allegro_v.cpp

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00001 /* $Id: allegro_v.cpp 18809 2010-01-15 16:41:15Z rubidium $ */
00002 
00003 /*
00004  * This file is part of OpenTTD.
00005  * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
00006  * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
00007  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
00008  */
00009 
00017 #ifdef WITH_ALLEGRO
00018 
00019 #include "../stdafx.h"
00020 #include "../openttd.h"
00021 #include "../gfx_func.h"
00022 #include "../variables.h"
00023 #include "../rev.h"
00024 #include "../blitter/factory.hpp"
00025 #include "../network/network.h"
00026 #include "../core/random_func.hpp"
00027 #include "../functions.h"
00028 #include "allegro_v.h"
00029 #include <allegro.h>
00030 
00031 #ifdef _DEBUG
00032 /* Allegro replaces SEGV/ABRT signals meaning that the debugger will never
00033  * be triggered, so rereplace the signals and make the debugger userful. */
00034 #include <signal.h>
00035 #endif
00036 
00037 static FVideoDriver_Allegro iFVideoDriver_Allegro;
00038 
00039 static BITMAP *_allegro_screen;
00040 
00041 #define MAX_DIRTY_RECTS 100
00042 static PointDimension _dirty_rects[MAX_DIRTY_RECTS];
00043 static int _num_dirty_rects;
00044 
00045 void VideoDriver_Allegro::MakeDirty(int left, int top, int width, int height)
00046 {
00047   if (_num_dirty_rects < MAX_DIRTY_RECTS) {
00048     _dirty_rects[_num_dirty_rects].x = left;
00049     _dirty_rects[_num_dirty_rects].y = top;
00050     _dirty_rects[_num_dirty_rects].width = width;
00051     _dirty_rects[_num_dirty_rects].height = height;
00052   }
00053   _num_dirty_rects++;
00054 }
00055 
00056 static void DrawSurfaceToScreen()
00057 {
00058   int n = _num_dirty_rects;
00059   if (n == 0) return;
00060 
00061   _num_dirty_rects = 0;
00062   if (n > MAX_DIRTY_RECTS) {
00063     blit(_allegro_screen, screen, 0, 0, 0, 0, _allegro_screen->w, _allegro_screen->h);
00064     return;
00065   }
00066 
00067   for (int i = 0; i < n; i++) {
00068     blit(_allegro_screen, screen, _dirty_rects[i].x, _dirty_rects[i].y, _dirty_rects[i].x, _dirty_rects[i].y, _dirty_rects[i].width, _dirty_rects[i].height);
00069   }
00070 }
00071 
00072 
00073 static void UpdatePalette(uint start, uint count)
00074 {
00075   static PALETTE pal;
00076 
00077   uint end = start + count;
00078   for (uint i = start; i != end; i++) {
00079     pal[i].r = _cur_palette[i].r / 4;
00080     pal[i].g = _cur_palette[i].g / 4;
00081     pal[i].b = _cur_palette[i].b / 4;
00082     pal[i].filler = 0;
00083   }
00084 
00085   set_palette_range(pal, start, end - 1, 1);
00086 }
00087 
00088 static void InitPalette()
00089 {
00090   UpdatePalette(0, 256);
00091 }
00092 
00093 static void CheckPaletteAnim()
00094 {
00095   if (_pal_count_dirty != 0) {
00096     Blitter *blitter = BlitterFactoryBase::GetCurrentBlitter();
00097 
00098     switch (blitter->UsePaletteAnimation()) {
00099       case Blitter::PALETTE_ANIMATION_VIDEO_BACKEND:
00100         UpdatePalette(_pal_first_dirty, _pal_count_dirty);
00101         break;
00102 
00103       case Blitter::PALETTE_ANIMATION_BLITTER:
00104         blitter->PaletteAnimate(_pal_first_dirty, _pal_count_dirty);
00105         break;
00106 
00107       case Blitter::PALETTE_ANIMATION_NONE:
00108         break;
