SDLBackend.cpp

   1 /*
   2  *  SDLBackend.cpp
   3  *  openc2e
   4  *
   5  *  Created by Alyssa Milburn on Sun Oct 24 2004.
   6  *  Copyright (c) 2004 Alyssa Milburn. All rights reserved.
   7  *
   8  *  This library is free software; you can redistribute it and/or
   9  *  modify it under the terms of the GNU Lesser General Public
  10  *  License as published by the Free Software Foundation; either
  11  *  version 2 of the License, or (at your option) any later version.
  12  *
  13  *  This library is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  *  Lesser General Public License for more details.
  17  *
  18  */
  19
  20 #include "SDLBackend.h"
  21 #include "SDL_gfxPrimitives.h"
  22 #include "SDL_ttf.h"
  23 #include "openc2e.h"
  24 #include "Engine.h"
  25 #include "creaturesImage.h"
  26
  27 SDLBackend *g_backend;
  28
  29 SDLBackend::SDLBackend() : mainsurface(this) {
  30         networkingup = false;
  31         basicfont = 0;
  32
  33         // reasonable defaults
  34         mainsurface.width = 800;
  35         mainsurface.height = 600;
  36         mainsurface.surface = 0;
  37 }
  38
  39 int SDLBackend::idealBpp() {
  40         // shadow surfaces seem to generally be faster (presumably due to overdraw), so get SDL to create one for us
  41         if (engine.version == 1) return 0;
  42         else return 16;
  43 }
  44
  45 void SDLBackend::resizeNotify(int _w, int _h) {
  46         mainsurface.width = _w;
  47         mainsurface.height = _h;
  48         mainsurface.surface = SDL_SetVideoMode(_w, _h, idealBpp(), SDL_RESIZABLE);
  49         if (!mainsurface.surface)
  50                 throw creaturesException(std::string("Failed to create SDL surface due to: ") + SDL_GetError());
  51 }
  52
  53 void SDLBackend::init() {
  54         int init = SDL_INIT_VIDEO;
  55
  56         if (SDL_Init(init) < 0)
  57                 throw creaturesException(std::string("SDL error during initialization: ") + SDL_GetError());
  58
  59         std::string windowtitle;
  60         if (engine.getGameName().size()) windowtitle = engine.getGameName() + " - ";
  61         windowtitle += "openc2e";
  62         std::string titlebar = windowtitle + " (development build)";
  63         SDL_WM_SetCaption(titlebar.c_str(), windowtitle.c_str());
  64
  65         SDL_EnableKeyRepeat(SDL_DEFAULT_REPEAT_DELAY, SDL_DEFAULT_REPEAT_INTERVAL);
  66         SDL_ShowCursor(false);
  67         // bz2 and fuzzie both think this is the only way to get useful ascii out of SDL
  68         SDL_EnableUNICODE(1);
  69
  70         if (TTF_Init() == 0) {
  71                 // TODO: think about font sizing
  72                 basicfont = TTF_OpenFont("VeraSe.ttf", 9);
  73                 if (!basicfont) // TODO: think about font fallbacks/etc
  74                         basicfont = TTF_OpenFont("/usr/share/fonts/truetype/ttf-bitstream-vera/VeraSe.ttf", 9);
  75         }
  76 }
  77
  78 int SDLBackend::networkInit() {
  79         if (SDLNet_Init() < 0)
  80                 throw creaturesException(std::string("SDL_net error during initialization: ") + SDLNet_GetError());
  81         networkingup = true;
  82
  83         listensocket = 0;
  84         int listenport = 20000;
  85         while ((!listensocket) && (listenport < 20050)) {
  86                 listenport++;
  87                 IPaddress ip;
  88
  89                 SDLNet_ResolveHost(&ip, 0, listenport);
  90                 listensocket = SDLNet_TCP_Open(&ip);
  91         }
  92
  93         if (!listensocket)
  94                 throw creaturesException(std::string("Failed to open a port to listen on."));
  95
  96         return listenport;
  97 }
  98
  99 void SDLBackend::shutdown() {
 100         if (TTF_WasInit())
 101                 TTF_Quit();
 102         if (networkingup && listensocket)
 103                 SDLNet_TCP_Close(listensocket);
 104         SDLNet_Quit();
 105         SDL_Quit();
 106 }
 107
 108 void SDLBackend::handleEvents() {
 109         if (networkingup)
 110                 handleNetworking();
 111 }
 112
 113 void SDLBackend::handleNetworking() {
 114         // handle incoming network connections
 115         while (TCPsocket connection = SDLNet_TCP_Accept(listensocket)) {
 116                 // check this connection is coming from localhost
 117                 IPaddress *remote_ip = SDLNet_TCP_GetPeerAddress(connection);
 118                 unsigned char *rip = (unsigned char *)&remote_ip->host;
 119                 if ((rip[0] != 127) || (rip[1] != 0) || (rip[2] != 0) || (rip[3] != 1)) {
