
 361     if     (cursor == MOUSE_CURSOR_NONE)
 362         mouseCursor = osgViewer::GraphicsWindow::NoCursor;
 363     else if(cursor == MOUSE_CURSOR_POINTER)
 364         mouseCursor = osgViewer::GraphicsWindow::RightArrowCursor;
 365     else if(cursor == MOUSE_CURSOR_WAIT)
 366         mouseCursor = osgViewer::GraphicsWindow::WaitCursor;
 367     else if(cursor == MOUSE_CURSOR_CROSSHAIR)
 368         mouseCursor = osgViewer::GraphicsWindow::CrosshairCursor;
 369     else if(cursor == MOUSE_CURSOR_LEFTRIGHT)
 370         mouseCursor = osgViewer::GraphicsWindow::LeftRightCursor;
 371
 372     gw->setCursor(mouseCursor);
 373 }
 374 #endif
 375
 376 static int _cursor = -1;
 377
 378 void fgSetMouseCursor(int cursor)
 379 {
 380     _cursor = cursor;
 381 #ifdef OSG_HAS_MOUSE_CURSOR_PATCH
 382     setMouseCursor(viewer->getCamera(), cursor);
 383     for (unsigned i = 0; i < viewer->getNumSlaves(); ++i)
 384         setMouseCursor(viewer->getSlave(i)._camera.get(), cursor);
 385 #endif
 386 }
 387
 388 int fgGetMouseCursor()
 389 {
 390     return _cursor;
 391 }
 392
 393 bool fgOSIsMainContext(const osg::GraphicsContext* context)
 394 {
 395     if (!mainCamera.valid())
 396         return false;
 397     return context == mainCamera->getGraphicsContext();
 398 }
 399
 400 bool fgOSIsMainCamera(const osg::Camera* camera)
 401 {
 402   if (!camera)
 403     return false;
 404   if (camera == mainCamera.get())
 405     return true;
 406   if (!viewer.valid())
 407     return false;
 408   if (camera == viewer->getCamera())
 409     return true;
 410   return false;
 411 }
 412
 413 GraphicsContext* fgOSGetMainContext()
 414 {
 415     WindowSystemAdapter* wsa = WindowSystemAdapter::getWSA();
 416     WindowVector::iterator contextIter
 417         = std::find_if(wsa->windows.begin(), wsa->windows.end(),
 418                        WindowSystemAdapter::FlagTester<GraphicsWindow>(GraphicsWindow::GUI));
 419     if (contextIter == wsa->windows.end())
 420         return 0;
 421     else
 422         return (*contextIter)->gc.get();
 423 }
 424