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 "bindable.h"
   9 #include "error.h"
  10 #include "pixelstore.h"
  11 #include "texturecube.h"
  12
  13 using namespace std;
  14
  15 namespace Msp {
  16 namespace GL {
  17
  18 TextureCubeFace TextureCube::face_order[6] =
  19 {
  20         POSITIVE_X,
  21         NEGATIVE_X,
  22         POSITIVE_Y,
  23         NEGATIVE_Y,
  24         POSITIVE_Z,
  25         NEGATIVE_Z
  26 };
  27
  28 Vector3 TextureCube::directions[6] =
  29 {
  30         Vector3(1, 0, 0),
  31         Vector3(-1, 0, 0),
  32         Vector3(0, 1, 0),
  33         Vector3(0, -1, 0),
  34         Vector3(0, 0, 1),
  35         Vector3(0, 0, -1)
  36 };
  37
  38 unsigned TextureCube::orientations[12] =
  39 {
  40         5, 3,
  41         4, 3,
  42         0, 4,
  43         0, 5,
  44         0, 3,
  45         1, 3
  46 };
  47
  48 TextureCube::TextureCube():
  49         Texture(GL_TEXTURE_CUBE_MAP),
  50         size(0),
  51         allocated(0)
  52 {
  53         static Require _req(ARB_texture_cube_map);
  54         if(ARB_seamless_cube_map)
  55                 glEnable(GL_TEXTURE_CUBE_MAP_SEAMLESS);
  56 }
  57
  58 void TextureCube::storage(PixelFormat fmt, unsigned sz, unsigned lv)
  59 {
  60         if(size>0)
  61         {
  62                 if(fmt!=format || sz!=size || (lv && lv!=levels))
  63                         throw incompatible_data("TextureCube::storage");
  64                 return;
  65         }
  66         if(sz==0)
  67                 throw invalid_argument("TextureCube::storage");
  68
  69         set_format(fmt);
  70         size = sz;
  71         levels = get_n_levels();
  72         if(lv>0)
  73                 levels = min(levels, lv);
  74 }
  75
  76 void TextureCube::allocate(unsigned level)
  77 {
  78         if(size==0)
  79                 throw invalid_operation("TextureCube::allocate");
  80         if(level>=levels)
  81                 throw invalid_argument("TextureCube::allocate");
  82         if(allocated&(64<<level))
  83                 return;
  84
  85         bool direct = ARB_texture_storage && ARB_direct_state_access;
  86         if(!direct)
  87         {
  88                 glActiveTexture(GL_TEXTURE0);
  89                 glBindTexture(target, id);
  90         }
  91
  92         allocate_(level);
  93
  94         if(!direct)
  95                 glBindTexture(target, 0);
  96 }
  97
  98 void TextureCube::allocate_(unsigned level)
  99 {
 100         if(ARB_texture_storage)
 101         {
 102                 if(ARB_direct_state_access)
 103                         glTextureStorage2D(id, levels, storage_fmt, size, size);
 104                 else
 105                         glTexStorage2D(target, levels, storage_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         PixelComponents comp = get_components(storage_fmt);
 153         GLenum type = get_gl_type(get_component_type(storage_fmt));
 154         glTexImage2D(face, level, storage_fmt, lsz, lsz, 0, comp, type, data);
 155
 156         if(level==0)
 157         {
 158                 allocated |= 1<<get_face_index(face);
 159                 if((allocated&63)==63)
 160                         allocated |= 64;
 161         }
 162         else if(!(allocated&(64<<level)))
 163         {
 164                 for(unsigned i=0; i<6; ++i)
 165                         if(enumerate_faces(i)!=face)
 166                                 glTexImage2D(enumerate_faces(i), level, storage_fmt, lsz, lsz, 0, comp, type, 0);
 167
 168                 allocated |= 64<<level;
 169         }
 170 }
 171
 172 void TextureCube::image(TextureCubeFace face, unsigned level, PixelComponents comp, DataType type, const void *data)
 173 {
 174         if(comp!=get_components(format) || type!=get_component_type(format))
 175                 throw incompatible_data("TextureCube::image");
