src/video/gl/gl_lightmap.cpp

   1 //  SuperTux
   2 //  Copyright (C) 2006 Matthias Braun <matze@braunis.de>
   3 //
   4 //  This program is free software: you can redistribute it and/or modify
   5 //  it under the terms of the GNU General Public License as published by
   6 //  the Free Software Foundation, either version 3 of the License, or
   7 //  (at your option) any later version.
   8 //
   9 //  This program is distributed in the hope that it will be useful,
  10 //  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 //  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 //  GNU General Public License for more details.
  13 //
  14 //  You should have received a copy of the GNU General Public License
  15 //  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16
  17 #include "video/gl/gl_lightmap.hpp"
  18
  19 #include <SDL_image.h>
  20 #include <algorithm>
  21 #include <assert.h>
  22 #include <functional>
  23 #include <iomanip>
  24 #include <iostream>
  25 #include <math.h>
  26 #include <physfs.h>
  27 #include <sstream>
  28
  29 #include "supertux/gameconfig.hpp"
  30 #include "supertux/globals.hpp"
  31 #include "util/obstackpp.hpp"
  32 #include "video/drawing_context.hpp"
  33 #include "video/drawing_request.hpp"
  34 #include "video/font.hpp"
  35 #include "video/gl/gl_surface_data.hpp"
  36 #include "video/gl/gl_texture.hpp"
  37 #include "video/glutil.hpp"
  38 #include "video/lightmap.hpp"
  39 #include "video/renderer.hpp"
  40 #include "video/surface.hpp"
  41 #include "video/texture_manager.hpp"
  42
  43 namespace {
  44
  45 inline void intern_draw(float left, float top, float right, float bottom,
  46                         float uv_left, float uv_top,
  47                         float uv_right, float uv_bottom,
  48                         float angle, float alpha,
  49                         const Color& color,
  50                         const Blend& blend,
  51                         DrawingEffect effect)
  52 {
  53   if(effect & HORIZONTAL_FLIP)
  54     std::swap(uv_left, uv_right);
  55
  56   if(effect & VERTICAL_FLIP)
  57     std::swap(uv_top, uv_bottom);
  58
  59   // unrotated blit
  60   glBlendFunc(blend.sfactor, blend.dfactor);
  61   glColor4f(color.red, color.green, color.blue, color.alpha * alpha);
  62
  63   if (angle == 0.0f) {
  64     float vertices[] = {
  65       left, top,
  66       right, top,
  67       right, bottom,
  68       left, bottom,
  69     };
  70     glVertexPointer(2, GL_FLOAT, 0, vertices);
  71
  72     float uvs[] = {
  73       uv_left, uv_top,
  74       uv_right, uv_top,
  75       uv_right, uv_bottom,
  76       uv_left, uv_bottom,
  77     };
  78     glTexCoordPointer(2, GL_FLOAT, 0, uvs);
  79
  80     glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
  81   } else {
  82     // rotated blit
  83     float center_x = (left + right) / 2;
  84     float center_y = (top + bottom) / 2;
  85
  86     float sa = sinf(angle/180.0f*M_PI);
  87     float ca = cosf(angle/180.0f*M_PI);
  88
  89     left  -= center_x;
  90     right -= center_x;
  91
  92     top    -= center_y;
  93     bottom -= center_y;
  94
  95     float vertices[] = {
  96       left*ca - top*sa + center_x, left*sa + top*ca + center_y,
  97       right*ca - top*sa + center_x, right*sa + top*ca + center_y,
  98       right*ca - bottom*sa + center_x, right*sa + bottom*ca + center_y,
  99       left*ca - bottom*sa + center_x, left*sa + bottom*ca + center_y
 100     };
 101     glVertexPointer(2, GL_FLOAT, 0, vertices);
 102
 103     float uvs[] = {
 104       uv_left, uv_top,
 105       uv_right, uv_top,
 106       uv_right, uv_bottom,
 107       uv_left, uv_bottom,
 108     };
 109     glTexCoordPointer(2, GL_FLOAT, 0, uvs);
 110
 111     glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
 112   }
 113
 114   // FIXME: find a better way to restore the blend mode
 115   glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
 116   glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 117 }
 118
 119 static inline int next_po2(int val)
 120 {
 121   int result = 1;
 122   while(result < val)
 123     result *= 2;
