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