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 #if SDL_MAJOR_VERSION > 1 || SDL_MINOR_VERSION > 2 || (SDL_MINOR_VERSION == 2 && SDL_PATCHLEVEL >= 10)
  46   // unfortunately only newer SDLs have these infos.
  47   // This must be called before SDL_SetVideoMode() or it will return
  48   // the window size instead of the desktop size.
  49 #ifdef OLD_SDL1
  50   const SDL_VideoInfo *info = SDL_GetVideoInfo();
  51   if (info)
  52   {
  53       desktop_size = Size(info->current_w, info->current_h);
  54   }
  55 #else
  56   desktop_size = Size(1920, 1080);
  57 #endif
  58 #endif
  59
  60   if(texture_manager != 0)
  61     texture_manager->save_textures();
  62
  63   if(g_config->try_vsync) {
  64     /* we want vsync for smooth scrolling */
  65     if (SDL_GL_SetSwapInterval(-1) != 0)
  66     {
  67       log_info << "no support for late swap tearing vsync: " << SDL_GetError() << std::endl;
  68       if (SDL_GL_SetSwapInterval(1))
  69       {
  70         log_info << "no support for vsync: " << SDL_GetError() << std::endl;
  71       }
  72     }
  73   }
  74
  75   SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
  76
  77   SDL_GL_SetAttribute(SDL_GL_RED_SIZE,   5);
  78   SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 5);
  79   SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE,  5);
  80
  81   if(g_config->use_fullscreen)
  82   {
  83     apply_video_mode(g_config->fullscreen_size, true);
  84   }
  85   else
  86   {
  87     apply_video_mode(g_config->window_size, false);
  88   }
  89
  90   // setup opengl state and transform
  91   glDisable(GL_DEPTH_TEST);
  92   glDisable(GL_CULL_FACE);
  93   glEnable(GL_TEXTURE_2D);
  94   glEnable(GL_BLEND);
  95   glEnableClientState(GL_VERTEX_ARRAY);
  96   glEnableClientState(GL_TEXTURE_COORD_ARRAY);
  97   glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
  98
  99   // Init the projection matrix, viewport and stuff
 100   apply_config();
 101
 102   if(texture_manager == 0)
 103     texture_manager = new TextureManager();
 104   else
 105     texture_manager->reload_textures();
 106
 107 #ifndef GL_VERSION_ES_CM_1_0
 108   GLenum err = glewInit();
 109   if (GLEW_OK != err)
 110   {
 111     std::ostringstream out;
 112     out << "GLRenderer: " << glewGetErrorString(err);
 113     throw std::runtime_error(out.str());
 114   }
 115   log_info << "Using GLEW " << glewGetString(GLEW_VERSION) << std::endl;
 116   log_info << "GLEW_ARB_texture_non_power_of_two: " << static_cast<int>(GLEW_ARB_texture_non_power_of_two) << std::endl;
 117 #endif
 118 }
 119
 120 GLRenderer::~GLRenderer()
 121 {
 122   SDL_GL_DeleteContext(glcontext);
 123   SDL_DestroyWindow(window);
 124 }
 125
 126 void
 127 GLRenderer::draw_surface(const DrawingRequest& request)
 128 {
 129   const Surface* surface = (const Surface*) request.request_data;
 130   if(surface == NULL)
 131   {
 132     return;
 133   }
 134   GLTexture* gltexture = static_cast<GLTexture*>(surface->get_texture().get());
 135   if(gltexture == NULL)
 136   {
 137     return;
 138   }
 139   GLSurfaceData *surface_data = static_cast<GLSurfaceData*>(surface->get_surface_data());
 140   if(surface_data == NULL)
 141   {
 142     return;
 143   }
 144
 145   GLuint th = gltexture->get_handle();
 146   if (th != last_texture) {
 147     last_texture = th;
 148     glBindTexture(GL_TEXTURE_2D, th);
 149   }
 150   intern_draw(request.pos.x, request.pos.y,
 151               request.pos.x + surface->get_width(),
 152               request.pos.y + surface->get_height(),
 153               surface_data->get_uv_left(),
 154               surface_data->get_uv_top(),
 155               surface_data->get_uv_right(),
 156               surface_data->get_uv_bottom(),
 157               request.angle,
 158               request.alpha,
 159               request.color,
 160               request.blend,
 161               request.drawing_effect);
 162 }
 163
 164 void
 165 GLRenderer::draw_surface_part(const DrawingRequest& request)
 166 {
 167   const SurfacePartRequest* surfacepartrequest
 168     = (SurfacePartRequest*) request.request_data;
 169   const Surface* surface = surfacepartrequest->surface;
