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