source/core/texturecube.cpp

   1 #include <msp/datafile/collection.h>
   2 #include <msp/gl/extensions/arb_seamless_cube_map.h>
   3 #include <msp/gl/extensions/arb_texture_cube_map.h>
   4 #include <msp/gl/extensions/arb_texture_storage.h>
   5 #include <msp/io/memory.h>
   6 #include <msp/strings/format.h>
   7 #include "bindable.h"
   8 #include "error.h"
   9 #include "pixelstore.h"
  10 #include "texturecube.h"
  11
  12 using namespace std;
  13
  14 namespace Msp {
  15 namespace GL {
  16
  17 TextureCubeFace TextureCube::face_order[6] =
  18 {
  19         POSITIVE_X,
  20         NEGATIVE_X,
  21         POSITIVE_Y,
  22         NEGATIVE_Y,
  23         POSITIVE_Z,
  24         NEGATIVE_Z
  25 };
  26
  27 Vector3 TextureCube::directions[6] =
  28 {
  29         Vector3(1, 0, 0),
  30         Vector3(-1, 0, 0),
  31         Vector3(0, 1, 0),
  32         Vector3(0, -1, 0),
  33         Vector3(0, 0, 1),
  34         Vector3(0, 0, -1)
  35 };
  36
  37 unsigned TextureCube::orientations[12] =
  38 {
  39         5, 3,
  40         4, 3,
  41         0, 4,
  42         0, 5,
  43         0, 3,
  44         1, 3
  45 };
  46
  47 TextureCube::TextureCube():
  48         Texture(GL_TEXTURE_CUBE_MAP),
  49         size(0),
  50         allocated(0)
  51 {
  52         static Require _req(ARB_texture_cube_map);
  53         if(ARB_seamless_cube_map)
  54                 glEnable(GL_TEXTURE_CUBE_MAP_SEAMLESS);
  55 }
  56
  57 void TextureCube::storage(PixelFormat fmt, unsigned sz, unsigned lv)
  58 {
  59         if(size>0)
  60         {
  61                 if(fmt!=format || sz!=size || (lv && lv!=levels))
  62                         throw incompatible_data("TextureCube::storage");
  63                 return;
  64         }
  65         if(sz==0)
  66                 throw invalid_argument("TextureCube::storage");
  67
  68         set_format(fmt);
  69         size = sz;
  70         levels = get_n_levels();
  71         if(lv>0)
  72                 levels = min(levels, lv);
  73 }
  74
  75 void TextureCube::allocate(unsigned level)
  76 {
  77         if(size==0)
  78                 throw invalid_operation("TextureCube::allocate");
  79         if(level>=levels)
  80                 throw invalid_argument("TextureCube::allocate");
  81         if(allocated&(64<<level))
  82                 return;
  83
  84         if(ARB_texture_storage)
  85         {
  86                 BindRestore _bind(this);
  87                 glTexStorage2D(target, levels, storage_fmt, size, size);
  88                 apply_swizzle();
  89                 allocated |= (64<<levels)-1;
  90         }
  91         else
  92         {
  93                 for(unsigned i=0; i<6; ++i)
  94                         image(enumerate_faces(i), level, 0);
  95         }
  96 }
  97
  98 void TextureCube::image(TextureCubeFace face, unsigned level, const void *data)
  99 {
 100         if(size==0)
 101                 throw invalid_operation("TextureCube::image");
 102
 103         unsigned s = get_level_size(level);
 104         if(s==0)
 105                 throw out_of_range("TextureCube::image");
 106
 107         if(ARB_texture_storage)
 108                 return sub_image(face, level, 0, 0, s, s, data);
 109
 110         BindRestore _bind(this);
 111
 112         if(!allocated)
 113         {
 114                 glTexParameteri(target, GL_TEXTURE_MAX_LEVEL, levels-1);
 115                 apply_swizzle();
 116         }
 117
 118         PixelComponents comp = get_components(storage_fmt);
 119         GLenum type = get_gl_type(get_component_type(storage_fmt));
 120         glTexImage2D(face, level, storage_fmt, s, s, 0, comp, type, data);
 121
 122         if(level==0)
 123         {
 124                 allocated |= 1<<get_face_index(face);
 125                 if((allocated&63)==63)
 126                 {
 127                         allocated |= 64;
 128                         if(auto_gen_mipmap)
 129                         {
