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