00109 
00110       default:
00111         NOT_REACHED();
00112     }
00113     _pal_count_dirty = 0;
00114   }
00115 }
00116 
00117 static const Dimension default_resolutions[] = {
00118   { 640,  480},
00119   { 800,  600},
00120   {1024,  768},
00121   {1152,  864},
00122   {1280,  800},
00123   {1280,  960},
00124   {1280, 1024},
00125   {1400, 1050},
00126   {1600, 1200},
00127   {1680, 1050},
00128   {1920, 1200}
00129 };
00130 
00131 static void GetVideoModes()
00132 {
00133   /* Need to set a gfx_mode as there is NO other way to autodetect for
00134    * cards ourselves... and we need a card to get the modes. */
00135   set_gfx_mode(_fullscreen ? GFX_AUTODETECT_FULLSCREEN : GFX_AUTODETECT_WINDOWED, 640, 480, 0, 0);
00136 
00137   GFX_MODE_LIST *mode_list = get_gfx_mode_list(gfx_driver->id);
00138   if (mode_list == NULL) {
00139     memcpy(_resolutions, default_resolutions, sizeof(default_resolutions));
00140     _num_resolutions = lengthof(default_resolutions);
00141     return;
00142   }
00143 
00144   GFX_MODE *modes = mode_list->mode;
00145 
00146   int n = 0;
00147   for (int i = 0; modes[i].bpp != 0; i++) {
00148     uint w = modes[i].width;
00149     uint h = modes[i].height;
00150     if (w >= 640 && h >= 480) {
00151       int j;
00152       for (j = 0; j < n; j++) {
00153         if (_resolutions[j].width == w && _resolutions[j].height == h) break;
00154       }
00155 
00156       if (j == n) {
00157         _resolutions[j].width  = w;
00158         _resolutions[j].height = h;
00159         if (++n == lengthof(_resolutions)) break;
00160       }
00161     }
00162   }
00163   _num_resolutions = n;
00164   SortResolutions(_num_resolutions);
00165 
00166   destroy_gfx_mode_list(mode_list);
00167 }
00168 
00169 static void GetAvailableVideoMode(uint *w, uint *h)
00170 {
00171   /* No video modes, so just try it and see where it ends */
00172   if (_num_resolutions == 0) return;
00173 
00174   /* is the wanted mode among the available modes? */
00175   for (int i = 0; i != _num_resolutions; i++) {
00176     if (*w == _resolutions[i].width && *h == _resolutions[i].height) return;
00177   }
00178 
00179   /* use the closest possible resolution */
00180   int best = 0;
00181   uint delta = Delta(_resolutions[0].width, *w) * Delta(_resolutions[0].height, *h);
00182   for (int i = 1; i != _num_resolutions; ++i) {
00183     uint newdelta = Delta(_resolutions[i].width, *w) * Delta(_resolutions[i].height, *h);
00184     if (newdelta < delta) {
00185       best = i;
00186       delta = newdelta;
00187     }
00188   }
00189   *w = _resolutions[best].width;
00190   *h = _resolutions[best].height;
00191 }
00192 
00193 static bool CreateMainSurface(uint w, uint h)
00194 {
00195   int bpp = BlitterFactoryBase::GetCurrentBlitter()->GetScreenDepth();
00196   if (bpp == 0) usererror("Can't use a blitter that blits 0 bpp for normal visuals");
00197   set_color_depth(bpp);
00198 
00199   GetAvailableVideoMode(&w, &h);
00200   if (set_gfx_mode(_fullscreen ? GFX_AUTODETECT_FULLSCREEN : GFX_AUTODETECT_WINDOWED, w, h, 0, 0) != 0) {
00201     DEBUG(driver, 0, "Allegro: Couldn't allocate a window to draw on '%s'", allegro_error);
00202     return false;
00203   }
00204 
00205   /* The size of the screen might be bigger than the part we can actually draw on!