 170   boost::shared_ptr<GLTexture> gltexture = boost::dynamic_pointer_cast<GLTexture>(surface->get_texture());
 171   GLSurfaceData *surface_data = reinterpret_cast<GLSurfaceData *>(surface->get_surface_data());
 172
 173   float uv_width = surface_data->get_uv_right() - surface_data->get_uv_left();
 174   float uv_height = surface_data->get_uv_bottom() - surface_data->get_uv_top();
 175
 176   float uv_left = surface_data->get_uv_left() + (uv_width * surfacepartrequest->source.x) / surface->get_width();
 177   float uv_top = surface_data->get_uv_top() + (uv_height * surfacepartrequest->source.y) / surface->get_height();
 178   float uv_right = surface_data->get_uv_left() + (uv_width * (surfacepartrequest->source.x + surfacepartrequest->size.x)) / surface->get_width();
 179   float uv_bottom = surface_data->get_uv_top() + (uv_height * (surfacepartrequest->source.y + surfacepartrequest->size.y)) / surface->get_height();
 180
 181   GLuint th = gltexture->get_handle();
 182   if (th != last_texture) {
 183     last_texture = th;
 184     glBindTexture(GL_TEXTURE_2D, th);
 185   }
 186   intern_draw(request.pos.x, request.pos.y,
 187               request.pos.x + surfacepartrequest->size.x,
 188               request.pos.y + surfacepartrequest->size.y,
 189               uv_left,
 190               uv_top,
 191               uv_right,
 192               uv_bottom,
 193               0.0,
 194               request.alpha,
 195               request.color,
 196               Blend(),
 197               request.drawing_effect);
 198 }
 199
 200 void
 201 GLRenderer::draw_gradient(const DrawingRequest& request)
 202 {
 203   const GradientRequest* gradientrequest
 204     = (GradientRequest*) request.request_data;
 205   const Color& top = gradientrequest->top;
 206   const Color& bottom = gradientrequest->bottom;
 207
 208   glDisable(GL_TEXTURE_2D);
 209   glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 210   glEnableClientState(GL_COLOR_ARRAY);
 211
 212   float vertices[] = {
 213     0, 0,
 214     float(SCREEN_WIDTH), 0,
 215     float(SCREEN_WIDTH), float(SCREEN_HEIGHT),
 216     0, float(SCREEN_HEIGHT)
 217   };
 218   glVertexPointer(2, GL_FLOAT, 0, vertices);
 219
 220   float colors[] = {
 221     top.red, top.green, top.blue, top.alpha,
 222     top.red, top.green, top.blue, top.alpha,
 223     bottom.red, bottom.green, bottom.blue, bottom.alpha,
 224     bottom.red, bottom.green, bottom.blue, bottom.alpha,
 225   };
 226   glColorPointer(4, GL_FLOAT, 0, colors);
 227
 228   glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
 229
 230   glDisableClientState(GL_COLOR_ARRAY);
 231   glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 232
 233   glEnable(GL_TEXTURE_2D);
 234   glColor4f(1, 1, 1, 1);
 235 }
 236
 237 void
 238 GLRenderer::draw_filled_rect(const DrawingRequest& request)
 239 {
 240   const FillRectRequest* fillrectrequest
 241     = (FillRectRequest*) request.request_data;
 242
 243   glDisable(GL_TEXTURE_2D);
 244   glColor4f(fillrectrequest->color.red, fillrectrequest->color.green,
 245             fillrectrequest->color.blue, fillrectrequest->color.alpha);
 246   glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 247
 248   if (fillrectrequest->radius != 0.0f)
 249   {
 250     // draw round rect
 251     // Keep radius in the limits, so that we get a circle instead of
 252     // just graphic junk
 253     float radius = std::min(fillrectrequest->radius,
 254                             std::min(fillrectrequest->size.x/2,
 255                                      fillrectrequest->size.y/2));
 256
 257     // inner rectangle
 258     Rectf irect(request.pos.x    + radius,
 259                request.pos.y    + radius,
 260                request.pos.x + fillrectrequest->size.x - radius,
 261                request.pos.y + fillrectrequest->size.y - radius);
 262
 263     int n = 8;
 264     int p = 0;
 265     std::vector<float> vertices((n+1) * 4 * 2);
 266
 267     for(int i = 0; i <= n; ++i)
 268     {
 269       float x = sinf(i * (M_PI/2) / n) * radius;
 270       float y = cosf(i * (M_PI/2) / n) * radius;
 271
 272       vertices[p++] = irect.get_left() - x;
 273       vertices[p++] = irect.get_top()  - y;
 274
 275       vertices[p++] = irect.get_right() + x;
