src/video/gl_lightmap.cpp

   1 //  $Id: gl_lightmap.cpp 5063 2007-05-27 11:32:00Z matzeb $
   2 //
   3 //  SuperTux
   4 //  Copyright (C) 2006 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 <config.h>
  20
  21 #ifdef HAVE_OPENGL
  22
  23 #include <functional>
  24 #include <algorithm>
  25 #include <cassert>
  26 #include <math.h>
  27 #include <iostream>
  28 #include <SDL_image.h>
  29 #include <sstream>
  30 #include <iomanip>
  31 #include <physfs.h>
  32
  33 #include "glutil.hpp"
  34 #include "gl_lightmap.hpp"
  35 #include "gl_surface_data.hpp"
  36 #include "drawing_context.hpp"
  37 #include "drawing_request.hpp"
  38 #include "renderer.hpp"
  39 #include "surface.hpp"
  40 #include "font.hpp"
  41 #include "main.hpp"
  42 #include "gameconfig.hpp"
  43 #include "gl_texture.hpp"
  44 #include "texture_manager.hpp"
  45 #include "obstack/obstackpp.hpp"
  46
  47 namespace
  48 {
  49
  50 inline void intern_draw(float left, float top, float right, float bottom,
  51                         float uv_left, float uv_top,
  52                         float uv_right, float uv_bottom,
  53                         float angle, float alpha,
  54                         const Color& color,
  55                         const Blend& blend,
  56                         DrawingEffect effect)
  57 {
  58   if(effect & HORIZONTAL_FLIP)
  59     std::swap(uv_left, uv_right);
  60
  61   if(effect & VERTICAL_FLIP)
  62     std::swap(uv_top, uv_bottom);
  63
  64   // unrotated blit
  65   glBlendFunc(blend.sfactor, blend.dfactor);
  66   glColor4f(color.red, color.green, color.blue, color.alpha * alpha);
  67
  68   if (angle == 0.0f) {
  69     float vertices[] = {
  70       left, top,
  71       right, top,
  72       right, bottom,
  73       left, bottom,
  74     };
  75     glVertexPointer(2, GL_FLOAT, 0, vertices);
  76
  77     float uvs[] = {
  78       uv_left, uv_top,
  79       uv_right, uv_top,
  80       uv_right, uv_bottom,
  81       uv_left, uv_bottom,
  82     };
  83     glTexCoordPointer(2, GL_FLOAT, 0, uvs);
  84
  85     glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
  86   } else {
  87     // rotated blit
  88     float center_x = (left + right) / 2;
  89     float center_y = (top + bottom) / 2;
  90
  91     float sa = sinf(angle/180.0f*M_PI);
  92     float ca = cosf(angle/180.0f*M_PI);
  93
  94     left  -= center_x;
  95     right -= center_x;
  96
  97     top    -= center_y;
  98     bottom -= center_y;
  99
 100     float vertices[] = {
 101                 left*ca - top*sa + center_x, left*sa + top*ca + center_y,
 102                 right*ca - top*sa + center_x, right*sa + top*ca + center_y,
 103                 right*ca - bottom*sa + center_x, right*sa + bottom*ca + center_y,
 104                 left*ca - bottom*sa + center_x, left*sa + bottom*ca + center_y
 105         };
 106     glVertexPointer(2, GL_FLOAT, 0, vertices);
 107
 108     float uvs[] = {
 109       uv_left, uv_top,
 110       uv_right, uv_top,
 111       uv_right, uv_bottom,
 112       uv_left, uv_bottom,
 113     };
 114     glTexCoordPointer(2, GL_FLOAT, 0, uvs);
 115
 116     glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
 117   }
 118
 119   // FIXME: find a better way to restore the blend mode
 120   glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
 121   glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 122 }
 123
 124 }
 125
 126 namespace GL
 127 {
 128   static inline int next_po2(int val)
 129   {
 130     int result = 1;
 131     while(result < val)
 132       result *= 2;
 133
 134     return result;
 135   }
 136
 137   Lightmap::Lightmap()
 138   {
 139     screen = SDL_GetVideoSurface();
 140
 141     lightmap_width = screen->w / LIGHTMAP_DIV;
 142     lightmap_height = screen->h / LIGHTMAP_DIV;
 143     unsigned int width = next_po2(lightmap_width);
 144     unsigned int height = next_po2(lightmap_height);
 145
 146     lightmap = new Texture(width, height);
