src/video/gl/gl_renderer.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 "video/gl/gl_renderer.hpp"
  18
  19 #include <iomanip>
  20 #include <iostream>
  21 #include <physfs.h>
  22
  23 #include "supertux/gameconfig.hpp"
  24 #include "supertux/globals.hpp"
  25 #include "video/drawing_request.hpp"
  26 #include "video/gl/gl_surface_data.hpp"
  27 #include "video/gl/gl_texture.hpp"
  28 #define LIGHTMAP_DIV 5
  29
  30 #ifdef GL_VERSION_ES_CM_1_0
  31 #  define glOrtho glOrthof
  32 #endif
  33
  34 GLRenderer::GLRenderer() :
  35   desktop_size(-1, -1),
  36   screen_size(-1, -1),
  37   fullscreen_active(false)
  38 {
  39   Renderer::instance_ = this;
  40
  41 #if SDL_MAJOR_VERSION > 1 || SDL_MINOR_VERSION > 2 || (SDL_MINOR_VERSION == 2 && SDL_PATCHLEVEL >= 10)
  42   // unfortunately only newer SDLs have these infos.
  43   // This must be called before SDL_SetVideoMode() or it will return
  44   // the window size instead of the desktop size.
  45   const SDL_VideoInfo *info = SDL_GetVideoInfo();
  46   if (info)
  47   {
  48     desktop_size = Size(info->current_w, info->current_h);
  49   }
  50 #endif
  51
  52   if(texture_manager != 0)
  53     texture_manager->save_textures();
  54
  55 #ifdef SDL_GL_SWAP_CONTROL
  56   if(config->try_vsync) {
  57     /* we want vsync for smooth scrolling */
  58     SDL_GL_SetAttribute(SDL_GL_SWAP_CONTROL, 1);
  59   }
  60 #endif
  61
  62   SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
  63
  64   // FIXME: Hu? 16bit rendering?
  65   SDL_GL_SetAttribute(SDL_GL_RED_SIZE,   5);
  66   SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 5);
  67   SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE,  5);
  68
  69   if(g_config->use_fullscreen)
  70   {
  71     apply_video_mode(g_config->fullscreen_size, true);
  72   }
  73   else
  74   {
  75     apply_video_mode(g_config->window_size, false);
  76   }
  77
  78   // setup opengl state and transform
  79   glDisable(GL_DEPTH_TEST);
  80   glDisable(GL_CULL_FACE);
  81   glEnable(GL_TEXTURE_2D);
  82   glEnable(GL_BLEND);
  83   glEnableClientState(GL_VERTEX_ARRAY);
  84   glEnableClientState(GL_TEXTURE_COORD_ARRAY);
  85   glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
  86
  87   // Init the projection matrix, viewport and stuff
  88   apply_config();
  89
  90   if(texture_manager == 0)
  91     texture_manager = new TextureManager();
  92   else
  93     texture_manager->reload_textures();
  94
  95 #ifndef GL_VERSION_ES_CM_1_0
  96   GLenum err = glewInit();
  97   if (GLEW_OK != err)
  98   {
  99     std::ostringstream out;
 100     out << "GLRenderer: " << glewGetErrorString(err);
 101     throw std::runtime_error(out.str());
 102   }
 103   log_info << "Using GLEW " << glewGetString(GLEW_VERSION) << std::endl;
 104   log_info << "GLEW_ARB_texture_non_power_of_two: " << static_cast<int>(GLEW_ARB_texture_non_power_of_two) << std::endl;
 105 #endif
 106 }
 107
 108 GLRenderer::~GLRenderer()
 109 {
 110 }
 111
 112 void
 113 GLRenderer::draw_surface(const DrawingRequest& request)
 114 {
 115   const Surface* surface = (const Surface*) request.request_data;
 116   GLTexture* gltexture = static_cast<GLTexture*>(surface->get_texture().get());
 117   GLSurfaceData *surface_data = static_cast<GLSurfaceData*>(surface->get_surface_data());
 118
 119   glBindTexture(GL_TEXTURE_2D, gltexture->get_handle());
 120   intern_draw(request.pos.x, request.pos.y,