00206    * So calculate the size based on the top, bottom, left and right */
00207   _allegro_screen = create_bitmap_ex(bpp, screen->cr - screen->cl, screen->cb - screen->ct);
00208   _screen.width = _allegro_screen->w;
00209   _screen.height = _allegro_screen->h;
00210   _screen.pitch = ((byte*)screen->line[1] - (byte*)screen->line[0]) / (bpp / 8);
00211   _screen.dst_ptr = _allegro_screen->line[0];
00212 
00213   /* Initialise the screen so we don't blit garbage to the screen */
00214   memset(_screen.dst_ptr, 0, _screen.height * _screen.pitch);
00215 
00216   /* Set the mouse at the place where we expect it */
00217   poll_mouse();
00218   _cursor.pos.x = mouse_x;
00219   _cursor.pos.y = mouse_y;
00220 
00221   BlitterFactoryBase::GetCurrentBlitter()->PostResize();
00222 
00223   InitPalette();
00224 
00225   char caption[32];
00226   snprintf(caption, sizeof(caption), "OpenTTD %s", _openttd_revision);
00227   set_window_title(caption);
00228 
00229   GameSizeChanged();
00230 
00231   return true;
00232 }
00233 
00234 struct VkMapping {
00235   uint16 vk_from;
00236   byte vk_count;
00237   byte map_to;
00238 };
00239 
00240 #define AS(x, z) {x, 0, z}
00241 #define AM(x, y, z, w) {x, y - x, z}
00242 
00243 static const VkMapping _vk_mapping[] = {
00244   /* Pageup stuff + up/down */
00245   AM(KEY_PGUP, KEY_PGDN, WKC_PAGEUP, WKC_PAGEDOWN),
00246   AS(KEY_UP,     WKC_UP),
00247   AS(KEY_DOWN,   WKC_DOWN),
00248   AS(KEY_LEFT,   WKC_LEFT),
00249   AS(KEY_RIGHT,  WKC_RIGHT),
00250 
00251   AS(KEY_HOME,   WKC_HOME),
00252   AS(KEY_END,    WKC_END),
00253 
00254   AS(KEY_INSERT, WKC_INSERT),
00255   AS(KEY_DEL,    WKC_DELETE),
00256 
00257   /* Map letters & digits */
00258   AM(KEY_A, KEY_Z, 'A', 'Z'),
00259   AM(KEY_0, KEY_9, '0', '9'),
00260 
00261   AS(KEY_ESC,       WKC_ESC),
00262   AS(KEY_PAUSE,     WKC_PAUSE),
00263   AS(KEY_BACKSPACE, WKC_BACKSPACE),
00264 
00265   AS(KEY_SPACE,     WKC_SPACE),
00266   AS(KEY_ENTER,     WKC_RETURN),
00267   AS(KEY_TAB,       WKC_TAB),
00268 
00269   /* Function keys */
00270   AM(KEY_F1, KEY_F12, WKC_F1, WKC_F12),
00271 
00272   /* Numeric part. */
00273   AM(KEY_0_PAD, KEY_9_PAD, '0', '9'),
00274   AS(KEY_SLASH_PAD,   WKC_NUM_DIV),
00275   AS(KEY_ASTERISK,    WKC_NUM_MUL),
00276   AS(KEY_MINUS_PAD,   WKC_NUM_MINUS),
00277   AS(KEY_PLUS_PAD,    WKC_NUM_PLUS),
00278   AS(KEY_ENTER_PAD,   WKC_NUM_ENTER),
00279   AS(KEY_DEL_PAD,     WKC_DELETE),
00280 
00281   /* Other non-letter keys */
00282   AS(KEY_SLASH,        WKC_SLASH),
00283   AS(KEY_SEMICOLON,    WKC_SEMICOLON),
00284   AS(KEY_EQUALS,       WKC_EQUALS),
00285   AS(KEY_OPENBRACE,    WKC_L_BRACKET),
00286   AS(KEY_BACKSLASH,    WKC_BACKSLASH),
00287   AS(KEY_CLOSEBRACE,   WKC_R_BRACKET),
00288 
00289   AS(KEY_QUOTE,   WKC_SINGLEQUOTE),
00290   AS(KEY_COMMA,   WKC_COMMA),
00291   AS(KEY_MINUS,   WKC_MINUS),
00292   AS(KEY_STOP,    WKC_PERIOD),
00293   AS(KEY_TILDE,   WKC_BACKQUOTE),
00294 };
00295 
00296 static uint32 ConvertAllegroKeyIntoMy()
00297 {
00298   int scancode;
00299   int unicode = ureadkey(&scancode);
00300 
00301   const VkMapping *map;
00302   uint key = 0;
00303 
00304   for (map = _vk_mapping; map != endof(_vk_mapping); ++map) {
00305     if ((uint)(scancode - map->vk_from) <= map->vk_count) {
00306       key = scancode - map->vk_from + map->map_to;
00307       break;
00308     }
00309   }
00310 
00311   if (key_shifts & KB_SHIFT_FLAG) key |= WKC_SHIFT;
00312   if (key_shifts & KB_CTRL_FLAG)  key |= WKC_CTRL;
00313   if (key_shifts & KB_ALT_FLAG)   key |= WKC_ALT;
00314 #if 0
00315   DEBUG(driver, 0, "Scancode character pressed %u", scancode);
00316   DEBUG(driver, 0, "Unicode character pressed %u", unicode);
00317 #endif
