src/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     if(effect & VERTICAL_FLIP) {
  61       std::swap(uv_top, uv_bottom);
  62     }
  63
  64     float center_x = (left + right) / 2;
  65     float center_y = (top + bottom) / 2;
  66
  67     float sa = sinf(angle/180.0f*M_PI);
  68     float ca = cosf(angle/180.0f*M_PI);
  69
  70     left  -= center_x;
  71     right -= center_x;
  72
  73     top    -= center_y;
  74     bottom -= center_y;
  75
  76     glBlendFunc(blend.sfactor, blend.dfactor);
  77     glColor4f(color.red, color.green, color.blue, color.alpha * alpha);
  78     glBegin(GL_QUADS);
  79     glTexCoord2f(uv_left, uv_top);
  80     glVertex2f(left*ca - top*sa + center_x,
  81                left*sa + top*ca + center_y);
  82
  83     glTexCoord2f(uv_right, uv_top);
  84     glVertex2f(right*ca - top*sa + center_x,
  85                right*sa + top*ca + center_y);
  86
  87     glTexCoord2f(uv_right, uv_bottom);
  88     glVertex2f(right*ca - bottom*sa + center_x,
  89                right*sa + bottom*ca + center_y);
  90
  91     glTexCoord2f(uv_left, uv_bottom);
  92     glVertex2f(left*ca - bottom*sa + center_x,
  93                left*sa + bottom*ca + center_y);
  94     glEnd();
  95
  96     // FIXME: find a better way to restore the blend mode
  97     glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
  98     glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
  99   }
 100 }
 101
 102 namespace GL
 103 {
 104   Renderer::Renderer()
 105   {
 106     if(texture_manager != 0)
 107       texture_manager->save_textures();
 108
 109     if(config->try_vsync) {
 110       /* we want vsync for smooth scrolling */
 111     SDL_GL_SetAttribute(SDL_GL_SWAP_CONTROL, 1);
 112     }
 113
 114     SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
 115     SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 5);
 116     SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 5);
 117     SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, 5);
 118
 119     int flags = SDL_OPENGL;
 120     if(config->use_fullscreen)
 121       flags |= SDL_FULLSCREEN;
 122     int width = config->screenwidth;
 123     int height = config->screenheight;
 124     int bpp = 0;
 125
 126     SDL_Surface *screen = SDL_SetVideoMode(width, height, bpp, flags);
 127     if(screen == 0) {
 128       std::stringstream msg;
 129       msg << "Couldn't set video mode (" << width << "x" << height
 130           << "-" << bpp << "bpp): " << SDL_GetError();
 131       throw std::runtime_error(msg.str());
 132     }
 133
 134     // setup opengl state and transform
 135     glDisable(GL_DEPTH_TEST);
 136     glDisable(GL_CULL_FACE);
 137     glEnable(GL_TEXTURE_2D);
 138     glEnable(GL_BLEND);
 139     glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 140
 141     glViewport(0, 0, screen->w, screen->h);
 142     glMatrixMode(GL_PROJECTION);
 143     glLoadIdentity();
 144     // logical resolution here not real monitor resolution
 145     glOrtho(0, SCREEN_WIDTH, SCREEN_HEIGHT, 0, -1.0, 1.0);
 146     glMatrixMode(GL_MODELVIEW);
 147     glLoadIdentity();
 148     glTranslatef(0, 0, 0);
 149
 150     check_gl_error("Setting up view matrices");
 151
 152
 153     if(texture_manager == 0)
 154       texture_manager = new TextureManager();
 155     else
 156       texture_manager->reload_textures();
 157   }
 158
 159   Renderer::~Renderer()
 160   {
 161   }
 162
 163   void
 164   Renderer::draw_surface(const DrawingRequest& request)
 165   {
 166     const Surface* surface = (const Surface*) request.request_data;
 167     GL::Texture *gltexture = dynamic_cast<GL::Texture *>(surface->get_texture());
 168     GL::SurfaceData *surface_data = reinterpret_cast<GL::SurfaceData *>(surface->get_surface_data());
 169
 170     glBindTexture(GL_TEXTURE_2D, gltexture->get_handle());
 171     intern_draw(request.pos.x, request.pos.y,
 172                 request.pos.x + surface->get_width(),
