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