 120                         std::cout << "Someone tried connecting via non-localhost address! IP: " << (int)rip[0] << "." << (int)rip[1] << "." << (int)rip[2] << "." << (int)rip[3] << std::endl;
 121                         SDLNet_TCP_Close(connection);
 122                         continue;
 123                 }
 124
 125                 // read the data from the socket
 126                 std::string data;
 127                 bool done = false;
 128                 while (!done) {
 129                         char buffer;
 130                         int i = SDLNet_TCP_Recv(connection, &buffer, 1);
 131                         if (i == 1) {
 132                                 data = data + buffer;
 133                                 // TODO: maybe we should check for rscr\n like c2e seems to
 134                                 if ((data.size() > 3) && (data.find("rscr\n", data.size() - 5) != data.npos)) done = true;
 135                         } else done = true;
 136                 }
 137
 138                 // pass the data onto the engine, and send back our response
 139                 std::string tosend = engine.executeNetwork(data);
 140                 SDLNet_TCP_Send(connection, (void *)tosend.c_str(), tosend.size());
 141
 142                 // and finally, close the connection
 143                 SDLNet_TCP_Close(connection);
 144         }
 145 }
 146
 147 bool SDLBackend::pollEvent(SomeEvent &e) {
 148         SDL_Event event;
 149 retry:
 150         if (!SDL_PollEvent(&event)) return false;
 151
 152         switch (event.type) {
 153                 case SDL_VIDEORESIZE:
 154                         resizeNotify(event.resize.w, event.resize.h);
 155                         e.type = eventresizewindow;
 156                         e.x = event.resize.w;
 157                         e.y = event.resize.h;
 158                         break;
 159
 160                 case SDL_MOUSEMOTION:
 161                         e.type = eventmousemove;
 162                         e.x = event.motion.x;
 163                         e.y = event.motion.y;
 164                         e.xrel = event.motion.xrel;
 165                         e.yrel = event.motion.yrel;
 166       e.button = 0;
 167       if (event.motion.state & SDL_BUTTON(1))
 168         e.button |= buttonleft;
 169       if (event.motion.state & SDL_BUTTON(2))
 170         e.button |= buttonmiddle;
 171       if (event.motion.state & SDL_BUTTON(3))
 172         e.button |= buttonright;
 173       if (event.motion.state & SDL_BUTTON(4))
 174         e.button |= buttonwheelup;
 175       if (event.motion.state & SDL_BUTTON(5))
 176         e.button |= buttonwheeldown;
 177                         break;
 178
 179                 case SDL_MOUSEBUTTONDOWN:
 180                 case SDL_MOUSEBUTTONUP:
 181                         if (event.type == SDL_MOUSEBUTTONDOWN)
 182                                 e.type = eventmousebuttondown;
 183                         else
 184                                 e.type = eventmousebuttonup;
 185                         switch (event.button.button) {
 186                                 case SDL_BUTTON_LEFT: e.button = buttonleft; break;
 187                                 case SDL_BUTTON_RIGHT: e.button = buttonright; break;
 188                                 case SDL_BUTTON_MIDDLE: e.button = buttonmiddle; break;
 189                                 case SDL_BUTTON_WHEELDOWN: e.button = buttonwheeldown; break;
 190                                 case SDL_BUTTON_WHEELUP: e.button = buttonwheelup; break;
 191                                 default: goto retry;
 192                         }
 193                         e.x = event.button.x;
 194                         e.y = event.button.y;
 195                         break;
 196
 197         case SDL_KEYUP:
 198             {
 199                 int key = translateKey(event.key.keysym.sym);
 200                 if (key != -1) {
 201                     e.type = eventspecialkeyup;
 202                     e.key = key;
 203                     return true;
 204                 }
 205                 goto retry;
 206             }
 207
 208                 case SDL_KEYDOWN:
 209                         if ((event.key.keysym.unicode) && ((event.key.keysym.unicode & 0xFF80) == 0) && (event.key.keysym.unicode >= 32)) {
 210                                 e.type = eventkeydown;
 211                                 e.key = event.key.keysym.unicode & 0x7F;
 212                                 return true;
 213                         } else { // TODO: should this be 'else'?
