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 "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 MainLoop* g_main_loop = NULL;
  46
  47 MainLoop::MainLoop() :
  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 MainLoop::~MainLoop()
  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 MainLoop::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 MainLoop::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 MainLoop::set_screen_fade(ScreenFade* screen_fade)
  98 {
  99   this->screen_fade.reset(screen_fade);
 100 }
 101
 102 void
 103 MainLoop::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 MainLoop::set_speed(float speed)
 115 {
 116   this->speed = speed;
 117 }
 118
 119 float
 120 MainLoop::get_speed() const
 121 {
 122   return speed;
 123 }
 124
 125 bool
 126 MainLoop::has_no_pending_fadeout() const
 127 {
 128   return screen_fade.get() == NULL || screen_fade->done();
 129 }
 130
 131 void
 132 MainLoop::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(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);
 138   context.draw_text(small_font, str, Vector(SCREEN_WIDTH - BORDER_X, BORDER_Y + 20), ALIGN_RIGHT, LAYER_HUD);
 139 }
 140
 141 void
 142 MainLoop::draw(DrawingContext& context)
 143 {
 144   static Uint32 fps_ticks = SDL_GetTicks();
 145   static int frame_count = 0;
 146
 147   current_screen->draw(context);
 148   if(MenuManager2::current() != NULL)
 149     MenuManager2::current()->draw(context);
 150   if(screen_fade.get() != NULL)
 151     screen_fade->draw(context);
 152   Console::instance->draw(context);
 153
 154   if(g_config->show_fps)
 155     draw_fps(context, fps);
 156
 157   // if a screenshot was requested, pass request on to drawing_context
 158   if (screenshot_requested) {
 159     context.take_screenshot();
 160     screenshot_requested = false;
 161   }
 162   context.do_drawing();
 163
 164   /* Calculate frames per second */
 165   if(g_config->show_fps)
 166   {
 167     ++frame_count;
 168
 169     if(SDL_GetTicks() - fps_ticks >= 500)
 170     {
 171       fps = (float) frame_count / .5;
 172       frame_count = 0;
 173       fps_ticks = SDL_GetTicks();
 174     }
 175   }
 176 }
 177
 178 void
 179 MainLoop::update_gamelogic(float elapsed_time)
 180 {
 181   Scripting::update_debugger();
 182   Scripting::TimeScheduler::instance->update(game_time);
 183   current_screen->update(elapsed_time);
 184   if (MenuManager2::current() != NULL)
 185     MenuManager2::current()->update();
 186   if(screen_fade.get() != NULL)
 187     screen_fade->update(elapsed_time);
 188   Console::instance->update(elapsed_time);
 189 }
 190
 191 void
 192 MainLoop::process_events()
 193 {
 194   g_main_controller->update();
 195   Uint8* keystate = SDL_GetKeyState(NULL);
 196   SDL_Event event;
 197   while(SDL_PollEvent(&event))
 198   {
 199     g_main_controller->process_event(event);
 200
 201     if(MenuManager2::current() != NULL)
 202       MenuManager2::current()->event(event);
 203
 204     switch(event.type)
 205     {
 206       case SDL_QUIT:
 207         quit();
 208         break;
 209
 210       case SDL_VIDEORESIZE:
 211         Renderer::instance()->resize(event.resize.w, event.resize.h);
 212         MenuManager2::recalc_pos();
 213         break;
 214
 215       case SDL_KEYDOWN:
 216         if (event.key.keysym.sym == SDLK_F10)
 217         {
 218           g_config->show_fps = !g_config->show_fps;
 219         }
 220         if (event.key.keysym.sym == SDLK_F11)
 221         {
 222           g_config->use_fullscreen = !g_config->use_fullscreen;
 223           init_video();
 224           MenuManager2::recalc_pos();
 225         }
 226         else if (event.key.keysym.sym == SDLK_PRINT ||
 227                  event.key.keysym.sym == SDLK_F12)
 228         {
 229           take_screenshot();
 230         }
 231         else if (event.key.keysym.sym == SDLK_F1 &&
 232                  (keystate[SDLK_LCTRL] || keystate[SDLK_RCTRL]) &&
 233                  keystate[SDLK_c])
 234         {
 235           Console::instance->toggle();
 236           g_config->console_enabled = true;
 237           g_config->save();
 238         }
 239         break;
 240     }
 241   }
 242 }
 243
 244 void
 245 MainLoop::handle_screen_switch()
 246 {
 247   while( (next_screen.get() != NULL || nextpop) &&
 248          has_no_pending_fadeout()) {
 249     if(current_screen.get() != NULL) {
 250       current_screen->leave();
 251     }
 252
 253     if(nextpop) {
 254       if(screen_stack.empty()) {
 255         running = false;
 256         break;
 257       }
 258       next_screen.reset(screen_stack.back());
 259       screen_stack.pop_back();
 260     }
 261     if(nextpush && current_screen.get() != NULL) {
 262       screen_stack.push_back(current_screen.release());
 263     }
 264
 265     nextpush = false;
 266     nextpop = false;
 267     speed = 1.0;
 268     Screen* next_screen_ptr = next_screen.release();
 269     next_screen.reset(0);
 270     if(next_screen_ptr)
 271       next_screen_ptr->setup();
 272     current_screen.reset(next_screen_ptr);
 273     screen_fade.reset(NULL);
 274
 275     waiting_threads.wakeup();
 276   }
 277 }
 278
 279 void
 280 MainLoop::run(DrawingContext &context)
 281 {
 282   Uint32 last_ticks = 0;
 283   Uint32 elapsed_ticks = 0;
 284
 285   running = true;
 286   while(running) {
 287
 288     handle_screen_switch();
 289     if(!running || current_screen.get() == NULL)
 290       break;
 291
 292     Uint32 ticks = SDL_GetTicks();
 293     elapsed_ticks += ticks - last_ticks;
 294     last_ticks = ticks;
 295
 296     Uint32 ticks_per_frame = (Uint32) (TICKS_PER_FRAME * g_game_speed);
 297
 298     if (elapsed_ticks > ticks_per_frame*4) {
 299       // when the game loads up or levels are switched the
 300       // elapsed_ticks grows extremely large, so we just ignore those
 301       // large time jumps
 302       elapsed_ticks = 0;
 303     }
 304
 305     if(elapsed_ticks < ticks_per_frame)
 306     {
 307       Uint32 delay_ticks = ticks_per_frame - elapsed_ticks;
 308       SDL_Delay(delay_ticks);
 309       last_ticks += delay_ticks;
 310       elapsed_ticks += delay_ticks;
 311     }
 312
 313     int frames = 0;
 314
 315     while(elapsed_ticks >= ticks_per_frame && frames < MAX_FRAME_SKIP)
 316     {
 317       elapsed_ticks -= ticks_per_frame;
 318       float timestep = 1.0 / LOGICAL_FPS;
 319       real_time += timestep;
 320       timestep *= speed;
 321       game_time += timestep;
 322
 323       process_events();
 324       update_gamelogic(timestep);
 325       frames += 1;
 326     }
 327
 328     draw(context);
 329
 330     sound_manager->update();
 331   }
 332 }
 333
 334 void
 335 MainLoop::take_screenshot()
 336 {
 337   screenshot_requested = true;
 338 }
 339
 340 /* EOF */