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 #ifdef GL_VERSION_ES_CM_1_0
 166     glOrthof(0, SCREEN_WIDTH, SCREEN_HEIGHT, 0, -1.0, 1.0);
 167 #else
 168     glOrtho(0, SCREEN_WIDTH, SCREEN_HEIGHT, 0, -1.0, 1.0);
 169 #endif
 170     glMatrixMode(GL_MODELVIEW);
 171     glLoadIdentity();
 172
 173     glClearColor( ambient_color.red, ambient_color.green, ambient_color.blue, 1 );
 174     glClear(GL_COLOR_BUFFER_BIT);
 175   }
 176
 177   void
 178   Lightmap::end_draw()
 179   {
 180     glDisable(GL_BLEND);
 181     glBindTexture(GL_TEXTURE_2D, lightmap->get_handle());
 182     glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, screen->h - lightmap_height, lightmap_width, lightmap_height);
 183
 184     glViewport(0, 0, screen->w, screen->h);
 185     glMatrixMode(GL_PROJECTION);
 186     glLoadIdentity();
 187 #ifdef GL_VERSION_ES_CM_1_0
 188     glOrthof(0, SCREEN_WIDTH, SCREEN_HEIGHT, 0, -1.0, 1.0);
 189 #else
 190     glOrtho(0, SCREEN_WIDTH, SCREEN_HEIGHT, 0, -1.0, 1.0);
 191 #endif
 192     glMatrixMode(GL_MODELVIEW);
 193     glLoadIdentity();
 194     glEnable(GL_BLEND);
 195     //glClear(GL_COLOR_BUFFER_BIT);
 196   }
 197
 198   void
 199   Lightmap::do_draw()
 200   {
 201     const Texture* texture = lightmap;
 202
 203     // multiple the lightmap with the framebuffer
 204     glBlendFunc(GL_DST_COLOR, GL_ZERO);
 205
 206     glBindTexture(GL_TEXTURE_2D, texture->get_handle());
 207
 208     float vertices[] = {
 209       0, 0,
 210       SCREEN_WIDTH, 0,
 211       SCREEN_WIDTH, SCREEN_HEIGHT,
 212       0, SCREEN_HEIGHT
 213     };
 214     glVertexPointer(2, GL_FLOAT, 0, vertices);
 215
 216     float uvs[] = {
 217       0,                 lightmap_uv_bottom,
 218       lightmap_uv_right, lightmap_uv_bottom,
 219       lightmap_uv_right, 0,
 220       0, 0
 221     };
 222     glTexCoordPointer(2, GL_FLOAT, 0, uvs);
 223
 224     glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
 225
 226     glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 227   }
 228
 229   void
 230   Lightmap::draw_surface(const DrawingRequest& request)
 231   {
 232     const Surface* surface = (const Surface*) request.request_data;
 233     GL::Texture *gltexture = dynamic_cast<GL::Texture *>(surface->get_texture());
 234     GL::SurfaceData *surface_data = reinterpret_cast<GL::SurfaceData *>(surface->get_surface_data());
 235
 236     glBindTexture(GL_TEXTURE_2D, gltexture->get_handle());
 237     intern_draw(request.pos.x, request.pos.y,
 238                 request.pos.x + surface->get_width(),
 239                 request.pos.y + surface->get_height(),
 240                 surface_data->get_uv_left(),
 241                 surface_data->get_uv_top(),
 242                 surface_data->get_uv_right(),
 243                 surface_data->get_uv_bottom(),
 244                 request.angle,
 245                 request.alpha,
 246                 request.color,
 247                 request.blend,
 248                 request.drawing_effect);
 249   }
 250
 251   void
 252   Lightmap::draw_surface_part(const DrawingRequest& request)
 253   {
 254     const SurfacePartRequest* surfacepartrequest
 255       = (SurfacePartRequest*) request.request_data;
 256     const Surface *surface = surfacepartrequest->surface;
 257     GL::Texture *gltexture = dynamic_cast<GL::Texture *>(surface->get_texture());
 258     GL::SurfaceData *surface_data = reinterpret_cast<GL::SurfaceData *>(surface->get_surface_data());
 259
 260     float uv_width = surface_data->get_uv_right() - surface_data->get_uv_left();
 261     float uv_height = surface_data->get_uv_bottom() - surface_data->get_uv_top();
 262
 263     float uv_left = surface_data->get_uv_left() + (uv_width * surfacepartrequest->source.x) / surface->get_width();
