src/video/gl_renderer.cpp

   1 //  $Id: gl_renderer.cpp 5063 2007-05-27 11:32:00Z matzeb $
   2 //
   3 //  SuperTux
   4 //  Copyright (C) 2006 Matthias Braun <matze@braunis.de>
   5 //
   6 //  This program is free software; you can redistribute it and/or
   7 //  modify it under the terms of the GNU General Public License
   8 //  as published by the Free Software Foundation; either version 2
   9 //  of the License, or (at your option) any later version.
  10 //
  11 //  This program is distributed in the hope that it will be useful,
  12 //  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 //  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 //  GNU General Public License for more details.
  15 //
  16 //  You should have received a copy of the GNU General Public License
  17 //  along with this program; if not, write to the Free Software
  18 //  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  19 #include <config.h>
  20
  21 #ifdef HAVE_OPENGL
  22
  23 #include <functional>
  24 #include <algorithm>
  25 #include <cassert>
  26 #include <math.h>
  27 #include <iostream>
  28 #include <SDL_image.h>
  29 #include <sstream>
  30 #include <iomanip>
  31 #include <physfs.h>
  32
  33 #include "glutil.hpp"
  34 #include "gl_renderer.hpp"
  35 #include "gl_texture.hpp"
  36 #include "gl_surface_data.hpp"
  37 #include "drawing_context.hpp"
  38 #include "drawing_request.hpp"
  39 #include "surface.hpp"
  40 #include "font.hpp"
  41 #include "main.hpp"
  42 #include "gameconfig.hpp"
  43 #include "texture.hpp"
  44 #include "texture_manager.hpp"
  45 #include "obstack/obstackpp.hpp"
  46 #define LIGHTMAP_DIV 5
  47
  48 namespace
  49 {
  50 inline void intern_draw(float left, float top, float right, float bottom,
  51                         float uv_left, float uv_top,
  52                         float uv_right, float uv_bottom,
  53                         float angle, float alpha,
  54                         const Color& color,
  55                         const Blend& blend,
  56                         DrawingEffect effect)
  57 {
  58   if(effect & HORIZONTAL_FLIP)
  59     std::swap(uv_left, uv_right);
  60
  61   if(effect & VERTICAL_FLIP)
  62     std::swap(uv_top, uv_bottom);
  63
  64   if (angle == 0.0f)
  65     { // unrotated blit
  66       glBlendFunc(blend.sfactor, blend.dfactor);
  67       glColor4f(color.red, color.green, color.blue, color.alpha * alpha);
  68       glBegin(GL_QUADS);
  69       glTexCoord2f(uv_left, uv_top);
  70       glVertex2f(left, top);
  71
  72       glTexCoord2f(uv_right, uv_top);
  73       glVertex2f(right, top);
  74
  75       glTexCoord2f(uv_right, uv_bottom);
  76       glVertex2f(right, bottom);
  77
  78       glTexCoord2f(uv_left, uv_bottom);
  79       glVertex2f(left, bottom);
  80       glEnd();
  81     }
  82   else
  83     { // rotated blit
  84       float center_x = (left + right) / 2;
  85       float center_y = (top + bottom) / 2;
  86
  87       float sa = sinf(angle/180.0f*M_PI);
  88       float ca = cosf(angle/180.0f*M_PI);
  89
  90       left  -= center_x;
  91       right -= center_x;
  92
  93       top    -= center_y;
  94       bottom -= center_y;
  95
  96       glBlendFunc(blend.sfactor, blend.dfactor);
  97       glColor4f(color.red, color.green, color.blue, color.alpha * alpha);
  98       glBegin(GL_QUADS);
  99       glTexCoord2f(uv_left, uv_top);
 100       glVertex2f(left*ca - top*sa + center_x,
 101                  left*sa + top*ca + center_y);
 102
 103       glTexCoord2f(uv_right, uv_top);
 104       glVertex2f(right*ca - top*sa + center_x,
 105                  right*sa + top*ca + center_y);
 106
 107       glTexCoord2f(uv_right, uv_bottom);
 108       glVertex2f(right*ca - bottom*sa + center_x,
 109                  right*sa + bottom*ca + center_y);
 110
 111       glTexCoord2f(uv_left, uv_bottom);
 112       glVertex2f(left*ca - bottom*sa + center_x,
 113                  left*sa + bottom*ca + center_y);
 114       glEnd();
 115     }
 116
 117   // FIXME: find a better way to restore the blend mode
 118   glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
 119   glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 120 }
 121 }
 122
 123 namespace GL
 124 {
 125   Renderer::Renderer()
 126   {
 127     ::Renderer::instance_ = this;
 128
 129     if(texture_manager != 0)
 130       texture_manager->save_textures();
 131
 132     if(config->try_vsync) {
 133       /* we want vsync for smooth scrolling */
 134     SDL_GL_SetAttribute(SDL_GL_SWAP_CONTROL, 1);
 135     }
 136
 137     SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
 138
 139     // Hu? 16bit rendering?
