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 "SDL.h"
  24
  25 #include "supertux/gameconfig.hpp"
  26 #include "supertux/globals.hpp"
  27 #include "video/drawing_request.hpp"
  28 #include "video/gl/gl_surface_data.hpp"
  29 #include "video/gl/gl_texture.hpp"
  30 #define LIGHTMAP_DIV 5
  31
  32 #ifdef GL_VERSION_ES_CM_1_0
  33 #  define glOrtho glOrthof
  34 #endif
  35
  36 GLRenderer::GLRenderer() :
  37   window(),
  38   desktop_size(-1, -1),
  39   screen_size(-1, -1),
  40   fullscreen_active(false),
  41   last_texture(static_cast<GLuint> (-1))
  42 {
  43   Renderer::instance_ = this;
  44
  45   SDL_DisplayMode mode;
  46   SDL_GetCurrentDisplayMode(0, &mode);
  47   desktop_size = Size(mode.w, mode.h);
  48
  49   if(texture_manager != 0)
  50     texture_manager->save_textures();
  51
  52   if(g_config->try_vsync) {
  53     /* we want vsync for smooth scrolling */
  54     if (SDL_GL_SetSwapInterval(-1) != 0)
  55     {
  56       log_info << "no support for late swap tearing vsync: " << SDL_GetError() << std::endl;
  57       if (SDL_GL_SetSwapInterval(1))
  58       {
  59         log_info << "no support for vsync: " << SDL_GetError() << std::endl;
  60       }
  61     }
  62   }
  63
  64   SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
  65
  66   SDL_GL_SetAttribute(SDL_GL_RED_SIZE,   5);
  67   SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 5);
  68   SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE,  5);
  69
  70   if(g_config->use_fullscreen)
  71   {
  72     apply_video_mode(g_config->fullscreen_size, true);
  73   }
  74   else
  75   {
  76     apply_video_mode(g_config->window_size, false);
  77   }
  78
  79   // setup opengl state and transform
  80   glDisable(GL_DEPTH_TEST);
  81   glDisable(GL_CULL_FACE);
  82   glEnable(GL_TEXTURE_2D);
  83   glEnable(GL_BLEND);
  84   glEnableClientState(GL_VERTEX_ARRAY);
  85   glEnableClientState(GL_TEXTURE_COORD_ARRAY);
  86   glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
  87
  88   // Init the projection matrix, viewport and stuff
  89   apply_config();
  90
  91   if(texture_manager == 0)
  92     texture_manager = new TextureManager();
  93   else
  94     texture_manager->reload_textures();
  95
  96 #ifndef GL_VERSION_ES_CM_1_0
  97   GLenum err = glewInit();
  98   if (GLEW_OK != err)
  99   {
 100     std::ostringstream out;
 101     out << "GLRenderer: " << glewGetErrorString(err);
 102     throw std::runtime_error(out.str());
 103   }
 104   log_info << "Using GLEW " << glewGetString(GLEW_VERSION) << std::endl;
 105   log_info << "GLEW_ARB_texture_non_power_of_two: " << static_cast<int>(GLEW_ARB_texture_non_power_of_two) << std::endl;
 106 #endif
 107 }
 108
 109 GLRenderer::~GLRenderer()
 110 {
 111   SDL_GL_DeleteContext(glcontext);
 112   SDL_DestroyWindow(window);
 113 }
 114
 115 void
 116 GLRenderer::draw_surface(const DrawingRequest& request)
 117 {
 118   const Surface* surface = (const Surface*) request.request_data;
 119   if(surface == NULL)
 120   {
 121     return;
 122   }
 123   GLTexture* gltexture = static_cast<GLTexture*>(surface->get_texture().get());
 124   if(gltexture == NULL)
 125   {
 126     return;
 127   }