 176         image(face, level, data);
 177 }
 178
 179 void TextureCube::sub_image(TextureCubeFace face, unsigned level, int x, int y, unsigned wd, unsigned ht, const void *data)
 180 {
 181         if(size==0)
 182                 throw invalid_operation("TextureCube::sub_image");
 183         if(level>=levels)
 184                 throw out_of_range("TextureCube::sub_image");
 185
 186         bool direct = (ARB_direct_state_access && (ARB_texture_storage || (allocated&(1<<level))));
 187         if(!direct)
 188         {
 189                 glActiveTexture(GL_TEXTURE0);
 190                 glBindTexture(target, id);
 191         }
 192
 193         allocate_(level);
 194
 195         PixelComponents comp = get_components(storage_fmt);
 196         GLenum type = get_gl_type(get_component_type(storage_fmt));
 197         if(ARB_direct_state_access)
 198                 glTextureSubImage3D(id, level, x, y, get_face_index(face), wd, ht, 1, comp, type, data);
 199         else
 200                 glTexSubImage2D(face, level, x, y, wd, ht, comp, type, data);
 201
 202         if(auto_gen_mipmap && level==0)
 203                 generate_mipmap_();
 204
 205         if(!direct)
 206                 glBindTexture(target, 0);
 207 }
 208
 209 void TextureCube::sub_image(TextureCubeFace face, unsigned level, int x, int y, unsigned wd, unsigned ht, PixelComponents comp, DataType type, const void *data)
 210 {
 211         if(comp!=get_components(format) || type!=get_component_type(format))
 212                 throw incompatible_data("TextureCube::subimage");
 213         sub_image(face, level, x, y, wd, ht, data);
 214 }
 215
 216 void TextureCube::image(TextureCubeFace face, const Graphics::Image &img)
 217 {
 218         unsigned w = img.get_width();
 219         unsigned h = img.get_height();
 220         if(w!=h)
 221                 throw incompatible_data("TextureCube::image");
 222
 223         PixelFormat fmt = pixelformat_from_image(img);
 224         storage(make_pixelformat(get_components(fmt), get_component_type(fmt), use_srgb_format), w);
 225
 226         PixelStore pstore = PixelStore::from_image(img);
 227         BindRestore _bind_ps(pstore);
 228
 229         image(face, 0, img.get_pixels());
 230 }
 231
 232 void TextureCube::image(TextureCubeFace face, const Graphics::Image &img, bool)
 233 {
 234         image(face, img);
 235 }
 236
 237 void TextureCube::image(const Graphics::Image &img, unsigned lv)
 238 {
 239         unsigned w = img.get_width();
 240         unsigned h = img.get_height();
 241
 242         if(h!=w*6)
 243                 throw incompatible_data("TextureCube::image");
 244         h /= 6;
 245
 246         PixelFormat fmt = pixelformat_from_image(img);
 247         if(size==0)
 248                 storage(make_pixelformat(get_components(fmt), get_component_type(fmt), use_srgb_format), w, lv);
 249         else if(w!=size || h!=size)
 250                 throw incompatible_data("TextureCube::image");
 251
 252         PixelStore pstore = PixelStore::from_image(img);
 253         BindRestore _bind_ps(pstore);
 254
 255         const char *pixels = reinterpret_cast<const char *>(img.get_pixels());
 256         unsigned face_size = img.get_stride()*size;
 257         for(unsigned i=0; i<6; ++i)
 258                 image(enumerate_faces(i), 0, pixels+i*face_size);
 259 }
 260
 261 unsigned TextureCube::get_n_levels() const
 262 {
 263         unsigned n = 0;
 264         for(unsigned s=size; s; s>>=1, ++n) ;
 265         return n;
 266 }
 267
 268 unsigned TextureCube::get_level_size(unsigned level) const
 269 {
 270         return size>>level;
 271 }
 272
 273 TextureCubeFace TextureCube::enumerate_faces(unsigned i)
 274 {
 275         if(i>=6)
 276                 throw out_of_range("TextureCube::enumerate_faces");
 277         return face_order[i];
 278 }