 140     SDL_GL_SetAttribute(SDL_GL_RED_SIZE,   5);
 141     SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 5);
 142     SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE,  5);
 143
 144     int flags = SDL_OPENGL;
 145     int width;
 146     int height;
 147     if(config->use_fullscreen)
 148       {
 149         flags |= SDL_FULLSCREEN;
 150         width  = config->fullscreen_width;
 151         height = config->fullscreen_height;
 152       }
 153     else
 154       {
 155         flags |= SDL_RESIZABLE;
 156         width  = config->window_width;
 157         height = config->window_height;
 158       }
 159     int bpp = 0;
 160
 161     SDL_Surface *screen = SDL_SetVideoMode(width, height, bpp, flags);
 162     if(screen == 0) {
 163       std::stringstream msg;
 164       msg << "Couldn't set video mode (" << width << "x" << height
 165           << "-" << bpp << "bpp): " << SDL_GetError();
 166       throw std::runtime_error(msg.str());
 167     }
 168
 169     // setup opengl state and transform
 170     glDisable(GL_DEPTH_TEST);
 171     glDisable(GL_CULL_FACE);
 172     glEnable(GL_TEXTURE_2D);
 173     glEnable(GL_BLEND);
 174     glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 175
 176     glViewport(0, 0, screen->w, screen->h);
 177     glMatrixMode(GL_PROJECTION);
 178     glLoadIdentity();
 179
 180     // logical resolution here not real monitor resolution
 181     glOrtho(0, SCREEN_WIDTH, SCREEN_HEIGHT, 0, -1.0, 1.0);
 182
 183     glMatrixMode(GL_MODELVIEW);
 184     glLoadIdentity();
 185     glTranslatef(0, 0, 0);
 186
 187     check_gl_error("Setting up view matrices");
 188
 189
 190     if(texture_manager == 0)
 191       texture_manager = new TextureManager();
 192     else
 193       texture_manager->reload_textures();
 194   }
 195
 196   Renderer::~Renderer()
 197   {
 198   }
 199
 200   void
 201   Renderer::draw_surface(const DrawingRequest& request)
 202   {
 203     const Surface* surface = (const Surface*) request.request_data;
 204     GL::Texture *gltexture = dynamic_cast<GL::Texture *>(surface->get_texture());
 205     GL::SurfaceData *surface_data = reinterpret_cast<GL::SurfaceData *>(surface->get_surface_data());
 206
 207     glBindTexture(GL_TEXTURE_2D, gltexture->get_handle());
 208     intern_draw(request.pos.x, request.pos.y,
 209                 request.pos.x + surface->get_width(),
 210                 request.pos.y + surface->get_height(),
 211                 surface_data->get_uv_left(),
 212                 surface_data->get_uv_top(),
 213                 surface_data->get_uv_right(),
 214                 surface_data->get_uv_bottom(),
 215                 request.angle,
 216                 request.alpha,
 217                 request.color,
 218                 request.blend,
 219                 request.drawing_effect);
 220   }
 221
 222   void
 223   Renderer::draw_surface_part(const DrawingRequest& request)
 224   {
 225     const SurfacePartRequest* surfacepartrequest
 226       = (SurfacePartRequest*) request.request_data;
 227     const Surface *surface = surfacepartrequest->surface;
 228     GL::Texture *gltexture = dynamic_cast<GL::Texture *>(surface->get_texture());
 229     GL::SurfaceData *surface_data = reinterpret_cast<GL::SurfaceData *>(surface->get_surface_data());
 230
 231     float uv_width = surface_data->get_uv_right() - surface_data->get_uv_left();
 232     float uv_height = surface_data->get_uv_bottom() - surface_data->get_uv_top();
