source/core/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         {
  58                 if(fmt!=format || sz!=size || (lv && lv!=levels))
  59                         throw incompatible_data("TextureCube::storage");
  60                 return;
  61         }
  62         if(sz==0)
  63                 throw invalid_argument("TextureCube::storage");
  64
  65         set_format(fmt);
  66         size = sz;
  67         levels = get_n_levels();
  68         if(lv>0)
  69                 levels = min(levels, lv);
  70 }
  71
  72 void TextureCube::allocate(unsigned level)
  73 {
  74         if(size==0)
  75                 throw invalid_operation("TextureCube::allocate");
  76         if(level>=levels)
  77                 throw invalid_argument("TextureCube::allocate");
  78         if(allocated&(64<<level))
  79                 return;
  80
  81         if(ARB_texture_storage)
  82         {
  83                 BindRestore _bind(this);
  84                 glTexStorage2D(target, levels, storage_fmt, size, size);
  85                 apply_swizzle();
  86                 allocated |= (64<<levels)-1;
  87         }
  88         else
  89         {
  90                 for(unsigned i=0; i<6; ++i)
  91                         image(enumerate_faces(i), level, 0);
  92         }
  93 }
  94
  95 void TextureCube::image(TextureCubeFace face, unsigned level, const void *data)
  96 {
  97         if(size==0)
  98                 throw invalid_operation("TextureCube::image");
  99
 100         unsigned s = get_level_size(level);
 101         if(s==0)
 102                 throw out_of_range("TextureCube::image");
 103
 104         if(ARB_texture_storage)
 105                 return sub_image(face, level, 0, 0, s, s, data);
 106
 107         BindRestore _bind(this);
 108
 109         if(!allocated)
 110         {
 111                 glTexParameteri(target, GL_TEXTURE_MAX_LEVEL, levels-1);
 112                 apply_swizzle();
 113         }
 114
 115         PixelComponents comp = get_components(storage_fmt);
 116         GLenum type = get_gl_type(get_component_type(storage_fmt));
 117         glTexImage2D(face, level, storage_fmt, s, s, 0, comp, type, data);
 118
 119         if(level==0)
 120         {
 121                 allocated |= 1<<get_face_index(face);
 122                 if((allocated&63)==63)
 123                 {
 124                         allocated |= 64;
 125                         if(auto_gen_mipmap)
 126                         {
 127                                 generate_mipmap();
 128                                 allocated |= (64<<levels)-1;
 129                         }
 130                 }
 131         }
 132         else if(!(allocated&(64<<level)))
 133         {
 134                 for(unsigned i=0; i<6; ++i)
 135                         if(enumerate_faces(i)!=face)
 136                                 glTexImage2D(enumerate_faces(i), level, storage_fmt, s, s, 0, comp, type, 0);
 137
 138                 allocated |= 64<<level;
 139         }
 140 }
 141
 142 void TextureCube::image(TextureCubeFace face, unsigned level, PixelComponents comp, DataType type, const void *data)
 143 {
 144         if(comp!=get_components(format) || type!=get_component_type(format))
 145                 throw incompatible_data("TextureCube::image");
 146         image(face, level, data);
 147 }
 148
 149 void TextureCube::sub_image(TextureCubeFace face, unsigned level, int x, int y, unsigned wd, unsigned ht, const void *data)
 150 {
 151         if(size==0)
 152                 throw invalid_operation("TextureCube::sub_image");
 153
 154         BindRestore _bind(this);
 155         allocate(level);
 156
 157         PixelComponents comp = get_components(storage_fmt);
 158         GLenum type = get_gl_type(get_component_type(storage_fmt));
 159         glTexSubImage2D(face, level, x, y, wd, ht, comp, type, data);
 160
 161         if(auto_gen_mipmap && level==0)
 162                 generate_mipmap();
 163 }
 164
 165 void TextureCube::sub_image(TextureCubeFace face, unsigned level, int x, int y, unsigned wd, unsigned ht, PixelComponents comp, DataType type, const void *data)
 166 {
 167         if(comp!=get_components(format) || type!=get_component_type(format))
 168                 throw incompatible_data("TextureCube::subimage");
 169         sub_image(face, level, x, y, wd, ht, data);
 170 }
 171
 172 void TextureCube::image(TextureCubeFace face, const Graphics::Image &img)
 173 {
 174         unsigned w = img.get_width();
 175         unsigned h = img.get_height();
 176         if(w!=h)
 177                 throw incompatible_data("TextureCube::image");
 178
 179         PixelFormat fmt = pixelformat_from_image(img);
 180         storage(make_pixelformat(get_components(fmt), get_component_type(fmt), use_srgb_format), w);
 181
 182         PixelStore pstore = PixelStore::from_image(img);
 183         BindRestore _bind_ps(pstore);
 184
 185         image(face, 0, img.get_pixels());
 186 }
 187
 188 void TextureCube::image(TextureCubeFace face, const Graphics::Image &img, bool)
 189 {
 190         image(face, img);
 191 }
 192
 193 void TextureCube::image(const Graphics::Image &img, unsigned lv)
 194 {
 195         unsigned w = img.get_width();
