src/mainloop.cpp

   1 //  $Id$
   2 //
   3 //  SuperTux
   4 //  Copyright (C) 2006 Matthias Braun <matze@braunis.de>
   5 //
   6 //  This program is free software; you can redistribute it and/or
   7 //  modify it under the terms of the GNU General Public License
   8 //  as published by the Free Software Foundation; either version 2
   9 //  of the License, or (at your option) any later version.
  10 //
  11 //  This program is distributed in the hope that it will be useful,
  12 //  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 //  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 //  GNU General Public License for more details.
  15 //
  16 //  You should have received a copy of the GNU General Public License
  17 //  along with this program; if not, write to the Free Software
  18 //  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  19 #include <config.h>
  20
  21 #include "mainloop.hpp"
  22
  23 #include <stdlib.h>
  24 #include <SDL.h>
  25 #include "video/drawing_context.hpp"
  26 #include "control/joystickkeyboardcontroller.hpp"
  27 #include "gui/menu.hpp"
  28 #include "audio/sound_manager.hpp"
  29 #include "scripting/time_scheduler.hpp"
  30 #include "scripting/squirrel_util.hpp"
  31 #include "gameconfig.hpp"
  32 #include "constants.hpp"
  33 #include "main.hpp"
  34 #include "resources.hpp"
  35 #include "screen.hpp"
  36 #include "screen_fade.hpp"
  37 #include "timer.hpp"
  38 #include "player_status.hpp"
  39 #include "video/renderer.hpp"
  40 #include "random_generator.hpp"
  41
  42 /** ticks (as returned from SDL_GetTicks) per frame */
  43 static const Uint32 TICKS_PER_FRAME = (Uint32) (1000.0 / LOGICAL_FPS);
  44 /** don't skip more than every 2nd frame */
  45 static const int MAX_FRAME_SKIP = 2;
  46
  47 float game_speed = 1.0f;
  48
  49 MainLoop* main_loop = NULL;
  50
  51 MainLoop::MainLoop()
  52   : speed(1.0), nextpop(false), nextpush(false), fps(0), screenshot_requested(false)
  53 {
  54   using namespace Scripting;
  55   TimeScheduler::instance = new TimeScheduler();
  56 }
  57
  58 MainLoop::~MainLoop()
  59 {
  60   using namespace Scripting;
  61   delete TimeScheduler::instance;
  62   TimeScheduler::instance = NULL;
  63
  64   for(std::vector<Screen*>::iterator i = screen_stack.begin();
  65       i != screen_stack.end(); ++i) {
  66     delete *i;
  67   }
  68 }
  69
  70 void
  71 MainLoop::push_screen(Screen* screen, ScreenFade* screen_fade)
  72 {
  73   this->next_screen.reset(screen);
  74   this->screen_fade.reset(screen_fade);
  75   nextpush = !nextpop;
  76   nextpop = false;
  77   speed = 1.0f;
  78 }
  79
  80 void
  81 MainLoop::exit_screen(ScreenFade* screen_fade)
  82 {
  83   next_screen.reset(NULL);
  84   this->screen_fade.reset(screen_fade);
  85   nextpop = true;
  86   nextpush = false;
  87 }
  88
  89 void
  90 MainLoop::set_screen_fade(ScreenFade* screen_fade)
  91 {
  92   this->screen_fade.reset(screen_fade);
  93 }
  94
  95 void
  96 MainLoop::quit(ScreenFade* screen_fade)
  97 {
  98   for(std::vector<Screen*>::iterator i = screen_stack.begin();
  99           i != screen_stack.end(); ++i)
 100     delete *i;
 101   screen_stack.clear();
 102
 103   exit_screen(screen_fade);
 104 }
 105
 106 void
 107 MainLoop::set_speed(float speed)
 108 {
 109   this->speed = speed;
 110 }
 111
 112 float
 113 MainLoop::get_speed() const
 114 {
 115   return speed;
 116 }
 117
 118 void
 119 MainLoop::draw_fps(DrawingContext& context, float fps_fps)
 120 {
 121   char str[60];
 122   snprintf(str, sizeof(str), "%3.1f", fps_fps);
 123   const char* fpstext = "FPS";
 124   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);
 125   context.draw_text(small_font, str, Vector(SCREEN_WIDTH - BORDER_X, BORDER_Y + 20), ALIGN_RIGHT, LAYER_HUD);
 126 }
 127
 128 void
 129 MainLoop::draw(DrawingContext& context)
 130 {
 131   static Uint32 fps_ticks = SDL_GetTicks();
 132   static int frame_count = 0;
 133
 134   current_screen->draw(context);
 135   if(Menu::current() != NULL)
 136     Menu::current()->draw(context);
 137   if(screen_fade.get() != NULL)
 138     screen_fade->draw(context);
 139   Console::instance->draw(context);
 140
 141   if(config->show_fps)
 142     draw_fps(context, fps);
 143
 144   // if a screenshot was requested, pass request on to drawing_context
 145   if (screenshot_requested) {
 146     context.take_screenshot();
 147     screenshot_requested = false;
 148   }
 149   context.do_drawing();
 150
 151   /* Calculate frames per second */
 152   if(config->show_fps)
 153   {
 154     ++frame_count;
 155
 156     if(SDL_GetTicks() - fps_ticks >= 500)
 157     {
 158       fps = (float) frame_count / .5;
 159       frame_count = 0;
