src/video/gl/gl_renderer.cpp

   1 //  SuperTux
   2 //  Copyright (C) 2006 Matthias Braun <matze@braunis.de>
   3 //      Updated by GiBy 2013 for SDL2 <giby_the_kid@yahoo.fr>
   4 //
   5 //  This program is free software: you can redistribute it and/or modify
   6 //  it under the terms of the GNU General Public License as published by
   7 //  the Free Software Foundation, either version 3 of the License, or
   8 //  (at your option) any later version.
   9 //
  10 //  This program is distributed in the hope that it will be useful,
  11 //  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 //  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 //  GNU General Public License for more details.
  14 //
  15 //  You should have received a copy of the GNU General Public License
  16 //  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17
  18 #include "video/gl/gl_renderer.hpp"
  19
  20 #include <iomanip>
  21 #include <iostream>
  22 #include <physfs.h>
  23 #include "SDL2/SDL.h"
  24 //#include "SDL/SDL.h"
  25 //#include "SDL/SDL_opengl.h"
  26
  27 #include "supertux/gameconfig.hpp"
  28 #include "supertux/globals.hpp"
  29 #include "video/drawing_request.hpp"
  30 #include "video/gl/gl_surface_data.hpp"
  31 #include "video/gl/gl_texture.hpp"
  32 #define LIGHTMAP_DIV 5
  33
  34 #ifdef GL_VERSION_ES_CM_1_0
  35 #  define glOrtho glOrthof
  36 #endif
  37
  38 GLRenderer::GLRenderer() :
  39   desktop_size(-1, -1),
  40   screen_size(-1, -1),
  41   fullscreen_active(false),
  42   last_texture(static_cast<GLuint> (-1))
  43 {
  44   Renderer::instance_ = this;
  45
  46 #if SDL_MAJOR_VERSION > 1 || SDL_MINOR_VERSION > 2 || (SDL_MINOR_VERSION == 2 && SDL_PATCHLEVEL >= 10)
  47   // unfortunately only newer SDLs have these infos.
  48   // This must be called before SDL_SetVideoMode() or it will return
  49   // the window size instead of the desktop size.
  50   const SDL_VideoInfo *info = SDL_GetVideoInfo();
  51   if (info)
  52   {
  53     desktop_size = Size(info->current_w, info->current_h);
  54   }
  55 #endif
  56
  57   if(texture_manager != 0)
  58     texture_manager->save_textures();
  59
  60 #ifdef SDL_GL_SWAP_CONTROL
  61   if(config->try_vsync) {
  62     /* we want vsync for smooth scrolling */
  63      SDL_GL_SetSwapInterval(1);
  64   }
  65 #endif
  66
  67    SDL_GL_SetSwapInterval(SDL_GL_DOUBLEBUFFER, 1);
  68
  69   // FIXME: Hu? 16bit rendering?
  70    SDL_GL_SetSwapInterval(5);
  71    SDL_GL_SetSwapInterval(5);
  72    SDL_GL_SetSwapInterval(5);
  73
  74   if(g_config->use_fullscreen)
  75   {
  76     apply_video_mode(g_config->fullscreen_size, true);
  77   }
  78   else
  79   {
  80     apply_video_mode(g_config->window_size, false);
  81   }
  82
  83   // setup opengl state and transform
  84   glDisable(GL_DEPTH_TEST);
  85   glDisable(GL_CULL_FACE);
  86   glEnable(GL_TEXTURE_2D);
  87   glEnable(GL_BLEND);
  88   glEnableClientState(GL_VERTEX_ARRAY);
  89   glEnableClientState(GL_TEXTURE_COORD_ARRAY);
  90   glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
  91
  92   // Init the projection matrix, viewport and stuff
  93   apply_config();
  94
  95   if(texture_manager == 0)
  96     texture_manager = new TextureManager();
  97   else
  98     texture_manager->reload_textures();
  99
 100 #ifndef GL_VERSION_ES_CM_1_0
 101   GLenum err = glewInit();
 102   if (GLEW_OK != err)
 103   {
 104     std::ostringstream out;
 105     out << "GLRenderer: " << glewGetErrorString(err);
 106     throw std::runtime_error(out.str());
 107   }
 108   log_info << "Using GLEW " << glewGetString(GLEW_VERSION) << std::endl;
 109   log_info << "GLEW_ARB_texture_non_power_of_two: " << static_cast<int>(GLEW_ARB_texture_non_power_of_two) << std::endl;
