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   m_waiting_threads(),
  47   m_menu_storage(new MenuStorage),
  48   m_menu_manager(new MenuManager),
  49   m_running(),
  50   m_speed(1.0),
  51   m_nextpop(false),
  52   m_nextpush(false),
  53   m_fps(0),
  54   m_next_screen(),
  55   m_current_screen(),
  56   m_screen_fade(),
  57   m_screen_stack(),
  58   m_screenshot_requested(false)
  59 {
  60   using namespace scripting;
  61   TimeScheduler::instance = new TimeScheduler();
  62 }
  63
  64 ScreenManager::~ScreenManager()
  65 {
  66   using namespace scripting;
  67   delete TimeScheduler::instance;
  68   TimeScheduler::instance = NULL;
  69 }
  70
  71 void
  72 ScreenManager::push_screen(std::unique_ptr<Screen> screen, std::unique_ptr<ScreenFade> screen_fade)
  73 {
  74   assert(!m_next_screen);
  75   m_next_screen = std::move(screen);
  76   m_screen_fade = std::move(screen_fade);
  77   m_nextpush = !m_nextpop;
  78   m_nextpop = false;
  79   m_speed = 1.0f;
  80 }
  81
  82 void
  83 ScreenManager::exit_screen(std::unique_ptr<ScreenFade> screen_fade)
  84 {
  85   m_next_screen.reset();
  86   m_screen_fade = std::move(screen_fade);
  87   m_nextpop = true;
  88   m_nextpush = false;
  89 }
  90
  91 void
  92 ScreenManager::set_screen_fade(std::unique_ptr<ScreenFade> screen_fade)
  93 {
  94   m_screen_fade = std::move(screen_fade);
  95 }
  96
  97 void
  98 ScreenManager::quit(std::unique_ptr<ScreenFade> screen_fade)
  99 {
 100   m_screen_stack.clear();
 101   exit_screen(std::move(screen_fade));
 102 }
 103
 104 void
 105 ScreenManager::set_speed(float speed)
 106 {
 107   m_speed = speed;
 108 }
 109
 110 float
 111 ScreenManager::get_speed() const
 112 {
 113   return m_speed;
 114 }
 115
 116 bool
 117 ScreenManager::has_no_pending_fadeout() const
 118 {
 119   return !m_screen_fade || m_screen_fade->done();
 120 }
 121
 122 void
 123 ScreenManager::draw_fps(DrawingContext& context, float fps_fps)
 124 {
 125   char str[60];
 126   snprintf(str, sizeof(str), "%3.1f", fps_fps);
 127   const char* fpstext = "FPS";
 128   context.draw_text(Resources::small_font, fpstext,
 129                     Vector(SCREEN_WIDTH - Resources::small_font->get_text_width(fpstext) - Resources::small_font->get_text_width(" 99999") - BORDER_X,
 130                            BORDER_Y + 20), ALIGN_LEFT, LAYER_HUD);
 131   context.draw_text(Resources::small_font, str, Vector(SCREEN_WIDTH - BORDER_X, BORDER_Y + 20), ALIGN_RIGHT, LAYER_HUD);
 132 }
 133
 134 void
 135 ScreenManager::draw(DrawingContext& context)
 136 {
 137   static Uint32 fps_ticks = SDL_GetTicks();
 138   static int frame_count = 0;
 139
 140   m_current_screen->draw(context);
 141   m_menu_manager->draw(context);
 142   if (m_screen_fade)
 143   {
 144     m_screen_fade->draw(context);
 145   }
 146   Console::instance->draw(context);
 147
 148   if (g_config->show_fps)
 149   {
 150     draw_fps(context, m_fps);
 151   }
 152
 153   // if a screenshot was requested, pass request on to drawing_context
 154   if (m_screenshot_requested)
 155   {
 156     context.take_screenshot();
 157     m_screenshot_requested = false;
 158   }
 159   context.do_drawing();
 160
 161   /* Calculate frames per second */
 162   if (g_config->show_fps)
 163   {
 164     ++frame_count;
 165
 166     if (SDL_GetTicks() - fps_ticks >= 500)
 167     {
 168       m_fps = (float) frame_count / .5;
 169       frame_count = 0;
 170       fps_ticks = SDL_GetTicks();
 171     }
 172   }
 173 }
 174
 175 void
 176 ScreenManager::update_gamelogic(float elapsed_time)
 177 {
 178   scripting::update_debugger();
 179   scripting::TimeScheduler::instance->update(game_time);
 180   m_current_screen->update(elapsed_time);
 181   m_menu_manager->process_input();
 182   if (m_screen_fade)
 183   {
 184     m_screen_fade->update(elapsed_time);
 185   }
 186   Console::instance->update(elapsed_time);
 187 }
 188
 189 void
 190 ScreenManager::process_events()
 191 {
 192   g_input_manager->update();
 193   SDL_Event event;
 194   while (SDL_PollEvent(&event))
 195   {