 279
 280 unsigned TextureCube::get_face_index(TextureCubeFace face)
 281 {
 282         switch(face)
 283         {
 284         case POSITIVE_X: return 0;
 285         case NEGATIVE_X: return 1;
 286         case POSITIVE_Y: return 2;
 287         case NEGATIVE_Y: return 3;
 288         case POSITIVE_Z: return 4;
 289         case NEGATIVE_Z: return 5;
 290         default: throw invalid_argument("TextureCube::get_face_index");
 291         }
 292 }
 293
 294 const Vector3 &TextureCube::get_face_direction(TextureCubeFace face)
 295 {
 296         return directions[get_face_index(face)];
 297 }
 298
 299 const Vector3 &TextureCube::get_s_direction(TextureCubeFace face)
 300 {
 301         return directions[orientations[get_face_index(face)*2]];
 302 }
 303
 304 const Vector3 &TextureCube::get_t_direction(TextureCubeFace face)
 305 {
 306         return directions[orientations[get_face_index(face)*2+1]];
 307 }
 308
 309 Vector3 TextureCube::get_texel_direction(TextureCubeFace face, unsigned u, unsigned v)
 310 {
 311         float s = (u+0.5f)*2.0f/size-1.0f;
 312         float t = (v+0.5f)*2.0f/size-1.0f;
 313         const Vector3 &fv = get_face_direction(face);
 314         const Vector3 &sv = get_s_direction(face);
 315         const Vector3 &tv = get_t_direction(face);
 316         return fv+s*sv+t*tv;
 317 }
 318
 319 UInt64 TextureCube::get_data_size() const
 320 {
 321         return id ? size*size*6*get_pixel_size(storage_fmt) : 0;
 322 }
 323
 324
 325 TextureCube::Loader::Loader(TextureCube &t):
 326         DataFile::DerivedObjectLoader<TextureCube, Texture::Loader>(t)
 327 {
 328         init();
 329 }
 330
 331 TextureCube::Loader::Loader(TextureCube &t, Collection &c):
 332         DataFile::DerivedObjectLoader<TextureCube, Texture::Loader>(t, c)
 333 {
 334         init();
 335 }
 336
 337 void TextureCube::Loader::init()
 338 {
 339         add("external_image", &Loader::external_image);
 340         add("image_data", &Loader::image_data);
 341         add("raw_data", &Loader::raw_data);
 342         add("storage", &Loader::storage);
 343         add("storage", &Loader::storage_levels);
 344 }
 345
 346 void TextureCube::Loader::external_image(TextureCubeFace face, const string &fn)
 347 {
 348         Graphics::Image img;
 349         RefPtr<IO::Seekable> io = get_collection().open_raw(fn);
 350         img.load_io(*io);
 351
 352         obj.image(face, img);
 353 }
 354
 355 void TextureCube::Loader::image_data(TextureCubeFace face, const string &data)
 356 {
 357         Graphics::Image img;
 358         IO::Memory mem(data.data(), data.size());
 359         img.load_io(mem);
 360
 361         obj.image(face, img);
 362 }
 363
 364 void TextureCube::Loader::raw_data(TextureCubeFace face, const string &data)
 365 {
 366         obj.image(face, 0, data.data());
 367 }
 368
 369 void TextureCube::Loader::storage(PixelFormat fmt, unsigned s)
 370 {
 371         obj.storage(fmt, s);
 372 }
 373
 374 void TextureCube::Loader::storage_levels(PixelFormat fmt, unsigned s, unsigned l)
 375 {
 376         obj.storage(fmt, s, l);
 377 }
 378
 379
 380 void operator>>(const LexicalConverter &conv, TextureCubeFace &face)
 381 {
 382         const string &str = conv.get();
 383         if(str=="POSITIVE_X")
 384                 face = POSITIVE_X;
 385         else if(str=="NEGATIVE_X")
 386                 face = NEGATIVE_X;
 387         else if(str=="POSITIVE_Y")
 388                 face = POSITIVE_Y;
 389         else if(str=="NEGATIVE_Y")
 390                 face = NEGATIVE_Y;
 391         else if(str=="POSITIVE_Z")
 392                 face = POSITIVE_Z;
 393         else if(str=="NEGATIVE_Z")
 394                 face = NEGATIVE_Z;
 395         else
 396                 throw lexical_error(format("conversion of '%s' to TextureCubeFace", str));
 397 }
 398
 399 } // namespace GL
 400 } // namespace Msp