 128   GLSurfaceData *surface_data = static_cast<GLSurfaceData*>(surface->get_surface_data());
 129   if(surface_data == NULL)
 130   {
 131     return;
 132   }
 133
 134   GLuint th = gltexture->get_handle();
 135   if (th != last_texture) {
 136     last_texture = th;
 137     glBindTexture(GL_TEXTURE_2D, th);
 138   }
 139   intern_draw(request.pos.x, request.pos.y,
 140               request.pos.x + surface->get_width(),
 141               request.pos.y + surface->get_height(),
 142               surface_data->get_uv_left(),
 143               surface_data->get_uv_top(),
 144               surface_data->get_uv_right(),
 145               surface_data->get_uv_bottom(),
 146               request.angle,
 147               request.alpha,
 148               request.color,
 149               request.blend,
 150               request.drawing_effect);
 151 }
 152
 153 void
 154 GLRenderer::draw_surface_part(const DrawingRequest& request)
 155 {
 156   const SurfacePartRequest* surfacepartrequest
 157     = (SurfacePartRequest*) request.request_data;
 158   const Surface* surface = surfacepartrequest->surface;
 159   boost::shared_ptr<GLTexture> gltexture = boost::dynamic_pointer_cast<GLTexture>(surface->get_texture());
 160   GLSurfaceData *surface_data = reinterpret_cast<GLSurfaceData *>(surface->get_surface_data());
 161
 162   float uv_width = surface_data->get_uv_right() - surface_data->get_uv_left();
 163   float uv_height = surface_data->get_uv_bottom() - surface_data->get_uv_top();
 164
 165   float uv_left = surface_data->get_uv_left() + (uv_width * surfacepartrequest->source.x) / surface->get_width();
 166   float uv_top = surface_data->get_uv_top() + (uv_height * surfacepartrequest->source.y) / surface->get_height();
 167   float uv_right = surface_data->get_uv_left() + (uv_width * (surfacepartrequest->source.x + surfacepartrequest->size.x)) / surface->get_width();
 168   float uv_bottom = surface_data->get_uv_top() + (uv_height * (surfacepartrequest->source.y + surfacepartrequest->size.y)) / surface->get_height();
 169
 170   GLuint th = gltexture->get_handle();
 171   if (th != last_texture) {
 172     last_texture = th;
 173     glBindTexture(GL_TEXTURE_2D, th);
 174   }
 175   intern_draw(request.pos.x, request.pos.y,
 176               request.pos.x + surfacepartrequest->size.x,
 177               request.pos.y + surfacepartrequest->size.y,
 178               uv_left,
 179               uv_top,
 180               uv_right,
 181               uv_bottom,
 182               0.0,
 183               request.alpha,
 184               request.color,
 185               Blend(),
 186               request.drawing_effect);
 187 }
 188
 189 void
 190 GLRenderer::draw_gradient(const DrawingRequest& request)
 191 {
 192   const GradientRequest* gradientrequest
 193     = (GradientRequest*) request.request_data;
 194   const Color& top = gradientrequest->top;
 195   const Color& bottom = gradientrequest->bottom;
 196
 197   glDisable(GL_TEXTURE_2D);
 198   glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 199   glEnableClientState(GL_COLOR_ARRAY);
 200
 201   float vertices[] = {
 202     0, 0,
 203     float(SCREEN_WIDTH), 0,
