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/input_manager.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/console.hpp"
  26 #include "supertux/constants.hpp"
  27 #include "supertux/gameconfig.hpp"
  28 #include "supertux/globals.hpp"
  29 #include "supertux/main.hpp"
  30 #include "supertux/menu/menu_storage.hpp"
  31 #include "supertux/player_status.hpp"
  32 #include "supertux/resources.hpp"
  33 #include "supertux/screen.hpp"
  34 #include "supertux/screen_fade.hpp"
  35 #include "supertux/timer.hpp"
  36 #include "video/drawing_context.hpp"
  37 #include "video/renderer.hpp"
  38
  39 #include <stdio.h>
  40 /** ticks (as returned from SDL_GetTicks) per frame */
  41 static const Uint32 TICKS_PER_FRAME = (Uint32) (1000.0 / LOGICAL_FPS);
  42 /** don't skip more than every 2nd frame */
  43 static const int MAX_FRAME_SKIP = 2;
  44
  45 ScreenManager::ScreenManager() :
  46   waiting_threads(),
  47   m_menu_storage(new MenuStorage),
  48   m_menu_manager(new MenuManager),
  49   running(),
  50   speed(1.0),
  51   nextpop(false),
  52   nextpush(false),
  53   fps(0),
  54   next_screen(),
  55   current_screen(),
  56   console(),
  57   screen_fade(),
  58   screen_stack(),
  59   screenshot_requested(false)
  60 {
  61   using namespace scripting;
  62   TimeScheduler::instance = new TimeScheduler();
  63 }
  64
  65 ScreenManager::~ScreenManager()
  66 {
  67   using namespace scripting;
  68   delete TimeScheduler::instance;
  69   TimeScheduler::instance = NULL;
  70 }
  71
  72 void
  73 ScreenManager::push_screen(std::unique_ptr<Screen> screen, std::unique_ptr<ScreenFade> screen_fade)
  74 {
  75   assert(!this->next_screen);
  76   this->next_screen = std::move(screen);
  77   this->screen_fade = std::move(screen_fade);
  78   nextpush = !nextpop;
  79   nextpop = false;
  80   speed = 1.0f;
  81 }
  82
  83 void
  84 ScreenManager::exit_screen(std::unique_ptr<ScreenFade> screen_fade)
  85 {
  86   next_screen.reset();
  87   this->screen_fade = std::move(screen_fade);
  88   nextpop = true;
  89   nextpush = false;
  90 }
  91
  92 void
  93 ScreenManager::set_screen_fade(std::unique_ptr<ScreenFade> screen_fade)
  94 {
  95   this->screen_fade = std::move(screen_fade);
  96 }
  97
  98 void
  99 ScreenManager::quit(std::unique_ptr<ScreenFade> screen_fade)
 100 {
 101   screen_stack.clear();
 102   exit_screen(std::move(screen_fade));
 103 }
 104
 105 void
 106 ScreenManager::set_speed(float speed)
 107 {
 108   this->speed = speed;
 109 }
 110
 111 float
 112 ScreenManager::get_speed() const
 113 {
 114   return speed;
 115 }
 116
 117 bool
 118 ScreenManager::has_no_pending_fadeout() const
 119 {
 120   return screen_fade.get() == NULL || screen_fade->done();
 121 }
 122
 123 void
 124 ScreenManager::draw_fps(DrawingContext& context, float fps_fps)
 125 {
 126   char str[60];
 127   snprintf(str, sizeof(str), "%3.1f", fps_fps);
 128   const char* fpstext = "FPS";
 129   context.draw_text(Resources::small_font, fpstext,
 130                     Vector(SCREEN_WIDTH - Resources::small_font->get_text_width(fpstext) - Resources::small_font->get_text_width(" 99999") - BORDER_X,
 131                            BORDER_Y + 20), ALIGN_LEFT, LAYER_HUD);
 132   context.draw_text(Resources::small_font, str, Vector(SCREEN_WIDTH - BORDER_X, BORDER_Y + 20), ALIGN_RIGHT, LAYER_HUD);
 133 }
 134
 135 void
 136 ScreenManager::draw(DrawingContext& context)
 137 {
 138   static Uint32 fps_ticks = SDL_GetTicks();
 139   static int frame_count = 0;
 140
 141   current_screen->draw(context);
 142   m_menu_manager->draw(context);
 143   if(screen_fade.get() != NULL)
 144     screen_fade->draw(context);
 145   Console::instance->draw(context);
 146
 147   if(g_config->show_fps)
 148     draw_fps(context, fps);
 149
 150   // if a screenshot was requested, pass request on to drawing_context
 151   if (screenshot_requested) {
 152     context.take_screenshot();
 153     screenshot_requested = false;
 154   }
 155   context.do_drawing();
 156
 157   /* Calculate frames per second */
 158   if(g_config->show_fps)
 159   {
 160     ++frame_count;
 161
 162     if(SDL_GetTicks() - fps_ticks >= 500)
 163     {
 164       fps = (float) frame_count / .5;
 165       frame_count = 0;
 166       fps_ticks = SDL_GetTicks();
 167     }
 168   }
 169 }
 170
 171 void
 172 ScreenManager::update_gamelogic(float elapsed_time)
 173 {
 174   scripting::update_debugger();
