source/core/texturecube.cpp

   1 #include <msp/datafile/collection.h>
   2 #include <msp/gl/extensions/arb_direct_state_access.h>
   3 #include <msp/gl/extensions/arb_seamless_cube_map.h>
   4 #include <msp/gl/extensions/arb_texture_cube_map.h>
   5 #include <msp/gl/extensions/arb_texture_storage.h>
   6 #include <msp/io/memory.h>
   7 #include <msp/strings/format.h>
   8 #include "error.h"
   9 #include "texturecube.h"
  10
  11 using namespace std;
  12
  13 namespace Msp {
  14 namespace GL {
  15
  16 TextureCubeFace TextureCube::face_order[6] =
  17 {
  18         POSITIVE_X,
  19         NEGATIVE_X,
  20         POSITIVE_Y,
  21         NEGATIVE_Y,
  22         POSITIVE_Z,
  23         NEGATIVE_Z
  24 };
  25
  26 Vector3 TextureCube::directions[6] =
  27 {
  28         Vector3(1, 0, 0),
  29         Vector3(-1, 0, 0),
  30         Vector3(0, 1, 0),
  31         Vector3(0, -1, 0),
  32         Vector3(0, 0, 1),
  33         Vector3(0, 0, -1)
  34 };
  35
  36 unsigned TextureCube::orientations[12] =
  37 {
  38         5, 3,
  39         4, 3,
  40         0, 4,
  41         0, 5,
  42         0, 3,
  43         1, 3
  44 };
  45
  46 TextureCube::TextureCube():
  47         Texture(GL_TEXTURE_CUBE_MAP),
  48         size(0),
  49         allocated(0)
  50 {
  51         static Require _req(ARB_texture_cube_map);
  52         if(ARB_seamless_cube_map)
  53                 glEnable(GL_TEXTURE_CUBE_MAP_SEAMLESS);
  54 }
  55
  56 void TextureCube::storage(PixelFormat fmt, unsigned sz, unsigned lv)
  57 {
  58         if(size>0)
  59         {
  60                 if(fmt!=format || sz!=size || (lv && lv!=levels))
  61                         throw incompatible_data("TextureCube::storage");
  62                 return;
  63         }
  64         if(sz==0)
  65                 throw invalid_argument("TextureCube::storage");
  66
  67         set_format(fmt);
  68         size = sz;
  69         levels = get_n_levels();
  70         if(lv>0)
  71                 levels = min(levels, lv);
  72 }
  73
  74 void TextureCube::allocate(unsigned level)
  75 {
  76         if(size==0)
  77                 throw invalid_operation("TextureCube::allocate");
  78         if(level>=levels)
  79                 throw invalid_argument("TextureCube::allocate");
  80         if(allocated&(64<<level))
  81                 return;
  82
  83         bool direct = ARB_texture_storage && ARB_direct_state_access;
  84         if(!direct)
  85         {
  86                 glActiveTexture(GL_TEXTURE0);
  87                 glBindTexture(target, id);
  88         }
  89
  90         allocate_(level);
  91
  92         if(!direct)
  93                 glBindTexture(target, 0);
  94 }
  95
  96 void TextureCube::allocate_(unsigned level)
  97 {
  98         if(ARB_texture_storage)
  99         {
 100                 if(ARB_direct_state_access)
 101                         glTextureStorage2D(id, levels, storage_fmt, size, size);
 102                 else
 103                         glTexStorage2D(target, levels, storage_fmt, size, size);
 104                 apply_swizzle();
 105                 allocated |= (64<<levels)-1;
 106         }
 107         else
 108         {
 109                 for(unsigned i=0; i<6; ++i)
 110                         image_(enumerate_faces(i), level, 0);
 111         }
 112 }
 113
 114 void TextureCube::image(TextureCubeFace face, unsigned level, const void *data)
 115 {
 116         if(size==0)
 117                 throw invalid_operation("TextureCube::image");
 118         if(level>=levels)
 119                 throw out_of_range("TextureCube::image");
 120
 121         if(ARB_texture_storage)
 122         {
 123                 unsigned lsz = get_level_size(level);
 124                 return sub_image(face, level, 0, 0, lsz, lsz, data);
 125         }
 126
 127         glActiveTexture(GL_TEXTURE0);
 128         glBindTexture(target, id);
 129
 130         image_(face, level, data);
 131
 132         if(auto_gen_mipmap && level==0 && (allocated&63)==63)
 133         {
 134                 generate_mipmap_();
 135                 allocated |= (64<<levels)-1;
 136         }
 137
 138         glBindTexture(target, 0);
 139 }
 140
 141 void TextureCube::image_(TextureCubeFace face, unsigned level, const void *data)
 142 {
 143         if(!allocated)
 144         {
