src/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   inline void intern_draw(float left, float top, float right, float bottom,
  50                                   float uv_left, float uv_top,
  51                                   float uv_right, float uv_bottom,
  52                                   float angle, float alpha,
  53                                   const Color& color,
  54                                   const Blend& blend,
  55                                   DrawingEffect effect)
  56   {
  57     if(effect & HORIZONTAL_FLIP)
  58       std::swap(uv_left, uv_right);
  59     if(effect & VERTICAL_FLIP) {
  60       std::swap(uv_top, uv_bottom);
  61     }
  62
  63     float center_x = (left + right) / 2;
  64     float center_y = (top + bottom) / 2;
  65
  66     float sa = sinf(angle/180.0f*M_PI);
  67     float ca = cosf(angle/180.0f*M_PI);
  68
  69     left  -= center_x;
  70     right -= center_x;
  71
  72     top    -= center_y;
  73     bottom -= center_y;
  74
  75     glBlendFunc(blend.sfactor, blend.dfactor);
  76     glColor4f(color.red, color.green, color.blue, color.alpha * alpha);
  77     glBegin(GL_QUADS);
  78     glTexCoord2f(uv_left, uv_top);
  79     glVertex2f(left*ca - top*sa + center_x,
  80                left*sa + top*ca + center_y);
  81
  82     glTexCoord2f(uv_right, uv_top);
  83     glVertex2f(right*ca - top*sa + center_x,
  84                right*sa + top*ca + center_y);
  85
  86     glTexCoord2f(uv_right, uv_bottom);
  87     glVertex2f(right*ca - bottom*sa + center_x,
  88                right*sa + bottom*ca + center_y);
  89
  90     glTexCoord2f(uv_left, uv_bottom);
  91     glVertex2f(left*ca - bottom*sa + center_x,
  92                left*sa + bottom*ca + center_y);
  93     glEnd();
  94
  95     // FIXME: find a better way to restore the blend mode
  96     glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
  97     glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
  98   }
  99 }
 100
 101 namespace GL
 102 {
 103   static inline int next_po2(int val)
 104   {
 105     int result = 1;
 106     while(result < val)
 107       result *= 2;
 108
 109     return result;
 110   }
 111
 112   Lightmap::Lightmap()
 113   {
 114     screen = SDL_GetVideoSurface();
 115
 116     lightmap_width = screen->w / LIGHTMAP_DIV;
 117     lightmap_height = screen->h / LIGHTMAP_DIV;
 118     unsigned int width = next_po2(lightmap_width);
 119     unsigned int height = next_po2(lightmap_height);
 120
 121     lightmap = new Texture(width, height);
 122
 123     lightmap_uv_right = static_cast<float>(lightmap_width) / static_cast<float>(width);
 124     lightmap_uv_bottom = static_cast<float>(lightmap_height) / static_cast<float>(height);
 125     texture_manager->register_texture(lightmap);
 126   }
 127
 128   Lightmap::~Lightmap()
 129   {
 130     texture_manager->remove_texture(lightmap);
 131     delete lightmap;
 132   }
 133
 134   void
 135   Lightmap::start_draw(const Color &ambient_color)
 136   {
 137     glViewport(0, screen->h - lightmap_height, lightmap_width, lightmap_height);
 138     glMatrixMode(GL_PROJECTION);
 139     glLoadIdentity();
 140     glOrtho(0, SCREEN_WIDTH, SCREEN_HEIGHT, 0, -1.0, 1.0);
 141     glMatrixMode(GL_MODELVIEW);
 142     glLoadIdentity();
 143
 144     glClearColor( ambient_color.red, ambient_color.green, ambient_color.blue, 1 );
 145     glClear(GL_COLOR_BUFFER_BIT);
 146   }
 147
 148   void
 149   Lightmap::end_draw()
 150   {
 151     glDisable(GL_BLEND);
 152     glBindTexture(GL_TEXTURE_2D, lightmap->get_handle());
 153     glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, screen->h - lightmap_height, lightmap_width, lightmap_height);
 154
 155     glViewport(0, 0, screen->w, screen->h);
 156     glMatrixMode(GL_PROJECTION);
 157     glLoadIdentity();
 158     glOrtho(0, SCREEN_WIDTH, SCREEN_HEIGHT, 0, -1.0, 1.0);
 159     glMatrixMode(GL_MODELVIEW);
 160     glLoadIdentity();
 161     glEnable(GL_BLEND);
 162     //glClear(GL_COLOR_BUFFER_BIT);
 163   }
 164
 165   void
 166   Lightmap::do_draw()
 167   {
 168     const Texture* texture = lightmap;
 169
 170     // multiple the lightmap with the framebuffer
 171     glBlendFunc(GL_DST_COLOR, GL_ZERO);
 172
 173     glBindTexture(GL_TEXTURE_2D, texture->get_handle());
 174     glBegin(GL_QUADS);
 175
 176     glTexCoord2f(0, lightmap_uv_bottom);
 177     glVertex2f(0, 0);
 178
 179     glTexCoord2f(lightmap_uv_right, lightmap_uv_bottom);
 180     glVertex2f(SCREEN_WIDTH, 0);
 181
 182     glTexCoord2f(lightmap_uv_right, 0);
 183     glVertex2f(SCREEN_WIDTH, SCREEN_HEIGHT);
 184
 185     glTexCoord2f(0, 0);
 186     glVertex2f(0, SCREEN_HEIGHT);
 187
 188     glEnd();
 189
 190     glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 191   }
 192
 193   void
 194   Lightmap::draw_surface(const DrawingRequest& request)
 195   {
 196     const Surface* surface = (const Surface*) request.request_data;
