src/video/drawing_context.cpp

   1 //  $Id: drawing_context.cpp 2334 2005-04-04 16:26:14Z grumbel $
   2 //
   3 //  SuperTux -  A Jump'n Run
   4 //  Copyright (C) 2004 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 #include <algorithm>
  22 #include <cassert>
  23 #include <iostream>
  24
  25 #include "drawing_context.h"
  26 #include "surface.h"
  27 #include "font.h"
  28 #include "main.h"
  29 #include "gameconfig.h"
  30
  31 DrawingContext::DrawingContext(SDL_Surface* targetsurface)
  32 {
  33   if(targetsurface) {
  34     screen = targetsurface;
  35   } else {
  36     screen = SDL_GetVideoSurface();
  37   }
  38 }
  39
  40 DrawingContext::~DrawingContext()
  41 {
  42 }
  43
  44 void
  45 DrawingContext::draw_surface(const Surface* surface, const Vector& position,
  46     int layer)
  47 {
  48   assert(surface != 0);
  49
  50   DrawingRequest request;
  51
  52   request.type = SURFACE;
  53   request.pos = transform.apply(position);
  54
  55   if(request.pos.x >= SCREEN_WIDTH || request.pos.y >= SCREEN_HEIGHT
  56       || request.pos.x + surface->w < 0 || request.pos.y + surface->h < 0)
  57     return;
  58
  59   request.layer = layer;
  60   request.drawing_effect = transform.drawing_effect;
  61   request.zoom = transform.zoom;
  62   request.alpha = transform.alpha;
  63   request.request_data = const_cast<Surface*> (surface);
  64
  65   drawingrequests.push_back(request);
  66 }
  67
  68 void
  69 DrawingContext::draw_surface_part(const Surface* surface, const Vector& source,
  70     const Vector& size, const Vector& dest, int layer)
  71 {
  72   assert(surface != 0);
  73
  74   DrawingRequest request;
  75
  76   request.type = SURFACE_PART;
  77   request.pos = transform.apply(dest);
  78   request.layer = layer;
  79   request.drawing_effect = transform.drawing_effect;
  80   request.alpha = transform.alpha;
  81
  82   SurfacePartRequest* surfacepartrequest = new SurfacePartRequest();
  83   surfacepartrequest->size = size;
  84   surfacepartrequest->source = source;
  85   surfacepartrequest->surface = surface;
  86
  87   // clip on screen borders
  88   if(request.pos.x < 0) {
  89     surfacepartrequest->size.x += request.pos.x;
  90     if(surfacepartrequest->size.x <= 0)
  91       return;
  92     surfacepartrequest->source.x -= request.pos.x;
  93     request.pos.x = 0;
  94   }
  95   if(request.pos.y < 0) {
  96     surfacepartrequest->size.y += request.pos.y;
  97     if(surfacepartrequest->size.y <= 0)
  98       return;
  99     surfacepartrequest->source.y -= request.pos.y;
 100     request.pos.y = 0;
 101   }
 102   request.request_data = surfacepartrequest;
 103
 104   drawingrequests.push_back(request);
 105 }
 106
 107 void
 108 DrawingContext::draw_text(const Font* font, const std::string& text,
 109     const Vector& position, FontAlignment alignment, int layer)
 110 {
 111   DrawingRequest request;
 112
 113   request.type = TEXT;
 114   request.pos = transform.apply(position);
 115   request.layer = layer;
 116   request.drawing_effect = transform.drawing_effect;
 117   request.zoom = transform.zoom;
 118   request.alpha = transform.alpha;
 119
 120   TextRequest* textrequest = new TextRequest;
 121   textrequest->font = font;
 122   textrequest->text = text;
 123   textrequest->alignment = alignment;
 124   request.request_data = textrequest;
 125
 126   drawingrequests.push_back(request);
 127 }
 128
 129 void
 130 DrawingContext::draw_center_text(const Font* font, const std::string& text,
 131     const Vector& position, int layer)
 132 {
 133   draw_text(font, text, Vector(position.x + SCREEN_WIDTH/2, position.y),
 134       CENTER_ALLIGN, layer);
 135 }
 136
 137 void
 138 DrawingContext::draw_gradient(Color top, Color bottom, int layer)
 139 {
 140   DrawingRequest request;
 141
 142   request.type = GRADIENT;
 143   request.pos = Vector(0,0);
 144   request.layer = layer;
 145
 146   request.drawing_effect = transform.drawing_effect;
 147   request.zoom = transform.zoom;
 148   request.alpha = transform.alpha;