 204     float(SCREEN_WIDTH), float(SCREEN_HEIGHT),
 205     0, float(SCREEN_HEIGHT)
 206   };
 207   glVertexPointer(2, GL_FLOAT, 0, vertices);
 208
 209   float colors[] = {
 210     top.red, top.green, top.blue, top.alpha,
 211     top.red, top.green, top.blue, top.alpha,
 212     bottom.red, bottom.green, bottom.blue, bottom.alpha,
 213     bottom.red, bottom.green, bottom.blue, bottom.alpha,
 214   };
 215   glColorPointer(4, GL_FLOAT, 0, colors);
 216
 217   glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
 218
 219   glDisableClientState(GL_COLOR_ARRAY);
 220   glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 221
 222   glEnable(GL_TEXTURE_2D);
 223   glColor4f(1, 1, 1, 1);
 224 }
 225
 226 void
 227 GLRenderer::draw_filled_rect(const DrawingRequest& request)
 228 {
 229   const FillRectRequest* fillrectrequest
 230     = (FillRectRequest*) request.request_data;
 231
 232   glDisable(GL_TEXTURE_2D);
 233   glColor4f(fillrectrequest->color.red, fillrectrequest->color.green,
 234             fillrectrequest->color.blue, fillrectrequest->color.alpha);
 235   glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 236
 237   if (fillrectrequest->radius != 0.0f)
 238   {
 239     // draw round rect
 240     // Keep radius in the limits, so that we get a circle instead of
 241     // just graphic junk
 242     float radius = std::min(fillrectrequest->radius,
 243                             std::min(fillrectrequest->size.x/2,
 244                                      fillrectrequest->size.y/2));
 245
 246     // inner rectangle
 247     Rectf irect(request.pos.x    + radius,
 248                request.pos.y    + radius,
 249                request.pos.x + fillrectrequest->size.x - radius,
 250                request.pos.y + fillrectrequest->size.y - radius);
 251
 252     int n = 8;
 253     int p = 0;
 254     std::vector<float> vertices((n+1) * 4 * 2);
 255
 256     for(int i = 0; i <= n; ++i)
 257     {
 258       float x = sinf(i * (M_PI/2) / n) * radius;
 259       float y = cosf(i * (M_PI/2) / n) * radius;
 260
 261       vertices[p++] = irect.get_left() - x;
 262       vertices[p++] = irect.get_top()  - y;
 263
 264       vertices[p++] = irect.get_right() + x;
 265       vertices[p++] = irect.get_top()   - y;
 266     }
 267
 268     for(int i = 0; i <= n; ++i)
 269     {
 270       float x = cosf(i * (M_PI/2) / n) * radius;
 271       float y = sinf(i * (M_PI/2) / n) * radius;
 272
 273       vertices[p++] = irect.get_left()   - x;
 274       vertices[p++] = irect.get_bottom() + y;
 275
 276       vertices[p++] = irect.get_right()  + x;
 277       vertices[p++] = irect.get_bottom() + y;
 278     }
 279
 280     glVertexPointer(2, GL_FLOAT, 0, &*vertices.begin());
 281     glDrawArrays(GL_TRIANGLE_STRIP, 0,  vertices.size()/2);
 282   }
 283   else
 284   {
 285     float x = request.pos.x;
 286     float y = request.pos.y;
 287     float w = fillrectrequest->size.x;
 288     float h = fillrectrequest->size.y;
 289
 290     float vertices[] = {
 291       x,   y,
 292       x+w, y,
 293       x+w, y+h,
 294       x,   y+h
 295     };
 296     glVertexPointer(2, GL_FLOAT, 0, vertices);
 297
 298     glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
