source/gbase/display.cpp

   1 /* $Id$
   2
   3 This file is part of libmspgbase
   4 Copyright © 2007-2008  Mikko Rasa, Mikkosoft Productions
   5 Distributed under the LGPL
   6 */
   7
   8 #include <iostream>
   9 #ifndef WIN32
  10 #include <X11/Xlib.h>
  11 #include <X11/extensions/xf86vmode.h>
  12 #endif
  13 #include <msp/core/except.h>
  14 #include <msp/strings/formatter.h>
  15 #include <msp/strings/lexicalcast.h>
  16 #include "display.h"
  17 #include "window.h"
  18 #include "display_priv.h"
  19
  20 using namespace std;
  21
  22 namespace {
  23
  24 bool error_flag=false;
  25 std::string error_msg;
  26
  27 #ifndef WIN32
  28 int x_error_handler(Display *display, XErrorEvent *event)
  29 {
  30         char err[128];
  31         XGetErrorText(display, event->error_code, err, sizeof(err));
  32
  33         string request_code=Msp::lexical_cast(static_cast<int>(event->request_code));
  34         char req[128];
  35         XGetErrorDatabaseText(display, "XRequest", request_code.c_str(), request_code.c_str(), req, sizeof(req));
  36
  37         string msg=Msp::format("Request %s failed with %s [%08X]", req, err, event->resourceid);
  38         if(error_flag)
  39                 cerr<<"Discarding error: "<<msg<<'\n';
  40         else
  41         {
  42                 cerr<<msg<<'\n';
  43                 error_msg=msg;
  44                 error_flag=true;
  45         }
  46
  47         return 0;
  48 }
  49 #endif
  50
  51 }
  52
  53 namespace Msp {
  54 namespace Graphics {
  55
  56 Display::Display(const string &disp_name):
  57         priv(new Private)
  58 {
  59 #ifdef WIN32
  60         (void)disp_name;
  61
  62         for(unsigned i=0;; ++i)
  63         {
  64                 DEVMODE info;
  65                 if(!EnumDisplaySettings(0, i, &info))
  66                         break;
  67
  68                 VideoMode mode(info.dmPelsWidth, info.dmPelsHeight);
  69                 mode.rate=info.dmDisplayFrequency;
  70                 modes.push_back(mode);
  71         }
  72
  73         DEVMODE info;
  74         if(EnumDisplaySettings(0, ENUM_CURRENT_SETTINGS, &info))
  75         {
  76                 orig_mode=VideoMode(info.dmPelsWidth, info.dmPelsHeight);
  77                 orig_mode.rate=info.dmDisplayFrequency;
  78         }
  79 #else
  80         if(disp_name.empty())
  81                 priv->display=XOpenDisplay(0);
  82         else
  83                 priv->display=XOpenDisplay(disp_name.c_str());
  84         if(!priv->display)
  85                 throw Exception("Couldn't open X display");
  86
  87         XSetErrorHandler(x_error_handler);
  88
  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 }
 114
 115 Display::~Display()
 116 {
 117 #ifndef WIN32
 118         XCloseDisplay(priv->display);
 119         delete priv;
 120 #endif
 121 }
 122
 123 void Display::add_window(Window &wnd)
 124 {
 125         priv->windows[wnd.get_private().window]=&wnd;
 126 }
 127
 128 void Display::remove_window(Window &wnd)
 129 {
 130         priv->windows.erase(wnd.get_private().window);
 131 }
 132
 133 void Display::set_mode(const VideoMode &mode)
 134 {
 135 #ifdef WIN32
 136         DEVMODE info;
 137         info.dmSize=sizeof(DEVMODE);
 138         info.dmFields=DM_PELSWIDTH|DM_PELSHEIGHT;
 139         info.dmPelsWidth=mode.width;
 140         info.dmPelsHeight=mode.height;
 141         if(mode.rate)
 142         {
 143                 info.dmFields|=DM_DISPLAYFREQUENCY;
 144                 info.dmDisplayFrequency=mode.rate;
 145         }
 146
 147         ChangeDisplaySettings(&info, CDS_FULLSCREEN);
 148 #else
 149         int screen=DefaultScreen(priv->display);
 150
 151         int nmodes;
 152         XF86VidModeModeInfo **infos;
 153         XF86VidModeGetAllModeLines(priv->display, screen, &nmodes, &infos);
 154         for(int i=0; i<nmodes; ++i)
 155         {
 156                 XF86VidModeModeInfo &info=*infos[i];
 157
 158                 unsigned rate=0;
 159                 if(info.htotal && info.vtotal)
 160                         rate=info.dotclock/(info.htotal*info.vtotal);
 161                 if(info.hdisplay==mode.width && info.vdisplay==mode.height && (mode.rate==0 || rate==mode.rate))
 162                 {
 163                         XF86VidModeSwitchToMode(priv->display, screen, &info);
 164                         XF86VidModeSetViewPort(priv->display, screen, 0, 0);
 165                         return;
 166                 }
 167         }
 168
 169         throw InvalidParameterValue("Requested mode not supported");
 170 #endif
 171 }
 172
 173 void Display::tick()
 174 {
 175         check_error();
 176
 177         while(1)
 178         {
 179 #ifdef WIN32
 180                 MSG msg;
 181                 if(PeekMessage(&msg, 0, 0, 0, PM_REMOVE))
 182                         DispatchMessage(&msg);
 183                 else
 184                         break;
 185 #else
 186                 int pending=XPending(priv->display);
 187                 if(pending==0)
 188                         break;
 189
 190                 for(; pending--;)
 191                 {
 192                         Window::Event event;
 193                         XNextEvent(priv->display, &event.xevent);
 194
 195                         check_error();
 196
 197                         map<WindowHandle, Window *>::iterator j=priv->windows.find(event.xevent.xany.window);
 198                         if(j!=priv->windows.end())
 199                         {
 200                                 /* Filter keyboard autorepeat.  If this packet is a KeyRelease and
 201                                 the next one is a KeyPress with the exact same parameters, they
 202                                 indicate autorepeat and must be dropped. */
 203                                 if(event.xevent.type==KeyRelease && !j->second->get_keyboard_autorepeat() && pending>0)
 204                                 {
 205                                         XKeyEvent &kev=event.xevent.xkey;
 206                                         XEvent ev2;
 207                                         XPeekEvent(priv->display, &ev2);
 208                                         if(ev2.type==KeyPress)
 209                                         {
 210                                                 XKeyEvent &kev2=ev2.xkey;
 211                                                 if(kev2.window==kev.window && kev2.time==kev.time && kev2.keycode==kev.keycode)
 212                                                 {
 213                                                         XNextEvent(priv->display, &ev2);
 214                                                         --pending;
 215                                                         continue;
 216                                                 }
 217                                         }
 218                                 }
 219
 220                                 j->second->event(event);
 221                         }
 222                 }
 223 #endif
 224         }
 225 }
 226
 227 void Display::check_error()
 228 {
 229         if(error_flag)
 230         {
 231                 error_flag=false;
 232                 throw Exception(error_msg);
 233         }
 234 }
 235
 236 } // namespace Graphics
 237 } // namespace Msp