 276       vertices[p++] = irect.get_top()   - y;
 277     }
 278
 279     for(int i = 0; i <= n; ++i)
 280     {
 281       float x = cosf(i * (M_PI/2) / n) * radius;
 282       float y = sinf(i * (M_PI/2) / n) * radius;
 283
 284       vertices[p++] = irect.get_left()   - x;
 285       vertices[p++] = irect.get_bottom() + y;
 286
 287       vertices[p++] = irect.get_right()  + x;
 288       vertices[p++] = irect.get_bottom() + y;
 289     }
 290
 291     glVertexPointer(2, GL_FLOAT, 0, &*vertices.begin());
 292     glDrawArrays(GL_TRIANGLE_STRIP, 0,  vertices.size()/2);
 293   }
 294   else
 295   {
 296     float x = request.pos.x;
 297     float y = request.pos.y;
 298     float w = fillrectrequest->size.x;
 299     float h = fillrectrequest->size.y;
 300
 301     float vertices[] = {
 302       x,   y,
 303       x+w, y,
 304       x+w, y+h,
 305       x,   y+h
 306     };
 307     glVertexPointer(2, GL_FLOAT, 0, vertices);
 308
 309     glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
 310   }
 311
 312   glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 313   glEnable(GL_TEXTURE_2D);
 314   glColor4f(1, 1, 1, 1);
 315 }
 316
 317 void
 318 GLRenderer::draw_inverse_ellipse(const DrawingRequest& request)
 319 {
 320   const InverseEllipseRequest* ellipse = (InverseEllipseRequest*)request.request_data;
 321
 322   glDisable(GL_TEXTURE_2D);
 323   glColor4f(ellipse->color.red,  ellipse->color.green,
 324             ellipse->color.blue, ellipse->color.alpha);
 325
 326   float x = request.pos.x;
 327   float y = request.pos.y;
 328   float w = ellipse->size.x/2.0f;
 329   float h = ellipse->size.y/2.0f;
 330
 331   static const int slices = 16;
 332   static const int points = (slices+1) * 12;
 333
 334   float vertices[points * 2];
 335   int   p = 0;
 336
 337   // Bottom
 338   vertices[p++] = SCREEN_WIDTH; vertices[p++] = SCREEN_HEIGHT;
 339   vertices[p++] = 0;            vertices[p++] = SCREEN_HEIGHT;
 340   vertices[p++] = x;            vertices[p++] = y+h;
 341
 342   // Top
 343   vertices[p++] = SCREEN_WIDTH; vertices[p++] = 0;
 344   vertices[p++] = 0;            vertices[p++] = 0;
 345   vertices[p++] = x;            vertices[p++] = y-h;
 346
 347   // Left
 348   vertices[p++] = SCREEN_WIDTH; vertices[p++] = 0;
 349   vertices[p++] = SCREEN_WIDTH; vertices[p++] = SCREEN_HEIGHT;
 350   vertices[p++] = x+w;          vertices[p++] = y;
 351
 352   // Right
 353   vertices[p++] = 0;            vertices[p++] = 0;
 354   vertices[p++] = 0;            vertices[p++] = SCREEN_HEIGHT;
 355   vertices[p++] = x-w;          vertices[p++] = y;
 356
 357   for(int i = 0; i < slices; ++i)
 358   {
 359     float ex1 = sinf(M_PI/2 / slices * i) * w;
 360     float ey1 = cosf(M_PI/2 / slices * i) * h;
 361
 362     float ex2 = sinf(M_PI/2 / slices * (i+1)) * w;
 363     float ey2 = cosf(M_PI/2 / slices * (i+1)) * h;
 364
 365     // Bottom/Right
 366     vertices[p++] = SCREEN_WIDTH; vertices[p++] = SCREEN_HEIGHT;
 367     vertices[p++] = x + ex1;      vertices[p++] = y + ey1;
 368     vertices[p++] = x + ex2;      vertices[p++] = y + ey2;
 369
 370     // Top/Left
 371     vertices[p++] = 0;            vertices[p++] = 0;
 372     vertices[p++] = x - ex1;      vertices[p++] = y - ey1;
 373     vertices[p++] = x - ex2;      vertices[p++] = y - ey2;
 374
 375     // Top/Right
 376     vertices[p++] = SCREEN_WIDTH; vertices[p++] = 0;
 377     vertices[p++] = x + ex1;      vertices[p++] = y - ey1;
 378     vertices[p++] = x + ex2;      vertices[p++] = y - ey2;
 379
 380     // Bottom/Left
 381     vertices[p++] = 0;            vertices[p++] = SCREEN_HEIGHT;
 382     vertices[p++] = x - ex1;      vertices[p++] = y + ey1;
 383     vertices[p++] = x - ex2;      vertices[p++] = y + ey2;
 384   }
 385
 386   glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 387   glVertexPointer(2, GL_FLOAT, 0, vertices);
 388
 389   glDrawArrays(GL_TRIANGLES, 0, points);
 390
 391   glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 392
 393   glEnable(GL_TEXTURE_2D);
 394   glColor4f(1, 1, 1, 1);
 395 }
 396
 397 void
 398 GLRenderer::do_take_screenshot()
 399 {
 400   // [Christoph] TODO: Yes, this method also takes care of the actual disk I/O. Split it?