 299   }
 300
 301   glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 302   glEnable(GL_TEXTURE_2D);
 303   glColor4f(1, 1, 1, 1);
 304 }
 305
 306 void
 307 GLRenderer::draw_inverse_ellipse(const DrawingRequest& request)
 308 {
 309   const InverseEllipseRequest* ellipse = (InverseEllipseRequest*)request.request_data;
 310
 311   glDisable(GL_TEXTURE_2D);
 312   glColor4f(ellipse->color.red,  ellipse->color.green,
 313             ellipse->color.blue, ellipse->color.alpha);
 314
 315   float x = request.pos.x;
 316   float y = request.pos.y;
 317   float w = ellipse->size.x/2.0f;
 318   float h = ellipse->size.y/2.0f;
 319
 320   static const int slices = 16;
 321   static const int points = (slices+1) * 12;
 322
 323   float vertices[points * 2];
 324   int   p = 0;
 325
 326   // Bottom
 327   vertices[p++] = SCREEN_WIDTH; vertices[p++] = SCREEN_HEIGHT;
 328   vertices[p++] = 0;            vertices[p++] = SCREEN_HEIGHT;
 329   vertices[p++] = x;            vertices[p++] = y+h;
 330
 331   // Top
 332   vertices[p++] = SCREEN_WIDTH; vertices[p++] = 0;
 333   vertices[p++] = 0;            vertices[p++] = 0;
 334   vertices[p++] = x;            vertices[p++] = y-h;
 335
 336   // Left
 337   vertices[p++] = SCREEN_WIDTH; vertices[p++] = 0;
 338   vertices[p++] = SCREEN_WIDTH; vertices[p++] = SCREEN_HEIGHT;
 339   vertices[p++] = x+w;          vertices[p++] = y;
 340
 341   // Right
 342   vertices[p++] = 0;            vertices[p++] = 0;
 343   vertices[p++] = 0;            vertices[p++] = SCREEN_HEIGHT;
 344   vertices[p++] = x-w;          vertices[p++] = y;
 345
 346   for(int i = 0; i < slices; ++i)
 347   {
 348     float ex1 = sinf(M_PI/2 / slices * i) * w;
 349     float ey1 = cosf(M_PI/2 / slices * i) * h;
 350
 351     float ex2 = sinf(M_PI/2 / slices * (i+1)) * w;
 352     float ey2 = cosf(M_PI/2 / slices * (i+1)) * h;
 353
 354     // Bottom/Right
 355     vertices[p++] = SCREEN_WIDTH; vertices[p++] = SCREEN_HEIGHT;
 356     vertices[p++] = x + ex1;      vertices[p++] = y + ey1;
 357     vertices[p++] = x + ex2;      vertices[p++] = y + ey2;
 358
 359     // Top/Left
 360     vertices[p++] = 0;            vertices[p++] = 0;
 361     vertices[p++] = x - ex1;      vertices[p++] = y - ey1;
 362     vertices[p++] = x - ex2;      vertices[p++] = y - ey2;
 363
 364     // Top/Right
 365     vertices[p++] = SCREEN_WIDTH; vertices[p++] = 0;
 366     vertices[p++] = x + ex1;      vertices[p++] = y - ey1;
 367     vertices[p++] = x + ex2;      vertices[p++] = y - ey2;
 368
 369     // Bottom/Left
 370     vertices[p++] = 0;            vertices[p++] = SCREEN_HEIGHT;
 371     vertices[p++] = x - ex1;      vertices[p++] = y + ey1;
 372     vertices[p++] = x - ex2;      vertices[p++] = y + ey2;
 373   }
 374
 375   glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 376   glVertexPointer(2, GL_FLOAT, 0, vertices);
 377
 378   glDrawArrays(GL_TRIANGLES, 0, points);
 379
 380   glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 381
 382   glEnable(GL_TEXTURE_2D);
 383   glColor4f(1, 1, 1, 1);
 384 }
 385
 386 void
 387 GLRenderer::do_take_screenshot()
 388 {
 389   // [Christoph] TODO: Yes, this method also takes care of the actual disk I/O. Split it?