 124
 125   return result;
 126 }
 127
 128 } // namespace
 129
 130 GLLightmap::GLLightmap() :
 131   screen(),
 132   lightmap(),
 133   lightmap_width(),
 134   lightmap_height(),
 135   lightmap_uv_right(),
 136   lightmap_uv_bottom()
 137 {
 138   screen = SDL_GetVideoSurface();
 139
 140   lightmap_width = screen->w / LIGHTMAP_DIV;
 141   lightmap_height = screen->h / LIGHTMAP_DIV;
 142   unsigned int width = next_po2(lightmap_width);
 143   unsigned int height = next_po2(lightmap_height);
 144
 145   lightmap.reset(new GLTexture(width, height));
 146
 147   lightmap_uv_right = static_cast<float>(lightmap_width) / static_cast<float>(width);
 148   lightmap_uv_bottom = static_cast<float>(lightmap_height) / static_cast<float>(height);
 149   texture_manager->register_texture(lightmap.get());
 150 }
 151
 152 GLLightmap::~GLLightmap()
 153 {
 154 }
 155
 156 void
 157 GLLightmap::start_draw(const Color &ambient_color)
 158 {
 159   glViewport(0, screen->h - lightmap_height, lightmap_width, lightmap_height);
 160   glMatrixMode(GL_PROJECTION);
 161   glLoadIdentity();
 162 #ifdef GL_VERSION_ES_CM_1_0
 163   glOrthof(0, SCREEN_WIDTH, SCREEN_HEIGHT, 0, -1.0, 1.0);
 164 #else
 165   glOrtho(0, SCREEN_WIDTH, SCREEN_HEIGHT, 0, -1.0, 1.0);
 166 #endif
 167   glMatrixMode(GL_MODELVIEW);
 168   glLoadIdentity();
 169
 170   glClearColor( ambient_color.red, ambient_color.green, ambient_color.blue, 1 );
 171   glClear(GL_COLOR_BUFFER_BIT);
 172 }
 173
 174 void
 175 GLLightmap::end_draw()
 176 {
 177   glDisable(GL_BLEND);
 178   glBindTexture(GL_TEXTURE_2D, lightmap->get_handle());
 179   glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, screen->h - lightmap_height, lightmap_width, lightmap_height);
 180
 181   glViewport(0, 0, screen->w, screen->h);
 182   glMatrixMode(GL_PROJECTION);
 183   glLoadIdentity();
 184 #ifdef GL_VERSION_ES_CM_1_0
 185   glOrthof(0, SCREEN_WIDTH, SCREEN_HEIGHT, 0, -1.0, 1.0);
 186 #else
 187   glOrtho(0, SCREEN_WIDTH, SCREEN_HEIGHT, 0, -1.0, 1.0);
 188 #endif
 189   glMatrixMode(GL_MODELVIEW);
 190   glLoadIdentity();
 191   glEnable(GL_BLEND);
 192   //glClear(GL_COLOR_BUFFER_BIT);
 193 }
 194
 195 void
 196 GLLightmap::do_draw()
 197 {
 198   // multiple the lightmap with the framebuffer
 199   glBlendFunc(GL_DST_COLOR, GL_ZERO);
 200
 201   glBindTexture(GL_TEXTURE_2D, lightmap->get_handle());
 202
 203   float vertices[] = {
 204     0, 0,
 205     SCREEN_WIDTH, 0,
 206     SCREEN_WIDTH, SCREEN_HEIGHT,
 207     0, SCREEN_HEIGHT
 208   };
 209   glVertexPointer(2, GL_FLOAT, 0, vertices);
 210
 211   float uvs[] = {
 212     0,                 lightmap_uv_bottom,
 213     lightmap_uv_right, lightmap_uv_bottom,
 214     lightmap_uv_right, 0,
 215     0, 0
 216   };
 217   glTexCoordPointer(2, GL_FLOAT, 0, uvs);
 218
 219   glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
 220
 221   glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 222 }
 223
 224 void
 225 GLLightmap::draw_surface(const DrawingRequest& request)
 226 {
 227   const Surface* surface = (const Surface*) request.request_data;
 228   boost::shared_ptr<GLTexture> gltexture = boost::dynamic_pointer_cast<GLTexture>(surface->get_texture());
 229   GLSurfaceData *surface_data = reinterpret_cast<GLSurfaceData *>(surface->get_surface_data());
 230
 231   glBindTexture(GL_TEXTURE_2D, gltexture->get_handle());
 232   intern_draw(request.pos.x, request.pos.y,
 233               request.pos.x + surface->get_width(),
 234               request.pos.y + surface->get_height(),
 235               surface_data->get_uv_left(),
 236               surface_data->get_uv_top(),
 237               surface_data->get_uv_right(),
 238               surface_data->get_uv_bottom(),
 239               request.angle,
 240               request.alpha,
 241               request.color,
 242               request.blend,
 243               request.drawing_effect);
 244 }
 245
 246 void
 247 GLLightmap::draw_surface_part(const DrawingRequest& request)
 248 {
 249   const SurfacePartRequest* surfacepartrequest
 250     = (SurfacePartRequest*) request.request_data;
 251   const Surface* surface = surfacepartrequest->surface;