00318   return (key << 16) + unicode;
00319 }
00320 
00321 enum {
00322   LEFT_BUTTON,
00323   RIGHT_BUTTON,
00324 };
00325 
00326 static void PollEvent()
00327 {
00328   poll_mouse();
00329 
00330   bool mouse_action = false;
00331 
00332   /* Mouse buttons */
00333   static int prev_button_state;
00334   if (prev_button_state != mouse_b) {
00335     uint diff = prev_button_state ^ mouse_b;
00336     while (diff != 0) {
00337       int button = FindFirstBit(diff);
00338       ClrBit(diff, button);
00339       if (HasBit(mouse_b, button)) {
00340         /* Pressed mouse button */
00341         if (_rightclick_emulate && (key_shifts & KB_CTRL_FLAG)) {
00342           button = RIGHT_BUTTON;
00343           ClrBit(diff, RIGHT_BUTTON);
00344         }
00345         switch (button) {
00346           case LEFT_BUTTON:
00347             _left_button_down = true;
00348             break;
00349 
00350           case RIGHT_BUTTON:
00351             _right_button_down = true;
00352             _right_button_clicked = true;
00353             break;
00354 
00355           default:
00356             /* ignore rest */
00357             break;
00358         }
00359       } else {
00360         /* Released mouse button */
00361         if (_rightclick_emulate) {
00362           _right_button_down = false;
00363           _left_button_down = false;
00364           _left_button_clicked = false;
00365         } else if (button == LEFT_BUTTON) {
00366           _left_button_down = false;
00367           _left_button_clicked = false;
00368         } else if (button == RIGHT_BUTTON) {
00369           _right_button_down = false;
00370         }
00371       }
00372     }
00373     prev_button_state = mouse_b;
00374     mouse_action = true;
00375   }
00376 
00377   /* Mouse movement */
00378   int dx = mouse_x - _cursor.pos.x;
00379   int dy = mouse_y - _cursor.pos.y;
00380   if (dx != 0 || dy != 0) {
00381     if (_cursor.fix_at) {
00382       _cursor.delta.x = dx;
00383       _cursor.delta.y = dy;
00384       position_mouse(_cursor.pos.x, _cursor.pos.y);
00385     } else {
00386       _cursor.delta.x = dx;
00387       _cursor.delta.y = dy;
00388       _cursor.pos.x = mouse_x;
00389       _cursor.pos.y = mouse_y;
00390       _cursor.dirty = true;
00391     }
00392     mouse_action = true;
00393   }
00394 
00395   static int prev_mouse_z = 0;
00396   if (prev_mouse_z != mouse_z) {
00397     _cursor.wheel = (prev_mouse_z - mouse_z) < 0 ? -1 : 1;
00398     prev_mouse_z = mouse_z;
00399     mouse_action = true;
00400   }
00401 
00402   if (mouse_action) HandleMouseEvents();
00403 
00404   poll_keyboard();
00405   if ((key_shifts & KB_ALT_FLAG) && (key[KEY_ENTER] || key[KEY_F])) {
00406     ToggleFullScreen(!_fullscreen);
00407   } else if (keypressed()) {
00408     HandleKeypress(ConvertAllegroKeyIntoMy());
00409   }
00410 }
00411 
00414 int _allegro_instance_count = 0;
00415 
00416 const char *VideoDriver_Allegro::Start(const char * const *parm)
00417 {
00418   if (_allegro_instance_count == 0 && install_allegro(SYSTEM_AUTODETECT, &errno, NULL)) {
00419     DEBUG(driver, 0, "allegro: install_allegro failed '%s'", allegro_error);
00420     return "Failed to set up Allegro";
00421   }
00422   _allegro_instance_count++;
00423 
00424   install_timer();
00425   install_mouse();
00426   install_keyboard();
00427 
00428 #if defined _DEBUG
00429 /* Allegro replaces SEGV/ABRT signals meaning that the debugger will never
00430  * be triggered, so rereplace the signals and make the debugger userful. */
00431   signal(SIGABRT, NULL);
00432   signal(SIGSEGV, NULL);
00433 #endif
00434 
00435 #if defined(DOS)
00436   /* Force DOS builds to ALWAYS use full screen as
