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 #include <stdio.h>
  39 /** ticks (as returned from SDL_GetTicks) per frame */
  40 static const Uint32 TICKS_PER_FRAME = (Uint32) (1000.0 / LOGICAL_FPS);
  41 /** don't skip more than every 2nd frame */
  42 static const int MAX_FRAME_SKIP = 2;
  43
  44 ScreenManager::ScreenManager() :
  45   waiting_threads(),
  46   running(),
  47   speed(1.0),
  48   nextpop(false),
  49   nextpush(false),
  50   fps(0),
  51   next_screen(),
  52   current_screen(),
  53   console(),
  54   screen_fade(),
  55   screen_stack(),
  56   screenshot_requested(false)
  57 {
  58   using namespace scripting;
  59   TimeScheduler::instance = new TimeScheduler();
  60 }
  61
  62 ScreenManager::~ScreenManager()
  63 {
  64   using namespace scripting;
  65   delete TimeScheduler::instance;
  66   TimeScheduler::instance = NULL;
  67
  68   for(std::vector<Screen*>::iterator i = screen_stack.begin();
  69       i != screen_stack.end(); ++i) {
  70     delete *i;
  71   }
  72 }
  73
  74 void
  75 ScreenManager::push_screen(Screen* screen, ScreenFade* screen_fade)
  76 {
  77   this->next_screen.reset(screen);
  78   this->screen_fade.reset(screen_fade);
  79   nextpush = !nextpop;
  80   nextpop = false;
  81   speed = 1.0f;
  82 }
  83
  84 void
  85 ScreenManager::exit_screen(ScreenFade* screen_fade)
  86 {
  87   next_screen.reset(NULL);
  88   this->screen_fade.reset(screen_fade);
  89   nextpop = true;
  90   nextpush = false;
  91 }
  92
  93 void
  94 ScreenManager::set_screen_fade(ScreenFade* screen_fade)
  95 {
  96   this->screen_fade.reset(screen_fade);
  97 }
  98
  99 void
 100 ScreenManager::quit(ScreenFade* screen_fade)
 101 {
 102   for(std::vector<Screen*>::iterator i = screen_stack.begin();
 103       i != screen_stack.end(); ++i)
 104     delete *i;
 105   screen_stack.clear();
 106
 107   exit_screen(screen_fade);
 108 }
 109
 110 void
 111 ScreenManager::set_speed(float speed)
 112 {
 113   this->speed = speed;
 114 }
 115
 116 float
 117 ScreenManager::get_speed() const
 118 {
 119   return speed;
 120 }
 121
 122 bool
 123 ScreenManager::has_no_pending_fadeout() const
 124 {
 125   return screen_fade.get() == NULL || screen_fade->done();
 126 }
 127
 128 void
 129 ScreenManager::draw_fps(DrawingContext& context, float fps_fps)
 130 {
 131   char str[60];
 132   snprintf(str, sizeof(str), "%3.1f", fps_fps);
 133   const char* fpstext = "FPS";
 134   context.draw_text(Resources::small_font, fpstext,
 135                     Vector(SCREEN_WIDTH - Resources::small_font->get_text_width(fpstext) - Resources::small_font->get_text_width(" 99999") - BORDER_X,
 136                            BORDER_Y + 20), ALIGN_LEFT, LAYER_HUD);
 137   context.draw_text(Resources::small_font, str, Vector(SCREEN_WIDTH - BORDER_X, BORDER_Y + 20), ALIGN_RIGHT, LAYER_HUD);
 138 }
 139
 140 void
 141 ScreenManager::draw(DrawingContext& context)
 142 {
 143   static Uint32 fps_ticks = SDL_GetTicks();
 144   static int frame_count = 0;
 145
 146   current_screen->draw(context);
 147   if(MenuManager::current() != NULL)
 148     MenuManager::current()->draw(context);
 149   if(screen_fade.get() != NULL)
 150     screen_fade->draw(context);
 151   Console::instance->draw(context);
 152
 153   if(g_config->show_fps)
 154     draw_fps(context, fps);
 155
 156   // if a screenshot was requested, pass request on to drawing_context
 157   if (screenshot_requested) {
 158     context.take_screenshot();
 159     screenshot_requested = false;
 160   }
 161   context.do_drawing();
 162
 163   /* Calculate frames per second */
 164   if(g_config->show_fps)
 165   {
 166     ++frame_count;
 167
 168     if(SDL_GetTicks() - fps_ticks >= 500)
 169     {
 170       fps = (float) frame_count / .5;
 171       frame_count = 0;
 172       fps_ticks = SDL_GetTicks();
 173     }
 174   }
 175 }
 176
 177 void
 178 ScreenManager::update_gamelogic(float elapsed_time)
 179 {
 180   scripting::update_debugger();
 181   scripting::TimeScheduler::instance->update(game_time);
 182   current_screen->update(elapsed_time);
 183   if (MenuManager::current() != NULL)
 184     MenuManager::current()->update();
 185   if(screen_fade.get() != NULL)