 173                 request.pos.y + surface->get_height(),
 174                 surface_data->get_uv_left(),
 175                 surface_data->get_uv_top(),
 176                 surface_data->get_uv_right(),
 177                 surface_data->get_uv_bottom(),
 178                 request.angle,
 179                 request.alpha,
 180                 request.color,
 181                 request.blend,
 182                 request.drawing_effect);
 183   }
 184
 185   void
 186   Renderer::draw_surface_part(const DrawingRequest& request)
 187   {
 188     const SurfacePartRequest* surfacepartrequest
 189       = (SurfacePartRequest*) request.request_data;
 190     const Surface *surface = surfacepartrequest->surface;
 191     GL::Texture *gltexture = dynamic_cast<GL::Texture *>(surface->get_texture());
 192     GL::SurfaceData *surface_data = reinterpret_cast<GL::SurfaceData *>(surface->get_surface_data());
 193
 194     float uv_width = surface_data->get_uv_right() - surface_data->get_uv_left();
 195     float uv_height = surface_data->get_uv_bottom() - surface_data->get_uv_top();
 196
 197     float uv_left = surface_data->get_uv_left() + (uv_width * surfacepartrequest->source.x) / surface->get_width();
 198     float uv_top = surface_data->get_uv_top() + (uv_height * surfacepartrequest->source.y) / surface->get_height();
 199     float uv_right = surface_data->get_uv_left() + (uv_width * (surfacepartrequest->source.x + surfacepartrequest->size.x)) / surface->get_width();
 200     float uv_bottom = surface_data->get_uv_top() + (uv_height * (surfacepartrequest->source.y + surfacepartrequest->size.y)) / surface->get_height();
 201
 202     glBindTexture(GL_TEXTURE_2D, gltexture->get_handle());
 203     intern_draw(request.pos.x, request.pos.y,
 204                 request.pos.x + surfacepartrequest->size.x,
 205                 request.pos.y + surfacepartrequest->size.y,
 206                 uv_left,
 207                 uv_top,
 208                 uv_right,
 209                 uv_bottom,
 210                 0.0,
 211                 request.alpha,
 212                 Color(1.0, 1.0, 1.0),
 213                 Blend(),
 214                 request.drawing_effect);
 215   }
 216
 217   void
 218   Renderer::draw_gradient(const DrawingRequest& request)
 219   {
 220     const GradientRequest* gradientrequest
 221       = (GradientRequest*) request.request_data;
 222     const Color& top = gradientrequest->top;
 223     const Color& bottom = gradientrequest->bottom;
 224
 225     glDisable(GL_TEXTURE_2D);
 226     glBegin(GL_QUADS);
 227     glColor4f(top.red, top.green, top.blue, top.alpha);
 228     glVertex2f(0, 0);
 229     glVertex2f(SCREEN_WIDTH, 0);
 230     glColor4f(bottom.red, bottom.green, bottom.blue, bottom.alpha);
 231     glVertex2f(SCREEN_WIDTH, SCREEN_HEIGHT);
 232     glVertex2f(0, SCREEN_HEIGHT);
 233     glEnd();
 234     glEnable(GL_TEXTURE_2D);
 235     glColor4f(1, 1, 1, 1);
 236   }
 237
 238   void
 239   Renderer::draw_filled_rect(const DrawingRequest& request)
 240   {
 241     const FillRectRequest* fillrectrequest
 242       = (FillRectRequest*) request.request_data;
 243
 244     float x = request.pos.x;
 245     float y = request.pos.y;
 246     float w = fillrectrequest->size.x;
 247     float h = fillrectrequest->size.y;
 248
 249     glDisable(GL_TEXTURE_2D);
 250     glColor4f(fillrectrequest->color.red, fillrectrequest->color.green,
 251               fillrectrequest->color.blue, fillrectrequest->color.alpha);
 252
 253     glBegin(GL_QUADS);
 254     glVertex2f(x, y);
 255     glVertex2f(x+w, y);
 256     glVertex2f(x+w, y+h);
 257     glVertex2f(x, y+h);
 258     glEnd();
 259     glEnable(GL_TEXTURE_2D);
 260     glColor4f(1, 1, 1, 1);
 261   }
 262
 263   void
 264   Renderer::do_take_screenshot()
 265   {
 266     // [Christoph] TODO: Yes, this method also takes care of the actual disk I/O. Split it?