 233
 234     float uv_left = surface_data->get_uv_left() + (uv_width * surfacepartrequest->source.x) / surface->get_width();
 235     float uv_top = surface_data->get_uv_top() + (uv_height * surfacepartrequest->source.y) / surface->get_height();
 236     float uv_right = surface_data->get_uv_left() + (uv_width * (surfacepartrequest->source.x + surfacepartrequest->size.x)) / surface->get_width();
 237     float uv_bottom = surface_data->get_uv_top() + (uv_height * (surfacepartrequest->source.y + surfacepartrequest->size.y)) / surface->get_height();
 238
 239     glBindTexture(GL_TEXTURE_2D, gltexture->get_handle());
 240     intern_draw(request.pos.x, request.pos.y,
 241                 request.pos.x + surfacepartrequest->size.x,
 242                 request.pos.y + surfacepartrequest->size.y,
 243                 uv_left,
 244                 uv_top,
 245                 uv_right,
 246                 uv_bottom,
 247                 0.0,
 248                 request.alpha,
 249                 Color(1.0, 1.0, 1.0),
 250                 Blend(),
 251                 request.drawing_effect);
 252   }
 253
 254   void
 255   Renderer::draw_gradient(const DrawingRequest& request)
 256   {
 257     const GradientRequest* gradientrequest
 258       = (GradientRequest*) request.request_data;
 259     const Color& top = gradientrequest->top;
 260     const Color& bottom = gradientrequest->bottom;
 261
 262     glDisable(GL_TEXTURE_2D);
 263     glBegin(GL_QUADS);
 264     glColor4f(top.red, top.green, top.blue, top.alpha);
 265     glVertex2f(0, 0);
 266     glVertex2f(SCREEN_WIDTH, 0);
 267     glColor4f(bottom.red, bottom.green, bottom.blue, bottom.alpha);
 268     glVertex2f(SCREEN_WIDTH, SCREEN_HEIGHT);
 269     glVertex2f(0, SCREEN_HEIGHT);
 270     glEnd();
 271     glEnable(GL_TEXTURE_2D);
 272     glColor4f(1, 1, 1, 1);
 273   }
 274
 275   void
 276   Renderer::draw_filled_rect(const DrawingRequest& request)
 277   {
 278     const FillRectRequest* fillrectrequest
 279       = (FillRectRequest*) request.request_data;
 280
 281     if (fillrectrequest->radius != 0.0f)
 282       {
 283         // draw round rect
 284         // Keep radius in the limits, so that we get a circle instead of
 285         // just graphic junk
 286         float radius = std::min(fillrectrequest->radius,
 287                                 std::min(fillrectrequest->size.x/2,
 288                                          fillrectrequest->size.y/2));
 289
 290         // inner rectangle
 291         Rect irect(request.pos.x    + radius,
 292                    request.pos.y    + radius,
 293                    request.pos.x + fillrectrequest->size.x - radius,
 294                    request.pos.y + fillrectrequest->size.y - radius);
 295
 296         glDisable(GL_TEXTURE_2D);
 297         glColor4f(fillrectrequest->color.red, fillrectrequest->color.green,
 298                   fillrectrequest->color.blue, fillrectrequest->color.alpha);
 299
 300
 301         int n = 8;
 302         glBegin(GL_QUAD_STRIP);
 303         for(int i = 0; i <= n; ++i)
 304           {
 305             float x = sinf(i * (M_PI/2) / n) * radius;
 306             float y = cosf(i * (M_PI/2) / n) * radius;
 307
 308             glVertex2f(irect.get_left()  - x, irect.get_top() - y);
 309             glVertex2f(irect.get_right() + x, irect.get_top() - y);
 310           }
 311         for(int i = 0; i <= n; ++i)
 312           {