 214                                 int key = translateKey(event.key.keysym.sym);
 215                                 if (key != -1) {
 216                                         e.type = eventspecialkeydown;
 217                                         e.key = key;
 218                                         return true;
 219                                 }
 220                         }
 221                         goto retry;
 222             break;
 223
 224                 case SDL_QUIT:
 225                         e.type = eventquit;
 226                         break;
 227
 228                 default:
 229                         goto retry;
 230         }
 231
 232         return true;
 233 }
 234
 235 void SDLSurface::renderLine(int x1, int y1, int x2, int y2, unsigned int colour) {
 236         aalineColor(surface, x1, y1, x2, y2, colour);
 237 }
 238
 239 SDL_Color getColourFromRGBA(unsigned int c) {
 240         // SDL's functions seem to want a pixelformat, which is more effort to fake than just doing this
 241         SDL_Color sdlc;
 242         sdlc.b = c & 0xff;
 243         sdlc.g = (c >> 8) & 0xff;
 244         sdlc.r = (c >> 16) & 0xff;
 245         assert(c >> 24 == 0);
 246         return sdlc;
 247 }
 248
 249 void SDLSurface::renderText(int x, int y, std::string text, unsigned int colour, unsigned int bgcolour) {
 250         if (!parent->basicfont) return;
 251         if (text.empty()) return;
 252
 253         SDL_Color sdlcolour;
 254         if (engine.version == 1) sdlcolour = palette[colour];
 255         else sdlcolour = getColourFromRGBA(colour);
 256
 257         SDL_Surface *textsurf;
 258
 259         if (bgcolour == 0) { // transparent
 260                 textsurf = TTF_RenderText_Solid(parent->basicfont, text.c_str(), sdlcolour);
 261         } else {
 262                 SDL_Color sdlbgcolour;
 263                 if (engine.version == 1) sdlbgcolour = palette[bgcolour];
 264                 else sdlbgcolour = getColourFromRGBA(bgcolour);
 265                 textsurf = TTF_RenderText_Shaded(parent->basicfont, text.c_str(), sdlcolour, sdlbgcolour);
 266         }
 267
 268         if (!textsurf) return; // thanks, SDL_ttf, we love you too
 269
 270         SDL_Rect destrect;
 271         destrect.x = x; destrect.y = y;
 272         SDL_BlitSurface(textsurf, NULL, surface, &destrect);
 273         SDL_FreeSurface(textsurf);
 274 }
 275
 276 //*** code to mirror 16bpp surface - slow, we should cache this!
