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
  81         bool direct = ARB_texture_storage && ARB_direct_state_access;
  82         if(!direct)
  83         {
  84                 glActiveTexture(GL_TEXTURE0);
  85                 glBindTexture(target, id);
  86         }
  87
  88         allocate_(level);
  89
  90         if(!direct)
  91                 glBindTexture(target, 0);
  92 }
  93
  94 void TextureCube::allocate_(unsigned level)
  95 {
  96         if(allocated&(64<<level))
  97                 return;
  98
  99         if(ARB_texture_storage)
 100         {
 101                 GLenum fmt = get_gl_pixelformat(storage_fmt);
 102                 if(ARB_direct_state_access)
 103                         glTextureStorage2D(id, levels, fmt, size, size);
 104                 else
 105                         glTexStorage2D(target, levels, fmt, size, size);
 106                 apply_swizzle();
 107                 allocated |= (64<<levels)-1;
 108         }
 109         else
 110         {
 111                 for(unsigned i=0; i<6; ++i)
 112                         image_(enumerate_faces(i), level, 0);
 113         }
 114 }
 115
 116 void TextureCube::image(TextureCubeFace face, unsigned level, const void *data)
 117 {
 118         if(size==0)
 119                 throw invalid_operation("TextureCube::image");
 120         if(level>=levels)
 121                 throw out_of_range("TextureCube::image");
 122
 123         if(ARB_texture_storage)
 124         {
 125                 unsigned lsz = get_level_size(level);
 126                 return sub_image(face, level, 0, 0, lsz, lsz, data);
 127         }
 128
 129         glActiveTexture(GL_TEXTURE0);
 130         glBindTexture(target, id);
 131
 132         image_(face, level, data);
 133
 134         if(auto_gen_mipmap && level==0 && (allocated&63)==63)
 135         {
 136                 generate_mipmap_();
 137                 allocated |= (64<<levels)-1;
 138         }
 139
 140         glBindTexture(target, 0);
 141 }
 142
 143 void TextureCube::image_(TextureCubeFace face, unsigned level, const void *data)
 144 {
 145         if(!allocated)
 146         {
 147                 glTexParameteri(target, GL_TEXTURE_MAX_LEVEL, levels-1);
 148                 apply_swizzle();
 149         }
 150
 151         unsigned lsz = get_level_size(level);
 152         GLenum fmt = get_gl_pixelformat(storage_fmt);
 153         GLenum comp = get_gl_components(get_components(storage_fmt));
 154         GLenum type = get_gl_type(get_component_type(storage_fmt));
 155         glTexImage2D(face, level, fmt, lsz, lsz, 0, comp, type, data);
 156
 157         if(level==0)
 158         {
 159                 allocated |= 1<<get_face_index(face);
 160                 if((allocated&63)==63)
 161                         allocated |= 64;
 162         }
 163         else if(!(allocated&(64<<level)))
 164         {
 165                 for(unsigned i=0; i<6; ++i)
 166                         if(enumerate_faces(i)!=face)
 167                                 glTexImage2D(enumerate_faces(i), level, fmt, lsz, lsz, 0, comp, type, 0);
 168
 169                 allocated |= 64<<level;
 170         }
 171 }
 172
 173 void TextureCube::image(TextureCubeFace face, unsigned level, PixelComponents comp, DataType type, const void *data)
 174 {
 175         if(comp!=get_components(format) || type!=get_component_type(format))
 176                 throw incompatible_data("TextureCube::image");
 177         image(face, level, data);
 178 }
 179
 180 void TextureCube::sub_image(TextureCubeFace face, unsigned level, int x, int y, unsigned wd, unsigned ht, const void *data)
 181 {