 121               request.pos.x + surface->get_width(),
 122               request.pos.y + surface->get_height(),
 123               surface_data->get_uv_left(),
 124               surface_data->get_uv_top(),
 125               surface_data->get_uv_right(),
 126               surface_data->get_uv_bottom(),
 127               request.angle,
 128               request.alpha,
 129               request.color,
 130               request.blend,
 131               request.drawing_effect);
 132 }
 133
 134 void
 135 GLRenderer::draw_surface_part(const DrawingRequest& request)
 136 {
 137   const SurfacePartRequest* surfacepartrequest
 138     = (SurfacePartRequest*) request.request_data;
 139   const Surface* surface = surfacepartrequest->surface;
 140   boost::shared_ptr<GLTexture> gltexture = boost::dynamic_pointer_cast<GLTexture>(surface->get_texture());
 141   GLSurfaceData *surface_data = reinterpret_cast<GLSurfaceData *>(surface->get_surface_data());
 142
 143   float uv_width = surface_data->get_uv_right() - surface_data->get_uv_left();
 144   float uv_height = surface_data->get_uv_bottom() - surface_data->get_uv_top();
 145
 146   float uv_left = surface_data->get_uv_left() + (uv_width * surfacepartrequest->source.x) / surface->get_width();
 147   float uv_top = surface_data->get_uv_top() + (uv_height * surfacepartrequest->source.y) / surface->get_height();
 148   float uv_right = surface_data->get_uv_left() + (uv_width * (surfacepartrequest->source.x + surfacepartrequest->size.x)) / surface->get_width();
 149   float uv_bottom = surface_data->get_uv_top() + (uv_height * (surfacepartrequest->source.y + surfacepartrequest->size.y)) / surface->get_height();
 150
 151   glBindTexture(GL_TEXTURE_2D, gltexture->get_handle());
 152   intern_draw(request.pos.x, request.pos.y,
 153               request.pos.x + surfacepartrequest->size.x,
 154               request.pos.y + surfacepartrequest->size.y,
 155               uv_left,
 156               uv_top,
 157               uv_right,
 158               uv_bottom,
 159               0.0,
 160               request.alpha,
 161               request.color,
 162               Blend(),
 163               request.drawing_effect);
 164 }
 165
 166 void
 167 GLRenderer::draw_gradient(const DrawingRequest& request)
 168 {
 169   const GradientRequest* gradientrequest
 170     = (GradientRequest*) request.request_data;
 171   const Color& top = gradientrequest->top;
 172   const Color& bottom = gradientrequest->bottom;
 173
 174   glDisable(GL_TEXTURE_2D);
 175   glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 176   glEnableClientState(GL_COLOR_ARRAY);
 177
 178   float vertices[] = {
 179     0, 0,
 180     SCREEN_WIDTH, 0,
 181     SCREEN_WIDTH, SCREEN_HEIGHT,
 182     0, SCREEN_HEIGHT
 183   };
 184   glVertexPointer(2, GL_FLOAT, 0, vertices);
 185
 186   float colors[] = {
 187     top.red, top.green, top.blue, top.alpha,
 188     top.red, top.green, top.blue, top.alpha,
 189     bottom.red, bottom.green, bottom.blue, bottom.alpha,
 190     bottom.red, bottom.green, bottom.blue, bottom.alpha,
 191   };
 192   glColorPointer(4, GL_FLOAT, 0, colors);
 193
 194   glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
 195
 196   glDisableClientState(GL_COLOR_ARRAY);
 197   glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 198
 199   glEnable(GL_TEXTURE_2D);
 200   glColor4f(1, 1, 1, 1);
 201 }
 202
 203 void
 204 GLRenderer::draw_filled_rect(const DrawingRequest& request)
