src/video/texture_manager.cpp

   1 #include <config.h>
   2
   3 #include "texture_manager.hpp"
   4
   5 #include <assert.h>
   6 #include <SDL.h>
   7 #include <SDL_image.h>
   8 #include <GL/gl.h>
   9 #include <GL/glext.h>
  10 #include <iostream>
  11 #include <sstream>
  12 #include <stdexcept>
  13 #include "physfs/physfs_sdl.hpp"
  14 #include "image_texture.hpp"
  15 #include "glutil.hpp"
  16 #include "file_system.hpp"
  17
  18 TextureManager* texture_manager = NULL;
  19
  20 TextureManager::TextureManager()
  21 {
  22 }
  23
  24 TextureManager::~TextureManager()
  25 {
  26   for(ImageTextures::iterator i = image_textures.begin();
  27       i != image_textures.end(); ++i) {
  28     if(i->second == NULL)
  29       continue;
  30 #ifdef DEBUG
  31     std::cerr << "Warning: Texture '" << i->first << "' not freed\n";
  32 #endif
  33     delete i->second;
  34   }
  35 }
  36
  37 ImageTexture*
  38 TextureManager::get(const std::string& _filename)
  39 {
  40   std::string filename = FileSystem::normalize(_filename);
  41   ImageTextures::iterator i = image_textures.find(filename);
  42
  43   ImageTexture* texture = NULL;
  44   if(i != image_textures.end())
  45     texture = i->second;
  46
  47   if(texture == NULL) {
  48     texture = create_image_texture(filename);
  49     image_textures[filename] = texture;
  50   }
  51
  52   return texture;
  53 }
  54
  55 void
  56 TextureManager::release(ImageTexture* texture)
  57 {
  58   image_textures[texture->filename] = NULL;
  59   delete texture;
  60 }
  61
  62 void
  63 TextureManager::register_texture(Texture* texture)
  64 {
  65   textures.insert(texture);
  66 }
  67
  68 void
  69 TextureManager::remove_texture(Texture* texture)
  70 {
  71   textures.erase(texture);
  72 }
  73
  74 static inline int next_power_of_two(int val)
  75 {
  76   int result = 1;
  77   while(result < val)
  78     result *= 2;
  79   return result;
  80 }
  81
  82 ImageTexture*
  83 TextureManager::create_image_texture(const std::string& filename)
  84 {
  85   SDL_Surface* image = IMG_Load_RW(get_physfs_SDLRWops(filename), 1);
  86   if(image == NULL) {
  87     std::ostringstream msg;
  88     msg << "Couldn't load image '" << filename << "' :" << SDL_GetError();
  89     throw std::runtime_error(msg.str());
  90   }
  91
  92   int texture_w = next_power_of_two(image->w);
  93   int texture_h = next_power_of_two(image->h);
  94
  95 #if SDL_BYTEORDER == SDL_BIG_ENDIAN
  96   SDL_Surface* convert = SDL_CreateRGBSurface(SDL_SWSURFACE,
  97       texture_w, texture_h, 32,
  98       0xff000000, 0x00ff0000, 0x0000ff00, 0x000000ff);
  99 #else
 100   SDL_Surface* convert = SDL_CreateRGBSurface(SDL_SWSURFACE,
 101       texture_w, texture_h, 32,
 102       0x000000ff, 0x0000ff00, 0x00ff0000, 0xff000000);
 103 #endif
 104
 105   if(convert == 0)
 106     throw std::runtime_error("Couldn't create texture: out of memory");
 107
 108   SDL_SetAlpha(image, 0, 0);
 109   SDL_BlitSurface(image, 0, convert, 0);
 110
 111   ImageTexture* result = NULL;
 112   try {
 113     result = new ImageTexture(convert);
 114     result->filename = filename;
 115     result->image_width = image->w;
 116     result->image_height = image->h;
 117   } catch(...) {
 118     delete result;
 119     SDL_FreeSurface(convert);
 120     throw;
 121   }
 122
 123   SDL_FreeSurface(convert);
 124   return result;
 125 }
 126
 127 void
 128 TextureManager::save_textures()
 129 {
 130   glPixelStorei(GL_PACK_ROW_LENGTH, 0);
 131   glPixelStorei(GL_PACK_IMAGE_HEIGHT, 0);
 132   glPixelStorei(GL_PACK_SKIP_PIXELS, 0);
