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/main.hpp"
  28 #include "supertux/player_status.hpp"
  29 #include "supertux/resources.hpp"
  30 #include "supertux/screen_fade.hpp"
  31 #include "supertux/screen.hpp"
  32 #include "supertux/timer.hpp"
  33 #include "video/drawing_context.hpp"
  34 #include "video/renderer.hpp"
  35
  36 /** ticks (as returned from SDL_GetTicks) per frame */
  37 static const Uint32 TICKS_PER_FRAME = (Uint32) (1000.0 / LOGICAL_FPS);
  38 /** don't skip more than every 2nd frame */
  39 static const int MAX_FRAME_SKIP = 2;
  40
  41 float g_game_speed = 1.0f;
  42
  43 MainLoop* g_main_loop = NULL;
  44
  45 MainLoop::MainLoop() :
  46   speed(1.0),
  47   nextpop(false),
  48   nextpush(false),
  49   fps(0),
  50   screenshot_requested(false)
  51 {
  52   using namespace Scripting;
  53   TimeScheduler::instance = new TimeScheduler();
  54 }
  55
  56 MainLoop::~MainLoop()
  57 {
  58   using namespace Scripting;
  59   delete TimeScheduler::instance;
  60   TimeScheduler::instance = NULL;
  61
  62   for(std::vector<Screen*>::iterator i = screen_stack.begin();
  63       i != screen_stack.end(); ++i) {
  64     delete *i;
  65   }
  66 }
  67
  68 void
  69 MainLoop::push_screen(Screen* screen, ScreenFade* screen_fade)
  70 {
  71   this->next_screen.reset(screen);
  72   this->screen_fade.reset(screen_fade);
  73   nextpush = !nextpop;
  74   nextpop = false;
  75   speed = 1.0f;
  76 }
  77
  78 void
  79 MainLoop::exit_screen(ScreenFade* screen_fade)
  80 {
  81   next_screen.reset(NULL);
  82   this->screen_fade.reset(screen_fade);
  83   nextpop = true;
  84   nextpush = false;
  85 }
  86
  87 void
  88 MainLoop::set_screen_fade(ScreenFade* screen_fade)
  89 {
  90   this->screen_fade.reset(screen_fade);
  91 }
  92
  93 void
  94 MainLoop::quit(ScreenFade* screen_fade)
  95 {
  96   for(std::vector<Screen*>::iterator i = screen_stack.begin();
  97       i != screen_stack.end(); ++i)
  98     delete *i;
  99   screen_stack.clear();
 100
 101   exit_screen(screen_fade);
 102 }
 103
 104 void
 105 MainLoop::set_speed(float speed)
 106 {
 107   this->speed = speed;
 108 }
 109
 110 float
 111 MainLoop::get_speed() const
 112 {
 113   return speed;
 114 }
 115
 116 bool
 117 MainLoop::has_no_pending_fadeout() const
 118 {
 119   return screen_fade.get() == NULL || screen_fade->done();
 120 }
 121
 122 void
 123 MainLoop::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(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);
 129   context.draw_text(small_font, str, Vector(SCREEN_WIDTH - BORDER_X, BORDER_Y + 20), ALIGN_RIGHT, LAYER_HUD);
 130 }
 131
 132 void
 133 MainLoop::draw(DrawingContext& context)
 134 {
 135   static Uint32 fps_ticks = SDL_GetTicks();
 136   static int frame_count = 0;
 137
 138   current_screen->draw(context);
 139   if(Menu::current() != NULL)
 140     Menu::current()->draw(context);
 141   if(screen_fade.get() != NULL)
 142     screen_fade->draw(context);
 143   Console::instance->draw(context);
 144
 145   if(g_config->show_fps)
 146     draw_fps(context, fps);
 147
 148   // if a screenshot was requested, pass request on to drawing_context
 149   if (screenshot_requested) {
 150     context.take_screenshot();
 151     screenshot_requested = false;
 152   }
 153   context.do_drawing();
 154
 155   /* Calculate frames per second */
 156   if(g_config->show_fps)
 157   {
 158     ++frame_count;
 159
 160     if(SDL_GetTicks() - fps_ticks >= 500)
 161     {
 162       fps = (float) frame_count / .5;
 163       frame_count = 0;
 164       fps_ticks = SDL_GetTicks();
 165     }
 166   }
 167 }
 168
 169 void
 170 MainLoop::update_gamelogic(float elapsed_time)
 171 {
 172   Scripting::update_debugger();
 173   Scripting::TimeScheduler::instance->update(game_time);
 174   current_screen->update(elapsed_time);
 175   if (Menu::current() != NULL)
 176     Menu::current()->update();
 177   if(screen_fade.get() != NULL)
 178     screen_fade->update(elapsed_time);
 179   Console::instance->update(elapsed_time);
 180 }
 181
 182 void
 183 MainLoop::process_events()
 184 {
