src/supertux/screen_manager.cpp

   1 //  SuperTux
   2 //  Copyright (C) 2006 Matthias Braun <matze@braunis.de>
   3 //
   4 //  This program is free software: you can redistribute it and/or modify
   5 //  it under the terms of the GNU General Public License as published by
   6 //  the Free Software Foundation, either version 3 of the License, or
   7 //  (at your option) any later version.
   8 //
   9 //  This program is distributed in the hope that it will be useful,
  10 //  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 //  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 //  GNU General Public License for more details.
  13 //
  14 //  You should have received a copy of the GNU General Public License
  15 //  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16
  17 #include "supertux/screen_manager.hpp"
  18
  19 #include "audio/sound_manager.hpp"
  20 #include "control/joystickkeyboardcontroller.hpp"
  21 #include "gui/menu.hpp"
  22 #include "gui/menu_manager.hpp"
  23 #include "scripting/squirrel_util.hpp"
  24 #include "scripting/time_scheduler.hpp"
  25 #include "supertux/constants.hpp"
  26 #include "supertux/console.hpp"
  27 #include "supertux/gameconfig.hpp"
  28 #include "supertux/globals.hpp"
  29 #include "supertux/main.hpp"
  30 #include "supertux/player_status.hpp"
  31 #include "supertux/resources.hpp"
  32 #include "supertux/screen_fade.hpp"
  33 #include "supertux/screen.hpp"
  34 #include "supertux/timer.hpp"
  35 #include "video/drawing_context.hpp"
  36 #include "video/renderer.hpp"
  37
  38 /** ticks (as returned from SDL_GetTicks) per frame */
  39 static const Uint32 TICKS_PER_FRAME = (Uint32) (1000.0 / LOGICAL_FPS);
  40 /** don't skip more than every 2nd frame */
  41 static const int MAX_FRAME_SKIP = 2;
  42
  43 ScreenManager::ScreenManager() :
  44   waiting_threads(),
  45   running(),
  46   speed(1.0),
  47   nextpop(false),
  48   nextpush(false),
  49   fps(0),
  50   next_screen(),
  51   current_screen(),
  52   console(),
  53   screen_fade(),
  54   screen_stack(),
  55   screenshot_requested(false)
  56 {
  57   using namespace Scripting;
  58   TimeScheduler::instance = new TimeScheduler();
  59 }
  60
  61 ScreenManager::~ScreenManager()
  62 {
  63   using namespace Scripting;
  64   delete TimeScheduler::instance;
  65   TimeScheduler::instance = NULL;
  66
  67   for(std::vector<Screen*>::iterator i = screen_stack.begin();
  68       i != screen_stack.end(); ++i) {
  69     delete *i;
  70   }
  71 }
  72
  73 void
  74 ScreenManager::push_screen(Screen* screen, ScreenFade* screen_fade)
  75 {
  76   this->next_screen.reset(screen);
  77   this->screen_fade.reset(screen_fade);
  78   nextpush = !nextpop;
  79   nextpop = false;
  80   speed = 1.0f;
  81 }
  82
  83 void
  84 ScreenManager::exit_screen(ScreenFade* screen_fade)
  85 {
  86   next_screen.reset(NULL);
  87   this->screen_fade.reset(screen_fade);
  88   nextpop = true;
  89   nextpush = false;
  90 }
  91
  92 void
  93 ScreenManager::set_screen_fade(ScreenFade* screen_fade)
  94 {
  95   this->screen_fade.reset(screen_fade);
  96 }
  97
  98 void
  99 ScreenManager::quit(ScreenFade* screen_fade)
 100 {
 101   for(std::vector<Screen*>::iterator i = screen_stack.begin();
 102       i != screen_stack.end(); ++i)
 103     delete *i;
 104   screen_stack.clear();
 105
 106   exit_screen(screen_fade);
 107 }
 108
 109 void
 110 ScreenManager::set_speed(float speed)
 111 {
 112   this->speed = speed;
 113 }
 114
 115 float
 116 ScreenManager::get_speed() const
 117 {
 118   return speed;
 119 }
 120
 121 bool
 122 ScreenManager::has_no_pending_fadeout() const
 123 {
 124   return screen_fade.get() == NULL || screen_fade->done();
 125 }
 126
 127 void
 128 ScreenManager::draw_fps(DrawingContext& context, float fps_fps)
 129 {
 130   char str[60];
 131   snprintf(str, sizeof(str), "%3.1f", fps_fps);
 132   const char* fpstext = "FPS";
 133   context.draw_text(Resources::small_font, fpstext,
 134                     Vector(SCREEN_WIDTH - Resources::small_font->get_text_width(fpstext) - Resources::small_font->get_text_width(" 99999") - BORDER_X,
 135                            BORDER_Y + 20), ALIGN_LEFT, LAYER_HUD);
 136   context.draw_text(Resources::small_font, str, Vector(SCREEN_WIDTH - BORDER_X, BORDER_Y + 20), ALIGN_RIGHT, LAYER_HUD);
 137 }
 138
 139 void
 140 ScreenManager::draw(DrawingContext& context)
 141 {
 142   static Uint32 fps_ticks = SDL_GetTicks();
 143   static int frame_count = 0;
 144
 145   current_screen->draw(context);
 146   if(MenuManager::current() != NULL)
 147     MenuManager::current()->draw(context);
 148   if(screen_fade.get() != NULL)
 149     screen_fade->draw(context);
 150   Console::instance->draw(context);
 151
 152   if(g_config->show_fps)
 153     draw_fps(context, fps);
 154
 155   // if a screenshot was requested, pass request on to drawing_context
 156   if (screenshot_requested) {
 157     context.take_screenshot();
 158     screenshot_requested = false;
 159   }