 277
 278 Uint16 *pixelPtr(SDL_Surface *surf, int x, int y) {
 279         return (Uint16 *)((Uint8 *)surf->pixels + (y * surf->pitch) + (x * 2));
 280 }
 281
 282 SDL_Surface *MirrorSurface(SDL_Surface *surf) {
 283         SDL_Surface* newsurf = SDL_CreateRGBSurface(SDL_HWSURFACE, surf->w, surf->h, surf->format->BitsPerPixel, surf->format->Rmask, surf->format->Gmask, surf->format->Bmask, surf->format->Amask);
 284         assert(newsurf);
 285         SDL_BlitSurface(surf, 0, newsurf, 0);
 286
 287         if (SDL_MUSTLOCK(newsurf))
 288                 if (SDL_LockSurface(newsurf) == -1) {
 289                         SDL_FreeSurface(newsurf);
 290                         throw creaturesException("SDLBackend failed to lock surface for mirroring");
 291                 }
 292
 293         for (int y = 0; y < newsurf->h; y++) {
 294                 for (int x = 0; x < (newsurf->w / 2); x++) {
 295                         Uint16 *one = pixelPtr(newsurf, x, y);
 296                         Uint16 *two = pixelPtr(newsurf, (newsurf->w - 1) - x, y);
 297                         Uint16 temp = *one;
 298                         *one = *two;
 299                         *two = temp;
 300                 }
 301         }
 302
 303         if (SDL_MUSTLOCK(newsurf))
 304                 SDL_UnlockSurface(newsurf);
 305
 306         return newsurf;
 307 }
 308
 309 //*** end mirror code
 310
 311 void SDLSurface::render(shared_ptr<creaturesImage> image, unsigned int frame, int x, int y, bool trans, unsigned char transparency, bool mirror, bool is_background) {
 312         assert(image);
 313
 314         // don't bother rendering off-screen stuff
 315         if (x >= (int)width) return; if (y >= (int)height) return;
 316         if ((x + image->width(frame)) <= 0) return;
 317         if ((y + image->height(frame)) <= 0) return;
 318
 319         // create surface
 320         SDL_Surface *surf;
 321         if (image->format() == if_paletted) {
 322                 surf = SDL_CreateRGBSurfaceFrom(image->data(frame),
 323                                                 image->width(frame), image->height(frame),
 324                                                 8, // depth
 325                                                 image->width(frame), // pitch
 326                                                 0, 0, 0, 0);
 327                 assert(surf);
 328                 SDL_SetPalette(surf, SDL_LOGPAL, palette, 0, 256);
 329         } else if (image->format() == if_16bit) {
 330                 unsigned int rmask, gmask, bmask;
 331                 if (image->is565()) {
 332                         rmask = 0xF800; gmask = 0x07E0; bmask = 0x001F;
 333                 } else {
 334                         rmask = 0x7C00; gmask = 0x03E0; bmask = 0x001F;
 335                 }
 336                 surf = SDL_CreateRGBSurfaceFrom(image->data(frame),
 337                                                 image->width(frame), image->height(frame),
 338                                                 16, // depth
 339                                                 image->width(frame) * 2, // pitch
 340                                                 rmask, gmask, bmask, 0); // RGBA mask
 341                 assert(surf);
 342         } else {
 343                 assert(image->format() == if_24bit);
 344
 345                 surf = SDL_CreateRGBSurfaceFrom(image->data(frame),
 346                                                 image->width(frame), image->height(frame),
 347                                                 24, // depth
 348                                                 image->width(frame) * 3, // pitch
 349                                                 0x00FF0000, 0x0000FF00, 0x000000FF, 0); // RGBA mask
 350                 assert(surf);
 351
 352         }
 353
 354         // try mirroring, if necessary
 355         try {
 356                 if (mirror) {
 357                         SDL_Surface *newsurf = MirrorSurface(surf);
 358                         SDL_FreeSurface(surf);
 359                         surf = newsurf;
 360                 }
 361         } catch (std::exception &e) {
 362                 SDL_FreeSurface(surf);
 363                 throw;