 147
 148     lightmap_uv_right = static_cast<float>(lightmap_width) / static_cast<float>(width);
 149     lightmap_uv_bottom = static_cast<float>(lightmap_height) / static_cast<float>(height);
 150     texture_manager->register_texture(lightmap);
 151   }
 152
 153   Lightmap::~Lightmap()
 154   {
 155     texture_manager->remove_texture(lightmap);
 156     delete lightmap;
 157   }
 158
 159   void
 160   Lightmap::start_draw(const Color &ambient_color)
 161   {
 162     glViewport(0, screen->h - lightmap_height, lightmap_width, lightmap_height);
 163     glMatrixMode(GL_PROJECTION);
 164     glLoadIdentity();
 165     glOrtho(0, SCREEN_WIDTH, SCREEN_HEIGHT, 0, -1.0, 1.0);
 166     glMatrixMode(GL_MODELVIEW);
 167     glLoadIdentity();
 168
 169     glClearColor( ambient_color.red, ambient_color.green, ambient_color.blue, 1 );
 170     glClear(GL_COLOR_BUFFER_BIT);
 171   }
 172
 173   void
 174   Lightmap::end_draw()
 175   {
 176     glDisable(GL_BLEND);
 177     glBindTexture(GL_TEXTURE_2D, lightmap->get_handle());
 178     glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, screen->h - lightmap_height, lightmap_width, lightmap_height);
 179
 180     glViewport(0, 0, screen->w, screen->h);
 181     glMatrixMode(GL_PROJECTION);
 182     glLoadIdentity();
 183     glOrtho(0, SCREEN_WIDTH, SCREEN_HEIGHT, 0, -1.0, 1.0);
 184     glMatrixMode(GL_MODELVIEW);
 185     glLoadIdentity();
 186     glEnable(GL_BLEND);
 187     //glClear(GL_COLOR_BUFFER_BIT);
 188   }
 189
 190   void
 191   Lightmap::do_draw()
 192   {
 193     const Texture* texture = lightmap;
 194
 195     // multiple the lightmap with the framebuffer
 196     glBlendFunc(GL_DST_COLOR, GL_ZERO);
 197
 198     glBindTexture(GL_TEXTURE_2D, texture->get_handle());
 199
 200     float vertices[] = {
 201       0, 0,
 202       SCREEN_WIDTH, 0,
 203       SCREEN_WIDTH, SCREEN_HEIGHT,
 204       0, SCREEN_HEIGHT
 205     };
 206     glVertexPointer(2, GL_FLOAT, 0, vertices);
 207
 208     float uvs[] = {
 209       0,                 lightmap_uv_bottom,
 210       lightmap_uv_right, lightmap_uv_bottom,
 211       lightmap_uv_right, 0,
 212       0, 0
 213     };
 214     glTexCoordPointer(2, GL_FLOAT, 0, uvs);
 215
 216     glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
 217
 218     glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 219   }
 220
 221   void
 222   Lightmap::draw_surface(const DrawingRequest& request)
 223   {
 224     const Surface* surface = (const Surface*) request.request_data;
 225     GL::Texture *gltexture = dynamic_cast<GL::Texture *>(surface->get_texture());
 226     GL::SurfaceData *surface_data = reinterpret_cast<GL::SurfaceData *>(surface->get_surface_data());
 227
 228     glBindTexture(GL_TEXTURE_2D, gltexture->get_handle());
 229     intern_draw(request.pos.x, request.pos.y,
 230                 request.pos.x + surface->get_width(),
 231                 request.pos.y + surface->get_height(),
 232                 surface_data->get_uv_left(),
 233                 surface_data->get_uv_top(),
 234                 surface_data->get_uv_right(),
 235                 surface_data->get_uv_bottom(),
 236                 request.angle,
 237                 request.alpha,
 238                 request.color,
 239                 request.blend,
 240                 request.drawing_effect);
 241   }
 242
 243   void
 244   Lightmap::draw_surface_part(const DrawingRequest& request)
 245   {
 246     const SurfacePartRequest* surfacepartrequest
 247       = (SurfacePartRequest*) request.request_data;
 248     const Surface *surface = surfacepartrequest->surface;
 249     GL::Texture *gltexture = dynamic_cast<GL::Texture *>(surface->get_texture());
 250     GL::SurfaceData *surface_data = reinterpret_cast<GL::SurfaceData *>(surface->get_surface_data());
 251
 252     float uv_width = surface_data->get_uv_right() - surface_data->get_uv_left();
 253     float uv_height = surface_data->get_uv_bottom() - surface_data->get_uv_top();