 205 {
 206   const FillRectRequest* fillrectrequest
 207     = (FillRectRequest*) request.request_data;
 208
 209   glDisable(GL_TEXTURE_2D);
 210   glColor4f(fillrectrequest->color.red, fillrectrequest->color.green,
 211             fillrectrequest->color.blue, fillrectrequest->color.alpha);
 212   glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 213
 214   if (fillrectrequest->radius != 0.0f)
 215   {
 216     // draw round rect
 217     // Keep radius in the limits, so that we get a circle instead of
 218     // just graphic junk
 219     float radius = std::min(fillrectrequest->radius,
 220                             std::min(fillrectrequest->size.x/2,
 221                                      fillrectrequest->size.y/2));
 222
 223     // inner rectangle
 224     Rectf irect(request.pos.x    + radius,
 225                request.pos.y    + radius,
 226                request.pos.x + fillrectrequest->size.x - radius,
 227                request.pos.y + fillrectrequest->size.y - radius);
 228
 229     int n = 8;
 230     int p = 0;
 231     std::vector<float> vertices((n+1) * 4 * 2);
 232
 233     for(int i = 0; i <= n; ++i)
 234     {
 235       float x = sinf(i * (M_PI/2) / n) * radius;
 236       float y = cosf(i * (M_PI/2) / n) * radius;
 237
 238       vertices[p++] = irect.get_left() - x;
 239       vertices[p++] = irect.get_top()  - y;
 240
 241       vertices[p++] = irect.get_right() + x;
 242       vertices[p++] = irect.get_top()   - y;
 243     }
 244
 245     for(int i = 0; i <= n; ++i)
 246     {
 247       float x = cosf(i * (M_PI/2) / n) * radius;
 248       float y = sinf(i * (M_PI/2) / n) * radius;
 249
 250       vertices[p++] = irect.get_left()   - x;
 251       vertices[p++] = irect.get_bottom() + y;
 252
 253       vertices[p++] = irect.get_right()  + x;
 254       vertices[p++] = irect.get_bottom() + y;
 255     }
 256
 257     glVertexPointer(2, GL_FLOAT, 0, &*vertices.begin());
 258     glDrawArrays(GL_TRIANGLE_STRIP, 0,  vertices.size()/2);
 259   }
 260   else
 261   {
 262     float x = request.pos.x;
 263     float y = request.pos.y;
 264     float w = fillrectrequest->size.x;
 265     float h = fillrectrequest->size.y;
 266
 267     float vertices[] = {
 268       x,   y,
 269       x+w, y,
 270       x+w, y+h,
 271       x,   y+h
 272     };
 273     glVertexPointer(2, GL_FLOAT, 0, vertices);
 274
 275     glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
 276   }
 277
 278   glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 279   glEnable(GL_TEXTURE_2D);
 280   glColor4f(1, 1, 1, 1);
 281 }
 282
 283 void
 284 GLRenderer::draw_inverse_ellipse(const DrawingRequest& request)
 285 {
 286   const InverseEllipseRequest* ellipse = (InverseEllipseRequest*)request.request_data;
 287
 288   glDisable(GL_TEXTURE_2D);
 289   glColor4f(ellipse->color.red,  ellipse->color.green,
 290             ellipse->color.blue, ellipse->color.alpha);
 291
 292   float x = request.pos.x;
 293   float y = request.pos.y;
 294   float w = ellipse->size.x/2.0f;
 295   float h = ellipse->size.y/2.0f;
 296
 297   static const int slices = 16;
 298   static const int points = (slices+1) * 12;
 299
 300   float vertices[points * 2];
 301   int   p = 0;
 302
 303   // Bottom
 304   vertices[p++] = SCREEN_WIDTH; vertices[p++] = SCREEN_HEIGHT;
 305   vertices[p++] = 0;            vertices[p++] = SCREEN_HEIGHT;
 306   vertices[p++] = x;            vertices[p++] = y+h;