 196     g_input_manager->process_event(event);
 197
 198     m_menu_manager->event(event);
 199
 200     switch(event.type)
 201     {
 202       case SDL_QUIT:
 203         quit();
 204         break;
 205
 206       case SDL_WINDOWEVENT:
 207         switch(event.window.event)
 208         {
 209           case SDL_WINDOWEVENT_RESIZED:
 210             Renderer::instance()->resize(event.window.data1,
 211                                          event.window.data2);
 212             m_menu_manager->on_window_resize();
 213             break;
 214         }
 215         break;
 216
 217       case SDL_KEYDOWN:
 218         if (event.key.keysym.sym == SDLK_F10)
 219         {
 220           g_config->show_fps = !g_config->show_fps;
 221         }
 222         else if (event.key.keysym.sym == SDLK_F11)
 223         {
 224           g_config->use_fullscreen = !g_config->use_fullscreen;
 225           Renderer::instance()->apply_config();
 226           m_menu_manager->on_window_resize();
 227         }
 228         else if (event.key.keysym.sym == SDLK_PRINTSCREEN ||
 229                  event.key.keysym.sym == SDLK_F12)
 230         {
 231           take_screenshot();
 232         }
 233         else if (event.key.keysym.sym == SDLK_F1 &&
 234                  event.key.keysym.mod & KMOD_CTRL)
 235         {
 236           Console::instance->toggle();
 237           g_config->console_enabled = true;
 238           g_config->save();
 239         }
 240         break;
 241     }
 242   }
 243 }
 244
 245 void
 246 ScreenManager::handle_screen_switch()
 247 {
 248   while ((m_next_screen || m_nextpop) &&
 249         has_no_pending_fadeout())
 250   {
 251     if (m_current_screen) {
 252       m_current_screen->leave();
 253     }
 254
 255     if (m_nextpop) {
 256       if (m_screen_stack.empty()) {
 257         m_running = false;
 258         break;
 259       }
 260       m_next_screen = std::move(m_screen_stack.back());
 261       m_screen_stack.pop_back();
 262     }
 263     if (m_nextpush && m_current_screen) {
 264       m_screen_stack.push_back(std::move(m_current_screen));
 265     }
 266
 267     m_nextpush = false;
 268     m_nextpop = false;
 269     m_speed = 1.0;
 270     m_current_screen = std::move(m_next_screen);
 271     if (m_current_screen)
 272     {
 273       m_current_screen->setup();
 274     }
 275     m_screen_fade.reset();
 276
 277     m_waiting_threads.wakeup();
 278   }
 279 }
 280
 281 void
 282 ScreenManager::run(DrawingContext &context)
 283 {
 284   Uint32 last_ticks = 0;
 285   Uint32 elapsed_ticks = 0;
 286
 287   m_running = true;
 288   while (m_running)
 289   {
 290     handle_screen_switch();
 291     if (!m_running || !m_current_screen)
 292     {
 293       break;
 294     }
 295
 296     Uint32 ticks = SDL_GetTicks();
 297     elapsed_ticks += ticks - last_ticks;
 298     last_ticks = ticks;
 299
 300     Uint32 ticks_per_frame = (Uint32) (TICKS_PER_FRAME * g_game_speed);
 301
 302     if (elapsed_ticks > ticks_per_frame*4)
 303     {
 304       // when the game loads up or levels are switched the
 305       // elapsed_ticks grows extremely large, so we just ignore those
 306       // large time jumps
 307       elapsed_ticks = 0;
 308     }
 309
 310     if (elapsed_ticks < ticks_per_frame)
 311     {
 312       Uint32 delay_ticks = ticks_per_frame - elapsed_ticks;
 313       SDL_Delay(delay_ticks);
 314       last_ticks += delay_ticks;
 315       elapsed_ticks += delay_ticks;
 316     }
 317
 318     int frames = 0;
 319
 320     while (elapsed_ticks >= ticks_per_frame && frames < MAX_FRAME_SKIP)
 321     {
 322       elapsed_ticks -= ticks_per_frame;
 323       float timestep = 1.0 / LOGICAL_FPS;
 324       real_time += timestep;
 325       timestep *= m_speed;
 326       game_time += timestep;
 327
 328       process_events();
 329       update_gamelogic(timestep);
 330       frames += 1;
 331     }
 332
 333     draw(context);
 334
 335     sound_manager->update();
 336   }
 337 }
 338
 339 void
 340 ScreenManager::take_screenshot()
 341 {
 342   m_screenshot_requested = true;
 343 }
 344
 345 /* EOF */