 175   scripting::TimeScheduler::instance->update(game_time);
 176   current_screen->update(elapsed_time);
 177   m_menu_manager->process_input();
 178   if(screen_fade.get() != NULL)
 179     screen_fade->update(elapsed_time);
 180   Console::instance->update(elapsed_time);
 181 }
 182
 183 void
 184 ScreenManager::process_events()
 185 {
 186   g_input_manager->update();
 187   SDL_Event event;
 188   while(SDL_PollEvent(&event))
 189   {
 190     g_input_manager->process_event(event);
 191
 192     m_menu_manager->event(event);
 193
 194     switch(event.type)
 195     {
 196       case SDL_QUIT:
 197         quit();
 198         break;
 199
 200       case SDL_WINDOWEVENT:
 201         switch(event.window.event)
 202         {
 203           case SDL_WINDOWEVENT_RESIZED:
 204             Renderer::instance()->resize(event.window.data1,
 205                                          event.window.data2);
 206             m_menu_manager->on_window_resize();
 207             break;
 208         }
 209         break;
 210
 211       case SDL_KEYDOWN:
 212         if (event.key.keysym.sym == SDLK_F10)
 213         {
 214           g_config->show_fps = !g_config->show_fps;
 215         }
 216         if (event.key.keysym.sym == SDLK_F11)
 217         {
 218           g_config->use_fullscreen = !g_config->use_fullscreen;
 219           Renderer::instance()->apply_config();
 220           m_menu_manager->on_window_resize();
 221         }
 222         else if (event.key.keysym.sym == SDLK_PRINTSCREEN ||
 223                  event.key.keysym.sym == SDLK_F12)
 224         {
 225           take_screenshot();
 226         }
 227         else if (event.key.keysym.sym == SDLK_F1 &&
 228                  event.key.keysym.mod & KMOD_CTRL)
 229         {
 230           Console::instance->toggle();
 231           g_config->console_enabled = true;
 232           g_config->save();
 233         }
 234         break;
 235     }
 236   }
 237 }
 238
 239 void
 240 ScreenManager::handle_screen_switch()
 241 {
 242   while((next_screen || nextpop) &&
 243         has_no_pending_fadeout())
 244   {
 245     if(current_screen) {
 246       current_screen->leave();
 247     }
 248
 249     if(nextpop) {
 250       if(screen_stack.empty()) {
 251         running = false;
 252         break;
 253       }
 254       next_screen = std::move(screen_stack.back());
 255       screen_stack.pop_back();
 256     }
 257     if(nextpush && current_screen) {
 258       screen_stack.push_back(std::move(current_screen));
 259     }
 260
 261     nextpush = false;
 262     nextpop = false;
 263     speed = 1.0;
 264     current_screen = std::move(next_screen);
 265     if(current_screen)
 266       current_screen->setup();
 267     screen_fade.reset();
 268
 269     waiting_threads.wakeup();
 270   }
 271 }
 272
 273 void
 274 ScreenManager::run(DrawingContext &context)
 275 {
 276   Uint32 last_ticks = 0;
 277   Uint32 elapsed_ticks = 0;
 278
 279   running = true;
 280   while(running) {
 281
 282     handle_screen_switch();
 283     if(!running || !current_screen)
 284       break;
 285
 286     Uint32 ticks = SDL_GetTicks();
 287     elapsed_ticks += ticks - last_ticks;
 288     last_ticks = ticks;
 289
 290     Uint32 ticks_per_frame = (Uint32) (TICKS_PER_FRAME * g_game_speed);
 291
 292     if (elapsed_ticks > ticks_per_frame*4) {
 293       // when the game loads up or levels are switched the
 294       // elapsed_ticks grows extremely large, so we just ignore those
 295       // large time jumps
 296       elapsed_ticks = 0;
 297     }
 298
 299     if(elapsed_ticks < ticks_per_frame)
 300     {
 301       Uint32 delay_ticks = ticks_per_frame - elapsed_ticks;
 302       SDL_Delay(delay_ticks);
 303       last_ticks += delay_ticks;
 304       elapsed_ticks += delay_ticks;
 305     }
 306
 307     int frames = 0;
 308
 309     while(elapsed_ticks >= ticks_per_frame && frames < MAX_FRAME_SKIP)
 310     {
 311       elapsed_ticks -= ticks_per_frame;
 312       float timestep = 1.0 / LOGICAL_FPS;
 313       real_time += timestep;
 314       timestep *= speed;
 315       game_time += timestep;
 316
 317       process_events();
 318       update_gamelogic(timestep);
 319       frames += 1;
 320     }
 321
 322     draw(context);
 323
 324     sound_manager->update();
 325   }
 326 }
 327
 328 void
 329 ScreenManager::take_screenshot()
 330 {
 331   screenshot_requested = true;
 332 }
 333
 334 /* EOF */