 307
 308   // Top
 309   vertices[p++] = SCREEN_WIDTH; vertices[p++] = 0;
 310   vertices[p++] = 0;            vertices[p++] = 0;
 311   vertices[p++] = x;            vertices[p++] = y-h;
 312
 313   // Left
 314   vertices[p++] = SCREEN_WIDTH; vertices[p++] = 0;
 315   vertices[p++] = SCREEN_WIDTH; vertices[p++] = SCREEN_HEIGHT;
 316   vertices[p++] = x+w;          vertices[p++] = y;
 317
 318   // Right
 319   vertices[p++] = 0;            vertices[p++] = 0;
 320   vertices[p++] = 0;            vertices[p++] = SCREEN_HEIGHT;
 321   vertices[p++] = x-w;          vertices[p++] = y;
 322
 323   for(int i = 0; i < slices; ++i)
 324   {
 325     float ex1 = sinf(M_PI/2 / slices * i) * w;
 326     float ey1 = cosf(M_PI/2 / slices * i) * h;
 327
 328     float ex2 = sinf(M_PI/2 / slices * (i+1)) * w;
 329     float ey2 = cosf(M_PI/2 / slices * (i+1)) * h;
 330
 331     // Bottom/Right
 332     vertices[p++] = SCREEN_WIDTH; vertices[p++] = SCREEN_HEIGHT;
 333     vertices[p++] = x + ex1;      vertices[p++] = y + ey1;
 334     vertices[p++] = x + ex2;      vertices[p++] = y + ey2;
 335
 336     // Top/Left
 337     vertices[p++] = 0;            vertices[p++] = 0;
 338     vertices[p++] = x - ex1;      vertices[p++] = y - ey1;
 339     vertices[p++] = x - ex2;      vertices[p++] = y - ey2;
 340
 341     // Top/Right
 342     vertices[p++] = SCREEN_WIDTH; vertices[p++] = 0;
 343     vertices[p++] = x + ex1;      vertices[p++] = y - ey1;
 344     vertices[p++] = x + ex2;      vertices[p++] = y - ey2;
 345
 346     // Bottom/Left
 347     vertices[p++] = 0;            vertices[p++] = SCREEN_HEIGHT;
 348     vertices[p++] = x - ex1;      vertices[p++] = y + ey1;
 349     vertices[p++] = x - ex2;      vertices[p++] = y + ey2;
 350   }
 351
 352   glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 353   glVertexPointer(2, GL_FLOAT, 0, vertices);
 354
 355   glDrawArrays(GL_TRIANGLES, 0, points);
 356
 357   glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 358
 359   glEnable(GL_TEXTURE_2D);
 360   glColor4f(1, 1, 1, 1);
 361 }
 362
 363 void
 364 GLRenderer::do_take_screenshot()
 365 {
 366   // [Christoph] TODO: Yes, this method also takes care of the actual disk I/O. Split it?
 367
 368   SDL_Surface *shot_surf;
 369   // create surface to hold screenshot
 370 #if SDL_BYTEORDER == SDL_BIG_ENDIAN
 371   shot_surf = SDL_CreateRGBSurface(SDL_SWSURFACE, SCREEN_WIDTH, SCREEN_HEIGHT, 24, 0x00FF0000, 0x0000FF00, 0x000000FF, 0);
 372 #else
 373   shot_surf = SDL_CreateRGBSurface(SDL_SWSURFACE, SCREEN_WIDTH, SCREEN_HEIGHT, 24, 0x000000FF, 0x0000FF00, 0x00FF0000, 0);
 374 #endif
 375   if (!shot_surf) {
 376     log_warning << "Could not create RGB Surface to contain screenshot" << std::endl;
 377     return;
 378   }
 379
 380   // read pixels into array
 381   char* pixels = new char[3 * SCREEN_WIDTH * SCREEN_HEIGHT];
 382   if (!pixels) {
 383     log_warning << "Could not allocate memory to store screenshot" << std::endl;
 384     SDL_FreeSurface(shot_surf);
 385     return;
 386   }
 387   glPixelStorei(GL_PACK_ALIGNMENT, 1);
 388   glReadPixels(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT, GL_RGB, GL_UNSIGNED_BYTE, pixels);
 389
 390   // copy array line-by-line
 391   for (int i = 0; i < SCREEN_HEIGHT; i++) {
 392     char* src = pixels + (3 * SCREEN_WIDTH * (SCREEN_HEIGHT - i - 1));
 393     if(SDL_MUSTLOCK(shot_surf))
 394     {
 395       SDL_LockSurface(shot_surf);
 396     }