 185   g_main_controller->update();
 186   Uint8* keystate = SDL_GetKeyState(NULL);
 187   SDL_Event event;
 188   while(SDL_PollEvent(&event))
 189   {
 190     g_main_controller->process_event(event);
 191
 192     if(Menu::current() != NULL)
 193       Menu::current()->event(event);
 194
 195     switch(event.type)
 196     {
 197       case SDL_QUIT:
 198         quit();
 199         break;
 200
 201       case SDL_VIDEORESIZE:
 202         Renderer::instance()->resize(event.resize.w, event.resize.h);
 203         Menu::recalc_pos();
 204         break;
 205
 206       case SDL_KEYDOWN:
 207         if (event.key.keysym.sym == SDLK_F10)
 208         {
 209           g_config->show_fps = !g_config->show_fps;
 210         }
 211         if (event.key.keysym.sym == SDLK_F11)
 212         {
 213           g_config->use_fullscreen = !g_config->use_fullscreen;
 214           init_video();
 215           Menu::recalc_pos();
 216         }
 217         else if (event.key.keysym.sym == SDLK_PRINT ||
 218                  event.key.keysym.sym == SDLK_F12)
 219         {
 220           take_screenshot();
 221         }
 222         else if (event.key.keysym.sym == SDLK_F1 &&
 223                  (keystate[SDLK_LCTRL] || keystate[SDLK_RCTRL]) &&
 224                  keystate[SDLK_c])
 225         {
 226           Console::instance->toggle();
 227           g_config->console_enabled = true;
 228           g_config->save();
 229         }
 230         break;
 231     }
 232   }
 233 }
 234
 235 void
 236 MainLoop::handle_screen_switch()
 237 {
 238   while( (next_screen.get() != NULL || nextpop) &&
 239          has_no_pending_fadeout()) {
 240     if(current_screen.get() != NULL) {
 241       current_screen->leave();
 242     }
 243
 244     if(nextpop) {
 245       if(screen_stack.empty()) {
 246         running = false;
 247         break;
 248       }
 249       next_screen.reset(screen_stack.back());
 250       screen_stack.pop_back();
 251     }
 252     if(nextpush && current_screen.get() != NULL) {
 253       screen_stack.push_back(current_screen.release());
 254     }
 255
 256     nextpush = false;
 257     nextpop = false;
 258     speed = 1.0;
 259     Screen* next_screen_ptr = next_screen.release();
 260     next_screen.reset(0);
 261     if(next_screen_ptr)
 262       next_screen_ptr->setup();
 263     current_screen.reset(next_screen_ptr);
 264     screen_fade.reset(NULL);
 265
 266     waiting_threads.wakeup();
 267   }
 268 }
 269
 270 void
 271 MainLoop::run(DrawingContext &context)
 272 {
 273   Uint32 last_ticks = 0;
 274   Uint32 elapsed_ticks = 0;
 275
 276   running = true;
 277   while(running) {
 278
 279     handle_screen_switch();
 280     if(!running || current_screen.get() == NULL)
 281       break;
 282
 283     Uint32 ticks = SDL_GetTicks();
 284     elapsed_ticks += ticks - last_ticks;
 285     last_ticks = ticks;
 286
 287     Uint32 ticks_per_frame = (Uint32) (TICKS_PER_FRAME * g_game_speed);
 288
 289     if (elapsed_ticks > ticks_per_frame*4) {
 290       // when the game loads up or levels are switched the
 291       // elapsed_ticks grows extremely large, so we just ignore those
 292       // large time jumps
 293       elapsed_ticks = 0;
 294     }
 295
 296     if(elapsed_ticks < ticks_per_frame)
 297     {
 298       Uint32 delay_ticks = ticks_per_frame - elapsed_ticks;
 299       SDL_Delay(delay_ticks);
 300       last_ticks += delay_ticks;
 301       elapsed_ticks += delay_ticks;
 302     }
 303
 304     int frames = 0;
 305
 306     while(elapsed_ticks >= ticks_per_frame && frames < MAX_FRAME_SKIP)
 307     {
 308       elapsed_ticks -= ticks_per_frame;
 309       float timestep = 1.0 / LOGICAL_FPS;
 310       real_time += timestep;
 311       timestep *= speed;
 312       game_time += timestep;
 313
 314       process_events();
 315       update_gamelogic(timestep);
 316       frames += 1;
 317     }
 318
 319     draw(context);
 320
 321     sound_manager->update();
 322   }
 323 }
 324
 325 void
 326 MainLoop::take_screenshot()
 327 {
 328   screenshot_requested = true;
 329 }
 330
 331 /* EOF */