 197     GL::Texture *gltexture = dynamic_cast<GL::Texture *>(surface->get_texture());
 198     GL::SurfaceData *surface_data = reinterpret_cast<GL::SurfaceData *>(surface->get_surface_data());
 199
 200     glBindTexture(GL_TEXTURE_2D, gltexture->get_handle());
 201     intern_draw(request.pos.x, request.pos.y,
 202                 request.pos.x + surface->get_width(),
 203                 request.pos.y + surface->get_height(),
 204                 surface_data->get_uv_left(),
 205                 surface_data->get_uv_top(),
 206                 surface_data->get_uv_right(),
 207                 surface_data->get_uv_bottom(),
 208                 request.angle,
 209                 request.alpha,
 210                 request.color,
 211                 request.blend,
 212                 request.drawing_effect);
 213   }
 214
 215   void
 216   Lightmap::draw_surface_part(const DrawingRequest& request)
 217   {
 218     const SurfacePartRequest* surfacepartrequest
 219       = (SurfacePartRequest*) request.request_data;
 220     const Surface *surface = surfacepartrequest->surface;
 221     GL::Texture *gltexture = dynamic_cast<GL::Texture *>(surface->get_texture());
 222     GL::SurfaceData *surface_data = reinterpret_cast<GL::SurfaceData *>(surface->get_surface_data());
 223
 224     float uv_width = surface_data->get_uv_right() - surface_data->get_uv_left();
 225     float uv_height = surface_data->get_uv_bottom() - surface_data->get_uv_top();
 226
 227     float uv_left = surface_data->get_uv_left() + (uv_width * surfacepartrequest->source.x) / surface->get_width();
 228     float uv_top = surface_data->get_uv_top() + (uv_height * surfacepartrequest->source.y) / surface->get_height();
 229     float uv_right = surface_data->get_uv_left() + (uv_width * (surfacepartrequest->source.x + surfacepartrequest->size.x)) / surface->get_width();
 230     float uv_bottom = surface_data->get_uv_top() + (uv_height * (surfacepartrequest->source.y + surfacepartrequest->size.y)) / surface->get_height();
 231
 232     glBindTexture(GL_TEXTURE_2D, gltexture->get_handle());
 233     intern_draw(request.pos.x, request.pos.y,
 234                 request.pos.x + surfacepartrequest->size.x,
 235                 request.pos.y + surfacepartrequest->size.y,
 236                 uv_left,
 237                 uv_top,
 238                 uv_right,
 239                 uv_bottom,
 240                 0.0,
 241                 request.alpha,
 242                 Color(1.0, 1.0, 1.0),
 243                 Blend(),
 244                 request.drawing_effect);
 245   }
 246
 247   void
 248   Lightmap::draw_gradient(const DrawingRequest& request)
 249   {
 250     const GradientRequest* gradientrequest
 251       = (GradientRequest*) request.request_data;
 252     const Color& top = gradientrequest->top;
 253     const Color& bottom = gradientrequest->bottom;
 254
 255     glDisable(GL_TEXTURE_2D);
 256     glBegin(GL_QUADS);
 257     glColor4f(top.red, top.green, top.blue, top.alpha);
 258     glVertex2f(0, 0);
 259     glVertex2f(SCREEN_WIDTH, 0);
 260     glColor4f(bottom.red, bottom.green, bottom.blue, bottom.alpha);
 261     glVertex2f(SCREEN_WIDTH, SCREEN_HEIGHT);
 262     glVertex2f(0, SCREEN_HEIGHT);
 263     glEnd();
 264     glEnable(GL_TEXTURE_2D);
 265     glColor4f(1, 1, 1, 1);
 266   }
 267
 268   void
 269   Lightmap::draw_filled_rect(const DrawingRequest& request)
 270   {
 271     const FillRectRequest* fillrectrequest
 272       = (FillRectRequest*) request.request_data;
 273
 274     float x = request.pos.x;
 275     float y = request.pos.y;
 276     float w = fillrectrequest->size.x;
 277     float h = fillrectrequest->size.y;
 278
 279     glDisable(GL_TEXTURE_2D);
 280     glColor4f(fillrectrequest->color.red, fillrectrequest->color.green,
 281               fillrectrequest->color.blue, fillrectrequest->color.alpha);
 282
 283     glBegin(GL_QUADS);
 284     glVertex2f(x, y);
 285     glVertex2f(x+w, y);
 286     glVertex2f(x+w, y+h);
 287     glVertex2f(x, y+h);
 288     glEnd();
 289     glEnable(GL_TEXTURE_2D);
 290     glColor4f(1, 1, 1, 1);
 291   }
 292
 293   void
 294   Lightmap::get_light(const DrawingRequest& request) const
 295   {
 296     const GetLightRequest* getlightrequest
 297       = (GetLightRequest*) request.request_data;
 298
 299     float pixels[3];
 300     for( int i = 0; i<3; i++)
 301       pixels[i] = 0.0f; //set to black
 302
 303     float posX = request.pos.x * lightmap_width / SCREEN_WIDTH;
 304     float posY = screen->h - request.pos.y * lightmap_height / SCREEN_HEIGHT;
 305     glReadPixels((GLint) posX, (GLint) posY , 1, 1, GL_RGB, GL_FLOAT, pixels);
 306     *(getlightrequest->color_ptr) = Color( pixels[0], pixels[1], pixels[2]);
 307     //printf("get_light %f/%f =>%f/%f r%f g%f b%f\n", request.pos.x, request.pos.y, posX, posY, pixels[0], pixels[1], pixels[2]);
 308   }
 309 }
 310
 311 #endif