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 float g_game_speed = 1.0f;
  44
  45 ScreenManager* g_screen_manager = NULL;
  46
  47 ScreenManager::ScreenManager() :
  48   waiting_threads(),
  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   for(std::vector<Screen*>::iterator i = screen_stack.begin();
  72       i != screen_stack.end(); ++i) {
  73     delete *i;
  74   }
  75 }
  76
  77 void
  78 ScreenManager::push_screen(Screen* screen, ScreenFade* screen_fade)
  79 {
  80   this->next_screen.reset(screen);
  81   this->screen_fade.reset(screen_fade);
  82   nextpush = !nextpop;
  83   nextpop = false;
  84   speed = 1.0f;
  85 }
  86
  87 void
  88 ScreenManager::exit_screen(ScreenFade* screen_fade)
  89 {
  90   next_screen.reset(NULL);
  91   this->screen_fade.reset(screen_fade);
  92   nextpop = true;
  93   nextpush = false;
  94 }
  95
  96 void
  97 ScreenManager::set_screen_fade(ScreenFade* screen_fade)
  98 {
  99   this->screen_fade.reset(screen_fade);
 100 }
 101
 102 void
 103 ScreenManager::quit(ScreenFade* screen_fade)
 104 {
 105   for(std::vector<Screen*>::iterator i = screen_stack.begin();
 106       i != screen_stack.end(); ++i)
 107     delete *i;
 108   screen_stack.clear();
 109
 110   exit_screen(screen_fade);
 111 }
 112
 113 void
 114 ScreenManager::set_speed(float speed)
 115 {
 116   this->speed = speed;
 117 }
 118
 119 float
 120 ScreenManager::get_speed() const
 121 {
 122   return speed;
 123 }
 124
 125 bool
 126 ScreenManager::has_no_pending_fadeout() const
 127 {
 128   return screen_fade.get() == NULL || screen_fade->done();
 129 }
 130
 131 void
 132 ScreenManager::draw_fps(DrawingContext& context, float fps_fps)
 133 {
 134   char str[60];
 135   snprintf(str, sizeof(str), "%3.1f", fps_fps);
 136   const char* fpstext = "FPS";
 137   context.draw_text(Resources::small_font, fpstext,
 138                     Vector(SCREEN_WIDTH - Resources::small_font->get_text_width(fpstext) - Resources::small_font->get_text_width(" 99999") - BORDER_X,
 139                            BORDER_Y + 20), ALIGN_LEFT, LAYER_HUD);
 140   context.draw_text(Resources::small_font, str, Vector(SCREEN_WIDTH - BORDER_X, BORDER_Y + 20), ALIGN_RIGHT, LAYER_HUD);
 141 }
 142
 143 void
 144 ScreenManager::draw(DrawingContext& context)
 145 {
 146   static Uint32 fps_ticks = SDL_GetTicks();
 147   static int frame_count = 0;
 148
 149   current_screen->draw(context);
 150   if(MenuManager::current() != NULL)
 151     MenuManager::current()->draw(context);
 152   if(screen_fade.get() != NULL)
 153     screen_fade->draw(context);
 154   Console::instance->draw(context);
 155
 156   if(g_config->show_fps)
 157     draw_fps(context, fps);
 158
 159   // if a screenshot was requested, pass request on to drawing_context
 160   if (screenshot_requested) {
 161     context.take_screenshot();
 162     screenshot_requested = false;
 163   }
 164   context.do_drawing();
 165
 166   /* Calculate frames per second */
 167   if(g_config->show_fps)
 168   {
 169     ++frame_count;
 170
 171     if(SDL_GetTicks() - fps_ticks >= 500)
 172     {
 173       fps = (float) frame_count / .5;
 174       frame_count = 0;
 175       fps_ticks = SDL_GetTicks();
 176     }
 177   }
 178 }
 179
 180 void
 181 ScreenManager::update_gamelogic(float elapsed_time)
 182 {
 183   Scripting::update_debugger();
 184   Scripting::TimeScheduler::instance->update(game_time);
 185   current_screen->update(elapsed_time);
 186   if (MenuManager::current() != NULL)
 187     MenuManager::current()->update();
 188   if(screen_fade.get() != NULL)
 189     screen_fade->update(elapsed_time);
 190   Console::instance->update(elapsed_time);
 191 }
 192
 193 void
 194 ScreenManager::process_events()
 195 {
 196   g_main_controller->update();
 197   Uint8* keystate = SDL_GetKeyState(NULL);
