src/Main/WindowBuilder.cxx

   1 // Copyright (C) 2008  Tim Moore
   2 //
   3 // This program is free software; you can redistribute it and/or
   4 // modify it under the terms of the GNU General Public License as
   5 // published by the Free Software Foundation; either version 2 of the
   6 // License, or (at your option) any later version.
   7 //
   8 // This program is distributed in the hope that it will be useful, but
   9 // WITHOUT ANY WARRANTY; without even the implied warranty of
  10 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11 // General Public License for more details.
  12 //
  13 // You should have received a copy of the GNU General Public License
  14 // along with this program; if not, write to the Free Software
  15 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  16
  17 #include "WindowBuilder.hxx"
  18
  19 #include "WindowSystemAdapter.hxx"
  20 #include "fg_props.hxx"
  21
  22 #include <sstream>
  23
  24 using namespace std;
  25 using namespace osg;
  26
  27 namespace flightgear
  28 {
  29 string makeName(const string& prefix, int num)
  30 {
  31     stringstream stream;
  32     stream << prefix << num;
  33     return stream.str();
  34 }
  35
  36 ref_ptr<WindowBuilder> WindowBuilder::windowBuilder;
  37
  38 const string WindowBuilder::defaultWindowName("FlightGear");
  39
  40 void WindowBuilder::initWindowBuilder(bool stencil)
  41 {
  42     windowBuilder = new WindowBuilder(stencil);
  43 }
  44
  45 WindowBuilder::WindowBuilder(bool stencil) : defaultCounter(0)
  46 {
  47     defaultTraits = makeDefaultTraits(stencil);
  48 }
  49
  50 GraphicsContext::Traits*
  51 WindowBuilder::makeDefaultTraits(bool stencil)
  52 {
  53     GraphicsContext::WindowingSystemInterface* wsi
  54         = osg::GraphicsContext::getWindowingSystemInterface();
  55     GraphicsContext::Traits* traits = new osg::GraphicsContext::Traits;
  56
  57     traits->readDISPLAY();
  58     if (traits->displayNum < 0)
  59         traits->displayNum = 0;
  60     if (traits->screenNum < 0)
  61         traits->screenNum = 0;
  62
  63     int bpp = fgGetInt("/sim/rendering/bits-per-pixel");
  64     bool alpha = fgGetBool("/sim/rendering/clouds3d-enable");
  65     int cbits = (bpp <= 16) ?  5 :  8;
  66     int zbits = (bpp <= 16) ? 16 : 24;
  67     traits->red = traits->green = traits->blue = cbits;
  68     traits->depth = zbits;
  69     if (alpha)
  70         traits->alpha = 8;
  71
  72     if (stencil)
  73         traits->stencil = 8;
  74
  75     unsigned screenwidth = 0;
  76     unsigned screenheight = 0;
  77     wsi->getScreenResolution(*traits, screenwidth, screenheight);
  78
  79     traits->doubleBuffer = true;
  80     traits->mipMapGeneration = true;
  81     traits->windowName = "FlightGear";
  82     // XXX should check per window too.
  83     traits->sampleBuffers = fgGetBool("/sim/rendering/multi-sample-buffers", traits->sampleBuffers);
  84     traits->samples = fgGetInt("/sim/rendering/multi-samples", traits->samples);
  85     traits->vsync = fgGetBool("/sim/rendering/vsync-enable", traits->vsync);
  86     traits->windowDecoration = !fgGetBool("/sim/startup/fullscreen");
  87
  88     if (!traits->windowDecoration) {
  89         // fullscreen
  90         traits->supportsResize = false;
  91         traits->width = screenwidth;
  92         traits->height = screenheight;
  93     } else {
  94         // window
  95         int w = fgGetInt("/sim/startup/xsize");
  96         int h = fgGetInt("/sim/startup/ysize");
  97         traits->supportsResize = true;
  98         traits->width = w;
  99         traits->height = h;
 100         if ((w>0)&&(h>0))
 101         {
 102             traits->x = ((unsigned)w>screenwidth) ? 0 : (screenwidth-w)/3;
 103             traits->y = ((unsigned)h>screenheight) ? 0 : (screenheight-h)/3;
 104         }
 105     }
 106     return traits;
 107 }
 108 }
 109
 110 namespace
 111 {
 112 // Helper functions that set a value based on a property if it exists,
 113 // returning 1 if the value was set.