 313             float x = cosf(i * (M_PI/2) / n) * radius;
 314             float y = sinf(i * (M_PI/2) / n) * radius;
 315
 316             glVertex2f(irect.get_left()  - x, irect.get_bottom() + y);
 317             glVertex2f(irect.get_right() + x, irect.get_bottom() + y);
 318           }
 319         glEnd();
 320         glEnable(GL_TEXTURE_2D);
 321         glColor4f(1, 1, 1, 1);
 322       }
 323     else
 324       {
 325         float x = request.pos.x;
 326         float y = request.pos.y;
 327         float w = fillrectrequest->size.x;
 328         float h = fillrectrequest->size.y;
 329
 330         glDisable(GL_TEXTURE_2D);
 331         glColor4f(fillrectrequest->color.red, fillrectrequest->color.green,
 332                   fillrectrequest->color.blue, fillrectrequest->color.alpha);
 333
 334         glBegin(GL_QUADS);
 335         glVertex2f(x, y);
 336         glVertex2f(x+w, y);
 337         glVertex2f(x+w, y+h);
 338         glVertex2f(x, y+h);
 339         glEnd();
 340         glEnable(GL_TEXTURE_2D);
 341         glColor4f(1, 1, 1, 1);
 342       }
 343   }
 344
 345   void
 346   Renderer::draw_inverse_ellipse(const DrawingRequest& request)
 347   {
 348     const InverseEllipseRequest* ellipse = (InverseEllipseRequest*)request.request_data;
 349
 350     glDisable(GL_TEXTURE_2D);
 351     glColor4f(ellipse->color.red,  ellipse->color.green,
 352               ellipse->color.blue, ellipse->color.alpha);
 353
 354     float x = request.pos.x;
 355     float y = request.pos.y;
 356     float w = ellipse->size.x/2.0f;
 357     float h = ellipse->size.y/2.0f;
 358
 359     glBegin(GL_TRIANGLES);
 360
 361     // Bottom
 362     glVertex2f(SCREEN_WIDTH, SCREEN_HEIGHT);
 363     glVertex2f(0, SCREEN_HEIGHT);
 364     glVertex2f(x, y+h);
 365
 366     // Top
 367     glVertex2f(SCREEN_WIDTH, 0);
 368     glVertex2f(0, 0);
 369     glVertex2f(x, y-h);
 370
 371     // Left
 372     glVertex2f(SCREEN_WIDTH, 0);
 373     glVertex2f(SCREEN_WIDTH, SCREEN_HEIGHT);
 374     glVertex2f(x+w, y);
 375
 376     // Right
 377     glVertex2f(0, 0);
 378     glVertex2f(0, SCREEN_HEIGHT);
 379     glVertex2f(x-w, y);
 380
 381     glEnd();
 382
 383     int slices = 16;
 384     for(int i = 0; i < slices; ++i)
 385       {
 386         float ex1 = sinf(M_PI/2 / slices * i) * w;
 387         float ey1 = cosf(M_PI/2 / slices * i) * h;
 388
 389         float ex2 = sinf(M_PI/2 / slices * (i+1)) * w;
 390         float ey2 = cosf(M_PI/2 / slices * (i+1)) * h;
 391
 392         glBegin(GL_TRIANGLES);
 393
 394         // Bottom/Right
 395         glVertex2f(SCREEN_WIDTH, SCREEN_HEIGHT);
 396         glVertex2f(x + ex1, y + ey1);
 397         glVertex2f(x + ex2, y + ey2);
 398
 399         // Top/Left
 400         glVertex2f(0, 0);
 401         glVertex2f(x - ex1, y - ey1);
 402         glVertex2f(x - ex2, y - ey2);
 403
 404         // Top/Right
 405         glVertex2f(SCREEN_WIDTH, 0);
 406         glVertex2f(x + ex1, y - ey1);
 407         glVertex2f(x + ex2, y - ey2);
 408
 409         // Bottom/Left
 410         glVertex2f(0, SCREEN_HEIGHT);
 411         glVertex2f(x - ex1, y + ey1);
 412         glVertex2f(x - ex2, y + ey2);
 413
 414         glEnd();
 415       }
 416     glEnable(GL_TEXTURE_2D);
 417     glColor4f(1, 1, 1, 1);
 418   }
 419
 420   void
 421   Renderer::do_take_screenshot()
 422   {
 423     // [Christoph] TODO: Yes, this method also takes care of the actual disk I/O. Split it?
