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                 GLenum fmt = get_gl_pixelformat(storage_fmt);
 101                 if(ARB_direct_state_access)
 102                         glTextureStorage2D(id, levels, fmt, size, size);
 103                 else
 104                         glTexStorage2D(target, levels, 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         GLenum fmt = get_gl_pixelformat(storage_fmt);
 152         GLenum comp = get_gl_components(get_components(storage_fmt));
 153         GLenum type = get_gl_type(get_component_type(storage_fmt));
 154         glTexImage2D(face, level, 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, 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         GLenum comp = get_gl_components(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         image(face, 0, img.get_pixels());
 227 }
 228
 229 void TextureCube::image(TextureCubeFace face, const Graphics::Image &img, bool)
 230 {
 231         image(face, img);
 232 }
 233
 234 void TextureCube::image(const Graphics::Image &img, unsigned lv)
 235 {
 236         unsigned w = img.get_width();
 237         unsigned h = img.get_height();
 238
 239         if(h!=w*6)
 240                 throw incompatible_data("TextureCube::image");
 241         h /= 6;
 242
 243         PixelFormat fmt = pixelformat_from_image(img);
 244         if(size==0)
 245                 storage(make_pixelformat(get_components(fmt), get_component_type(fmt), use_srgb_format), w, lv);
 246         else if(w!=size || h!=size)
 247                 throw incompatible_data("TextureCube::image");
 248
 249         const char *pixels = reinterpret_cast<const char *>(img.get_pixels());
 250         unsigned face_size = img.get_stride()*size;
 251         for(unsigned i=0; i<6; ++i)
 252                 image(enumerate_faces(i), 0, pixels+i*face_size);
 253 }
 254
 255 unsigned TextureCube::get_n_levels() const
 256 {
 257         unsigned n = 0;
 258         for(unsigned s=size; s; s>>=1, ++n) ;
 259         return n;
 260 }
 261
 262 unsigned TextureCube::get_level_size(unsigned level) const
 263 {
 264         return size>>level;
 265 }
 266
 267 TextureCubeFace TextureCube::enumerate_faces(unsigned i)
 268 {
 269         if(i>=6)
 270                 throw out_of_range("TextureCube::enumerate_faces");
 271         return face_order[i];
 272 }
 273
 274 unsigned TextureCube::get_face_index(TextureCubeFace face)
 275 {
 276         switch(face)
 277         {
 278         case POSITIVE_X: return 0;
 279         case NEGATIVE_X: return 1;
 280         case POSITIVE_Y: return 2;
 281         case NEGATIVE_Y: return 3;
 282         case POSITIVE_Z: return 4;
 283         case NEGATIVE_Z: return 5;
 284         default: throw invalid_argument("TextureCube::get_face_index");
 285         }
 286 }
 287
 288 const Vector3 &TextureCube::get_face_direction(TextureCubeFace face)
 289 {
 290         return directions[get_face_index(face)];
 291 }
 292
 293 const Vector3 &TextureCube::get_s_direction(TextureCubeFace face)
 294 {
 295         return directions[orientations[get_face_index(face)*2]];
 296 }
 297
 298 const Vector3 &TextureCube::get_t_direction(TextureCubeFace face)
 299 {
 300         return directions[orientations[get_face_index(face)*2+1]];
 301 }
 302
 303 Vector3 TextureCube::get_texel_direction(TextureCubeFace face, unsigned u, unsigned v)
 304 {
 305         float s = (u+0.5f)*2.0f/size-1.0f;
 306         float t = (v+0.5f)*2.0f/size-1.0f;
 307         const Vector3 &fv = get_face_direction(face);
 308         const Vector3 &sv = get_s_direction(face);
 309         const Vector3 &tv = get_t_direction(face);
 310         return fv+s*sv+t*tv;
 311 }
 312
 313 UInt64 TextureCube::get_data_size() const
 314 {
 315         return id ? size*size*6*get_pixel_size(storage_fmt) : 0;
 316 }
 317
 318
 319 TextureCube::Loader::Loader(TextureCube &t):
 320         DataFile::DerivedObjectLoader<TextureCube, Texture::Loader>(t)
 321 {
 322         init();
 323 }
 324
 325 TextureCube::Loader::Loader(TextureCube &t, Collection &c):
 326         DataFile::DerivedObjectLoader<TextureCube, Texture::Loader>(t, c)
 327 {
 328         init();
 329 }
 330
 331 void TextureCube::Loader::init()
 332 {
 333         add("external_image", &Loader::external_image);
 334         add("image_data", &Loader::image_data);
 335         add("raw_data", &Loader::raw_data);
 336         add("storage", &Loader::storage);
 337         add("storage", &Loader::storage_levels);
 338 }
 339
 340 void TextureCube::Loader::external_image(TextureCubeFace face, const string &fn)
 341 {
 342         Graphics::Image img;
 343         RefPtr<IO::Seekable> io = get_collection().open_raw(fn);
 344         img.load_io(*io);
 345
 346         obj.image(face, img);
 347 }
 348
 349 void TextureCube::Loader::image_data(TextureCubeFace face, const string &data)
 350 {
 351         Graphics::Image img;
 352         IO::Memory mem(data.data(), data.size());
 353         img.load_io(mem);
 354
 355         obj.image(face, img);
 356 }
 357
 358 void TextureCube::Loader::raw_data(TextureCubeFace face, const string &data)
 359 {
 360         obj.image(face, 0, data.data());
 361 }
 362
 363 void TextureCube::Loader::storage(PixelFormat fmt, unsigned s)
 364 {
 365         obj.storage(fmt, s);
 366 }
 367
 368 void TextureCube::Loader::storage_levels(PixelFormat fmt, unsigned s, unsigned l)
 369 {
 370         obj.storage(fmt, s, l);
 371 }
 372
 373
 374 void operator>>(const LexicalConverter &conv, TextureCubeFace &face)
 375 {
 376         const string &str = conv.get();
 377         if(str=="POSITIVE_X")
 378                 face = POSITIVE_X;
 379         else if(str=="NEGATIVE_X")
 380                 face = NEGATIVE_X;
 381         else if(str=="POSITIVE_Y")
 382                 face = POSITIVE_Y;
 383         else if(str=="NEGATIVE_Y")
 384                 face = NEGATIVE_Y;
 385         else if(str=="POSITIVE_Z")
 386                 face = POSITIVE_Z;
 387         else if(str=="NEGATIVE_Z")
 388                 face = NEGATIVE_Z;
 389         else
 390                 throw lexical_error(format("conversion of '%s' to TextureCubeFace", str));
 391 }
 392
 393 } // namespace GL
 394 } // namespace Msp