 110 #endif
 111 }
 112
 113 GLRenderer::~GLRenderer()
 114 {
 115 }
 116
 117 void
 118 GLRenderer::draw_surface(const DrawingRequest& request)
 119 {
 120   const Surface* surface = (const Surface*) request.request_data;
 121   GLTexture* gltexture = static_cast<GLTexture*>(surface->get_texture().get());
 122   GLSurfaceData *surface_data = static_cast<GLSurfaceData*>(surface->get_surface_data());
 123
 124   GLuint th = gltexture->get_handle();
 125   if (th != last_texture) {
 126     last_texture = th;
 127     glBindTexture(GL_TEXTURE_2D, th);
 128   }
 129   intern_draw(request.pos.x, request.pos.y,
 130               request.pos.x + surface->get_width(),
 131               request.pos.y + surface->get_height(),
 132               surface_data->get_uv_left(),
 133               surface_data->get_uv_top(),
 134               surface_data->get_uv_right(),
 135               surface_data->get_uv_bottom(),
 136               request.angle,
 137               request.alpha,
 138               request.color,
 139               request.blend,
 140               request.drawing_effect);
 141 }
 142
 143 void
 144 GLRenderer::draw_surface_part(const DrawingRequest& request)
 145 {
 146   const SurfacePartRequest* surfacepartrequest
 147     = (SurfacePartRequest*) request.request_data;
 148   const Surface* surface = surfacepartrequest->surface;
 149   boost::shared_ptr<GLTexture> gltexture = boost::dynamic_pointer_cast<GLTexture>(surface->get_texture());
 150   GLSurfaceData *surface_data = reinterpret_cast<GLSurfaceData *>(surface->get_surface_data());
 151
 152   float uv_width = surface_data->get_uv_right() - surface_data->get_uv_left();
 153   float uv_height = surface_data->get_uv_bottom() - surface_data->get_uv_top();
 154
 155   float uv_left = surface_data->get_uv_left() + (uv_width * surfacepartrequest->source.x) / surface->get_width();
 156   float uv_top = surface_data->get_uv_top() + (uv_height * surfacepartrequest->source.y) / surface->get_height();
 157   float uv_right = surface_data->get_uv_left() + (uv_width * (surfacepartrequest->source.x + surfacepartrequest->size.x)) / surface->get_width();
 158   float uv_bottom = surface_data->get_uv_top() + (uv_height * (surfacepartrequest->source.y + surfacepartrequest->size.y)) / surface->get_height();
 159
 160   GLuint th = gltexture->get_handle();
 161   if (th != last_texture) {
 162     last_texture = th;
 163     glBindTexture(GL_TEXTURE_2D, th);
 164   }
 165   intern_draw(request.pos.x, request.pos.y,
 166               request.pos.x + surfacepartrequest->size.x,
 167               request.pos.y + surfacepartrequest->size.y,
 168               uv_left,
 169               uv_top,
 170               uv_right,
 171               uv_bottom,
 172               0.0,
 173               request.alpha,
 174               request.color,
 175               Blend(),
 176               request.drawing_effect);
 177 }
 178
 179 void
 180 GLRenderer::draw_gradient(const DrawingRequest& request)
 181 {
 182   const GradientRequest* gradientrequest
 183     = (GradientRequest*) request.request_data;
 184   const Color& top = gradientrequest->top;
 185   const Color& bottom = gradientrequest->bottom;
 186
 187   glDisable(GL_TEXTURE_2D);
 188   glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 189   glEnableClientState(GL_COLOR_ARRAY);
 190
 191   float vertices[] = {
 192     0, 0,
 193     float(SCREEN_WIDTH), 0,
 194     float(SCREEN_WIDTH), float(SCREEN_HEIGHT),
 195     0, float(SCREEN_HEIGHT)
 196   };
 197   glVertexPointer(2, GL_FLOAT, 0, vertices);
 198
 199   float colors[] = {
 200     top.red, top.green, top.blue, top.alpha,
 201     top.red, top.green, top.blue, top.alpha,
