source/graphics/display.cpp

   1 #include <iostream>
   2 #ifndef WIN32
   3 #include <X11/Xlib.h>
   4 #ifdef WITH_XF86VIDMODE
   5 #include <X11/extensions/xf86vmode.h>
   6 #endif
   7 #endif
   8 #include <msp/strings/format.h>
   9 #include <msp/strings/lexicalcast.h>
  10 #include "display.h"
  11 #include "window.h"
  12 #include "display_priv.h"
  13
  14 using namespace std;
  15
  16 namespace {
  17
  18 bool error_flag = false;
  19 std::string error_msg;
  20
  21 #ifndef WIN32
  22 int x_error_handler(Display *display, XErrorEvent *event)
  23 {
  24         char err[128];
  25         XGetErrorText(display, event->error_code, err, sizeof(err));
  26
  27         string request_code = Msp::lexical_cast<string, int>(event->request_code);
  28         char req[128];
  29         XGetErrorDatabaseText(display, "XRequest", request_code.c_str(), request_code.c_str(), req, sizeof(req));
  30
  31         string msg = Msp::format("Request %s failed with %s [%08X]", req, err, event->resourceid);
  32         if(error_flag)
  33                 cerr<<"Discarding error: "<<msg<<'\n';
  34         else
  35         {
  36                 cerr<<msg<<'\n';
  37                 error_msg = msg;
  38                 error_flag = true;
  39         }
  40
  41         return 0;
  42 }
  43 #endif
  44
  45 }
  46
  47 namespace Msp {
  48 namespace Graphics {
  49
  50 unsupported_video_mode::unsupported_video_mode(const VideoMode &mode):
  51         runtime_error(format("%dx%d", mode.width, mode.height))
  52 { }
  53
  54
  55 Display::Display(const string &disp_name):
  56         priv(new Private)
  57 {
  58 #ifdef WIN32
  59         (void)disp_name;
  60
  61         for(unsigned i=0;; ++i)
  62         {
  63                 DEVMODE info;
  64                 if(!EnumDisplaySettings(0, i, &info))
  65                         break;
  66
  67                 VideoMode mode(info.dmPelsWidth, info.dmPelsHeight);
  68                 mode.rate = info.dmDisplayFrequency;
  69                 modes.push_back(mode);
  70         }
  71
  72         DEVMODE info;
  73         if(EnumDisplaySettings(0, ENUM_CURRENT_SETTINGS, &info))
  74         {
  75                 orig_mode = VideoMode(info.dmPelsWidth, info.dmPelsHeight);
  76                 orig_mode.rate = info.dmDisplayFrequency;
  77         }
  78 #else
  79         if(disp_name.empty())
  80                 priv->display = XOpenDisplay(0);
  81         else
  82                 priv->display = XOpenDisplay(disp_name.c_str());
  83         if(!priv->display)
  84                 throw runtime_error("XOpenDisplay");
  85
  86         XSetErrorHandler(x_error_handler);
  87
  88 #ifdef WITH_XF86VIDMODE
  89         int screen = DefaultScreen(priv->display);
  90
  91         int nmodes;
  92         XF86VidModeModeInfo **infos;
  93         XF86VidModeGetAllModeLines(priv->display, screen, &nmodes, &infos);
  94         for(int i=0; i<nmodes; ++i)
  95         {
  96                 XF86VidModeModeInfo &info = *infos[i];
  97
  98                 VideoMode mode(info.hdisplay, info.vdisplay);
  99                 if(info.htotal && info.vtotal)
 100                         mode.rate = info.dotclock/(info.htotal*info.vtotal);
 101                 modes.push_back(mode);
 102         }
 103
 104         XFree(infos);
 105
 106         XF86VidModeModeLine modeline;
 107         int dotclock;
 108         XF86VidModeGetModeLine(priv->display, screen, &dotclock, &modeline);
 109         orig_mode = VideoMode(modeline.hdisplay, modeline.vdisplay);
 110         if(modeline.htotal && modeline.vtotal)
 111                 orig_mode.rate = dotclock/(modeline.htotal*modeline.vtotal);
 112 #endif
 113 #endif
 114 }
 115
 116 Display::~Display()
 117 {
 118 #ifndef WIN32
 119         XCloseDisplay(priv->display);
 120         delete priv;
 121 #endif
 122 }
 123
 124 void Display::add_window(Window &wnd)
 125 {
 126         priv->windows[wnd.get_private().window] = &wnd;
 127 }
 128
 129 void Display::remove_window(Window &wnd)
 130 {
 131         priv->windows.erase(wnd.get_private().window);
 132 }
 133
 134 void Display::set_mode(const VideoMode &mode)
 135 {
 136 #if defined(WIN32)
 137         DEVMODE info;
 138         info.dmSize = sizeof(DEVMODE);
 139         info.dmFields = DM_PELSWIDTH|DM_PELSHEIGHT;
