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