 202     bottom.red, bottom.green, bottom.blue, bottom.alpha,
 203     bottom.red, bottom.green, bottom.blue, bottom.alpha,
 204   };
 205   glColorPointer(4, GL_FLOAT, 0, colors);
 206
 207   glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
 208
 209   glDisableClientState(GL_COLOR_ARRAY);
 210   glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 211
 212   glEnable(GL_TEXTURE_2D);
 213   glColor4f(1, 1, 1, 1);
 214 }
 215
 216 void
 217 GLRenderer::draw_filled_rect(const DrawingRequest& request)
 218 {
 219   const FillRectRequest* fillrectrequest
 220     = (FillRectRequest*) request.request_data;
 221
 222   glDisable(GL_TEXTURE_2D);
 223   glColor4f(fillrectrequest->color.red, fillrectrequest->color.green,
 224             fillrectrequest->color.blue, fillrectrequest->color.alpha);
 225   glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 226
 227   if (fillrectrequest->radius != 0.0f)
 228   {
 229     // draw round rect
 230     // Keep radius in the limits, so that we get a circle instead of
 231     // just graphic junk
 232     float radius = std::min(fillrectrequest->radius,
 233                             std::min(fillrectrequest->size.x/2,
 234                                      fillrectrequest->size.y/2));
 235
 236     // inner rectangle
 237     Rectf irect(request.pos.x    + radius,
 238                request.pos.y    + radius,
 239                request.pos.x + fillrectrequest->size.x - radius,
 240                request.pos.y + fillrectrequest->size.y - radius);
 241
 242     int n = 8;
 243     int p = 0;
 244     std::vector<float> vertices((n+1) * 4 * 2);
 245
 246     for(int i = 0; i <= n; ++i)
 247     {
 248       float x = sinf(i * (M_PI/2) / n) * radius;
 249       float y = cosf(i * (M_PI/2) / n) * radius;
 250
 251       vertices[p++] = irect.get_left() - x;
 252       vertices[p++] = irect.get_top()  - y;
 253
 254       vertices[p++] = irect.get_right() + x;
 255       vertices[p++] = irect.get_top()   - y;
 256     }
 257
 258     for(int i = 0; i <= n; ++i)
 259     {
 260       float x = cosf(i * (M_PI/2) / n) * radius;
 261       float y = sinf(i * (M_PI/2) / n) * radius;
 262
 263       vertices[p++] = irect.get_left()   - x;
 264       vertices[p++] = irect.get_bottom() + y;
 265
 266       vertices[p++] = irect.get_right()  + x;
 267       vertices[p++] = irect.get_bottom() + y;
 268     }
 269
 270     glVertexPointer(2, GL_FLOAT, 0, &*vertices.begin());
 271     glDrawArrays(GL_TRIANGLE_STRIP, 0,  vertices.size()/2);
 272   }
 273   else
 274   {
 275     float x = request.pos.x;
 276     float y = request.pos.y;
 277     float w = fillrectrequest->size.x;
 278     float h = fillrectrequest->size.y;
 279
 280     float vertices[] = {
 281       x,   y,
 282       x+w, y,
 283       x+w, y+h,
 284       x,   y+h
 285     };
 286     glVertexPointer(2, GL_FLOAT, 0, vertices);
 287
 288     glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
 289   }
 290
 291   glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 292   glEnable(GL_TEXTURE_2D);
 293   glColor4f(1, 1, 1, 1);
 294 }
 295
 296 void
 297 GLRenderer::draw_inverse_ellipse(const DrawingRequest& request)
 298 {
 299   const InverseEllipseRequest* ellipse = (InverseEllipseRequest*)request.request_data;
 300
 301   glDisable(GL_TEXTURE_2D);
 302   glColor4f(ellipse->color.red,  ellipse->color.green,
 303             ellipse->color.blue, ellipse->color.alpha);
 304
 305   float x = request.pos.x;
 306   float y = request.pos.y;
 307   float w = ellipse->size.x/2.0f;
 308   float h = ellipse->size.y/2.0f;
 309
 310   static const int slices = 16;
 311   static const int points = (slices+1) * 12;
 312
 313   float vertices[points * 2];