 264     float uv_top = surface_data->get_uv_top() + (uv_height * surfacepartrequest->source.y) / surface->get_height();
 265     float uv_right = surface_data->get_uv_left() + (uv_width * (surfacepartrequest->source.x + surfacepartrequest->size.x)) / surface->get_width();
 266     float uv_bottom = surface_data->get_uv_top() + (uv_height * (surfacepartrequest->source.y + surfacepartrequest->size.y)) / surface->get_height();
 267
 268     glBindTexture(GL_TEXTURE_2D, gltexture->get_handle());
 269     intern_draw(request.pos.x, request.pos.y,
 270                 request.pos.x + surfacepartrequest->size.x,
 271                 request.pos.y + surfacepartrequest->size.y,
 272                 uv_left,
 273                 uv_top,
 274                 uv_right,
 275                 uv_bottom,
 276                 0.0,
 277                 request.alpha,
 278                 Color(1.0, 1.0, 1.0),
 279                 Blend(),
 280                 request.drawing_effect);
 281   }
 282
 283   void
 284   Lightmap::draw_gradient(const DrawingRequest& request)
 285   {
 286     const GradientRequest* gradientrequest
 287       = (GradientRequest*) request.request_data;
 288     const Color& top = gradientrequest->top;
 289     const Color& bottom = gradientrequest->bottom;
 290
 291     glDisable(GL_TEXTURE_2D);
 292     glDisable(GL_TEXTURE_COORD_ARRAY);
 293     glEnable(GL_COLOR_ARRAY);
 294
 295     float vertices[] = {
 296       0, 0,
 297       SCREEN_WIDTH, 0,
 298       SCREEN_WIDTH, SCREEN_HEIGHT,
 299       0, SCREEN_HEIGHT
 300     };
 301     glVertexPointer(2, GL_FLOAT, 0, vertices);
 302
 303     float colors[] = {
 304       top.red, top.green, top.blue, top.alpha,
 305       top.red, top.green, top.blue, top.alpha,
 306       bottom.red, bottom.green, bottom.blue, bottom.alpha,
 307       bottom.red, bottom.green, bottom.blue, bottom.alpha,
 308     };
 309     glColorPointer(4, GL_FLOAT, 0, colors);
 310
 311     glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
 312
 313     glDisable(GL_COLOR_ARRAY);
 314     glEnable(GL_TEXTURE_COORD_ARRAY);
 315
 316     glEnable(GL_TEXTURE_2D);
 317     glColor4f(1, 1, 1, 1);
 318   }
 319
 320   void
 321   Lightmap::draw_filled_rect(const DrawingRequest& request)
 322   {
 323     const FillRectRequest* fillrectrequest
 324       = (FillRectRequest*) request.request_data;
 325
 326     float x = request.pos.x;
 327     float y = request.pos.y;
 328     float w = fillrectrequest->size.x;
 329     float h = fillrectrequest->size.y;
 330
 331     glDisable(GL_TEXTURE_2D);
 332     glColor4f(fillrectrequest->color.red, fillrectrequest->color.green,
 333               fillrectrequest->color.blue, fillrectrequest->color.alpha);
 334     glDisable(GL_TEXTURE_COORD_ARRAY);
 335
 336     float vertices[] = {
 337       x,   y,
 338       x+w, y,
 339       x+w, y+h,
 340       x,   y+h
 341     };
 342     glVertexPointer(2, GL_FLOAT, 0, vertices);
 343
 344     glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
 345
 346     glEnable(GL_TEXTURE_COORD_ARRAY);
 347     glEnable(GL_TEXTURE_2D);
 348     glColor4f(1, 1, 1, 1);
 349   }
 350
 351   void
 352   Lightmap::get_light(const DrawingRequest& request) const
 353   {
 354     const GetLightRequest* getlightrequest
 355       = (GetLightRequest*) request.request_data;
 356
 357     float pixels[3];
 358     for( int i = 0; i<3; i++)
 359       pixels[i] = 0.0f; //set to black
 360
 361     float posX = request.pos.x * lightmap_width / SCREEN_WIDTH;
 362     float posY = screen->h - request.pos.y * lightmap_height / SCREEN_HEIGHT;
 363     glReadPixels((GLint) posX, (GLint) posY , 1, 1, GL_RGB, GL_FLOAT, pixels);
 364     *(getlightrequest->color_ptr) = Color( pixels[0], pixels[1], pixels[2]);
 365   }
 366 }
 367
 368 #endif