 364         }
 365
 366         // set colour-keying/alpha
 367         if (!is_background) SDL_SetColorKey(surf, SDL_SRCCOLORKEY, 0);
 368         if (trans) SDL_SetAlpha(surf, SDL_SRCALPHA, 255 - transparency);
 369
 370         // do actual blit
 371         SDL_Rect destrect;
 372         destrect.x = x; destrect.y = y;
 373         SDL_BlitSurface(surf, 0, surface, &destrect);
 374
 375         // free surface
 376         SDL_FreeSurface(surf);
 377 }
 378
 379 void SDLSurface::renderDone() {
 380         SDL_Flip(surface);
 381 }
 382
 383 void SDLSurface::blitSurface(Surface *s, int x, int y, int w, int h) {
 384         SDLSurface *src = dynamic_cast<SDLSurface *>(s);
 385         assert(src);
 386
 387         // TODO: evil use of internal SDL api
 388         SDL_Rect r; r.x = x; r.y = y; r.w = w; r.h = h;
 389         SDL_SoftStretch(src->surface, 0, surface, &r);
 390 }
 391
 392 Surface *SDLBackend::newSurface(unsigned int w, unsigned int h) {
 393         SDL_Surface *surf = mainsurface.surface;
 394         SDL_Surface* underlyingsurf = SDL_CreateRGBSurface(SDL_HWSURFACE, w, h, surf->format->BitsPerPixel, surf->format->Rmask, surf->format->Gmask, surf->format->Bmask, surf->format->Amask);
 395         assert(underlyingsurf);
 396         SDLSurface *newsurf = new SDLSurface(this);
 397         newsurf->surface = underlyingsurf;
 398         newsurf->width = w;
 399         newsurf->height = h;
 400         return newsurf;
 401 }
 402
 403 void SDLBackend::freeSurface(Surface *s) {
 404         SDLSurface *surf = dynamic_cast<SDLSurface *>(s);
 405         assert(surf);
 406
 407         SDL_FreeSurface(surf->surface);
 408         delete surf;
 409 }
 410
 411 // left out: menu, select, execute, snapshot, numeric keypad, f keys
 412 #define keytrans_size 25
 413 struct _keytrans { int sdl, windows; } keytrans[keytrans_size] = {
 414         { SDLK_BACKSPACE, 8 },
 415         { SDLK_TAB, 9 },
 416         { SDLK_CLEAR, 12 },
 417         { SDLK_RETURN, 13 },
 418         { SDLK_RSHIFT, 16 },
 419         { SDLK_LSHIFT, 16 },
 420         { SDLK_RCTRL, 17 },
 421         { SDLK_LCTRL, 17 },
 422         { SDLK_PAUSE, 19 },
 423         { SDLK_CAPSLOCK, 20 },
 424         { SDLK_ESCAPE, 27 },
 425         { SDLK_SPACE, 32 },
 426         { SDLK_PAGEUP, 33 },
 427         { SDLK_PAGEDOWN, 34 },
 428         { SDLK_END, 35 },
 429         { SDLK_HOME, 36 },
 430         { SDLK_LEFT, 37 },
 431         { SDLK_UP, 38 },
 432         { SDLK_RIGHT, 39 },
 433         { SDLK_DOWN, 40 },
 434         { SDLK_PRINT, 42 },
 435         { SDLK_INSERT, 45 },
 436         { SDLK_DELETE, 46 },
 437         { SDLK_NUMLOCK, 144 }
 438 };
 439
 440 // TODO: handle f keys (112-123 under windows, SDLK_F1 = 282 under sdl)
 441
 442 // TODO: this is possibly not a great idea, we should maybe maintain our own state table
 443 bool SDLBackend::keyDown(int key) {
 444         Uint8 *keystate = SDL_GetKeyState(NULL);
 445
 446         for (unsigned int i = 0; i < keytrans_size; i++) {
 447                 if (keytrans[i].windows == key)
 448                         if (keystate[keytrans[i].sdl])
 449                                 return true;
 450         }
 451
 452         return false;
 453 }
 454
 455 int SDLBackend::translateKey(int key) {
 456         if (key >= 97 && key <= 122) { // lowercase letters
 457                 return key - 32; // capitalise
 458         }
 459         if (key >= 48 && key <= 57) { // numbers
 460                 return key;
 461         }
 462
 463         for (unsigned int i = 0; i < keytrans_size; i++) {
 464                 if (keytrans[i].sdl == key)
 465                         return keytrans[i].windows;
 466         }
 467
 468         return -1;
 469 }
 470
 471 void SDLBackend::setPalette(uint8 *data) {
 472         // TODO: we only set the palette on our main surface, so will fail for any C1 cameras!
 473         for (unsigned int i = 0; i < 256; i++) {
 474                 mainsurface.palette[i].r = data[i * 3];
 475                 mainsurface.palette[i].g = data[(i * 3) + 1];
 476                 mainsurface.palette[i].b = data[(i * 3) + 2];
 477         }
 478 }
 479
 480 void SDLBackend::delay(int msec) {
 481         SDL_Delay(msec);
 482 }