 314   int   p = 0;
 315
 316   // Bottom
 317   vertices[p++] = SCREEN_WIDTH; vertices[p++] = SCREEN_HEIGHT;
 318   vertices[p++] = 0;            vertices[p++] = SCREEN_HEIGHT;
 319   vertices[p++] = x;            vertices[p++] = y+h;
 320
 321   // Top
 322   vertices[p++] = SCREEN_WIDTH; vertices[p++] = 0;
 323   vertices[p++] = 0;            vertices[p++] = 0;
 324   vertices[p++] = x;            vertices[p++] = y-h;
 325
 326   // Left
 327   vertices[p++] = SCREEN_WIDTH; vertices[p++] = 0;
 328   vertices[p++] = SCREEN_WIDTH; vertices[p++] = SCREEN_HEIGHT;
 329   vertices[p++] = x+w;          vertices[p++] = y;
 330
 331   // Right
 332   vertices[p++] = 0;            vertices[p++] = 0;
 333   vertices[p++] = 0;            vertices[p++] = SCREEN_HEIGHT;
 334   vertices[p++] = x-w;          vertices[p++] = y;
 335
 336   for(int i = 0; i < slices; ++i)
 337   {
 338     float ex1 = sinf(M_PI/2 / slices * i) * w;
 339     float ey1 = cosf(M_PI/2 / slices * i) * h;
 340
 341     float ex2 = sinf(M_PI/2 / slices * (i+1)) * w;
 342     float ey2 = cosf(M_PI/2 / slices * (i+1)) * h;
 343
 344     // Bottom/Right
 345     vertices[p++] = SCREEN_WIDTH; vertices[p++] = SCREEN_HEIGHT;
 346     vertices[p++] = x + ex1;      vertices[p++] = y + ey1;
 347     vertices[p++] = x + ex2;      vertices[p++] = y + ey2;
 348
 349     // Top/Left
 350     vertices[p++] = 0;            vertices[p++] = 0;
 351     vertices[p++] = x - ex1;      vertices[p++] = y - ey1;
 352     vertices[p++] = x - ex2;      vertices[p++] = y - ey2;
 353
 354     // Top/Right
 355     vertices[p++] = SCREEN_WIDTH; vertices[p++] = 0;
 356     vertices[p++] = x + ex1;      vertices[p++] = y - ey1;
 357     vertices[p++] = x + ex2;      vertices[p++] = y - ey2;
 358
 359     // Bottom/Left
 360     vertices[p++] = 0;            vertices[p++] = SCREEN_HEIGHT;
 361     vertices[p++] = x - ex1;      vertices[p++] = y + ey1;
 362     vertices[p++] = x - ex2;      vertices[p++] = y + ey2;
 363   }
 364
 365   glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 366   glVertexPointer(2, GL_FLOAT, 0, vertices);
 367
 368   glDrawArrays(GL_TRIANGLES, 0, points);
 369
 370   glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 371
 372   glEnable(GL_TEXTURE_2D);
 373   glColor4f(1, 1, 1, 1);
 374 }
 375
 376 void
 377 GLRenderer::do_take_screenshot()
 378 {
 379   // [Christoph] TODO: Yes, this method also takes care of the actual disk I/O. Split it?
 380
 381   SDL_Surface *shot_surf;
 382   // create surface to hold screenshot
 383 #if SDL_BYTEORDER == SDL_BIG_ENDIAN
 384   shot_surf = SDL_CreateRGBSurface(SDL_SWSURFACE, SCREEN_WIDTH, SCREEN_HEIGHT, 24, 0x00FF0000, 0x0000FF00, 0x000000FF, 0);
 385 #else
 386   shot_surf = SDL_CreateRGBSurface(SDL_SWSURFACE, SCREEN_WIDTH, SCREEN_HEIGHT, 24, 0x000000FF, 0x0000FF00, 0x00FF0000, 0);
 387 #endif
 388   if (!shot_surf) {
 389     log_warning << "Could not create RGB Surface to contain screenshot" << std::endl;
 390     return;
 391   }
 392
 393   // read pixels into array
 394   char* pixels = new char[3 * SCREEN_WIDTH * SCREEN_HEIGHT];
 395   if (!pixels) {
 396     log_warning << "Could not allocate memory to store screenshot" << std::endl;
 397     SDL_FreeSurface(shot_surf);
 398     return;
 399   }
 400   glPixelStorei(GL_PACK_ALIGNMENT, 1);
 401   glReadPixels(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT, GL_RGB, GL_UNSIGNED_BYTE, pixels);
 402
 403   // copy array line-by-line
 404   for (int i = 0; i < SCREEN_HEIGHT; i++) {
 405     char* src = pixels + (3 * SCREEN_WIDTH * (SCREEN_HEIGHT - i - 1));
 406     if(SDL_MUSTLOCK(shot_surf))
 407     {
 408       SDL_LockSurface(shot_surf);
 409     }