 254
 255     float uv_left = surface_data->get_uv_left() + (uv_width * surfacepartrequest->source.x) / surface->get_width();
 256     float uv_top = surface_data->get_uv_top() + (uv_height * surfacepartrequest->source.y) / surface->get_height();
 257     float uv_right = surface_data->get_uv_left() + (uv_width * (surfacepartrequest->source.x + surfacepartrequest->size.x)) / surface->get_width();
 258     float uv_bottom = surface_data->get_uv_top() + (uv_height * (surfacepartrequest->source.y + surfacepartrequest->size.y)) / surface->get_height();
 259
 260     glBindTexture(GL_TEXTURE_2D, gltexture->get_handle());
 261     intern_draw(request.pos.x, request.pos.y,
 262                 request.pos.x + surfacepartrequest->size.x,
 263                 request.pos.y + surfacepartrequest->size.y,
 264                 uv_left,
 265                 uv_top,
 266                 uv_right,
 267                 uv_bottom,
 268                 0.0,
 269                 request.alpha,
 270                 Color(1.0, 1.0, 1.0),
 271                 Blend(),
 272                 request.drawing_effect);
 273   }
 274
 275   void
 276   Lightmap::draw_gradient(const DrawingRequest& request)
 277   {
 278     const GradientRequest* gradientrequest
 279       = (GradientRequest*) request.request_data;
 280     const Color& top = gradientrequest->top;
 281     const Color& bottom = gradientrequest->bottom;
 282
 283     glDisable(GL_TEXTURE_2D);
 284     glDisable(GL_TEXTURE_COORD_ARRAY);
 285     glEnable(GL_COLOR_ARRAY);
 286
 287     float vertices[] = {
 288       0, 0,
 289       SCREEN_WIDTH, 0,
 290       SCREEN_WIDTH, SCREEN_HEIGHT,
 291       0, SCREEN_HEIGHT
 292     };
 293     glVertexPointer(2, GL_FLOAT, 0, vertices);
 294
 295     float colors[] = {
 296       top.red, top.green, top.blue, top.alpha,
 297       top.red, top.green, top.blue, top.alpha,
 298       bottom.red, bottom.green, bottom.blue, bottom.alpha,
 299       bottom.red, bottom.green, bottom.blue, bottom.alpha,
 300     };
 301     glColorPointer(4, GL_FLOAT, 0, colors);
 302
 303     glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
 304
 305     glDisable(GL_COLOR_ARRAY);
 306     glEnable(GL_TEXTURE_COORD_ARRAY);
 307
 308     glEnable(GL_TEXTURE_2D);
 309     glColor4f(1, 1, 1, 1);
 310   }
 311
 312   void
 313   Lightmap::draw_filled_rect(const DrawingRequest& request)
 314   {
 315     const FillRectRequest* fillrectrequest
 316       = (FillRectRequest*) request.request_data;
 317
 318     float x = request.pos.x;
 319     float y = request.pos.y;
 320     float w = fillrectrequest->size.x;
 321     float h = fillrectrequest->size.y;
 322
 323     glDisable(GL_TEXTURE_2D);
 324     glColor4f(fillrectrequest->color.red, fillrectrequest->color.green,
 325               fillrectrequest->color.blue, fillrectrequest->color.alpha);
 326     glDisable(GL_TEXTURE_COORD_ARRAY);
 327
 328     float vertices[] = {
 329       x,   y,
 330       x+w, y,
 331       x+w, y+h,
 332       x,   y+h
 333     };
 334     glVertexPointer(2, GL_FLOAT, 0, vertices);
 335
 336     glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
 337
 338     glEnable(GL_TEXTURE_COORD_ARRAY);
 339     glEnable(GL_TEXTURE_2D);
 340     glColor4f(1, 1, 1, 1);
 341   }
 342
 343   void
 344   Lightmap::get_light(const DrawingRequest& request) const
 345   {
 346     const GetLightRequest* getlightrequest
 347       = (GetLightRequest*) request.request_data;
 348
 349     float pixels[3];
 350     for( int i = 0; i<3; i++)
 351       pixels[i] = 0.0f; //set to black
 352
 353     float posX = request.pos.x * lightmap_width / SCREEN_WIDTH;
 354     float posY = screen->h - request.pos.y * lightmap_height / SCREEN_HEIGHT;
 355     glReadPixels((GLint) posX, (GLint) posY , 1, 1, GL_RGB, GL_FLOAT, pixels);
 356     *(getlightrequest->color_ptr) = Color( pixels[0], pixels[1], pixels[2]);
 357   }
 358 }
 359
 360 #endif