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