 410     char* dst = ((char*)shot_surf->pixels) + i * shot_surf->pitch;
 411     memcpy(dst, src, 3 * SCREEN_WIDTH);
 412     if(SDL_MUSTLOCK(shot_surf))
 413     {
 414       SDL_UnlockSurface(shot_surf);
 415     }
 416   }
 417
 418   // free array
 419   delete[](pixels);
 420
 421   // save screenshot
 422   static const std::string writeDir = PHYSFS_getWriteDir();
 423   static const std::string dirSep = PHYSFS_getDirSeparator();
 424   static const std::string baseName = "screenshot";
 425   static const std::string fileExt = ".bmp";
 426   std::string fullFilename;
 427   for (int num = 0; num < 1000; num++) {
 428     std::ostringstream oss;
 429     oss << baseName;
 430     oss << std::setw(3) << std::setfill('0') << num;
 431     oss << fileExt;
 432     std::string fileName = oss.str();
 433     fullFilename = writeDir + dirSep + fileName;
 434     if (!PHYSFS_exists(fileName.c_str())) {
 435       SDL_SaveBMP(shot_surf, fullFilename.c_str());
 436       log_debug << "Wrote screenshot to \"" << fullFilename << "\"" << std::endl;
 437       SDL_FreeSurface(shot_surf);
 438       return;
 439     }
 440   }
 441   log_warning << "Did not save screenshot, because all files up to \"" << fullFilename << "\" already existed" << std::endl;
 442   SDL_FreeSurface(shot_surf);
 443 }
 444
 445 void
 446 GLRenderer::flip()
 447 {
 448   assert_gl("drawing");
 449   SDL_GL_SwapWindow(screen)();
 450 }
 451
 452 void
 453 GLRenderer::resize(int w, int h)
 454 {
 455   // This causes the screen to go black, which is annoying, but seems
 456   // unavoidable with SDL at the moment
 457   SDL_CreateWindow(SDL_GL_CreateContext(w, h, 0, SDL_OPENGL | SDL_RESIZABLE));
 458
 459   g_config->window_size = Size(w, h);
 460
 461   apply_config();
 462 }
 463
 464 void
 465 GLRenderer::apply_config()
 466 {
 467   if (false)
 468   {
 469     log_info << "Applying Config:"
 470              << "\n  Desktop: " << desktop_size.width << "x" << desktop_size.height
 471              << "\n  Window:  " << g_config->window_size
 472              << "\n  FullRes: " << g_config->fullscreen_size
 473              << "\n  Aspect:  " << g_config->aspect_size
 474              << "\n  Magnif:  " << g_config->magnification
 475              << std::endl;
 476   }
 477
 478   float target_aspect = static_cast<float>(desktop_size.width) / static_cast<float>(desktop_size.height);
 479   if (g_config->aspect_size != Size(0, 0))
 480   {
 481     target_aspect = float(g_config->aspect_size.width) / float(g_config->aspect_size.height);
 482   }
 483
 484   float desktop_aspect = 4.0f / 3.0f; // random default fallback guess
 485   if (desktop_size.width != -1 && desktop_size.height != -1)
 486   {
 487     desktop_aspect = float(desktop_size.width) / float(desktop_size.height);
 488   }
 489
 490   Size screen_size;
 491
 492   // Get the screen width
 493   if (g_config->use_fullscreen)
 494   {
 495     screen_size = g_config->fullscreen_size;
 496     desktop_aspect = float(screen_size.width) / float(screen_size.height);
 497   }
 498   else
 499   {
 500     screen_size = g_config->window_size;
 501   }
 502
 503   apply_video_mode(screen_size, g_config->use_fullscreen);
 504
 505   if (target_aspect > 1.0f)
 506   {
 507     SCREEN_WIDTH  = static_cast<int>(screen_size.width * (target_aspect / desktop_aspect));
 508     SCREEN_HEIGHT = static_cast<int>(screen_size.height);
 509   }
 510   else
 511   {
 512     SCREEN_WIDTH  = static_cast<int>(screen_size.width);
 513     SCREEN_HEIGHT = static_cast<int>(screen_size.height  * (target_aspect / desktop_aspect));
 514   }
 515
 516   Size max_size(1280, 800);
 517   Size min_size(640, 480);
 518
 519   if (g_config->magnification == 0.0f) // Magic value that means 'minfill'