 149
 150   GradientRequest* gradientrequest = new GradientRequest;
 151   gradientrequest->top = top;
 152   gradientrequest->bottom = bottom;
 153   request.request_data = gradientrequest;
 154
 155   drawingrequests.push_back(request);
 156 }
 157
 158 void
 159 DrawingContext::draw_filled_rect(const Vector& topleft, const Vector& size,
 160         Color color, int layer)
 161 {
 162   DrawingRequest request;
 163
 164   request.type = FILLRECT;
 165   request.pos = transform.apply(topleft);
 166   request.layer = layer;
 167
 168   request.drawing_effect = transform.drawing_effect;
 169   request.zoom = transform.zoom;
 170   request.alpha = transform.alpha;
 171
 172   FillRectRequest* fillrectrequest = new FillRectRequest;
 173   fillrectrequest->size = size;
 174   fillrectrequest->color = color;
 175   fillrectrequest->color.alpha
 176       = (int) ((float) fillrectrequest->color.alpha
 177               * ((float) transform.alpha / 255.0));
 178   request.request_data = fillrectrequest;
 179
 180   drawingrequests.push_back(request);
 181 }
 182
 183 void
 184 DrawingContext::draw_surface_part(DrawingRequest& request)
 185 {
 186   SurfacePartRequest* surfacepartrequest
 187     = (SurfacePartRequest*) request.request_data;
 188
 189   surfacepartrequest->surface->impl->draw_part(
 190       surfacepartrequest->source.x, surfacepartrequest->source.y,
 191       request.pos.x, request.pos.y,
 192       surfacepartrequest->size.x, surfacepartrequest->size.y, request.alpha,
 193       request.drawing_effect);
 194
 195   delete surfacepartrequest;
 196 }
 197
 198 void
 199 DrawingContext::draw_gradient(DrawingRequest& request)
 200 {
 201   GradientRequest* gradientrequest = (GradientRequest*) request.request_data;
 202   const Color& top = gradientrequest->top;
 203   const Color& bottom = gradientrequest->bottom;
 204
 205 #ifndef NOOPENGL
 206   if(config->use_gl)
 207     {
 208       glBegin(GL_QUADS);
 209       glColor3ub(top.red, top.green, top.blue);
 210       glVertex2f(0, 0);
 211       glVertex2f(SCREEN_WIDTH, 0);
 212       glColor3ub(bottom.red, bottom.green, bottom.blue);
 213       glVertex2f(SCREEN_WIDTH, SCREEN_HEIGHT);
 214       glVertex2f(0, SCREEN_HEIGHT);
 215       glEnd();
 216     }
 217   else
 218   {
 219 #endif
 220     if(&top == &bottom)
 221       {
 222       fillrect(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT, top.red, top.green, top.blue);
 223       }
 224     else
 225       {
 226       float redstep = (float(bottom.red)-float(top.red)) / float(SCREEN_HEIGHT);
 227       float greenstep = (float(bottom.green)-float(top.green)) / float(SCREEN_HEIGHT);
 228       float bluestep = (float(bottom.blue) - float(top.blue)) / float(SCREEN_HEIGHT);
 229
 230       for(float y = 0; y < SCREEN_HEIGHT; y += 2)
 231         fillrect(0, (int)y, SCREEN_WIDTH, 2,
 232             int(float(top.red) + redstep * y),
 233             int(float(top.green) + greenstep * y),
 234             int(float(top.blue) + bluestep * y), 255);
 235       }
 236 #ifndef NOOPENGL
 237
 238     }
 239 #endif
 240
 241   delete gradientrequest;
 242 }
 243
 244 void
 245 DrawingContext::draw_text(DrawingRequest& request)
 246 {
 247   TextRequest* textrequest = (TextRequest*) request.request_data;
 248
 249   textrequest->font->draw(textrequest->text, request.pos,
 250       textrequest->alignment, request.drawing_effect, request.alpha);
 251
 252   delete textrequest;
 253 }
 254
 255 void
 256 DrawingContext::draw_filled_rect(DrawingRequest& request)
 257 {
 258   FillRectRequest* fillrectrequest = (FillRectRequest*) request.request_data;
 259
 260   float x = request.pos.x;
 261   float y = request.pos.y;
 262   float w = fillrectrequest->size.x;
 263   float h = fillrectrequest->size.y;
 264
 265 #ifndef NOOPENGL
 266   if(config->use_gl)
 267     {
 268       glEnable(GL_BLEND);
 269       glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 270       glColor4ub(fillrectrequest->color.red, fillrectrequest->color.green,