 397     char* dst = ((char*)shot_surf->pixels) + i * shot_surf->pitch;
 398     memcpy(dst, src, 3 * SCREEN_WIDTH);
 399     if(SDL_MUSTLOCK(shot_surf))
 400     {
 401       SDL_UnlockSurface(shot_surf);
 402     }
 403   }
 404
 405   // free array
 406   delete[](pixels);
 407
 408   // save screenshot
 409   static const std::string writeDir = PHYSFS_getWriteDir();
 410   static const std::string dirSep = PHYSFS_getDirSeparator();
 411   static const std::string baseName = "screenshot";
 412   static const std::string fileExt = ".bmp";
 413   std::string fullFilename;
 414   for (int num = 0; num < 1000; num++) {
 415     std::ostringstream oss;
 416     oss << baseName;
 417     oss << std::setw(3) << std::setfill('0') << num;
 418     oss << fileExt;
 419     std::string fileName = oss.str();
 420     fullFilename = writeDir + dirSep + fileName;
 421     if (!PHYSFS_exists(fileName.c_str())) {
 422       SDL_SaveBMP(shot_surf, fullFilename.c_str());
 423       log_debug << "Wrote screenshot to \"" << fullFilename << "\"" << std::endl;
 424       SDL_FreeSurface(shot_surf);
 425       return;
 426     }
 427   }
 428   log_warning << "Did not save screenshot, because all files up to \"" << fullFilename << "\" already existed" << std::endl;
 429   SDL_FreeSurface(shot_surf);
 430 }
 431
 432 void
 433 GLRenderer::flip()
 434 {
 435   assert_gl("drawing");
 436   SDL_GL_SwapBuffers();
 437 }
 438
 439 void
 440 GLRenderer::resize(int w, int h)
 441 {
 442   // This causes the screen to go black, which is annoying, but seems
 443   // unavoidable with SDL at the moment
 444   SDL_SetVideoMode(w, h, 0, SDL_OPENGL | SDL_RESIZABLE);
 445
 446   g_config->window_size = Size(w, h);
 447
 448   apply_config();
 449 }
 450
 451 void
 452 GLRenderer::apply_config()
 453 {
 454   if (false)
 455   {
 456     log_info << "Applying Config:"
 457              << "\n  Desktop: " << desktop_size.width << "x" << desktop_size.height
 458              << "\n  Window:  " << g_config->window_size
 459              << "\n  FullRes: " << g_config->fullscreen_size
 460              << "\n  Aspect:  " << g_config->aspect_size
 461              << "\n  Magnif:  " << g_config->magnification
 462              << std::endl;
 463   }
 464
 465   float target_aspect = static_cast<float>(desktop_size.width) / static_cast<float>(desktop_size.height);
 466   if (g_config->aspect_size != Size(0, 0))
 467   {
 468     target_aspect = float(g_config->aspect_size.width) / float(g_config->aspect_size.height);
 469   }
 470
 471   float desktop_aspect = 4.0f / 3.0f; // random default fallback guess
 472   if (desktop_size.width != -1 && desktop_size.height != -1)
 473   {
 474     desktop_aspect = float(desktop_size.width) / float(desktop_size.height);
 475   }
 476
 477   Size screen_size;
 478
 479   // Get the screen width
 480   if (g_config->use_fullscreen)
 481   {
 482     screen_size = g_config->fullscreen_size;
 483     desktop_aspect = float(screen_size.width) / float(screen_size.height);
 484   }
 485   else
 486   {
 487     screen_size = g_config->window_size;
 488   }
 489
 490   apply_video_mode(screen_size, g_config->use_fullscreen);
 491
 492   if (target_aspect > 1.0f)
 493   {
 494     SCREEN_WIDTH  = static_cast<int>(screen_size.width * (target_aspect / desktop_aspect));
 495     SCREEN_HEIGHT = static_cast<int>(screen_size.height);
 496   }
 497   else
 498   {
 499     SCREEN_WIDTH  = static_cast<int>(screen_size.width);