 130                                 generate_mipmap();
 131                                 allocated |= (64<<levels)-1;
 132                         }
 133                 }
 134         }
 135         else if(!(allocated&(64<<level)))
 136         {
 137                 for(unsigned i=0; i<6; ++i)
 138                         if(enumerate_faces(i)!=face)
 139                                 glTexImage2D(enumerate_faces(i), level, storage_fmt, s, s, 0, comp, type, 0);
 140
 141                 allocated |= 64<<level;
 142         }
 143 }
 144
 145 void TextureCube::image(TextureCubeFace face, unsigned level, PixelComponents comp, DataType type, const void *data)
 146 {
 147         if(comp!=get_components(format) || type!=get_component_type(format))
 148                 throw incompatible_data("TextureCube::image");
 149         image(face, level, data);
 150 }
 151
 152 void TextureCube::sub_image(TextureCubeFace face, unsigned level, int x, int y, unsigned wd, unsigned ht, const void *data)
 153 {
 154         if(size==0)
 155                 throw invalid_operation("TextureCube::sub_image");
 156
 157         BindRestore _bind(this);
 158         allocate(level);
 159
 160         PixelComponents comp = get_components(storage_fmt);
 161         GLenum type = get_gl_type(get_component_type(storage_fmt));
 162         glTexSubImage2D(face, level, x, y, wd, ht, comp, type, data);
 163
 164         if(auto_gen_mipmap && level==0)
 165                 generate_mipmap();
 166 }
 167
 168 void TextureCube::sub_image(TextureCubeFace face, unsigned level, int x, int y, unsigned wd, unsigned ht, PixelComponents comp, DataType type, const void *data)
 169 {
 170         if(comp!=get_components(format) || type!=get_component_type(format))
 171                 throw incompatible_data("TextureCube::subimage");
 172         sub_image(face, level, x, y, wd, ht, data);
 173 }
 174
 175 void TextureCube::image(TextureCubeFace face, const Graphics::Image &img)
 176 {
 177         unsigned w = img.get_width();
 178         unsigned h = img.get_height();
 179         if(w!=h)
 180                 throw incompatible_data("TextureCube::image");
 181
 182         PixelFormat fmt = pixelformat_from_image(img);
 183         storage(make_pixelformat(get_components(fmt), get_component_type(fmt), use_srgb_format), w);
 184
 185         PixelStore pstore = PixelStore::from_image(img);
 186         BindRestore _bind_ps(pstore);
 187
 188         image(face, 0, img.get_pixels());
 189 }
 190
 191 void TextureCube::image(TextureCubeFace face, const Graphics::Image &img, bool)
 192 {
 193         image(face, img);
 194 }
 195
 196 void TextureCube::image(const Graphics::Image &img, unsigned lv)
 197 {
 198         unsigned w = img.get_width();
 199         unsigned h = img.get_height();
 200
 201         if(h!=w*6)
 202                 throw incompatible_data("TextureCube::image");
 203         h /= 6;
 204
 205         PixelFormat fmt = pixelformat_from_image(img);
 206         if(size==0)
 207                 storage(make_pixelformat(get_components(fmt), get_component_type(fmt), use_srgb_format), w, lv);
 208         else if(w!=size || h!=size)
 209                 throw incompatible_data("TextureCube::image");
 210
 211         PixelStore pstore = PixelStore::from_image(img);
 212         BindRestore _bind_ps(pstore);
 213
 214         const char *pixels = reinterpret_cast<const char *>(img.get_pixels());
 215         unsigned face_size = img.get_stride()*size;
 216         for(unsigned i=0; i<6; ++i)
 217                 image(enumerate_faces(i), 0, pixels+i*face_size);
 218 }
 219
 220 unsigned TextureCube::get_n_levels() const
 221 {
 222         unsigned n = 0;
 223         for(unsigned s=size; s; s>>=1, ++n) ;
 224         return n;
 225 }
 226
 227 unsigned TextureCube::get_level_size(unsigned level) const
 228 {
 229         return size>>level;
 230 }
 231
 232 TextureCubeFace TextureCube::enumerate_faces(unsigned i)
 233 {
 234         if(i>=6)