 182         if(size==0)
 183                 throw invalid_operation("TextureCube::sub_image");
 184         if(level>=levels)
 185                 throw out_of_range("TextureCube::sub_image");
 186
 187         bool direct = (ARB_direct_state_access && (ARB_texture_storage || (allocated&(1<<level))));
 188         if(!direct)
 189         {
 190                 glActiveTexture(GL_TEXTURE0);
 191                 glBindTexture(target, id);
 192         }
 193
 194         allocate_(level);
 195
 196         GLenum comp = get_gl_components(get_components(storage_fmt));
 197         GLenum type = get_gl_type(get_component_type(storage_fmt));
 198         if(ARB_direct_state_access)
 199                 glTextureSubImage3D(id, level, x, y, get_face_index(face), wd, ht, 1, comp, type, data);
 200         else
 201                 glTexSubImage2D(face, level, x, y, wd, ht, comp, type, data);
 202
 203         if(auto_gen_mipmap && level==0)
 204                 generate_mipmap_();
 205
 206         if(!direct)
 207                 glBindTexture(target, 0);
 208 }
 209
 210 void TextureCube::sub_image(TextureCubeFace face, unsigned level, int x, int y, unsigned wd, unsigned ht, PixelComponents comp, DataType type, const void *data)
 211 {
 212         if(comp!=get_components(format) || type!=get_component_type(format))
 213                 throw incompatible_data("TextureCube::subimage");
 214         sub_image(face, level, x, y, wd, ht, data);
 215 }
 216
 217 void TextureCube::image(TextureCubeFace face, const Graphics::Image &img)
 218 {
 219         unsigned w = img.get_width();
 220         unsigned h = img.get_height();
 221         if(w!=h)
 222                 throw incompatible_data("TextureCube::image");
 223
 224         PixelFormat fmt = pixelformat_from_image(img);
 225         storage(make_pixelformat(get_components(fmt), get_component_type(fmt), use_srgb_format), w);
 226
 227         image(face, 0, img.get_pixels());
 228 }
 229
 230 void TextureCube::image(TextureCubeFace face, const Graphics::Image &img, bool)
 231 {
 232         image(face, img);
 233 }
 234
 235 void TextureCube::image(const Graphics::Image &img, unsigned lv)
 236 {
 237         unsigned w = img.get_width();
 238         unsigned h = img.get_height();
 239
 240         if(h!=w*6)
 241                 throw incompatible_data("TextureCube::image");
 242         h /= 6;
 243
 244         PixelFormat fmt = pixelformat_from_image(img);
 245         if(size==0)
 246                 storage(make_pixelformat(get_components(fmt), get_component_type(fmt), use_srgb_format), w, lv);
 247         else if(w!=size || h!=size)
 248                 throw incompatible_data("TextureCube::image");
 249
 250         const char *pixels = reinterpret_cast<const char *>(img.get_pixels());
 251         unsigned face_size = img.get_stride()*size;
 252         for(unsigned i=0; i<6; ++i)
 253                 image(enumerate_faces(i), 0, pixels+i*face_size);
 254 }
 255
 256 unsigned TextureCube::get_n_levels() const
 257 {
 258         unsigned n = 0;
 259         for(unsigned s=size; s; s>>=1, ++n) ;
 260         return n;
 261 }
 262
 263 unsigned TextureCube::get_level_size(unsigned level) const
 264 {
 265         return size>>level;
 266 }
 267
 268 TextureCubeFace TextureCube::enumerate_faces(unsigned i)
 269 {
 270         if(i>=6)
 271                 throw out_of_range("TextureCube::enumerate_faces");
 272         return face_order[i];
 273 }
 274
 275 unsigned TextureCube::get_face_index(TextureCubeFace face)
 276 {
 277         switch(face)
 278         {
 279         case POSITIVE_X: return 0;
 280         case NEGATIVE_X: return 1;