 140         info.dmPelsWidth = mode.width;
 141         info.dmPelsHeight = mode.height;
 142         if(mode.rate)
 143         {
 144                 info.dmFields |= DM_DISPLAYFREQUENCY;
 145                 info.dmDisplayFrequency = mode.rate;
 146         }
 147
 148         LONG ret = ChangeDisplaySettings(&info, CDS_FULLSCREEN);
 149         if(ret!=DISP_CHANGE_SUCCESSFUL)
 150                 throw unsupported_video_mode(mode);
 151 #elif defined(WITH_XF86VIDMODE)
 152         int screen = DefaultScreen(priv->display);
 153
 154         int nmodes;
 155         XF86VidModeModeInfo **infos;
 156         XF86VidModeGetAllModeLines(priv->display, screen, &nmodes, &infos);
 157         for(int i=0; i<nmodes; ++i)
 158         {
 159                 XF86VidModeModeInfo &info = *infos[i];
 160
 161                 unsigned rate = 0;
 162                 if(info.htotal && info.vtotal)
 163                         rate = info.dotclock/(info.htotal*info.vtotal);
 164                 if(info.hdisplay==mode.width && info.vdisplay==mode.height && (mode.rate==0 || rate==mode.rate))
 165                 {
 166                         XF86VidModeSwitchToMode(priv->display, screen, &info);
 167                         XF86VidModeSetViewPort(priv->display, screen, 0, 0);
 168                         return;
 169                 }
 170         }
 171
 172         throw unsupported_video_mode(mode);
 173 #else
 174         (void)mode;
 175         throw runtime_error("no xf86vidmode support");
 176 #endif
 177 }
 178
 179 void Display::tick()
 180 {
 181         check_error();
 182
 183         while(1)
 184         {
 185 #ifdef WIN32
 186                 MSG msg;
 187                 if(PeekMessage(&msg, 0, 0, 0, PM_REMOVE))
 188                         DispatchMessage(&msg);
 189                 else
 190                         break;
 191 #else
 192                 int pending = XPending(priv->display);
 193                 if(pending==0)
 194                         break;
 195
 196                 for(; pending--;)
 197                 {
 198                         Window::Event event;
 199                         XNextEvent(priv->display, &event.xevent);
 200
 201                         check_error();
 202
 203                         map<WindowHandle, Window *>::iterator j = priv->windows.find(event.xevent.xany.window);
 204                         if(j!=priv->windows.end())
 205                         {
 206                                 /* Filter keyboard autorepeat.  If this packet is a KeyRelease and
 207                                 the next one is a KeyPress with the exact same parameters, they
 208                                 indicate autorepeat and must be dropped. */
 209                                 if(event.xevent.type==KeyRelease && !j->second->get_keyboard_autorepeat() && pending>0)
 210                                 {
 211                                         XKeyEvent &kev = event.xevent.xkey;
 212                                         XEvent ev2;
 213                                         XPeekEvent(priv->display, &ev2);
 214                                         if(ev2.type==KeyPress)
 215                                         {
 216                                                 XKeyEvent &kev2 = ev2.xkey;
 217                                                 if(kev2.window==kev.window && kev2.time==kev.time && kev2.keycode==kev.keycode)
 218                                                 {
 219                                                         XNextEvent(priv->display, &ev2);
 220                                                         --pending;
 221                                                         continue;
 222                                                 }
 223                                         }
 224                                 }
 225
 226                                 j->second->event(event);
 227                         }
 228                 }
 229 #endif
 230         }
 231 }
 232
 233 void Display::check_error()
 234 {
 235         if(error_flag)
 236         {
 237                 error_flag = false;
 238                 throw runtime_error(error_msg);
 239         }
 240 }
 241
 242 } // namespace Graphics
 243 } // namespace Msp