lib/video/drawing_context.cpp

   1 //  $Id$
   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 <algorithm>
  20 #include <cassert>
  21 #include <iostream>
  22
  23 #include "../video/drawing_context.h"
  24 #include "../video/surface.h"
  25 #include "../app/globals.h"
  26 #include "../video/font.h"
  27
  28 using namespace SuperTux;
  29
  30 DrawingContext::DrawingContext()
  31 {
  32 transform.draw_effect = NONE_EFFECT;
  33 transform.zoom = 1;
  34 transform.alpha = 255;
  35 }
  36
  37 DrawingContext::~DrawingContext()
  38 {
  39 }
  40
  41 void
  42 DrawingContext::draw_surface(const Surface* surface, const Vector& position,
  43     int layer, Uint32 drawing_effect)
  44 {
  45   assert(surface != 0);
  46
  47   DrawingRequest request;
  48
  49   request.type = SURFACE;
  50   request.layer = layer;
  51   request.request_data = const_cast<Surface*> (surface);
  52   request.pos = transform.apply(position);
  53   request.drawing_effect = drawing_effect;
  54   request.drawing_effect = transform.draw_effect | drawing_effect;
  55   request.zoom = transform.zoom;
  56   request.alpha = transform.alpha;
  57
  58   drawingrequests.push_back(request);
  59 }
  60
  61 void
  62 DrawingContext::draw_surface_part(const Surface* surface, const Vector& source,
  63     const Vector& size, const Vector& dest, int layer, Uint32 drawing_effect)
  64 {
  65   assert(surface != 0);
  66
  67   DrawingRequest request;
  68
  69   request.type = SURFACE_PART;
  70   request.layer = layer;
  71   request.pos = transform.apply(dest);
  72   request.drawing_effect = drawing_effect;
  73   request.alpha = transform.alpha;
  74
  75   SurfacePartRequest* surfacepartrequest = new SurfacePartRequest();
  76   surfacepartrequest->size = size;
  77   surfacepartrequest->source = source;
  78   surfacepartrequest->surface = surface;
  79   request.request_data = surfacepartrequest;
  80
  81   drawingrequests.push_back(request);
  82 }
  83
  84 void
  85 DrawingContext::draw_text(Font* font, const std::string& text,
  86     const Vector& position, int allignment, int layer,
  87     Uint32 drawing_effect)
  88 {
  89   DrawingRequest request;
  90
  91   request.type = TEXT;
  92   request.layer = layer;
  93   request.pos = transform.apply(position);
  94   request.drawing_effect = drawing_effect;
  95   request.alpha = transform.alpha;
  96
  97   TextRequest* textrequest = new TextRequest;
  98   textrequest->font = font;
  99   textrequest->text = text;
 100   textrequest->allignment = allignment;
 101   request.request_data = textrequest;
 102
 103   drawingrequests.push_back(request);
 104 }
 105
 106 void
 107 DrawingContext::draw_gradient(Color top, Color bottom, int layer)
 108 {
 109   DrawingRequest request;
 110
 111   request.type = GRADIENT;
 112   request.layer = layer;
 113   request.pos = Vector(0,0);
 114
 115   GradientRequest* gradientrequest = new GradientRequest;
 116   gradientrequest->top = top;
 117   gradientrequest->bottom = bottom;
 118   request.request_data = gradientrequest;
 119
 120   drawingrequests.push_back(request);
 121 }
 122
 123 void
 124 DrawingContext::draw_filled_rect(const Vector& topleft, const Vector& size,
 125         Color color, int layer)
 126 {
 127   DrawingRequest request;
 128
 129   request.type = FILLRECT;
 130   request.layer = layer;
 131   request.pos = transform.apply(topleft);
 132
 133   FillRectRequest* fillrectrequest = new FillRectRequest;
 134   fillrectrequest->size = size;
 135   fillrectrequest->color = color;
 136   request.request_data = fillrectrequest;
 137
 138   drawingrequests.push_back(request);
 139 }
 140
 141 void
 142 DrawingContext::draw_surface_part(DrawingRequest& request)
 143 {
 144   SurfacePartRequest* surfacepartrequest
 145     = (SurfacePartRequest*) request.request_data;
 146
 147   surfacepartrequest->surface->impl->draw_part(
 148       surfacepartrequest->source.x, surfacepartrequest->source.y,
 149       request.pos.x, request.pos.y,
 150       surfacepartrequest->size.x, surfacepartrequest->size.y, request.alpha,
 151       request.drawing_effect);
 152
 153   delete surfacepartrequest;
 154 }
 155
 156 void
 157 DrawingContext::draw_gradient(DrawingRequest& request)
 158 {
 159   GradientRequest* gradientrequest = (GradientRequest*) request.request_data;
 160   const Color& top = gradientrequest->top;
 161   const Color& bottom = gradientrequest->bottom;
 162
 163 #ifndef NOOPENGL
 164   if(use_gl)
 165     {
 166       glBegin(GL_QUADS);
 167       glColor3ub(top.red, top.green, top.blue);
 168       glVertex2f(0, 0);
 169       glVertex2f(screen->w, 0);
 170       glColor3ub(bottom.red, bottom.green, bottom.blue);
 171       glVertex2f(screen->w, screen->h);
 172       glVertex2f(0, screen->h);
 173       glEnd();
 174     }
 175   else
 176   {
 177 #endif
 178     if(&top == &bottom)
 179       {
 180       fillrect(0, 0, screen->w, screen->h, top.red, top.green, top.blue);
 181       }
 182     else
 183       {
 184       float redstep = (float(bottom.red)-float(top.red)) / float(screen->h);