 235                 throw out_of_range("TextureCube::enumerate_faces");
 236         return face_order[i];
 237 }
 238
 239 unsigned TextureCube::get_face_index(TextureCubeFace face)
 240 {
 241         switch(face)
 242         {
 243         case POSITIVE_X: return 0;
 244         case NEGATIVE_X: return 1;
 245         case POSITIVE_Y: return 2;
 246         case NEGATIVE_Y: return 3;
 247         case POSITIVE_Z: return 4;
 248         case NEGATIVE_Z: return 5;
 249         default: throw invalid_argument("TextureCube::get_face_index");
 250         }
 251 }
 252
 253 const Vector3 &TextureCube::get_face_direction(TextureCubeFace face)
 254 {
 255         return directions[get_face_index(face)];
 256 }
 257
 258 const Vector3 &TextureCube::get_s_direction(TextureCubeFace face)
 259 {
 260         return directions[orientations[get_face_index(face)*2]];
 261 }
 262
 263 const Vector3 &TextureCube::get_t_direction(TextureCubeFace face)
 264 {
 265         return directions[orientations[get_face_index(face)*2+1]];
 266 }
 267
 268 Vector3 TextureCube::get_texel_direction(TextureCubeFace face, unsigned u, unsigned v)
 269 {
 270         float s = (u+0.5f)*2.0f/size-1.0f;
 271         float t = (v+0.5f)*2.0f/size-1.0f;
 272         const Vector3 &fv = get_face_direction(face);
 273         const Vector3 &sv = get_s_direction(face);
 274         const Vector3 &tv = get_t_direction(face);
 275         return fv+s*sv+t*tv;
 276 }
 277
 278 UInt64 TextureCube::get_data_size() const
 279 {
 280         return id ? size*size*6*get_pixel_size(storage_fmt) : 0;
 281 }
 282
 283
 284 TextureCube::Loader::Loader(TextureCube &t):
 285         DataFile::DerivedObjectLoader<TextureCube, Texture::Loader>(t)
 286 {
 287         init();
 288 }
 289
 290 TextureCube::Loader::Loader(TextureCube &t, Collection &c):
 291         DataFile::DerivedObjectLoader<TextureCube, Texture::Loader>(t, c)
 292 {
 293         init();
 294 }
 295
 296 void TextureCube::Loader::init()
 297 {
 298         add("external_image", &Loader::external_image);
 299         add("image_data", &Loader::image_data);
 300         add("raw_data", &Loader::raw_data);
 301         add("storage", &Loader::storage);
 302         add("storage", &Loader::storage_levels);
 303 }
 304
 305 void TextureCube::Loader::external_image(TextureCubeFace face, const string &fn)
 306 {
 307         Graphics::Image img;
 308         RefPtr<IO::Seekable> io = get_collection().open_raw(fn);
 309         img.load_io(*io);
 310
 311         obj.image(face, img);
 312 }
 313
 314 void TextureCube::Loader::image_data(TextureCubeFace face, const string &data)
 315 {
 316         Graphics::Image img;
 317         IO::Memory mem(data.data(), data.size());
 318         img.load_io(mem);
 319
 320         obj.image(face, img);
 321 }
 322
 323 void TextureCube::Loader::raw_data(TextureCubeFace face, const string &data)
 324 {
 325         obj.image(face, 0, data.data());
 326 }
 327
 328 void TextureCube::Loader::storage(PixelFormat fmt, unsigned s)
 329 {
 330         obj.storage(fmt, s);
 331 }
 332
 333 void TextureCube::Loader::storage_levels(PixelFormat fmt, unsigned s, unsigned l)
 334 {
 335         obj.storage(fmt, s, l);
 336 }
 337
 338
 339 void operator>>(const LexicalConverter &conv, TextureCubeFace &face)
 340 {
 341         const string &str = conv.get();
 342         if(str=="POSITIVE_X")
 343                 face = POSITIVE_X;
 344         else if(str=="NEGATIVE_X")
 345                 face = NEGATIVE_X;
 346         else if(str=="POSITIVE_Y")
 347                 face = POSITIVE_Y;
 348         else if(str=="NEGATIVE_Y")
 349                 face = NEGATIVE_Y;
 350         else if(str=="POSITIVE_Z")
 351                 face = POSITIVE_Z;
 352         else if(str=="NEGATIVE_Z")
 353                 face = NEGATIVE_Z;
 354         else
 355                 throw lexical_error(format("conversion of '%s' to TextureCubeFace", str));
 356 }
 357
 358 } // namespace GL
 359 } // namespace Msp