00437    * it can't do windowed. */
00438   _fullscreen = true;
00439 #endif
00440 
00441   GetVideoModes();
00442   if (!CreateMainSurface(_cur_resolution.width, _cur_resolution.height)) {
00443     return "Failed to set up Allegro video";
00444   }
00445   MarkWholeScreenDirty();
00446   set_close_button_callback(HandleExitGameRequest);
00447 
00448   return NULL;
00449 }
00450 
00451 void VideoDriver_Allegro::Stop()
00452 {
00453   if (--_allegro_instance_count == 0) allegro_exit();
00454 }
00455 
00456 #if defined(UNIX) || defined(__OS2__) || defined(PSP) || defined(DOS)
00457 # include <sys/time.h> /* gettimeofday */
00458 
00459 static uint32 GetTime()
00460 {
00461   struct timeval tim;
00462 
00463   gettimeofday(&tim, NULL);
00464   return tim.tv_usec / 1000 + tim.tv_sec * 1000;
00465 }
00466 #else
00467 static uint32 GetTime()
00468 {
00469   return GetTickCount();
00470 }
00471 #endif
00472 
00473 
00474 void VideoDriver_Allegro::MainLoop()
00475 {
00476   uint32 cur_ticks = GetTime();
00477   uint32 last_cur_ticks = cur_ticks;
00478   uint32 next_tick = cur_ticks + 30;
00479   uint32 pal_tick = 0;
00480 
00481   for (;;) {
00482     uint32 prev_cur_ticks = cur_ticks; // to check for wrapping
00483     InteractiveRandom(); // randomness
00484 
00485     PollEvent();
00486     if (_exit_game) return;
00487 
00488 #if defined(_DEBUG)
00489     if (_shift_pressed)
00490 #else
00491     /* Speedup when pressing tab, except when using ALT+TAB
00492      * to switch to another application */
00493     if (key[KEY_TAB] && (key_shifts & KB_ALT_FLAG) == 0)
00494 #endif
00495     {
00496       if (!_networking && _game_mode != GM_MENU) _fast_forward |= 2;
00497     } else if (_fast_forward & 2) {
00498       _fast_forward = 0;
00499     }
00500 
00501     cur_ticks = GetTime();
00502     if (cur_ticks >= next_tick || (_fast_forward && !_pause_mode) || cur_ticks < prev_cur_ticks) {
00503       _realtime_tick += cur_ticks - last_cur_ticks;
00504       last_cur_ticks = cur_ticks;
00505       next_tick = cur_ticks + 30;
00506 
00507       bool old_ctrl_pressed = _ctrl_pressed;
00508 
00509       _ctrl_pressed  = !!(key_shifts & KB_CTRL_FLAG);
00510       _shift_pressed = !!(key_shifts & KB_SHIFT_FLAG);
00511 
00512       /* determine which directional keys are down */
00513       _dirkeys =
00514         (key[KEY_LEFT]  ? 1 : 0) |
00515         (key[KEY_UP]    ? 2 : 0) |
00516         (key[KEY_RIGHT] ? 4 : 0) |
00517         (key[KEY_DOWN]  ? 8 : 0);
00518 
00519       if (old_ctrl_pressed != _ctrl_pressed) HandleCtrlChanged();
00520 
00521       GameLoop();
00522 
00523       UpdateWindows();
00524       if (++pal_tick > 4) {
00525         CheckPaletteAnim();
00526         pal_tick = 1;
00527       }
00528       DrawSurfaceToScreen();
00529     } else {
00530       CSleep(1);
00531       NetworkDrawChatMessage();
00532       DrawMouseCursor();
00533       DrawSurfaceToScreen();
00534     }
00535   }
00536 }
00537 
00538 bool VideoDriver_Allegro::ChangeResolution(int w, int h)
00539 {
00540   return CreateMainSurface(w, h);
00541 }
00542 
00543 bool VideoDriver_Allegro::ToggleFullscreen(bool fullscreen)
00544 {
00545 #ifdef DOS
00546   return false;
00547 #else
00548   _fullscreen = fullscreen;
00549   GetVideoModes(); // get the list of available video modes
00550   if (_num_resolutions == 0 || !this->ChangeResolution(_cur_resolution.width, _cur_resolution.height)) {
00551     /* switching resolution failed, put back full_screen to original status */
00552     _fullscreen ^= true;
00553     return false;
00554   }
00555   return true;
00556 #endif
00557 }
00558 
00559 #endif /* WITH_ALLEGRO */

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