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