 401
 402   SDL_Surface *shot_surf;
 403   // create surface to hold screenshot
 404 #if SDL_BYTEORDER == SDL_BIG_ENDIAN
 405   shot_surf = SDL_CreateRGBSurface(SDL_SWSURFACE, SCREEN_WIDTH, SCREEN_HEIGHT, 24, 0x00FF0000, 0x0000FF00, 0x000000FF, 0);
 406 #else
 407   shot_surf = SDL_CreateRGBSurface(SDL_SWSURFACE, SCREEN_WIDTH, SCREEN_HEIGHT, 24, 0x000000FF, 0x0000FF00, 0x00FF0000, 0);
 408 #endif
 409   if (!shot_surf) {
 410     log_warning << "Could not create RGB Surface to contain screenshot" << std::endl;
 411     return;
 412   }
 413
 414   // read pixels into array
 415   char* pixels = new char[3 * SCREEN_WIDTH * SCREEN_HEIGHT];
 416   if (!pixels) {
 417     log_warning << "Could not allocate memory to store screenshot" << std::endl;
 418     SDL_FreeSurface(shot_surf);
 419     return;
 420   }
 421   glPixelStorei(GL_PACK_ALIGNMENT, 1);
 422   glReadPixels(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT, GL_RGB, GL_UNSIGNED_BYTE, pixels);
 423
 424   // copy array line-by-line
 425   for (int i = 0; i < SCREEN_HEIGHT; i++) {
 426     char* src = pixels + (3 * SCREEN_WIDTH * (SCREEN_HEIGHT - i - 1));
 427     if(SDL_MUSTLOCK(shot_surf))
 428     {
 429       SDL_LockSurface(shot_surf);
 430     }
 431     char* dst = ((char*)shot_surf->pixels) + i * shot_surf->pitch;
 432     memcpy(dst, src, 3 * SCREEN_WIDTH);
 433     if(SDL_MUSTLOCK(shot_surf))
 434     {
 435       SDL_UnlockSurface(shot_surf);
 436     }
 437   }
 438
 439   // free array
 440   delete[](pixels);
 441
 442   // save screenshot
 443   static const std::string writeDir = PHYSFS_getWriteDir();
 444   static const std::string dirSep = PHYSFS_getDirSeparator();
 445   static const std::string baseName = "screenshot";
 446   static const std::string fileExt = ".bmp";
 447   std::string fullFilename;
 448   for (int num = 0; num < 1000; num++) {
 449     std::ostringstream oss;
 450     oss << baseName;
 451     oss << std::setw(3) << std::setfill('0') << num;
 452     oss << fileExt;
 453     std::string fileName = oss.str();
 454     fullFilename = writeDir + dirSep + fileName;
 455     if (!PHYSFS_exists(fileName.c_str())) {
 456       SDL_SaveBMP(shot_surf, fullFilename.c_str());
 457       log_debug << "Wrote screenshot to \"" << fullFilename << "\"" << std::endl;
 458       SDL_FreeSurface(shot_surf);
 459       return;
 460     }
 461   }
 462   log_warning << "Did not save screenshot, because all files up to \"" << fullFilename << "\" already existed" << std::endl;
 463   SDL_FreeSurface(shot_surf);
 464 }
 465
 466 void
 467 GLRenderer::flip()
 468 {
 469   assert_gl("drawing");
 470   SDL_GL_SwapWindow(window);
 471 }
 472
 473 void
 474 GLRenderer::resize(int w, int h)
 475 {
 476   g_config->window_size = Size(w, h);
 477
 478   PHYSICAL_SCREEN_WIDTH = w;
 479   PHYSICAL_SCREEN_HEIGHT = h;
 480
 481   apply_config();
 482 }
 483
 484 void
 485 GLRenderer::apply_config()
 486 {
 487   if (false)
 488   {
 489     log_info << "Applying Config:"
 490              << "\n  Desktop: " << desktop_size.width << "x" << desktop_size.height
 491              << "\n  Window:  " << g_config->window_size
 492              << "\n  FullRes: " << g_config->fullscreen_size
 493              << "\n  Aspect:  " << g_config->aspect_size
 494              << "\n  Magnif:  " << g_config->magnification
 495              << std::endl;
 496   }
 497
 498   float target_aspect = static_cast<float>(desktop_size.width) / static_cast<float>(desktop_size.height);