 186     screen_fade->update(elapsed_time);
 187   Console::instance->update(elapsed_time);
 188 }
 189
 190 void
 191 ScreenManager::process_events()
 192 {
 193   g_jk_controller->update();
 194   SDL_Event event;
 195   while(SDL_PollEvent(&event))
 196   {
 197     g_jk_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_WINDOWEVENT:
 209         switch(event.window.type)
 210         {
 211           case SDL_WINDOWEVENT_RESIZED:
 212             Renderer::instance()->resize(event.window.data1,
 213                                          event.window.data2);
 214             MenuManager::recalc_pos();
 215             break;
 216         }
 217         break;
 218
 219       case SDL_KEYDOWN:
 220         if (event.key.keysym.sym == SDLK_F10)
 221         {
 222           g_config->show_fps = !g_config->show_fps;
 223         }
 224         if (event.key.keysym.sym == SDLK_F11)
 225         {
 226           g_config->use_fullscreen = !g_config->use_fullscreen;
 227           Renderer::instance()->apply_config();
 228           MenuManager::recalc_pos();
 229         }
 230         else if (event.key.keysym.sym == SDLK_PRINTSCREEN ||
 231                  event.key.keysym.sym == SDLK_F12)
 232         {
 233           take_screenshot();
 234         }
 235         else if (event.key.keysym.sym == SDLK_F1 &&
 236                  event.key.keysym.mod & KMOD_CTRL)
 237         {
 238           Console::instance->toggle();
 239           g_config->console_enabled = true;
 240           g_config->save();
 241         }
 242         break;
 243     }
 244   }
 245 }
 246
 247 void
 248 ScreenManager::handle_screen_switch()
 249 {
 250   while( (next_screen.get() != NULL || nextpop) &&
 251          has_no_pending_fadeout()) {
 252     if(current_screen.get() != NULL) {
 253       current_screen->leave();
 254     }
 255
 256     if(nextpop) {
 257       if(screen_stack.empty()) {
 258         running = false;
 259         break;
 260       }
 261       next_screen.reset(screen_stack.back());
 262       screen_stack.pop_back();
 263     }
 264     if(nextpush && current_screen.get() != NULL) {
 265       screen_stack.push_back(current_screen.release());
 266     }
 267
 268     nextpush = false;
 269     nextpop = false;
 270     speed = 1.0;
 271     Screen* next_screen_ptr = next_screen.release();
 272     next_screen.reset(0);
 273     if(next_screen_ptr)
 274       next_screen_ptr->setup();
 275     current_screen.reset(next_screen_ptr);
 276     screen_fade.reset(NULL);
 277
 278     waiting_threads.wakeup();
 279   }
 280 }
 281
 282 void
 283 ScreenManager::run(DrawingContext &context)
 284 {
 285   Uint32 last_ticks = 0;
 286   Uint32 elapsed_ticks = 0;
 287
 288   running = true;
 289   while(running) {
 290
 291     handle_screen_switch();
 292     if(!running || current_screen.get() == NULL)
 293       break;
 294
 295     Uint32 ticks = SDL_GetTicks();
 296     elapsed_ticks += ticks - last_ticks;
 297     last_ticks = ticks;
 298
 299     Uint32 ticks_per_frame = (Uint32) (TICKS_PER_FRAME * g_game_speed);
 300
 301     if (elapsed_ticks > ticks_per_frame*4) {
 302       // when the game loads up or levels are switched the
 303       // elapsed_ticks grows extremely large, so we just ignore those
 304       // large time jumps
 305       elapsed_ticks = 0;
 306     }
 307
 308     if(elapsed_ticks < ticks_per_frame)
 309     {
 310       Uint32 delay_ticks = ticks_per_frame - elapsed_ticks;
 311       SDL_Delay(delay_ticks);
 312       last_ticks += delay_ticks;
 313       elapsed_ticks += delay_ticks;
 314     }
 315
 316     int frames = 0;
 317
 318     while(elapsed_ticks >= ticks_per_frame && frames < MAX_FRAME_SKIP)
 319     {
 320       elapsed_ticks -= ticks_per_frame;
 321       float timestep = 1.0 / LOGICAL_FPS;
 322       real_time += timestep;
 323       timestep *= speed;
 324       game_time += timestep;
 325
 326       process_events();
 327       update_gamelogic(timestep);
 328       frames += 1;
 329     }
 330
 331     draw(context);
 332
 333     sound_manager->update();
 334   }
 335 }
 336
 337 void
 338 ScreenManager::take_screenshot()
 339 {
 340   screenshot_requested = true;
 341 }
 342
 343 /* EOF */