 281         case POSITIVE_Y: return 2;
 282         case NEGATIVE_Y: return 3;
 283         case POSITIVE_Z: return 4;
 284         case NEGATIVE_Z: return 5;
 285         default: throw invalid_argument("TextureCube::get_face_index");
 286         }
 287 }
 288
 289 const Vector3 &TextureCube::get_face_direction(TextureCubeFace face)
 290 {
 291         return directions[get_face_index(face)];
 292 }
 293
 294 const Vector3 &TextureCube::get_s_direction(TextureCubeFace face)
 295 {
 296         return directions[orientations[get_face_index(face)*2]];
 297 }
 298
 299 const Vector3 &TextureCube::get_t_direction(TextureCubeFace face)
 300 {
 301         return directions[orientations[get_face_index(face)*2+1]];
 302 }
 303
 304 Vector3 TextureCube::get_texel_direction(TextureCubeFace face, unsigned u, unsigned v)
 305 {
 306         float s = (u+0.5f)*2.0f/size-1.0f;
 307         float t = (v+0.5f)*2.0f/size-1.0f;
 308         const Vector3 &fv = get_face_direction(face);
 309         const Vector3 &sv = get_s_direction(face);
 310         const Vector3 &tv = get_t_direction(face);
 311         return fv+s*sv+t*tv;
 312 }
 313
 314 UInt64 TextureCube::get_data_size() const
 315 {
 316         return id ? size*size*6*get_pixel_size(storage_fmt) : 0;
 317 }
 318
 319
 320 TextureCube::Loader::Loader(TextureCube &t):
 321         DataFile::DerivedObjectLoader<TextureCube, Texture::Loader>(t)
 322 {
 323         init();
 324 }
 325
 326 TextureCube::Loader::Loader(TextureCube &t, Collection &c):
 327         DataFile::DerivedObjectLoader<TextureCube, Texture::Loader>(t, c)
 328 {
 329         init();
 330 }
 331
 332 void TextureCube::Loader::init()
 333 {
 334         add("external_image", &Loader::external_image);
 335         add("image_data", &Loader::image_data);
 336         add("raw_data", &Loader::raw_data);
 337         add("storage", &Loader::storage);
 338         add("storage", &Loader::storage_levels);
 339 }
 340
 341 void TextureCube::Loader::external_image(TextureCubeFace face, const string &fn)
 342 {
 343         Graphics::Image img;
 344         RefPtr<IO::Seekable> io = get_collection().open_raw(fn);
 345         img.load_io(*io);
 346
 347         obj.image(face, img);
 348 }
 349
 350 void TextureCube::Loader::image_data(TextureCubeFace face, const string &data)
 351 {
 352         Graphics::Image img;
 353         IO::Memory mem(data.data(), data.size());
 354         img.load_io(mem);
 355
 356         obj.image(face, img);
 357 }
 358
 359 void TextureCube::Loader::raw_data(TextureCubeFace face, const string &data)
 360 {
 361         obj.image(face, 0, data.data());
 362 }
 363
 364 void TextureCube::Loader::storage(PixelFormat fmt, unsigned s)
 365 {
 366         obj.storage(fmt, s);
 367 }
 368
 369 void TextureCube::Loader::storage_levels(PixelFormat fmt, unsigned s, unsigned l)
 370 {
 371         obj.storage(fmt, s, l);
 372 }
 373
 374
 375 void operator>>(const LexicalConverter &conv, TextureCubeFace &face)
 376 {
 377         const string &str = conv.get();
 378         if(str=="POSITIVE_X")
 379                 face = POSITIVE_X;
 380         else if(str=="NEGATIVE_X")
 381                 face = NEGATIVE_X;
 382         else if(str=="POSITIVE_Y")
 383                 face = POSITIVE_Y;
 384         else if(str=="NEGATIVE_Y")
 385                 face = NEGATIVE_Y;
 386         else if(str=="POSITIVE_Z")
 387                 face = POSITIVE_Z;
 388         else if(str=="NEGATIVE_Z")
 389                 face = NEGATIVE_Z;
 390         else
 391                 throw lexical_error(format("conversion of '%s' to TextureCubeFace", str));
 392 }
 393
 394 } // namespace GL
 395 } // namespace Msp