 499   if (g_config->aspect_size != Size(0, 0))
 500   {
 501     target_aspect = float(g_config->aspect_size.width) / float(g_config->aspect_size.height);
 502   }
 503
 504   float desktop_aspect = 4.0f / 3.0f; // random default fallback guess
 505   if (desktop_size.width != -1 && desktop_size.height != -1)
 506   {
 507     desktop_aspect = float(desktop_size.width) / float(desktop_size.height);
 508   }
 509
 510   Size screen_size;
 511
 512   // Get the screen width
 513   if (g_config->use_fullscreen)
 514   {
 515     screen_size = g_config->fullscreen_size;
 516     desktop_aspect = float(screen_size.width) / float(screen_size.height);
 517   }
 518   else
 519   {
 520     screen_size = g_config->window_size;
 521   }
 522
 523   apply_video_mode(screen_size, g_config->use_fullscreen);
 524
 525   if (target_aspect > 1.0f)
 526   {
 527     SCREEN_WIDTH  = static_cast<int>(screen_size.width * (target_aspect / desktop_aspect));
 528     SCREEN_HEIGHT = static_cast<int>(screen_size.height);
 529   }
 530   else
 531   {
 532     SCREEN_WIDTH  = static_cast<int>(screen_size.width);
 533     SCREEN_HEIGHT = static_cast<int>(screen_size.height  * (target_aspect / desktop_aspect));
 534   }
 535
 536   Size max_size(1280, 800);
 537   Size min_size(640, 480);
 538
 539   if (g_config->magnification == 0.0f) // Magic value that means 'minfill'
 540   {
 541     // This scales SCREEN_WIDTH/SCREEN_HEIGHT so that they never excede
 542     // max_size.width/max_size.height resp. min_size.width/min_size.height
 543     if (SCREEN_WIDTH > max_size.width || SCREEN_HEIGHT > max_size.height)
 544     {
 545       float scale1  = float(max_size.width)/SCREEN_WIDTH;
 546       float scale2  = float(max_size.height)/SCREEN_HEIGHT;
 547       float scale   = (scale1 < scale2) ? scale1 : scale2;
 548       SCREEN_WIDTH  = static_cast<int>(SCREEN_WIDTH  * scale);
 549       SCREEN_HEIGHT = static_cast<int>(SCREEN_HEIGHT * scale);
 550     }
 551     else if (SCREEN_WIDTH < min_size.width || SCREEN_HEIGHT < min_size.height)
 552     {
 553       float scale1  = float(min_size.width)/SCREEN_WIDTH;
 554       float scale2  = float(min_size.height)/SCREEN_HEIGHT;
 555       float scale   = (scale1 < scale2) ? scale1 : scale2;
 556       SCREEN_WIDTH  = static_cast<int>(SCREEN_WIDTH  * scale);
 557       SCREEN_HEIGHT = static_cast<int>(SCREEN_HEIGHT * scale);
 558     }
 559
 560
 561     glViewport(0, 0, screen_size.width, screen_size.height);
 562   }
 563   else
 564   {
 565     SCREEN_WIDTH  = static_cast<int>(SCREEN_WIDTH  / g_config->magnification);
 566     SCREEN_HEIGHT = static_cast<int>(SCREEN_HEIGHT / g_config->magnification);
 567
 568     // This works by adding black borders around the screen to limit
 569     // SCREEN_WIDTH/SCREEN_HEIGHT to max_size.width/max_size.height
 570     Size new_size = screen_size;
 571
 572     if (SCREEN_WIDTH > max_size.width)
 573     {
 574       new_size.width = static_cast<int>((float) new_size.width * float(max_size.width)/SCREEN_WIDTH);
 575       SCREEN_WIDTH = static_cast<int>(max_size.width);
 576     }
 577
 578     if (SCREEN_HEIGHT > max_size.height)
 579     {
 580       new_size.height = static_cast<int>((float) new_size.height * float(max_size.height)/SCREEN_HEIGHT);
 581       SCREEN_HEIGHT = static_cast<int>(max_size.height);
 582     }
 583
 584     // Clear both buffers so that we get a clean black border without junk