 133   glPixelStorei(GL_PACK_SKIP_ROWS, 0);
 134   glPixelStorei(GL_PACK_SKIP_IMAGES, 0);
 135   glPixelStorei(GL_PACK_ALIGNMENT, 1);
 136   for(Textures::iterator i = textures.begin(); i != textures.end(); ++i) {
 137     save_texture(*i);
 138   }
 139   for(ImageTextures::iterator i = image_textures.begin();
 140       i != image_textures.end(); ++i) {
 141     save_texture(i->second);
 142   }
 143 }
 144
 145 void
 146 TextureManager::save_texture(Texture* texture)
 147 {
 148   SavedTexture saved_texture;
 149   saved_texture.texture = texture;
 150   glBindTexture(GL_TEXTURE_2D, texture->get_handle());
 151   glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_WIDTH,
 152                            &saved_texture.width);
 153   glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_HEIGHT,
 154                            &saved_texture.height);
 155   glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_BORDER,
 156                            &saved_texture.border);
 157   glGetTexParameteriv(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
 158                       &saved_texture.min_filter);
 159   glGetTexParameteriv(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER,
 160                       &saved_texture.mag_filter);
 161   glGetTexParameteriv(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S,
 162                       &saved_texture.wrap_s);
 163   glGetTexParameteriv(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T,
 164                       &saved_texture.wrap_t);
 165
 166   size_t pixelssize = saved_texture.width * saved_texture.height * 4;
 167   saved_texture.pixels = new char[pixelssize];
 168
 169   glGetTexImage(GL_TEXTURE_2D, 0, GL_RGBA, GL_UNSIGNED_BYTE,
 170                 saved_texture.pixels);
 171
 172   saved_textures.push_back(saved_texture);
 173
 174   glDeleteTextures(1, &(texture->handle));
 175   texture->handle = 0;
 176
 177   assert_gl("retrieving texture");
 178 }
 179
 180 void
 181 TextureManager::reload_textures()
 182 {
 183   glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
 184   glPixelStorei(GL_UNPACK_IMAGE_HEIGHT, 0);
 185   glPixelStorei(GL_UNPACK_SKIP_PIXELS, 0);
 186   glPixelStorei(GL_UNPACK_SKIP_ROWS, 0);
 187   glPixelStorei(GL_UNPACK_SKIP_IMAGES, 0);
 188   glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
 189
 190   for(std::vector<SavedTexture>::iterator i = saved_textures.begin();
 191       i != saved_textures.end(); ++i) {
 192     SavedTexture& saved_texture = *i;
 193
 194     GLuint handle;
 195     glGenTextures(1, &handle);
 196     assert_gl("creating texture handle");
 197
 198     glBindTexture(GL_TEXTURE_2D, handle);
 199     glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA,
 200                  saved_texture.width, saved_texture.height,
 201                  saved_texture.border, GL_RGBA,
 202                  GL_UNSIGNED_BYTE, saved_texture.pixels);
 203     delete[] saved_texture.pixels;
 204     assert_gl("uploading texture pixel data");
 205
 206     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
 207                     saved_texture.min_filter);
 208     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER,
 209                     saved_texture.mag_filter);
 210     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S,
 211                     saved_texture.wrap_s);
 212     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T,
 213                     saved_texture.wrap_t);
 214
 215     assert_gl("setting texture_params");
 216     saved_texture.texture->handle = handle;
 217   }
 218
 219   saved_textures.clear();
 220 }
 221