 196         unsigned h = img.get_height();
 197
 198         if(h!=w*6)
 199                 throw incompatible_data("TextureCube::image");
 200         h /= 6;
 201
 202         PixelFormat fmt = pixelformat_from_image(img);
 203         if(size==0)
 204                 storage(make_pixelformat(get_components(fmt), get_component_type(fmt), use_srgb_format), w, lv);
 205         else if(w!=size || h!=size)
 206                 throw incompatible_data("TextureCube::image");
 207
 208         PixelStore pstore = PixelStore::from_image(img);
 209         BindRestore _bind_ps(pstore);
 210
 211         const char *pixels = reinterpret_cast<const char *>(img.get_pixels());
 212         unsigned face_size = img.get_stride()*size;
 213         for(unsigned i=0; i<6; ++i)
 214                 image(enumerate_faces(i), 0, pixels+i*face_size);
 215 }
 216
 217 unsigned TextureCube::get_n_levels() const
 218 {
 219         unsigned n = 0;
 220         for(unsigned s=size; s; s>>=1, ++n) ;
 221         return n;
 222 }
 223
 224 unsigned TextureCube::get_level_size(unsigned level) const
 225 {
 226         return size>>level;
 227 }
 228
 229 TextureCubeFace TextureCube::enumerate_faces(unsigned i)
 230 {
 231         if(i>=6)
 232                 throw out_of_range("TextureCube::enumerate_faces");
 233         return face_order[i];
 234 }
 235
 236 unsigned TextureCube::get_face_index(TextureCubeFace face)
 237 {
 238         switch(face)
 239         {
 240         case POSITIVE_X: return 0;
 241         case NEGATIVE_X: return 1;
 242         case POSITIVE_Y: return 2;
 243         case NEGATIVE_Y: return 3;
 244         case POSITIVE_Z: return 4;
 245         case NEGATIVE_Z: return 5;
 246         default: throw invalid_argument("TextureCube::get_face_index");
 247         }
 248 }
 249
 250 const Vector3 &TextureCube::get_face_direction(TextureCubeFace face)
 251 {
 252         return directions[get_face_index(face)];
 253 }
 254
 255 const Vector3 &TextureCube::get_s_direction(TextureCubeFace face)
 256 {
 257         return directions[orientations[get_face_index(face)*2]];
 258 }
 259
 260 const Vector3 &TextureCube::get_t_direction(TextureCubeFace face)
 261 {
 262         return directions[orientations[get_face_index(face)*2+1]];
 263 }
 264
 265 Vector3 TextureCube::get_texel_direction(TextureCubeFace face, unsigned u, unsigned v)
 266 {
 267         float s = (u+0.5f)*2.0f/size-1.0f;
 268         float t = (v+0.5f)*2.0f/size-1.0f;
 269         const Vector3 &fv = get_face_direction(face);
 270         const Vector3 &sv = get_s_direction(face);
 271         const Vector3 &tv = get_t_direction(face);
 272         return fv+s*sv+t*tv;
 273 }
 274
 275 UInt64 TextureCube::get_data_size() const
 276 {
 277         return id ? size*size*6*get_pixel_size(storage_fmt) : 0;
 278 }
 279
 280
 281 TextureCube::Loader::Loader(TextureCube &t):
 282         DataFile::DerivedObjectLoader<TextureCube, Texture::Loader>(t)
 283 {
 284         init();
 285 }
 286
 287 TextureCube::Loader::Loader(TextureCube &t, Collection &c):
 288         DataFile::DerivedObjectLoader<TextureCube, Texture::Loader>(t, c)
 289 {
 290         init();
 291 }
 292
 293 void TextureCube::Loader::init()
 294 {
 295         add("external_image", &Loader::external_image);
 296         add("image_data", &Loader::image_data);
 297         add("raw_data", &Loader::raw_data);
 298         add("storage", &Loader::storage);
 299         add("storage", &Loader::storage_levels);
 300 }
 301
 302 void TextureCube::Loader::external_image(TextureCubeFace face, const string &fn)
 303 {
 304         Graphics::Image img;
 305         RefPtr<IO::Seekable> io = get_collection().open_raw(fn);
 306         img.load_io(*io);
 307
 308         obj.image(face, img);
 309 }
 310
 311 void TextureCube::Loader::image_data(TextureCubeFace face, const string &data)
 312 {
 313         Graphics::Image img;
 314         IO::Memory mem(data.data(), data.size());
 315         img.load_io(mem);
 316
 317         obj.image(face, img);
 318 }
 319
 320 void TextureCube::Loader::raw_data(TextureCubeFace face, const string &data)
 321 {
 322         obj.image(face, 0, data.data());
 323 }
 324
 325 void TextureCube::Loader::storage(PixelFormat fmt, unsigned s)
 326 {
 327         obj.storage(fmt, s);
 328 }
 329
 330 void TextureCube::Loader::storage_levels(PixelFormat fmt, unsigned s, unsigned l)
 331 {
 332         obj.storage(fmt, s, l);
 333 }
 334
 335
 336 void operator>>(const LexicalConverter &conv, TextureCubeFace &face)
 337 {
 338         const string &str = conv.get();
 339         if(str=="POSITIVE_X")
 340                 face = POSITIVE_X;
 341         else if(str=="NEGATIVE_X")
 342                 face = NEGATIVE_X;
 343         else if(str=="POSITIVE_Y")
 344                 face = POSITIVE_Y;
 345         else if(str=="NEGATIVE_Y")
 346                 face = NEGATIVE_Y;
 347         else if(str=="POSITIVE_Z")
 348                 face = POSITIVE_Z;
 349         else if(str=="NEGATIVE_Z")
 350                 face = NEGATIVE_Z;
 351         else
 352                 throw lexical_error(format("conversion of '%s' to TextureCubeFace", str));
 353 }
 354
 355 } // namespace GL
 356 } // namespace Msp