src/supertux/mainloop.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/mainloop.hpp"
  18
  19 #include "audio/sound_manager.hpp"
  20 #include "control/joystickkeyboardcontroller.hpp"
  21 #include "gui/menu.hpp"
  22 #include "scripting/squirrel_util.hpp"
  23 #include "scripting/time_scheduler.hpp"
  24 #include "supertux/constants.hpp"
  25 #include "supertux/console.hpp"
  26 #include "supertux/gameconfig.hpp"
  27 #include "supertux/globals.hpp"
  28 #include "supertux/main.hpp"
  29 #include "supertux/player_status.hpp"
  30 #include "supertux/resources.hpp"
  31 #include "supertux/screen_fade.hpp"
  32 #include "supertux/screen.hpp"
  33 #include "supertux/timer.hpp"
  34 #include "video/drawing_context.hpp"
  35 #include "video/renderer.hpp"
  36
  37 /** ticks (as returned from SDL_GetTicks) per frame */
  38 static const Uint32 TICKS_PER_FRAME = (Uint32) (1000.0 / LOGICAL_FPS);
  39 /** don't skip more than every 2nd frame */
  40 static const int MAX_FRAME_SKIP = 2;
  41
  42 float g_game_speed = 1.0f;
  43
  44 MainLoop* g_main_loop = NULL;
  45
  46 MainLoop::MainLoop() :
  47   waiting_threads(),
  48   running(),
  49   speed(1.0),
  50   nextpop(false),
  51   nextpush(false),
  52   fps(0),
  53   next_screen(),
  54   current_screen(),
  55   console(),
  56   screen_fade(),
  57   screen_stack(),
  58   screenshot_requested(false)
  59 {
  60   using namespace Scripting;
  61   TimeScheduler::instance = new TimeScheduler();
  62 }
  63
  64 MainLoop::~MainLoop()
  65 {
  66   using namespace Scripting;
  67   delete TimeScheduler::instance;
  68   TimeScheduler::instance = NULL;
  69
  70   for(std::vector<Screen*>::iterator i = screen_stack.begin();
  71       i != screen_stack.end(); ++i) {
  72     delete *i;
  73   }
  74 }
  75
  76 void
  77 MainLoop::push_screen(Screen* screen, ScreenFade* screen_fade)
  78 {
  79   this->next_screen.reset(screen);
  80   this->screen_fade.reset(screen_fade);
  81   nextpush = !nextpop;
  82   nextpop = false;
  83   speed = 1.0f;
  84 }
  85
  86 void
  87 MainLoop::exit_screen(ScreenFade* screen_fade)
  88 {
  89   next_screen.reset(NULL);
  90   this->screen_fade.reset(screen_fade);
  91   nextpop = true;
  92   nextpush = false;
  93 }
  94
  95 void
  96 MainLoop::set_screen_fade(ScreenFade* screen_fade)
  97 {
  98   this->screen_fade.reset(screen_fade);
  99 }
 100
 101 void
 102 MainLoop::quit(ScreenFade* screen_fade)
 103 {
 104   for(std::vector<Screen*>::iterator i = screen_stack.begin();
 105       i != screen_stack.end(); ++i)
 106     delete *i;
 107   screen_stack.clear();
 108
 109   exit_screen(screen_fade);
 110 }
 111
 112 void
 113 MainLoop::set_speed(float speed)
 114 {
 115   this->speed = speed;
 116 }
 117
 118 float
 119 MainLoop::get_speed() const
 120 {
 121   return speed;
 122 }
 123
 124 bool
 125 MainLoop::has_no_pending_fadeout() const
 126 {
 127   return screen_fade.get() == NULL || screen_fade->done();
 128 }
 129
 130 void
 131 MainLoop::draw_fps(DrawingContext& context, float fps_fps)
 132 {
 133   char str[60];
 134   snprintf(str, sizeof(str), "%3.1f", fps_fps);
 135   const char* fpstext = "FPS";
 136   context.draw_text(small_font, fpstext, Vector(SCREEN_WIDTH - small_font->get_text_width(fpstext) - small_font->get_text_width(" 99999") - BORDER_X, BORDER_Y + 20), ALIGN_LEFT, LAYER_HUD);
 137   context.draw_text(small_font, str, Vector(SCREEN_WIDTH - BORDER_X, BORDER_Y + 20), ALIGN_RIGHT, LAYER_HUD);
 138 }
 139
 140 void
 141 MainLoop::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(Menu::current() != NULL)
 148     Menu::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 MainLoop::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 (Menu::current() != NULL)
 184     Menu::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 MainLoop::process_events()
 192 {
 193   g_main_controller->update();
 194   Uint8* keystate = SDL_GetKeyState(NULL);
 195   SDL_Event event;
 196   while(SDL_PollEvent(&event))