 252   boost::shared_ptr<GLTexture> gltexture = boost::dynamic_pointer_cast<GLTexture>(surface->get_texture());
 253   GLSurfaceData *surface_data = reinterpret_cast<GLSurfaceData *>(surface->get_surface_data());
 254
 255   float uv_width = surface_data->get_uv_right() - surface_data->get_uv_left();
 256   float uv_height = surface_data->get_uv_bottom() - surface_data->get_uv_top();
 257
 258   float uv_left = surface_data->get_uv_left() + (uv_width * surfacepartrequest->source.x) / surface->get_width();
 259   float uv_top = surface_data->get_uv_top() + (uv_height * surfacepartrequest->source.y) / surface->get_height();
 260   float uv_right = surface_data->get_uv_left() + (uv_width * (surfacepartrequest->source.x + surfacepartrequest->size.x)) / surface->get_width();
 261   float uv_bottom = surface_data->get_uv_top() + (uv_height * (surfacepartrequest->source.y + surfacepartrequest->size.y)) / surface->get_height();
 262
 263   glBindTexture(GL_TEXTURE_2D, gltexture->get_handle());
 264   intern_draw(request.pos.x, request.pos.y,
 265               request.pos.x + surfacepartrequest->size.x,
 266               request.pos.y + surfacepartrequest->size.y,
 267               uv_left,
 268               uv_top,
 269               uv_right,
 270               uv_bottom,
 271               0.0,
 272               request.alpha,
 273               Color(1.0, 1.0, 1.0),
 274               Blend(),
 275               request.drawing_effect);
 276 }
 277
 278 void
 279 GLLightmap::draw_gradient(const DrawingRequest& request)
 280 {
 281   const GradientRequest* gradientrequest
 282     = (GradientRequest*) request.request_data;
 283   const Color& top = gradientrequest->top;
 284   const Color& bottom = gradientrequest->bottom;
 285
 286   glDisable(GL_TEXTURE_2D);
 287   glDisable(GL_TEXTURE_COORD_ARRAY);
 288   glEnable(GL_COLOR_ARRAY);
 289
 290   float vertices[] = {
 291     0, 0,
 292     SCREEN_WIDTH, 0,
 293     SCREEN_WIDTH, SCREEN_HEIGHT,
 294     0, SCREEN_HEIGHT
 295   };
 296   glVertexPointer(2, GL_FLOAT, 0, vertices);
 297
 298   float colors[] = {
 299     top.red, top.green, top.blue, top.alpha,
 300     top.red, top.green, top.blue, top.alpha,
 301     bottom.red, bottom.green, bottom.blue, bottom.alpha,
 302     bottom.red, bottom.green, bottom.blue, bottom.alpha,
 303   };
 304   glColorPointer(4, GL_FLOAT, 0, colors);
 305
 306   glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
 307
 308   glDisable(GL_COLOR_ARRAY);
 309   glEnable(GL_TEXTURE_COORD_ARRAY);
 310
 311   glEnable(GL_TEXTURE_2D);
 312   glColor4f(1, 1, 1, 1);
 313 }
 314
 315 void
 316 GLLightmap::draw_filled_rect(const DrawingRequest& request)
 317 {
 318   const FillRectRequest* fillrectrequest
 319     = (FillRectRequest*) request.request_data;
 320
 321   float x = request.pos.x;
 322   float y = request.pos.y;
 323   float w = fillrectrequest->size.x;
 324   float h = fillrectrequest->size.y;
 325
 326   glDisable(GL_TEXTURE_2D);
 327   glColor4f(fillrectrequest->color.red, fillrectrequest->color.green,
 328             fillrectrequest->color.blue, fillrectrequest->color.alpha);
 329   glDisable(GL_TEXTURE_COORD_ARRAY);
 330
 331   float vertices[] = {
 332     x,   y,
 333     x+w, y,
 334     x+w, y+h,
 335     x,   y+h
 336   };
 337   glVertexPointer(2, GL_FLOAT, 0, vertices);
 338
 339   glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
 340
 341   glEnable(GL_TEXTURE_COORD_ARRAY);
 342   glEnable(GL_TEXTURE_2D);
 343   glColor4f(1, 1, 1, 1);
 344 }
 345
 346 void
 347 GLLightmap::get_light(const DrawingRequest& request) const
 348 {
 349   const GetLightRequest* getlightrequest
 350     = (GetLightRequest*) request.request_data;
 351
 352   float pixels[3];
 353   for( int i = 0; i<3; i++)
 354     pixels[i] = 0.0f; //set to black
 355
 356   float posX = request.pos.x * lightmap_width / SCREEN_WIDTH;
 357   float posY = screen->h - request.pos.y * lightmap_height / SCREEN_HEIGHT;
 358   glReadPixels((GLint) posX, (GLint) posY , 1, 1, GL_RGB, GL_FLOAT, pixels);
 359   *(getlightrequest->color_ptr) = Color( pixels[0], pixels[1], pixels[2]);
 360 }
 361
 362 /* EOF */