 145                 glTexParameteri(target, GL_TEXTURE_MAX_LEVEL, levels-1);
 146                 apply_swizzle();
 147         }
 148
 149         unsigned lsz = get_level_size(level);
 150         PixelComponents comp = get_components(storage_fmt);
 151         GLenum type = get_gl_type(get_component_type(storage_fmt));
 152         glTexImage2D(face, level, storage_fmt, lsz, lsz, 0, comp, type, data);
 153
 154         if(level==0)
 155         {
 156                 allocated |= 1<<get_face_index(face);
 157                 if((allocated&63)==63)
 158                         allocated |= 64;
 159         }
 160         else if(!(allocated&(64<<level)))
 161         {
 162                 for(unsigned i=0; i<6; ++i)
 163                         if(enumerate_faces(i)!=face)
 164                                 glTexImage2D(enumerate_faces(i), level, storage_fmt, lsz, lsz, 0, comp, type, 0);
 165
 166                 allocated |= 64<<level;
 167         }
 168 }
 169
 170 void TextureCube::image(TextureCubeFace face, unsigned level, PixelComponents comp, DataType type, const void *data)
 171 {
 172         if(comp!=get_components(format) || type!=get_component_type(format))
 173                 throw incompatible_data("TextureCube::image");
 174         image(face, level, data);
 175 }
 176
 177 void TextureCube::sub_image(TextureCubeFace face, unsigned level, int x, int y, unsigned wd, unsigned ht, const void *data)
 178 {
 179         if(size==0)
 180                 throw invalid_operation("TextureCube::sub_image");
 181         if(level>=levels)
 182                 throw out_of_range("TextureCube::sub_image");
 183
 184         bool direct = (ARB_direct_state_access && (ARB_texture_storage || (allocated&(1<<level))));
 185         if(!direct)
 186         {
 187                 glActiveTexture(GL_TEXTURE0);
 188                 glBindTexture(target, id);
 189         }
 190
 191         allocate_(level);
 192
 193         PixelComponents comp = get_components(storage_fmt);
 194         GLenum type = get_gl_type(get_component_type(storage_fmt));
 195         if(ARB_direct_state_access)
 196                 glTextureSubImage3D(id, level, x, y, get_face_index(face), wd, ht, 1, comp, type, data);
 197         else
 198                 glTexSubImage2D(face, level, x, y, wd, ht, comp, type, data);
 199
 200         if(auto_gen_mipmap && level==0)
 201                 generate_mipmap_();
 202
 203         if(!direct)
 204                 glBindTexture(target, 0);
 205 }
 206
 207 void TextureCube::sub_image(TextureCubeFace face, unsigned level, int x, int y, unsigned wd, unsigned ht, PixelComponents comp, DataType type, const void *data)
 208 {
 209         if(comp!=get_components(format) || type!=get_component_type(format))
 210                 throw incompatible_data("TextureCube::subimage");
 211         sub_image(face, level, x, y, wd, ht, data);
 212 }
 213
 214 void TextureCube::image(TextureCubeFace face, const Graphics::Image &img)
 215 {
 216         unsigned w = img.get_width();
 217         unsigned h = img.get_height();
 218         if(w!=h)
 219                 throw incompatible_data("TextureCube::image");
 220
 221         PixelFormat fmt = pixelformat_from_image(img);
 222         storage(make_pixelformat(get_components(fmt), get_component_type(fmt), use_srgb_format), w);
 223
 224         image(face, 0, img.get_pixels());
 225 }
 226
 227 void TextureCube::image(TextureCubeFace face, const Graphics::Image &img, bool)
 228 {
 229         image(face, img);
 230 }
 231
 232 void TextureCube::image(const Graphics::Image &img, unsigned lv)
 233 {
 234         unsigned w = img.get_width();
 235         unsigned h = img.get_height();
 236
 237         if(h!=w*6)
 238                 throw incompatible_data("TextureCube::image");
 239         h /= 6;
 240
 241         PixelFormat fmt = pixelformat_from_image(img);
 242         if(size==0)
 243                 storage(make_pixelformat(get_components(fmt), get_component_type(fmt), use_srgb_format), w, lv);
 244         else if(w!=size || h!=size)
 245                 throw incompatible_data("TextureCube::image");
 246
 247         const char *pixels = reinterpret_cast<const char *>(img.get_pixels());
 248         unsigned face_size = img.get_stride()*size;
 249         for(unsigned i=0; i<6; ++i)
 250                 image(enumerate_faces(i), 0, pixels+i*face_size);
 251 }
