source/texturecube.cpp

   1 #include <msp/datafile/collection.h>
   2 #include <msp/gl/extensions/arb_texture_cube_map.h>
   3 #include <msp/gl/extensions/arb_texture_storage.h>
   4 #include <msp/io/memory.h>
   5 #include <msp/strings/format.h>
   6 #include "bindable.h"
   7 #include "error.h"
   8 #include "pixelstore.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 }
  53
  54 void TextureCube::storage(PixelFormat fmt, unsigned sz, unsigned lv)
  55 {
  56         if(size>0)
  57                 throw invalid_operation("TextureCube::storage");
  58         if(sz==0)
  59                 throw invalid_argument("TextureCube::storage");
  60
  61         set_format(fmt);
  62         size = sz;
  63         levels = get_n_levels();
  64         if(lv>0)
  65                 levels = min(levels, lv);
  66 }
  67
  68 void TextureCube::allocate(unsigned level)
  69 {
  70         if(size==0)
  71                 throw invalid_operation("TextureCube::allocate");
  72         if(level>=levels)
  73                 throw invalid_argument("TextureCube::allocate");
  74         if(allocated&(64<<level))
  75                 return;
  76
  77         if(ARB_texture_storage)
  78         {
  79                 BindRestore _bind(this);
  80                 glTexStorage2D(target, levels, storage_fmt, size, size);
  81                 apply_swizzle();
  82                 allocated |= (1<<levels)-1;
  83         }
  84         else
  85         {
  86                 for(unsigned i=0; i<6; ++i)
  87                         image(enumerate_faces(i), level, 0);
  88         }
  89 }
  90
  91 void TextureCube::image(TextureCubeFace face, unsigned level, const void *data)
  92 {
  93         if(size==0)
  94                 throw invalid_operation("TextureCube::image");
  95
  96         unsigned s = get_level_size(level);
  97         if(s==0)
  98                 throw out_of_range("TextureCube::image");
  99
 100         if(ARB_texture_storage)
 101                 return sub_image(face, level, 0, 0, s, s, data);
 102
 103         BindRestore _bind(this);
 104
 105         if(!allocated)
 106         {
 107                 glTexParameteri(target, GL_TEXTURE_MAX_LEVEL, levels-1);
 108                 apply_swizzle();
 109         }
 110
 111         PixelComponents comp = get_components(storage_fmt);
 112         DataType type = get_component_type(storage_fmt);
 113         glTexImage2D(face, level, storage_fmt, s, s, 0, comp, type, data);
 114
 115         if(level==0)
 116         {
 117                 allocated |= 1<<get_face_index(face);
 118                 if((allocated&63)==63)
 119                 {
 120                         allocated |= 64;
 121                         if(auto_gen_mipmap)
 122                         {
 123                                 generate_mipmap();
 124                                 allocated |= (64<<levels)-1;
 125                         }
 126                 }
 127         }
 128         else if(!(allocated&(64<<level)))
 129         {
 130                 for(unsigned i=0; i<6; ++i)
 131                         if(enumerate_faces(i)!=face)
 132                                 glTexImage2D(enumerate_faces(i), level, storage_fmt, s, s, 0, comp, type, 0);
 133
 134                 allocated |= 64<<level;
 135         }
 136 }
 137
 138 void TextureCube::image(TextureCubeFace face, unsigned level, PixelComponents comp, DataType type, const void *data)
 139 {
 140         if(comp!=get_components(format) || type!=get_component_type(format))
 141                 throw incompatible_data("TextureCube::image");
 142         image(face, level, data);
 143 }
 144
 145 void TextureCube::sub_image(TextureCubeFace face, unsigned level, int x, int y, unsigned wd, unsigned ht, const void *data)
 146 {
 147         if(size==0)
 148                 throw invalid_operation("TextureCube::sub_image");
 149
 150         BindRestore _bind(this);
 151         allocate(level);
 152
 153         PixelComponents comp = get_components(storage_fmt);
 154         DataType type = get_component_type(storage_fmt);
 155         glTexSubImage2D(face, level, x, y, wd, ht, comp, type, data);
 156
 157         if(auto_gen_mipmap && level==0)
 158                 generate_mipmap();
 159 }
 160
 161 void TextureCube::sub_image(TextureCubeFace face, unsigned level, int x, int y, unsigned wd, unsigned ht, PixelComponents comp, DataType type, const void *data)
 162 {
 163         if(comp!=get_components(format) || type!=get_component_type(format))
 164                 throw incompatible_data("TextureCube::subimage");
 165         sub_image(face, level, x, y, wd, ht, data);
 166 }
 167
 168 void TextureCube::image(TextureCubeFace face, const Graphics::Image &img, bool srgb)
 169 {
 170         unsigned w = img.get_width();
 171         unsigned h = img.get_height();
 172         PixelFormat fmt = pixelformat_from_image(img);
 173         if(size==0)
 174         {
 175                 if(w!=h)
 176                         throw incompatible_data("TextureCube::image");
 177
 178                 storage(make_pixelformat(get_components(fmt), get_component_type(fmt), srgb), w);
 179         }
 180         else if(w!=size || h!=size)
 181                 throw incompatible_data("TextureCube::image");
 182
 183         PixelStore pstore = PixelStore::from_image(img);
 184         BindRestore _bind_ps(pstore);
 185