 271           fillrectrequest->color.blue, fillrectrequest->color.alpha);
 272
 273       glBegin(GL_POLYGON);
 274       glVertex2f(x, y);
 275       glVertex2f(x+w, y);
 276       glVertex2f(x+w, y+h);
 277       glVertex2f(x, y+h);
 278       glEnd();
 279       glDisable(GL_BLEND);
 280     }
 281   else
 282     {
 283 #endif
 284       SDL_Rect src, rect;
 285       SDL_Surface *temp = NULL;
 286
 287       rect.x = (int)x;
 288       rect.y = (int)y;
 289       rect.w = (int)w;
 290       rect.h = (int)h;
 291
 292       if(fillrectrequest->color.alpha != 255)
 293         {
 294           temp = SDL_CreateRGBSurface(screen->flags, rect.w, rect.h, screen->format->BitsPerPixel,
 295                                       screen->format->Rmask,
 296                                       screen->format->Gmask,
 297                                       screen->format->Bmask,
 298                                       screen->format->Amask);
 299
 300
 301           src.x = 0;
 302           src.y = 0;
 303           src.w = rect.w;
 304           src.h = rect.h;
 305
 306           SDL_FillRect(temp, &src, SDL_MapRGB(screen->format,
 307                 fillrectrequest->color.red, fillrectrequest->color.green,
 308                 fillrectrequest->color.blue));
 309
 310           SDL_SetAlpha(temp, SDL_SRCALPHA, fillrectrequest->color.alpha);
 311
 312           SDL_BlitSurface(temp,0,screen,&rect);
 313
 314           SDL_FreeSurface(temp);
 315         }
 316       else
 317         SDL_FillRect(screen, &rect, SDL_MapRGB(screen->format,
 318               fillrectrequest->color.red, fillrectrequest->color.green,
 319               fillrectrequest->color.blue));
 320
 321 #ifndef NOOPENGL
 322
 323     }
 324 #endif
 325
 326   delete fillrectrequest;
 327 }
 328
 329 void
 330 DrawingContext::do_drawing()
 331 {
 332 #ifdef DEBUG
 333   assert(transformstack.empty());
 334 #endif
 335   transformstack.clear();
 336
 337   std::stable_sort(drawingrequests.begin(), drawingrequests.end());
 338
 339   for(DrawingRequests::iterator i = drawingrequests.begin();
 340       i != drawingrequests.end(); ++i) {
 341     switch(i->type) {
 342       case SURFACE:
 343       {
 344         const Surface* surface = (const Surface*) i->request_data;
 345
 346         if(i->zoom != 1.0)
 347           surface->impl->draw_stretched(i->pos.x * i->zoom, i->pos.y * i->zoom,
 348                          (int)(surface->w * i->zoom), (int)(surface->h * i->zoom),
 349                          i->alpha, i->drawing_effect);
 350         else
 351           surface->impl->draw(i->pos.x, i->pos.y, i->alpha, i->drawing_effect);
 352         break;
 353       }
 354       case SURFACE_PART:
 355         draw_surface_part(*i);
 356         break;
 357       case GRADIENT:
 358         draw_gradient(*i);
 359         break;
 360       case TEXT:
 361         draw_text(*i);
 362         break;
 363       case FILLRECT:
 364         draw_filled_rect(*i);
 365         break;
 366     }
 367   }
 368
 369   // update screen
 370   if(config->use_gl)
 371     SDL_GL_SwapBuffers();
 372   else
 373     SDL_Flip(screen);
 374
 375   drawingrequests.clear();
 376 }
 377
 378 void
 379 DrawingContext::push_transform()
 380 {
 381   transformstack.push_back(transform);
 382 }
 383
 384 void
 385 DrawingContext::pop_transform()
 386 {
 387   assert(!transformstack.empty());
 388
 389   transform = transformstack.back();
 390   transformstack.pop_back();
 391 }
 392
 393 void
 394 DrawingContext::set_drawing_effect(uint32_t effect)
 395 {
 396   transform.drawing_effect = effect;
 397 }
 398
 399 uint32_t
 400 DrawingContext::get_drawing_effect() const
 401 {
 402   return transform.drawing_effect;
 403 }
 404
 405 void
 406 DrawingContext::set_zooming(float zoom)
 407 {
 408   transform.zoom = zoom;
 409 }
 410
 411 void
 412 DrawingContext::set_alpha(uint8_t alpha)
 413 {
 414   transform.alpha = alpha;
 415 }
 416
 417 uint8_t
 418 DrawingContext::get_alpha() const
 419 {
 420   return transform.alpha;
 421 }