 424
 425     SDL_Surface *shot_surf;
 426     // create surface to hold screenshot
 427     #if SDL_BYTEORDER == SDL_BIG_ENDIAN
 428     shot_surf = SDL_CreateRGBSurface(SDL_SWSURFACE, SCREEN_WIDTH, SCREEN_HEIGHT, 24, 0x00FF0000, 0x0000FF00, 0x000000FF, 0);
 429     #else
 430     shot_surf = SDL_CreateRGBSurface(SDL_SWSURFACE, SCREEN_WIDTH, SCREEN_HEIGHT, 24, 0x000000FF, 0x0000FF00, 0x00FF0000, 0);
 431     #endif
 432     if (!shot_surf) {
 433       log_warning << "Could not create RGB Surface to contain screenshot" << std::endl;
 434       return;
 435     }
 436
 437     // read pixels into array
 438     char* pixels = new char[3 * SCREEN_WIDTH * SCREEN_HEIGHT];
 439     if (!pixels) {
 440       log_warning << "Could not allocate memory to store screenshot" << std::endl;
 441       SDL_FreeSurface(shot_surf);
 442       return;
 443     }
 444     glReadPixels(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT, GL_RGB, GL_UNSIGNED_BYTE, pixels);
 445
 446     // copy array line-by-line
 447     for (int i = 0; i < SCREEN_HEIGHT; i++) {
 448       char* src = pixels + (3 * SCREEN_WIDTH * (SCREEN_HEIGHT - i - 1));
 449       if(SDL_MUSTLOCK(shot_surf))
 450       {
 451         SDL_LockSurface(shot_surf);
 452       }
 453       char* dst = ((char*)shot_surf->pixels) + i * shot_surf->pitch;
 454       memcpy(dst, src, 3 * SCREEN_WIDTH);
 455       if(SDL_MUSTLOCK(shot_surf))
 456       {
 457         SDL_UnlockSurface(shot_surf);
 458       }
 459     }
 460
 461     // free array
 462     delete[](pixels);
 463
 464     // save screenshot
 465     static const std::string writeDir = PHYSFS_getWriteDir();
 466     static const std::string dirSep = PHYSFS_getDirSeparator();
 467     static const std::string baseName = "screenshot";
 468     static const std::string fileExt = ".bmp";
 469     std::string fullFilename;
 470     for (int num = 0; num < 1000; num++) {
 471       std::ostringstream oss;
 472       oss << baseName;
 473       oss << std::setw(3) << std::setfill('0') << num;
 474       oss << fileExt;
 475       std::string fileName = oss.str();
 476       fullFilename = writeDir + dirSep + fileName;
 477       if (!PHYSFS_exists(fileName.c_str())) {
 478         SDL_SaveBMP(shot_surf, fullFilename.c_str());
 479         log_debug << "Wrote screenshot to \"" << fullFilename << "\"" << std::endl;
 480         SDL_FreeSurface(shot_surf);
 481         return;
 482       }
 483     }
 484     log_warning << "Did not save screenshot, because all files up to \"" << fullFilename << "\" already existed" << std::endl;
 485     SDL_FreeSurface(shot_surf);
 486   }
 487
 488   void
 489   Renderer::flip()
 490   {
 491     assert_gl("drawing");
 492     SDL_GL_SwapBuffers();
 493   }
 494
 495   void
 496   Renderer::resize(int w, int h)
 497   {
 498     SDL_SetVideoMode(w, h, 0, SDL_OPENGL | SDL_RESIZABLE);
 499
 500     config->window_width  = w;
 501     config->window_height = h;
 502
 503     // FIXME: Add aspect handling
 504     SCREEN_WIDTH  = w;
 505     SCREEN_HEIGHT = h;
 506
 507     glViewport(0, 0, config->window_width, config->window_height);
 508     glMatrixMode(GL_PROJECTION);
 509     glLoadIdentity();
 510     glOrtho(0, SCREEN_WIDTH, SCREEN_HEIGHT, 0, -1.0, 1.0);
 511   }
 512 }
 513
 514 #endif