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