 160   context.do_drawing();
 161
 162   /* Calculate frames per second */
 163   if(g_config->show_fps)
 164   {
 165     ++frame_count;
 166
 167     if(SDL_GetTicks() - fps_ticks >= 500)
 168     {
 169       fps = (float) frame_count / .5;
 170       frame_count = 0;
 171       fps_ticks = SDL_GetTicks();
 172     }
 173   }
 174 }
 175
 176 void
 177 ScreenManager::update_gamelogic(float elapsed_time)
 178 {
 179   Scripting::update_debugger();
 180   Scripting::TimeScheduler::instance->update(game_time);
 181   current_screen->update(elapsed_time);
 182   if (MenuManager::current() != NULL)
 183     MenuManager::current()->update();
 184   if(screen_fade.get() != NULL)
 185     screen_fade->update(elapsed_time);
 186   Console::instance->update(elapsed_time);
 187 }
 188
 189 void
 190 ScreenManager::process_events()
 191 {
 192   g_main_controller->update();
 193   Uint8* keystate = SDL_GetKeyState(NULL);
 194   SDL_Event event;
 195   while(SDL_PollEvent(&event))
 196   {
 197     g_main_controller->process_event(event);
 198
 199     if(MenuManager::current() != NULL)
 200       MenuManager::current()->event(event);
 201
 202     switch(event.type)
 203     {
 204       case SDL_QUIT:
 205         quit();
 206         break;
 207
 208       case SDL_VIDEORESIZE:
 209         Renderer::instance()->resize(event.resize.w, event.resize.h);
 210         MenuManager::recalc_pos();
 211         break;
 212
 213       case SDL_KEYDOWN:
 214         if (event.key.keysym.sym == SDLK_F10)
 215         {
 216           g_config->show_fps = !g_config->show_fps;
 217         }
 218         if (event.key.keysym.sym == SDLK_F11)
 219         {
 220           g_config->use_fullscreen = !g_config->use_fullscreen;
 221           Renderer::instance()->apply_config();
 222           MenuManager::recalc_pos();
 223         }
 224         else if (event.key.keysym.sym == SDLK_PRINT ||
 225                  event.key.keysym.sym == SDLK_F12)
 226         {
 227           take_screenshot();
 228         }
 229         else if (event.key.keysym.sym == SDLK_F1 &&
 230                  (keystate[SDLK_LCTRL] || keystate[SDLK_RCTRL]) &&
 231                  keystate[SDLK_c])
 232         {
 233           Console::instance->toggle();
 234           g_config->console_enabled = true;
 235           g_config->save();
 236         }
 237         break;
 238     }
 239   }
 240 }
 241
 242 void
 243 ScreenManager::handle_screen_switch()
 244 {
 245   while( (next_screen.get() != NULL || nextpop) &&
 246          has_no_pending_fadeout()) {
 247     if(current_screen.get() != NULL) {
 248       current_screen->leave();
 249     }
 250
 251     if(nextpop) {
 252       if(screen_stack.empty()) {
 253         running = false;
 254         break;
 255       }
 256       next_screen.reset(screen_stack.back());
 257       screen_stack.pop_back();
 258     }
 259     if(nextpush && current_screen.get() != NULL) {
 260       screen_stack.push_back(current_screen.release());
 261     }
 262
 263     nextpush = false;
 264     nextpop = false;
 265     speed = 1.0;
 266     Screen* next_screen_ptr = next_screen.release();
 267     next_screen.reset(0);
 268     if(next_screen_ptr)
 269       next_screen_ptr->setup();
 270     current_screen.reset(next_screen_ptr);
 271     screen_fade.reset(NULL);
 272
 273     waiting_threads.wakeup();
 274   }
 275 }
 276
 277 void
 278 ScreenManager::run(DrawingContext &context)
 279 {
 280   Uint32 last_ticks = 0;
 281   Uint32 elapsed_ticks = 0;
 282
 283   running = true;
 284   while(running) {
 285
 286     handle_screen_switch();
 287     if(!running || current_screen.get() == NULL)
 288       break;
 289
 290     Uint32 ticks = SDL_GetTicks();
 291     elapsed_ticks += ticks - last_ticks;
 292     last_ticks = ticks;
 293
 294     Uint32 ticks_per_frame = (Uint32) (TICKS_PER_FRAME * g_game_speed);
 295
 296     if (elapsed_ticks > ticks_per_frame*4) {
 297       // when the game loads up or levels are switched the
 298       // elapsed_ticks grows extremely large, so we just ignore those
 299       // large time jumps
 300       elapsed_ticks = 0;
 301     }
 302
 303     if(elapsed_ticks < ticks_per_frame)
 304     {
 305       Uint32 delay_ticks = ticks_per_frame - elapsed_ticks;
 306       SDL_Delay(delay_ticks);
 307       last_ticks += delay_ticks;
 308       elapsed_ticks += delay_ticks;
 309     }
 310
 311     int frames = 0;
 312
 313     while(elapsed_ticks >= ticks_per_frame && frames < MAX_FRAME_SKIP)
 314     {
 315       elapsed_ticks -= ticks_per_frame;
 316       float timestep = 1.0 / LOGICAL_FPS;
 317       real_time += timestep;
 318       timestep *= speed;
 319       game_time += timestep;
 320
 321       process_events();
 322       update_gamelogic(timestep);
 323       frames += 1;
 324     }
 325
 326     draw(context);
 327
 328     sound_manager->update();
 329   }
 330 }
 331
 332 void
 333 ScreenManager::take_screenshot()
 334 {
 335   screenshot_requested = true;
 336 }
 337
 338 /* EOF */