 186         image(face, 0, img.get_data());
 187 }
 188
 189 void TextureCube::image(const Graphics::Image &img, unsigned lv, bool srgb)
 190 {
 191         unsigned w = img.get_width();
 192         unsigned h = img.get_height();
 193
 194         if(h!=w*6)
 195                 throw incompatible_data("TextureCube::image");
 196         h /= 6;
 197
 198         PixelFormat fmt = pixelformat_from_image(img);
 199         if(size==0)
 200                 storage(make_pixelformat(get_components(fmt), get_component_type(fmt), srgb), w, lv);
 201         else if(w!=size || h!=size)
 202                 throw incompatible_data("TextureCube::image");
 203
 204         PixelStore pstore = PixelStore::from_image(img);
 205         BindRestore _bind_ps(pstore);
 206
 207         const char *cdata = reinterpret_cast<const char *>(img.get_data());
 208         unsigned face_size = img.get_stride()*size;
 209         for(unsigned i=0; i<6; ++i)
 210                 image(enumerate_faces(i), 0, cdata+i*face_size);
 211 }
 212
 213 unsigned TextureCube::get_n_levels() const
 214 {
 215         unsigned n = 0;
 216         for(unsigned s=size; s; s>>=1, ++n) ;
 217         return n;
 218 }
 219
 220 unsigned TextureCube::get_level_size(unsigned level) const
 221 {
 222         return size>>level;
 223 }
 224
 225 TextureCubeFace TextureCube::enumerate_faces(unsigned i)
 226 {
 227         if(i>=6)
 228                 throw out_of_range("TextureCube::enumerate_faces");
 229         return face_order[i];
 230 }
 231
 232 unsigned TextureCube::get_face_index(TextureCubeFace face)
 233 {
 234         switch(face)
 235         {
 236         case POSITIVE_X: return 0;
 237         case NEGATIVE_X: return 1;
 238         case POSITIVE_Y: return 2;
 239         case NEGATIVE_Y: return 3;
 240         case POSITIVE_Z: return 4;
 241         case NEGATIVE_Z: return 5;
 242         default: throw invalid_argument("TextureCube::get_face_index");
 243         }
 244 }
 245
 246 const Vector3 &TextureCube::get_face_direction(TextureCubeFace face)
 247 {
 248         return directions[get_face_index(face)];
 249 }
 250
 251 const Vector3 &TextureCube::get_s_direction(TextureCubeFace face)
 252 {
 253         return directions[orientations[get_face_index(face)*2]];
 254 }
 255
 256 const Vector3 &TextureCube::get_t_direction(TextureCubeFace face)
 257 {
 258         return directions[orientations[get_face_index(face)*2+1]];
 259 }
 260
 261 Vector3 TextureCube::get_texel_direction(TextureCubeFace face, unsigned u, unsigned v)
 262 {
 263         float s = (u+0.5f)*2.0f/size-1.0f;
 264         float t = (v+0.5f)*2.0f/size-1.0f;
 265         const Vector3 &fv = get_face_direction(face);
 266         const Vector3 &sv = get_s_direction(face);
 267         const Vector3 &tv = get_t_direction(face);
 268         return fv+s*sv+t*tv;
 269 }
 270
 271 UInt64 TextureCube::get_data_size() const
 272 {
 273         return id ? size*size*6*get_pixel_size(storage_fmt) : 0;
 274 }
 275
 276
 277 TextureCube::Loader::Loader(TextureCube &t):
 278         DataFile::DerivedObjectLoader<TextureCube, Texture::Loader>(t)
 279 {
 280         init();
 281 }
 282
 283 TextureCube::Loader::Loader(TextureCube &t, Collection &c):
 284         DataFile::DerivedObjectLoader<TextureCube, Texture::Loader>(t, c)
 285 {
 286         init();
 287 }
 288
 289 void TextureCube::Loader::init()
 290 {
 291         add("external_image", &Loader::external_image);
 292         add("image_data", &Loader::image_data);
 293         add("raw_data", &Loader::raw_data);
 294         add("storage", &Loader::storage);
 295         add("storage", &Loader::storage_levels);
 296 }
 297
 298 void TextureCube::Loader::external_image(TextureCubeFace face, const string &fn)
 299 {
 300         Graphics::Image img;
 301         RefPtr<IO::Seekable> io = get_collection().open_raw(fn);
 302         img.load_io(*io);
 303
 304         obj.image(face, img, srgb);
 305 }
 306
 307 void TextureCube::Loader::image_data(TextureCubeFace face, const string &data)
 308 {
 309         Graphics::Image img;
 310         IO::Memory mem(data.data(), data.size());
 311         img.load_io(mem);
 312
 313         obj.image(face, img, srgb);
 314 }
 315
 316 void TextureCube::Loader::raw_data(TextureCubeFace face, const string &data)
 317 {
 318         obj.image(face, 0, data.data());
 319 }
 320
 321 void TextureCube::Loader::storage(PixelFormat fmt, unsigned s)
 322 {
 323         obj.storage(fmt, s);
 324 }
 325
 326 void TextureCube::Loader::storage_levels(PixelFormat fmt, unsigned s, unsigned l)
 327 {
 328         obj.storage(fmt, s, l);
 329 }
 330
 331
 332 void operator>>(const LexicalConverter &conv, TextureCubeFace &face)
 333 {
 334         const string &str = conv.get();
 335         if(str=="POSITIVE_X")
 336                 face = POSITIVE_X;
 337         else if(str=="NEGATIVE_X")
 338                 face = NEGATIVE_X;
 339         else if(str=="POSITIVE_Y")
 340                 face = POSITIVE_Y;
 341         else if(str=="NEGATIVE_Y")
 342                 face = NEGATIVE_Y;
 343         else if(str=="POSITIVE_Z")
 344                 face = POSITIVE_Z;
 345         else if(str=="NEGATIVE_Z")
 346                 face = NEGATIVE_Z;
 347         else
 348                 throw lexical_error(format("conversion of '%s' to TextureCubeFace", str));
 349 }
 350
 351 } // namespace GL
 352 } // namespace Msp