 585     glClear(GL_COLOR_BUFFER_BIT);
 586     SDL_GL_SwapWindow(window);
 587     glClear(GL_COLOR_BUFFER_BIT);
 588     SDL_GL_SwapWindow(window);
 589
 590     glViewport(std::max(0, (screen_size.width  - new_size.width)  / 2),
 591                std::max(0, (screen_size.height - new_size.height) / 2),
 592                std::min(new_size.width,  screen_size.width),
 593                std::min(new_size.height, screen_size.height));
 594   }
 595
 596   glMatrixMode(GL_PROJECTION);
 597   glLoadIdentity();
 598
 599   glOrtho(0, SCREEN_WIDTH, SCREEN_HEIGHT, 0, -1, 1);
 600
 601   glMatrixMode(GL_MODELVIEW);
 602   glLoadIdentity();
 603   glTranslatef(0, 0, 0);
 604   check_gl_error("Setting up view matrices");
 605 }
 606
 607 void
 608 GLRenderer::apply_video_mode(const Size& size, bool fullscreen)
 609 {
 610   if (window)
 611   {
 612     SDL_SetWindowSize(window, size.width, size.height);
 613
 614     if (fullscreen)
 615     {
 616       int fullscreen_flags = SDL_WINDOW_FULLSCREEN; // SDL_WINDOW_FULLSCREEN_DESKTOP or 0
 617       SDL_SetWindowDisplayMode(window, NULL);
 618
 619       SDL_DisplayMode mode;
 620       mode.format = SDL_PIXELFORMAT_RGB888;
 621       mode.w = g_config->fullscreen_size.width;
 622       mode.h = g_config->fullscreen_size.height;
 623       mode.refresh_rate = g_config->fullscreen_refresh_rate;
 624       mode.driverdata = 0;
 625
 626       if (SDL_SetWindowDisplayMode(window, &mode) != 0)
 627       {
 628         log_warning << "failed to set display mode: "
 629                     << mode.w << "x" << mode.h << "@" << mode.refresh_rate << ": "
 630                     << SDL_GetError() << std::endl;
 631       }
 632       else
 633       {
 634         SDL_SetWindowFullscreen(window, fullscreen_flags);
 635       }
 636     }
 637     else
 638     {
 639       SDL_SetWindowFullscreen(window, 0);
 640     }
 641   }
 642   else
 643   {
 644     // Only change video mode when its different from the current one
 645     if (screen_size != size || fullscreen_active != fullscreen)
 646     {
 647       int flags = SDL_WINDOW_OPENGL;
 648
 649       if (fullscreen)
 650       {
 651         flags |= SDL_WINDOW_FULLSCREEN;
 652       }
 653       else
 654       {
 655         flags |= SDL_WINDOW_RESIZABLE;
 656       }
 657
 658       window = SDL_CreateWindow("SuperTux",
 659                                 SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
 660                                 size.width, size.height,
 661                                 flags);
 662       if (!window)
 663       {
 664         std::ostringstream msg;
 665         msg << "Couldn't set video mode " << size.width << "x" << size.height << ": " << SDL_GetError();
 666         throw std::runtime_error(msg.str());
 667       }
 668       else
 669       {
 670         glcontext = SDL_GL_CreateContext(window);
 671         screen_size = size;
 672
 673         PHYSICAL_SCREEN_WIDTH = size.width;
 674         PHYSICAL_SCREEN_HEIGHT = size.height;
 675
 676         SCREEN_WIDTH = size.width;
 677         SCREEN_HEIGHT = size.height;
 678
 679         fullscreen_active = fullscreen;
 680       }
 681     }
 682   }
 683 }
 684
 685 void
 686 GLRenderer::set_gamma(float gamma)
 687 {
 688   Uint16 ramp[256];
 689   SDL_CalculateGammaRamp(gamma, ramp);
 690   SDL_SetWindowGammaRamp(window, ramp, ramp, ramp);
 691 }
 692
 693 /* EOF */