 390
 391   SDL_Surface *shot_surf;
 392   // create surface to hold screenshot
 393 #if SDL_BYTEORDER == SDL_BIG_ENDIAN
 394   shot_surf = SDL_CreateRGBSurface(SDL_SWSURFACE, SCREEN_WIDTH, SCREEN_HEIGHT, 24, 0x00FF0000, 0x0000FF00, 0x000000FF, 0);
 395 #else
 396   shot_surf = SDL_CreateRGBSurface(SDL_SWSURFACE, SCREEN_WIDTH, SCREEN_HEIGHT, 24, 0x000000FF, 0x0000FF00, 0x00FF0000, 0);
 397 #endif
 398   if (!shot_surf) {
 399     log_warning << "Could not create RGB Surface to contain screenshot" << std::endl;
 400     return;
 401   }
 402
 403   // read pixels into array
 404   char* pixels = new char[3 * SCREEN_WIDTH * SCREEN_HEIGHT];
 405   if (!pixels) {
 406     log_warning << "Could not allocate memory to store screenshot" << std::endl;
 407     SDL_FreeSurface(shot_surf);
 408     return;
 409   }
 410   glPixelStorei(GL_PACK_ALIGNMENT, 1);
 411   glReadPixels(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT, GL_RGB, GL_UNSIGNED_BYTE, pixels);
 412
 413   // copy array line-by-line
 414   for (int i = 0; i < SCREEN_HEIGHT; i++) {
 415     char* src = pixels + (3 * SCREEN_WIDTH * (SCREEN_HEIGHT - i - 1));
 416     if(SDL_MUSTLOCK(shot_surf))
 417     {
 418       SDL_LockSurface(shot_surf);
 419     }
 420     char* dst = ((char*)shot_surf->pixels) + i * shot_surf->pitch;
 421     memcpy(dst, src, 3 * SCREEN_WIDTH);
 422     if(SDL_MUSTLOCK(shot_surf))
 423     {
 424       SDL_UnlockSurface(shot_surf);
 425     }
 426   }
 427
 428   // free array
 429   delete[](pixels);
 430
 431   // save screenshot
 432   static const std::string writeDir = PHYSFS_getWriteDir();
 433   static const std::string dirSep = PHYSFS_getDirSeparator();
 434   static const std::string baseName = "screenshot";
 435   static const std::string fileExt = ".bmp";
 436   std::string fullFilename;
 437   for (int num = 0; num < 1000; num++) {
 438     std::ostringstream oss;
 439     oss << baseName;
 440     oss << std::setw(3) << std::setfill('0') << num;
 441     oss << fileExt;
 442     std::string fileName = oss.str();
 443     fullFilename = writeDir + dirSep + fileName;
 444     if (!PHYSFS_exists(fileName.c_str())) {
 445       SDL_SaveBMP(shot_surf, fullFilename.c_str());
 446       log_debug << "Wrote screenshot to \"" << fullFilename << "\"" << std::endl;
 447       SDL_FreeSurface(shot_surf);
 448       return;
 449     }
 450   }
 451   log_warning << "Did not save screenshot, because all files up to \"" << fullFilename << "\" already existed" << std::endl;
 452   SDL_FreeSurface(shot_surf);
 453 }
 454
 455 void
 456 GLRenderer::flip()
 457 {
 458   assert_gl("drawing");
 459   SDL_GL_SwapWindow(window);
 460 }
 461
 462 void
 463 GLRenderer::resize(int w, int h)
 464 {
 465   g_config->window_size = Size(w, h);
 466
 467   PHYSICAL_SCREEN_WIDTH = w;
 468   PHYSICAL_SCREEN_HEIGHT = h;
 469
 470   apply_config();
 471 }
 472
 473 void
 474 GLRenderer::apply_config()
 475 {
 476   if (false)
 477   {
 478     log_info << "Applying Config:"
 479              << "\n  Desktop: " << desktop_size.width << "x" << desktop_size.height
 480              << "\n  Window:  " << g_config->window_size
 481              << "\n  FullRes: " << g_config->fullscreen_size
 482              << "\n  Aspect:  " << g_config->aspect_size
 483              << "\n  Magnif:  " << g_config->magnification
 484              << std::endl;
 485   }
 486
 487   float target_aspect = static_cast<float>(desktop_size.width) / static_cast<float>(desktop_size.height);