 520   {
 521     // This scales SCREEN_WIDTH/SCREEN_HEIGHT so that they never excede
 522     // max_size.width/max_size.height resp. min_size.width/min_size.height
 523     if (SCREEN_WIDTH > max_size.width || SCREEN_HEIGHT > max_size.height)
 524     {
 525       float scale1  = float(max_size.width)/SCREEN_WIDTH;
 526       float scale2  = float(max_size.height)/SCREEN_HEIGHT;
 527       float scale   = (scale1 < scale2) ? scale1 : scale2;
 528       SCREEN_WIDTH  = static_cast<int>(SCREEN_WIDTH  * scale);
 529       SCREEN_HEIGHT = static_cast<int>(SCREEN_HEIGHT * scale);
 530     }
 531     else if (SCREEN_WIDTH < min_size.width || SCREEN_HEIGHT < min_size.height)
 532     {
 533       float scale1  = float(min_size.width)/SCREEN_WIDTH;
 534       float scale2  = float(min_size.height)/SCREEN_HEIGHT;
 535       float scale   = (scale1 < scale2) ? scale1 : scale2;
 536       SCREEN_WIDTH  = static_cast<int>(SCREEN_WIDTH  * scale);
 537       SCREEN_HEIGHT = static_cast<int>(SCREEN_HEIGHT * scale);
 538     }
 539
 540
 541     glViewport(0, 0, screen_size.width, screen_size.height);
 542   }
 543   else
 544   {
 545     SCREEN_WIDTH  = static_cast<int>(SCREEN_WIDTH  / g_config->magnification);
 546     SCREEN_HEIGHT = static_cast<int>(SCREEN_HEIGHT / g_config->magnification);
 547
 548     // This works by adding black borders around the screen to limit
 549     // SCREEN_WIDTH/SCREEN_HEIGHT to max_size.width/max_size.height
 550     Size new_size = screen_size;
 551
 552     if (SCREEN_WIDTH > max_size.width)
 553     {
 554       new_size.width = static_cast<int>((float) new_size.width * float(max_size.width)/SCREEN_WIDTH);
 555       SCREEN_WIDTH = static_cast<int>(max_size.width);
 556     }
 557
 558     if (SCREEN_HEIGHT > max_size.height)
 559     {
 560       new_size.height = static_cast<int>((float) new_size.height * float(max_size.height)/SCREEN_HEIGHT);
 561       SCREEN_HEIGHT = static_cast<int>(max_size.height);
 562     }
 563
 564     // Clear both buffers so that we get a clean black border without junk
 565     glClear(GL_COLOR_BUFFER_BIT);
 566     SDL_GL_SwapWindow(screen);
 567     glClear(GL_COLOR_BUFFER_BIT);
 568     SDL_GL_SwapWindow(screen);
 569
 570     glViewport(std::max(0, (screen_size.width  - new_size.width)  / 2),
 571                std::max(0, (screen_size.height - new_size.height) / 2),
 572                std::min(new_size.width,  screen_size.width),
 573                std::min(new_size.height, screen_size.height));
 574   }
 575
 576   glMatrixMode(GL_PROJECTION);
 577   glLoadIdentity();
 578
 579   glOrtho(0, SCREEN_WIDTH, SCREEN_HEIGHT, 0, -1, 1);
 580
 581   glMatrixMode(GL_MODELVIEW);
 582   glLoadIdentity();
 583   glTranslatef(0, 0, 0);
 584   check_gl_error("Setting up view matrices");
 585 }
 586
 587 void
 588 GLRenderer::apply_video_mode(const Size& size, bool fullscreen)
 589 {
 590   // Only change video mode when its different from the current one
 591   if (screen_size != size || fullscreen_active != fullscreen)
 592   {
 593     int flags = SDL_OPENGL;
 594
 595     if (fullscreen)
 596     {
 597       flags |= SDL_FULLSCREEN;
 598     }
 599     else
 600     {
 601       flags |= SDL_RESIZABLE;
 602     }
 603
 604     if (SDL_Surface *screen = SDL_CreateWindow(SDL_GL_CreateContext( size.width, size.height, 0, flags)))
 605     {
 606       screen_size = Size(screen->w, screen->h);
 607       fullscreen_active = fullscreen;
 608     }
 609     else
 610     {
 611       std::ostringstream msg;
 612       msg << "Couldn't set video mode " << size.width << "x" << size.height << ": " << SDL_GetError();
 613       throw std::runtime_error(msg.str());
 614     }
 615   }
 616 }
 617
 618 /* EOF */