 198   SDL_Event event;
 199   while(SDL_PollEvent(&event))
 200   {
 201     g_main_controller->process_event(event);
 202
 203     if(MenuManager::current() != NULL)
 204       MenuManager::current()->event(event);
 205
 206     switch(event.type)
 207     {
 208       case SDL_QUIT:
 209         quit();
 210         break;
 211
 212       case SDL_VIDEORESIZE:
 213         Renderer::instance()->resize(event.resize.w, event.resize.h);
 214         MenuManager::recalc_pos();
 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         if (event.key.keysym.sym == SDLK_F11)
 223         {
 224           g_config->use_fullscreen = !g_config->use_fullscreen;
 225           Renderer::instance()->apply_config();
 226           MenuManager::recalc_pos();
 227         }
 228         else if (event.key.keysym.sym == SDLK_PRINT ||
 229                  event.key.keysym.sym == SDLK_F12)
 230         {
 231           take_screenshot();
 232         }
 233         else if (event.key.keysym.sym == SDLK_F1 &&
 234                  (keystate[SDLK_LCTRL] || keystate[SDLK_RCTRL]) &&
 235                  keystate[SDLK_c])
 236         {
 237           Console::instance->toggle();
 238           g_config->console_enabled = true;
 239           g_config->save();
 240         }
 241         break;
 242     }
 243   }
 244 }
 245
 246 void
 247 ScreenManager::handle_screen_switch()
 248 {
 249   while( (next_screen.get() != NULL || nextpop) &&
 250          has_no_pending_fadeout()) {
 251     if(current_screen.get() != NULL) {
 252       current_screen->leave();
 253     }
 254
 255     if(nextpop) {
 256       if(screen_stack.empty()) {
 257         running = false;
 258         break;
 259       }
 260       next_screen.reset(screen_stack.back());
 261       screen_stack.pop_back();
 262     }
 263     if(nextpush && current_screen.get() != NULL) {
 264       screen_stack.push_back(current_screen.release());
 265     }
 266
 267     nextpush = false;
 268     nextpop = false;
 269     speed = 1.0;
 270     Screen* next_screen_ptr = next_screen.release();
 271     next_screen.reset(0);
 272     if(next_screen_ptr)
 273       next_screen_ptr->setup();
 274     current_screen.reset(next_screen_ptr);
 275     screen_fade.reset(NULL);
 276
 277     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   running = true;
 288   while(running) {
 289
 290     handle_screen_switch();
 291     if(!running || current_screen.get() == NULL)
 292       break;
 293
 294     Uint32 ticks = SDL_GetTicks();
 295     elapsed_ticks += ticks - last_ticks;
 296     last_ticks = ticks;
 297
 298     Uint32 ticks_per_frame = (Uint32) (TICKS_PER_FRAME * g_game_speed);
 299
 300     if (elapsed_ticks > ticks_per_frame*4) {
 301       // when the game loads up or levels are switched the
 302       // elapsed_ticks grows extremely large, so we just ignore those
 303       // large time jumps
 304       elapsed_ticks = 0;
 305     }
 306
 307     if(elapsed_ticks < ticks_per_frame)
 308     {
 309       Uint32 delay_ticks = ticks_per_frame - elapsed_ticks;
 310       SDL_Delay(delay_ticks);
 311       last_ticks += delay_ticks;
 312       elapsed_ticks += delay_ticks;
 313     }
 314
 315     int frames = 0;
 316
 317     while(elapsed_ticks >= ticks_per_frame && frames < MAX_FRAME_SKIP)
 318     {
 319       elapsed_ticks -= ticks_per_frame;
 320       float timestep = 1.0 / LOGICAL_FPS;
 321       real_time += timestep;
 322       timestep *= speed;
 323       game_time += timestep;
 324
 325       process_events();
 326       update_gamelogic(timestep);
 327       frames += 1;
 328     }
 329
 330     draw(context);
 331
 332     sound_manager->update();
 333   }
 334 }
 335
 336 void
 337 ScreenManager::take_screenshot()
 338 {
 339   screenshot_requested = true;
 340 }
 341
 342 /* EOF */