 488   if (g_config->aspect_size != Size(0, 0))
 489   {
 490     target_aspect = float(g_config->aspect_size.width) / float(g_config->aspect_size.height);
 491   }
 492
 493   float desktop_aspect = 4.0f / 3.0f; // random default fallback guess
 494   if (desktop_size.width != -1 && desktop_size.height != -1)
 495   {
 496     desktop_aspect = float(desktop_size.width) / float(desktop_size.height);
 497   }
 498
 499   Size screen_size;
 500
 501   // Get the screen width
 502   if (g_config->use_fullscreen)
 503   {
 504     screen_size = g_config->fullscreen_size;
 505     desktop_aspect = float(screen_size.width) / float(screen_size.height);
 506   }
 507   else
 508   {
 509     screen_size = g_config->window_size;
 510   }
 511
 512   apply_video_mode(screen_size, g_config->use_fullscreen);
 513
 514   if (target_aspect > 1.0f)
 515   {
 516     SCREEN_WIDTH  = static_cast<int>(screen_size.width * (target_aspect / desktop_aspect));
 517     SCREEN_HEIGHT = static_cast<int>(screen_size.height);
 518   }
 519   else
 520   {
 521     SCREEN_WIDTH  = static_cast<int>(screen_size.width);
 522     SCREEN_HEIGHT = static_cast<int>(screen_size.height  * (target_aspect / desktop_aspect));
 523   }
 524
 525   Size max_size(1280, 800);
 526   Size min_size(640, 480);
 527
 528   if (g_config->magnification == 0.0f) // Magic value that means 'minfill'
 529   {
 530     // This scales SCREEN_WIDTH/SCREEN_HEIGHT so that they never excede
 531     // max_size.width/max_size.height resp. min_size.width/min_size.height
 532     if (SCREEN_WIDTH > max_size.width || SCREEN_HEIGHT > max_size.height)
 533     {
 534       float scale1  = float(max_size.width)/SCREEN_WIDTH;
 535       float scale2  = float(max_size.height)/SCREEN_HEIGHT;
 536       float scale   = (scale1 < scale2) ? scale1 : scale2;
 537       SCREEN_WIDTH  = static_cast<int>(SCREEN_WIDTH  * scale);
 538       SCREEN_HEIGHT = static_cast<int>(SCREEN_HEIGHT * scale);
 539     }
 540     else if (SCREEN_WIDTH < min_size.width || SCREEN_HEIGHT < min_size.height)
 541     {
 542       float scale1  = float(min_size.width)/SCREEN_WIDTH;
 543       float scale2  = float(min_size.height)/SCREEN_HEIGHT;
 544       float scale   = (scale1 < scale2) ? scale1 : scale2;
 545       SCREEN_WIDTH  = static_cast<int>(SCREEN_WIDTH  * scale);
 546       SCREEN_HEIGHT = static_cast<int>(SCREEN_HEIGHT * scale);
 547     }
 548
 549
 550     glViewport(0, 0, screen_size.width, screen_size.height);
 551   }
 552   else
 553   {
 554     SCREEN_WIDTH  = static_cast<int>(SCREEN_WIDTH  / g_config->magnification);
 555     SCREEN_HEIGHT = static_cast<int>(SCREEN_HEIGHT / g_config->magnification);
 556
 557     // This works by adding black borders around the screen to limit
 558     // SCREEN_WIDTH/SCREEN_HEIGHT to max_size.width/max_size.height
 559     Size new_size = screen_size;
 560
 561     if (SCREEN_WIDTH > max_size.width)
 562     {
 563       new_size.width = static_cast<int>((float) new_size.width * float(max_size.width)/SCREEN_WIDTH);
 564       SCREEN_WIDTH = static_cast<int>(max_size.width);
 565     }
 566
 567     if (SCREEN_HEIGHT > max_size.height)
 568     {
 569       new_size.height = static_cast<int>((float) new_size.height * float(max_size.height)/SCREEN_HEIGHT);
 570       SCREEN_HEIGHT = static_cast<int>(max_size.height);
 571     }
 572
 573     // Clear both buffers so that we get a clean black border without junk
