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