 252
 253 unsigned TextureCube::get_n_levels() const
 254 {
 255         unsigned n = 0;
 256         for(unsigned s=size; s; s>>=1, ++n) ;
 257         return n;
 258 }
 259
 260 unsigned TextureCube::get_level_size(unsigned level) const
 261 {
 262         return size>>level;
 263 }
 264
 265 TextureCubeFace TextureCube::enumerate_faces(unsigned i)
 266 {
 267         if(i>=6)
 268                 throw out_of_range("TextureCube::enumerate_faces");
 269         return face_order[i];
 270 }
 271
 272 unsigned TextureCube::get_face_index(TextureCubeFace face)
 273 {
 274         switch(face)
 275         {
 276         case POSITIVE_X: return 0;
 277         case NEGATIVE_X: return 1;
 278         case POSITIVE_Y: return 2;
 279         case NEGATIVE_Y: return 3;
 280         case POSITIVE_Z: return 4;
 281         case NEGATIVE_Z: return 5;
 282         default: throw invalid_argument("TextureCube::get_face_index");
 283         }
 284 }
 285
 286 const Vector3 &TextureCube::get_face_direction(TextureCubeFace face)
 287 {
 288         return directions[get_face_index(face)];
 289 }
 290
 291 const Vector3 &TextureCube::get_s_direction(TextureCubeFace face)
 292 {
 293         return directions[orientations[get_face_index(face)*2]];
 294 }
 295
 296 const Vector3 &TextureCube::get_t_direction(TextureCubeFace face)
 297 {
 298         return directions[orientations[get_face_index(face)*2+1]];
 299 }
 300
 301 Vector3 TextureCube::get_texel_direction(TextureCubeFace face, unsigned u, unsigned v)
 302 {
 303         float s = (u+0.5f)*2.0f/size-1.0f;
 304         float t = (v+0.5f)*2.0f/size-1.0f;
 305         const Vector3 &fv = get_face_direction(face);
 306         const Vector3 &sv = get_s_direction(face);
 307         const Vector3 &tv = get_t_direction(face);
 308         return fv+s*sv+t*tv;
 309 }
 310
 311 UInt64 TextureCube::get_data_size() const
 312 {
 313         return id ? size*size*6*get_pixel_size(storage_fmt) : 0;
 314 }
 315
 316
 317 TextureCube::Loader::Loader(TextureCube &t):
 318         DataFile::DerivedObjectLoader<TextureCube, Texture::Loader>(t)
 319 {
 320         init();
 321 }
 322
 323 TextureCube::Loader::Loader(TextureCube &t, Collection &c):
 324         DataFile::DerivedObjectLoader<TextureCube, Texture::Loader>(t, c)
 325 {
 326         init();
 327 }
 328
 329 void TextureCube::Loader::init()
 330 {
 331         add("external_image", &Loader::external_image);
 332         add("image_data", &Loader::image_data);
 333         add("raw_data", &Loader::raw_data);
 334         add("storage", &Loader::storage);
 335         add("storage", &Loader::storage_levels);
 336 }
 337
 338 void TextureCube::Loader::external_image(TextureCubeFace face, const string &fn)
 339 {
 340         Graphics::Image img;
 341         RefPtr<IO::Seekable> io = get_collection().open_raw(fn);
 342         img.load_io(*io);
 343
 344         obj.image(face, img);
 345 }
 346
 347 void TextureCube::Loader::image_data(TextureCubeFace face, const string &data)
 348 {
 349         Graphics::Image img;
 350         IO::Memory mem(data.data(), data.size());
 351         img.load_io(mem);
 352
 353         obj.image(face, img);
 354 }
 355
 356 void TextureCube::Loader::raw_data(TextureCubeFace face, const string &data)
 357 {
 358         obj.image(face, 0, data.data());
 359 }
 360
 361 void TextureCube::Loader::storage(PixelFormat fmt, unsigned s)
 362 {
 363         obj.storage(fmt, s);
 364 }
 365
 366 void TextureCube::Loader::storage_levels(PixelFormat fmt, unsigned s, unsigned l)
 367 {
 368         obj.storage(fmt, s, l);
 369 }
 370
 371
 372 void operator>>(const LexicalConverter &conv, TextureCubeFace &face)
 373 {
 374         const string &str = conv.get();
 375         if(str=="POSITIVE_X")
 376                 face = POSITIVE_X;
 377         else if(str=="NEGATIVE_X")
 378                 face = NEGATIVE_X;
 379         else if(str=="POSITIVE_Y")
 380                 face = POSITIVE_Y;
 381         else if(str=="NEGATIVE_Y")
 382                 face = NEGATIVE_Y;
 383         else if(str=="POSITIVE_Z")
 384                 face = POSITIVE_Z;
 385         else if(str=="NEGATIVE_Z")
 386                 face = NEGATIVE_Z;
 387         else
 388                 throw lexical_error(format("conversion of '%s' to TextureCubeFace", str));
 389 }
 390
 391 } // namespace GL
 392 } // namespace Msp