 574     glClear(GL_COLOR_BUFFER_BIT);
 575     SDL_GL_SwapWindow(window);
 576     glClear(GL_COLOR_BUFFER_BIT);
 577     SDL_GL_SwapWindow(window);
 578
 579     glViewport(std::max(0, (screen_size.width  - new_size.width)  / 2),
 580                std::max(0, (screen_size.height - new_size.height) / 2),
 581                std::min(new_size.width,  screen_size.width),
 582                std::min(new_size.height, screen_size.height));
 583   }
 584
 585   glMatrixMode(GL_PROJECTION);
 586   glLoadIdentity();
 587
 588   glOrtho(0, SCREEN_WIDTH, SCREEN_HEIGHT, 0, -1, 1);
 589
 590   glMatrixMode(GL_MODELVIEW);
 591   glLoadIdentity();
 592   glTranslatef(0, 0, 0);
 593   check_gl_error("Setting up view matrices");
 594 }
 595
 596 void
 597 GLRenderer::apply_video_mode(const Size& size, bool fullscreen)
 598 {
 599   if (window)
 600   {
 601     SDL_SetWindowSize(window, size.width, size.height);
 602
 603     if (fullscreen)
 604     {
 605       int fullscreen_flags = SDL_WINDOW_FULLSCREEN; // SDL_WINDOW_FULLSCREEN_DESKTOP or 0
 606       SDL_SetWindowDisplayMode(window, NULL);
 607
 608       SDL_DisplayMode mode;
 609       mode.format = SDL_PIXELFORMAT_RGB888;
 610       mode.w = g_config->fullscreen_size.width;
 611       mode.h = g_config->fullscreen_size.height;
 612       mode.refresh_rate = g_config->fullscreen_refresh_rate;
 613       mode.driverdata = 0;
 614
 615       if (SDL_SetWindowDisplayMode(window, &mode) != 0)
 616       {
 617         log_warning << "failed to set display mode: "
 618                     << mode.w << "x" << mode.h << "@" << mode.refresh_rate << ": "
 619                     << SDL_GetError() << std::endl;
 620       }
 621       else
 622       {
 623         SDL_SetWindowFullscreen(window, fullscreen_flags);
 624       }
 625     }
 626     else
 627     {
 628       SDL_SetWindowFullscreen(window, 0);
 629     }
 630   }
 631   else
 632   {
 633     // Only change video mode when its different from the current one
 634     if (screen_size != size || fullscreen_active != fullscreen)
 635     {
 636       int flags = SDL_WINDOW_OPENGL;
 637
 638       if (fullscreen)
 639       {
 640         flags |= SDL_WINDOW_FULLSCREEN;
 641       }
 642       else
 643       {
 644         flags |= SDL_WINDOW_RESIZABLE;
 645       }
 646
 647       window = SDL_CreateWindow("SuperTux",
 648                                 SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
 649                                 size.width, size.height,
 650                                 flags);
 651       if (!window)
 652       {
 653         std::ostringstream msg;
 654         msg << "Couldn't set video mode " << size.width << "x" << size.height << ": " << SDL_GetError();
 655         throw std::runtime_error(msg.str());
 656       }
 657       else
 658       {
 659         glcontext = SDL_GL_CreateContext(window);
 660         screen_size = size;
 661
 662         PHYSICAL_SCREEN_WIDTH = size.width;
 663         PHYSICAL_SCREEN_HEIGHT = size.height;
 664
 665         SCREEN_WIDTH = size.width;
 666         SCREEN_HEIGHT = size.height;
 667
 668         fullscreen_active = fullscreen;
 669       }
 670     }
 671   }
 672 }
 673
 674 void
 675 GLRenderer::set_gamma(float gamma)
 676 {
 677   Uint16 ramp[256];
 678   SDL_CalculateGammaRamp(gamma, ramp);
 679   SDL_SetWindowGammaRamp(window, ramp, ramp, ramp);
 680 }
 681
 682 /* EOF */