 197   {
 198     g_main_controller->process_event(event);
 199
 200     if(Menu::current() != NULL)
 201       Menu::current()->event(event);
 202
 203     switch(event.type)
 204     {
 205       case SDL_QUIT:
 206         quit();
 207         break;
 208
 209       case SDL_VIDEORESIZE:
 210         Renderer::instance()->resize(event.resize.w, event.resize.h);
 211         Menu::recalc_pos();
 212         break;
 213
 214       case SDL_KEYDOWN:
 215         if (event.key.keysym.sym == SDLK_F10)
 216         {
 217           g_config->show_fps = !g_config->show_fps;
 218         }
 219         if (event.key.keysym.sym == SDLK_F11)
 220         {
 221           g_config->use_fullscreen = !g_config->use_fullscreen;
 222           init_video();
 223           Menu::recalc_pos();
 224         }
 225         else if (event.key.keysym.sym == SDLK_PRINT ||
 226                  event.key.keysym.sym == SDLK_F12)
 227         {
 228           take_screenshot();
 229         }
 230         else if (event.key.keysym.sym == SDLK_F1 &&
 231                  (keystate[SDLK_LCTRL] || keystate[SDLK_RCTRL]) &&
 232                  keystate[SDLK_c])
 233         {
 234           Console::instance->toggle();
 235           g_config->console_enabled = true;
 236           g_config->save();
 237         }
 238         break;
 239     }
 240   }
 241 }
 242
 243 void
 244 MainLoop::handle_screen_switch()
 245 {
 246   while( (next_screen.get() != NULL || nextpop) &&
 247          has_no_pending_fadeout()) {
 248     if(current_screen.get() != NULL) {
 249       current_screen->leave();
 250     }
 251
 252     if(nextpop) {
 253       if(screen_stack.empty()) {
 254         running = false;
 255         break;
 256       }
 257       next_screen.reset(screen_stack.back());
 258       screen_stack.pop_back();
 259     }
 260     if(nextpush && current_screen.get() != NULL) {
 261       screen_stack.push_back(current_screen.release());
 262     }
 263
 264     nextpush = false;
 265     nextpop = false;
 266     speed = 1.0;
 267     Screen* next_screen_ptr = next_screen.release();
 268     next_screen.reset(0);
 269     if(next_screen_ptr)
 270       next_screen_ptr->setup();
 271     current_screen.reset(next_screen_ptr);
 272     screen_fade.reset(NULL);
 273
 274     waiting_threads.wakeup();
 275   }
 276 }
 277
 278 void
 279 MainLoop::run(DrawingContext &context)
 280 {
 281   Uint32 last_ticks = 0;
 282   Uint32 elapsed_ticks = 0;
 283
 284   running = true;
 285   while(running) {
 286
 287     handle_screen_switch();
 288     if(!running || current_screen.get() == NULL)
 289       break;
 290
 291     Uint32 ticks = SDL_GetTicks();
 292     elapsed_ticks += ticks - last_ticks;
 293     last_ticks = ticks;
 294
 295     Uint32 ticks_per_frame = (Uint32) (TICKS_PER_FRAME * g_game_speed);
 296
 297     if (elapsed_ticks > ticks_per_frame*4) {
 298       // when the game loads up or levels are switched the
 299       // elapsed_ticks grows extremely large, so we just ignore those
 300       // large time jumps
 301       elapsed_ticks = 0;
 302     }
 303
 304     if(elapsed_ticks < ticks_per_frame)
 305     {
 306       Uint32 delay_ticks = ticks_per_frame - elapsed_ticks;
 307       SDL_Delay(delay_ticks);
 308       last_ticks += delay_ticks;
 309       elapsed_ticks += delay_ticks;
 310     }
 311
 312     int frames = 0;
 313
 314     while(elapsed_ticks >= ticks_per_frame && frames < MAX_FRAME_SKIP)
 315     {
 316       elapsed_ticks -= ticks_per_frame;
 317       float timestep = 1.0 / LOGICAL_FPS;
 318       real_time += timestep;
 319       timestep *= speed;
 320       game_time += timestep;
 321
 322       process_events();
 323       update_gamelogic(timestep);
 324       frames += 1;
 325     }
 326
 327     draw(context);
 328
 329     sound_manager->update();
 330   }
 331 }
 332
 333 void
 334 MainLoop::take_screenshot()
 335 {
 336   screenshot_requested = true;
 337 }
 338
 339 /* EOF */