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