 114
 115 inline int setFromProperty(string& place, const SGPropertyNode* node,
 116                             const char* name)
 117 {
 118     const SGPropertyNode* valNode = node->getNode(name);
 119     if (valNode) {
 120         place = valNode->getStringValue();
 121         return 1;
 122     }
 123     return 0;
 124 }
 125
 126 inline int setFromProperty(int& place, const SGPropertyNode* node,
 127                             const char* name)
 128 {
 129     const SGPropertyNode* valNode = node->getNode(name);
 130     if (valNode) {
 131         place = valNode->getIntValue();
 132         return 1;
 133     }
 134     return 0;
 135 }
 136
 137 inline int setFromProperty(bool& place, const SGPropertyNode* node,
 138                             const char* name)
 139 {
 140     const SGPropertyNode* valNode = node->getNode(name);
 141     if (valNode) {
 142         place = valNode->getBoolValue();
 143         return 1;
 144     }
 145     return 0;
 146 }
 147 }
 148
 149 namespace flightgear
 150 {
 151 GraphicsWindow* WindowBuilder::buildWindow(const SGPropertyNode* winNode)
 152 {
 153     GraphicsContext::WindowingSystemInterface* wsi
 154         = osg::GraphicsContext::getWindowingSystemInterface();
 155     WindowSystemAdapter* wsa = WindowSystemAdapter::getWSA();
 156     string windowName;
 157     if (winNode->hasChild("window-name"))
 158         windowName = winNode->getStringValue("window-name");
 159     else if (winNode->hasChild("name"))
 160         windowName = winNode->getStringValue("name");
 161     GraphicsWindow* result = 0;
 162     if (!windowName.empty()) {
 163         result = wsa->findWindow(windowName);
 164         if (result)
 165             return result;
 166     }
 167     GraphicsContext::Traits* traits
 168         = new GraphicsContext::Traits(*defaultTraits);
 169     int traitsSet = setFromProperty(traits->hostName, winNode, "host-name");
 170     traitsSet |= setFromProperty(traits->displayNum, winNode, "display");
 171     traitsSet |= setFromProperty(traits->screenNum, winNode, "screen");
 172
 173     const SGPropertyNode* fullscreenNode = winNode->getNode("fullscreen");
 174
 175     if (fullscreenNode && fullscreenNode->getBoolValue()) {
 176         // fullscreen mode
 177         unsigned width = 0;
 178         unsigned height = 0;
 179         wsi->getScreenResolution(*traits, width, height);
 180         traits->windowDecoration = false;
 181         traits->width = width;
 182         traits->height = height;
 183         traits->supportsResize = false;
 184         traits->x = 0;
 185         traits->y = 0;
 186         traitsSet = 1;
 187     } else {
 188         int resizable = 0;
 189         if (fullscreenNode && !fullscreenNode->getBoolValue())
 190         {
 191             traits->windowDecoration = true;
 192             resizable = 1;
 193         }
 194         resizable |= setFromProperty(traits->windowDecoration, winNode,
 195                                      "decoration");
 196         resizable |= setFromProperty(traits->width, winNode, "width");
 197         resizable |= setFromProperty(traits->height, winNode, "height");
 198         if (resizable) {
 199             traits->supportsResize = true;
 200             traitsSet = 1;
 201         }
 202         // Otherwise use default values.
 203     }
 204     traitsSet |= setFromProperty(traits->x, winNode, "x");
 205     traitsSet |= setFromProperty(traits->y, winNode, "y");
 206     if (!windowName.empty() && windowName != traits->windowName) {
 207         traits->windowName = windowName;
 208         traitsSet = 1;
 209     } else if (traitsSet) {
 210         traits->windowName = makeName("FlightGear", defaultCounter++);
 211     }
 212     bool drawGUI = false;
 213     traitsSet |= setFromProperty(drawGUI, winNode, "gui");
 214     if (traitsSet) {
 215         GraphicsContext* gc = GraphicsContext::createGraphicsContext(traits);
 216         if (gc) {
 217             GraphicsWindow* window = WindowSystemAdapter::getWSA()
 218                 ->registerWindow(gc, traits->windowName);
 219             if (drawGUI)
 220                 window->flags |= GraphicsWindow::GUI;
 221             return window;
 222         } else {
 223             return 0;
 224         }
 225     } else {
 226         // XXX What if the window has no traits, but does have a name?
 227         // We should create a "default window" registered with that name.
 228         return getDefaultWindow();
 229     }
 230 }
 231
 232 GraphicsWindow* WindowBuilder::getDefaultWindow()
 233 {
 234     GraphicsWindow* defaultWindow
 235         = WindowSystemAdapter::getWSA()->findWindow(defaultWindowName);
 236     if (defaultWindow)
 237         return defaultWindow;
 238     GraphicsContext::Traits* traits
 239         = new GraphicsContext::Traits(*defaultTraits);
 240     traits->windowName = "FlightGear";
 241
 242     GraphicsContext* gc = GraphicsContext::createGraphicsContext(traits);
 243     if (gc) {
 244         defaultWindow = WindowSystemAdapter::getWSA()
 245             ->registerWindow(gc, defaultWindowName);
 246         return defaultWindow;
 247     } else {
 248         SG_LOG(SG_GENERAL, SG_ALERT, "getDefaultWindow: failed to create GraphicsContext");
 249         return 0;
 250     }
 251 }
 252 }