 267
 268     SDL_Surface *shot_surf;
 269     // create surface to hold screenshot
 270     #if SDL_BYTEORDER == SDL_BIG_ENDIAN
 271     shot_surf = SDL_CreateRGBSurface(SDL_SWSURFACE, SCREEN_WIDTH, SCREEN_HEIGHT, 24, 0x00FF0000, 0x0000FF00, 0x000000FF, 0);
 272     #else
 273     shot_surf = SDL_CreateRGBSurface(SDL_SWSURFACE, SCREEN_WIDTH, SCREEN_HEIGHT, 24, 0x000000FF, 0x0000FF00, 0x00FF0000, 0);
 274     #endif
 275     if (!shot_surf) {
 276       log_warning << "Could not create RGB Surface to contain screenshot" << std::endl;
 277       return;
 278     }
 279
 280     // read pixels into array
 281     char* pixels = new char[3 * SCREEN_WIDTH * SCREEN_HEIGHT];
 282     if (!pixels) {
 283       log_warning << "Could not allocate memory to store screenshot" << std::endl;
 284       SDL_FreeSurface(shot_surf);
 285       return;
 286     }
 287     glReadPixels(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT, GL_RGB, GL_UNSIGNED_BYTE, pixels);
 288
 289     // copy array line-by-line
 290     for (int i = 0; i < SCREEN_HEIGHT; i++) {
 291       char* src = pixels + (3 * SCREEN_WIDTH * (SCREEN_HEIGHT - i - 1));
 292       if(SDL_MUSTLOCK(shot_surf))
 293       {
 294         SDL_LockSurface(shot_surf);
 295       }
 296       char* dst = ((char*)shot_surf->pixels) + i * shot_surf->pitch;
 297       memcpy(dst, src, 3 * SCREEN_WIDTH);
 298       if(SDL_MUSTLOCK(shot_surf))
 299       {
 300         SDL_UnlockSurface(shot_surf);
 301       }
 302     }
 303
 304     // free array
 305     delete[](pixels);
 306
 307     // save screenshot
 308     static const std::string writeDir = PHYSFS_getWriteDir();
 309     static const std::string dirSep = PHYSFS_getDirSeparator();
 310     static const std::string baseName = "screenshot";
 311     static const std::string fileExt = ".bmp";
 312     std::string fullFilename;
 313     for (int num = 0; num < 1000; num++) {
 314       std::ostringstream oss;
 315       oss << baseName;
 316       oss << std::setw(3) << std::setfill('0') << num;
 317       oss << fileExt;
 318       std::string fileName = oss.str();
 319       fullFilename = writeDir + dirSep + fileName;
 320       if (!PHYSFS_exists(fileName.c_str())) {
 321         SDL_SaveBMP(shot_surf, fullFilename.c_str());
 322         log_debug << "Wrote screenshot to \"" << fullFilename << "\"" << std::endl;
 323         SDL_FreeSurface(shot_surf);
 324         return;
 325       }
 326     }
 327     log_warning << "Did not save screenshot, because all files up to \"" << fullFilename << "\" already existed" << std::endl;
 328     SDL_FreeSurface(shot_surf);
 329   }
 330
 331   void
 332   Renderer::flip()
 333   {
 334     assert_gl("drawing");
 335     SDL_GL_SwapBuffers();
 336   }
 337 }
 338
 339 #endif