 185       float greenstep = (float(bottom.green)-float(top.green)) / float(screen->h);
 186       float bluestep = (float(bottom.blue) - float(top.blue)) / float(screen->h);
 187
 188       for(float y = 0; y < screen->h; y += 2)
 189         fillrect(0, (int)y, screen->w, 2,
 190             int(float(top.red) + redstep * y),
 191             int(float(top.green) + greenstep * y),
 192             int(float(top.blue) + bluestep * y), 255);
 193       }
 194 #ifndef NOOPENGL
 195
 196     }
 197 #endif
 198
 199   delete gradientrequest;
 200 }
 201
 202 void
 203 DrawingContext::draw_text(DrawingRequest& request)
 204 {
 205   TextRequest* textrequest = (TextRequest*) request.request_data;
 206
 207   textrequest->font->draw(textrequest->text, request.pos, textrequest->allignment, request.drawing_effect, request.alpha);
 208
 209   delete textrequest;
 210 }
 211
 212 void
 213 DrawingContext::draw_filled_rect(DrawingRequest& request)
 214 {
 215   FillRectRequest* fillrectrequest = (FillRectRequest*) request.request_data;
 216
 217   float x = request.pos.x;
 218   float y = request.pos.y;
 219   float w = fillrectrequest->size.x;
 220   float h = fillrectrequest->size.y;
 221
 222 #ifndef NOOPENGL
 223   if(use_gl)
 224     {
 225       glEnable(GL_BLEND);
 226       glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 227       glColor4ub(fillrectrequest->color.red, fillrectrequest->color.green,
 228           fillrectrequest->color.blue, fillrectrequest->color.alpha);
 229
 230       glBegin(GL_POLYGON);
 231       glVertex2f(x, y);
 232       glVertex2f(x+w, y);
 233       glVertex2f(x+w, y+h);
 234       glVertex2f(x, y+h);
 235       glEnd();
 236       glDisable(GL_BLEND);
 237     }
 238   else
 239     {
 240 #endif
 241       SDL_Rect src, rect;
 242       SDL_Surface *temp = NULL;
 243
 244       rect.x = (int)x;
 245       rect.y = (int)y;
 246       rect.w = (int)w;
 247       rect.h = (int)h;
 248
 249       if(fillrectrequest->color.alpha != 255)
 250         {
 251           temp = SDL_CreateRGBSurface(screen->flags, rect.w, rect.h, screen->format->BitsPerPixel,
 252                                       screen->format->Rmask,
 253                                       screen->format->Gmask,
 254                                       screen->format->Bmask,
 255                                       screen->format->Amask);
 256
 257
 258           src.x = 0;
 259           src.y = 0;
 260           src.w = rect.w;
 261           src.h = rect.h;
 262
 263           SDL_FillRect(temp, &src, SDL_MapRGB(screen->format,
 264                 fillrectrequest->color.red, fillrectrequest->color.green,
 265                 fillrectrequest->color.blue));
 266
 267           SDL_SetAlpha(temp, SDL_SRCALPHA, fillrectrequest->color.alpha);
 268
 269           SDL_BlitSurface(temp,0,screen,&rect);
 270
 271           SDL_FreeSurface(temp);
 272         }
 273       else
 274         SDL_FillRect(screen, &rect, SDL_MapRGB(screen->format,
 275               fillrectrequest->color.red, fillrectrequest->color.green,
 276               fillrectrequest->color.blue));
 277
 278 #ifndef NOOPENGL
 279
 280     }
 281 #endif
 282
 283   delete fillrectrequest;
 284 }
 285
 286 void
 287 DrawingContext::do_drawing()
 288 {
 289   std::stable_sort(drawingrequests.begin(), drawingrequests.end());
 290
 291   for(DrawingRequests::iterator i = drawingrequests.begin();
 292       i != drawingrequests.end(); ++i) {
 293     switch(i->type) {
 294       case SURFACE:
 295       {
 296         const Surface* surface = (const Surface*) i->request_data;
 297
 298         if(i->zoom != 1.0)
 299           surface->impl->draw_stretched(i->pos.x * i->zoom, i->pos.y * i->zoom,
 300                          (int)(surface->w * i->zoom), (int)(surface->h * i->zoom),
 301                          i->alpha, i->drawing_effect);
 302         else
 303           surface->impl->draw(i->pos.x, i->pos.y, i->alpha, i->drawing_effect);
 304         break;
 305       }
 306       case SURFACE_PART:
 307         draw_surface_part(*i);
 308         break;
 309       case GRADIENT:
 310         draw_gradient(*i);
 311         break;
 312       case TEXT:
 313         draw_text(*i);
 314         break;
 315       case FILLRECT:
 316         draw_filled_rect(*i);
 317         break;
 318     }
 319   }
 320
 321   // update screen
 322   if(use_gl)
 323     SDL_GL_SwapBuffers();
 324   else
 325     SDL_Flip(screen);
 326
 327   drawingrequests.clear();
 328 }
 329
 330 void
 331 DrawingContext::push_transform()
 332 {
 333   transformstack.push_back(transform);
 334 }
 335
 336 void
 337 DrawingContext::pop_transform()
 338 {
 339   assert(!transformstack.empty());
 340
 341   transform = transformstack.back();
 342   transformstack.pop_back();
 343 }
 344
 345 void
 346 DrawingContext::set_drawing_effect(int effect)
 347 {
 348   transform.draw_effect = effect;
 349 }
 350
 351 void
 352 DrawingContext::set_zooming(float zoom)
 353 {
 354   transform.zoom = zoom;
 355 }
 356
 357 void
 358 DrawingContext::set_alpha(int alpha)
 359 {
 360   transform.alpha = alpha;
 361 }