 500     SCREEN_HEIGHT = static_cast<int>(screen_size.height  * (target_aspect / desktop_aspect));
 501   }
 502
 503   Size max_size(1280, 800);
 504
 505   if (g_config->magnification == 0.0f) // Magic value that means 'minfill'
 506   {
 507     // This scales SCREEN_WIDTH/SCREEN_HEIGHT so that they never excede
 508     // max_size.width/max_size.height
 509     if (SCREEN_WIDTH > max_size.width || SCREEN_HEIGHT > max_size.height)
 510     {
 511       float scale1  = float(max_size.width)/SCREEN_WIDTH;
 512       float scale2  = float(max_size.height)/SCREEN_HEIGHT;
 513       float scale   = (scale1 < scale2) ? scale1 : scale2;
 514       SCREEN_WIDTH  = static_cast<int>(SCREEN_WIDTH  * scale);
 515       SCREEN_HEIGHT = static_cast<int>(SCREEN_HEIGHT * scale);
 516     }
 517
 518     glViewport(0, 0, screen_size.width, screen_size.height);
 519   }
 520   else
 521   {
 522     SCREEN_WIDTH  = static_cast<int>(SCREEN_WIDTH  / g_config->magnification);
 523     SCREEN_HEIGHT = static_cast<int>(SCREEN_HEIGHT / g_config->magnification);
 524
 525     // This works by adding black borders around the screen to limit
 526     // SCREEN_WIDTH/SCREEN_HEIGHT to max_size.width/max_size.height
 527     Size new_size = screen_size;
 528
 529     if (SCREEN_WIDTH > max_size.width)
 530     {
 531       new_size.width = static_cast<int>((float) new_size.width * float(max_size.width)/SCREEN_WIDTH);
 532       SCREEN_WIDTH = static_cast<int>(max_size.width);
 533     }
 534
 535     if (SCREEN_HEIGHT > max_size.height)
 536     {
 537       new_size.height = static_cast<int>((float) new_size.height * float(max_size.height)/SCREEN_HEIGHT);
 538       SCREEN_HEIGHT = static_cast<int>(max_size.height);
 539     }
 540
 541     // Clear both buffers so that we get a clean black border without junk
 542     glClear(GL_COLOR_BUFFER_BIT);
 543     SDL_GL_SwapBuffers();
 544     glClear(GL_COLOR_BUFFER_BIT);
 545     SDL_GL_SwapBuffers();
 546
 547     glViewport(std::max(0, (screen_size.width  - new_size.width)  / 2),
 548                std::max(0, (screen_size.height - new_size.height) / 2),
 549                std::min(new_size.width,  screen_size.width),
 550                std::min(new_size.height, screen_size.height));
 551   }
 552
 553   glMatrixMode(GL_PROJECTION);
 554   glLoadIdentity();
 555
 556   glOrtho(0, SCREEN_WIDTH, SCREEN_HEIGHT, 0, -1, 1);
 557
 558   glMatrixMode(GL_MODELVIEW);
 559   glLoadIdentity();
 560   glTranslatef(0, 0, 0);
 561   check_gl_error("Setting up view matrices");
 562 }
 563
 564 void
 565 GLRenderer::apply_video_mode(const Size& size, bool fullscreen)
 566 {
 567   // Only change video mode when its different from the current one
 568   if (screen_size != size || fullscreen_active != fullscreen)
 569   {
 570     int flags = SDL_OPENGL;
 571
 572     if (fullscreen)
 573     {
 574       flags |= SDL_FULLSCREEN;
 575     }
 576     else
 577     {
 578       flags |= SDL_RESIZABLE;
 579     }
 580
 581     if (SDL_Surface *screen = SDL_SetVideoMode(size.width, size.height, 0, flags))
 582     {
 583       screen_size = Size(screen->w, screen->h);
 584       fullscreen_active = fullscreen;
 585     }
 586     else
 587     {
 588       std::ostringstream msg;
 589       msg << "Couldn't set video mode " << size.width << "x" << size.height << ": " << SDL_GetError();
 590       throw std::runtime_error(msg.str());
 591     }
 592   }
 593 }
 594
 595 /* EOF */