 160       fps_ticks = SDL_GetTicks();
 161     }
 162   }
 163 }
 164
 165 void
 166 MainLoop::update_gamelogic(float elapsed_time)
 167 {
 168   Scripting::update_debugger();
 169   Scripting::TimeScheduler::instance->update(game_time);
 170   current_screen->update(elapsed_time);
 171   if (Menu::current() != NULL)
 172         Menu::current()->update();
 173   if(screen_fade.get() != NULL)
 174     screen_fade->update(elapsed_time);
 175   Console::instance->update(elapsed_time);
 176 }
 177
 178 void
 179 MainLoop::process_events()
 180 {
 181   main_controller->update();
 182   Uint8* keystate = SDL_GetKeyState(NULL);
 183   SDL_Event event;
 184   while(SDL_PollEvent(&event))
 185     {
 186       main_controller->process_event(event);
 187
 188       if(Menu::current() != NULL)
 189         Menu::current()->event(event);
 190
 191       switch(event.type)
 192         {
 193           case SDL_QUIT:
 194             quit();
 195             break;
 196
 197           case SDL_VIDEORESIZE:
 198             Renderer::instance()->resize(event.resize.w, event.resize.h);
 199             Menu::recalc_pos();
 200             break;
 201
 202           case SDL_KEYDOWN:
 203             if (event.key.keysym.sym == SDLK_F10)
 204               {
 205                 config->show_fps = !config->show_fps;
 206               }
 207             if (event.key.keysym.sym == SDLK_F11)
 208               {
 209                 config->use_fullscreen = !config->use_fullscreen;
 210                 init_video();
 211                 Menu::recalc_pos();
 212               }
 213             else if (event.key.keysym.sym == SDLK_PRINT ||
 214                      event.key.keysym.sym == SDLK_F12)
 215               {
 216                 take_screenshot();
 217               }
 218             else if (event.key.keysym.sym == SDLK_F1 &&
 219                      (keystate[SDLK_LCTRL] || keystate[SDLK_RCTRL]) &&
 220                      keystate[SDLK_c])
 221               {
 222                 Console::instance->toggle();
 223                 config->console_enabled = true;
 224                 config->save();
 225               }
 226             break;
 227         }
 228     }
 229 }
 230
 231 void
 232 MainLoop::handle_screen_switch()
 233 {
 234   while( (next_screen.get() != NULL || nextpop) &&
 235       (screen_fade.get() == NULL || screen_fade->done())) {
 236     if(current_screen.get() != NULL) {
 237       current_screen->leave();
 238     }
 239
 240     if(nextpop) {
 241       if(screen_stack.empty()) {
 242         running = false;
 243         break;
 244       }
 245       next_screen.reset(screen_stack.back());
 246       screen_stack.pop_back();
 247     }
 248     if(nextpush && current_screen.get() != NULL) {
 249       screen_stack.push_back(current_screen.release());
 250     }
 251
 252     nextpush = false;
 253     nextpop = false;
 254     speed = 1.0;
 255     Screen* next_screen_ptr = next_screen.release();
 256     next_screen.reset(0);
 257     if(next_screen_ptr)
 258       next_screen_ptr->setup();
 259     current_screen.reset(next_screen_ptr);
 260     screen_fade.reset(NULL);
 261
 262     waiting_threads.wakeup();
 263   }
 264 }
 265
 266 void
 267 MainLoop::run(DrawingContext &context)
 268 {
 269   Uint32 last_ticks = 0;
 270   Uint32 elapsed_ticks = 0;
 271
 272   running = true;
 273   while(running) {
 274
 275     handle_screen_switch();
 276     if(!running || current_screen.get() == NULL)
 277       break;
 278
 279     Uint32 ticks = SDL_GetTicks();
 280     elapsed_ticks += ticks - last_ticks;
 281     last_ticks = ticks;
 282
 283     Uint32 ticks_per_frame = (Uint32) (TICKS_PER_FRAME * game_speed);
 284
 285     if (elapsed_ticks > ticks_per_frame*4) {
 286       // when the game loads up or levels are switched the
 287       // elapsed_ticks grows extremely large, so we just ignore those
 288       // large time jumps
 289       elapsed_ticks = 0;
 290     }
 291
 292     int frames = 0;
 293
 294     if (elapsed_ticks > ticks_per_frame)
 295       {
 296         while(elapsed_ticks > ticks_per_frame && frames < MAX_FRAME_SKIP)
 297           {
 298             elapsed_ticks -= ticks_per_frame;
 299             float timestep = 1.0 / LOGICAL_FPS;
 300             real_time += timestep;
 301             timestep *= speed;
 302             game_time += timestep;
 303
 304             process_events();
 305             update_gamelogic(timestep);
 306             frames += 1;
 307           }
 308
 309         draw(context);
 310       }
 311
 312     sound_manager->update();
 313
 314     SDL_Delay(0);
 315   }
 316 }
 317
 318 void
 319 MainLoop::take_screenshot()
 320 {
 321   screenshot_requested = true;
 322 }
 323