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         if(ARB_texture_storage)
  84         {
  85                 GLenum fmt = get_gl_pixelformat(storage_fmt);
  86                 if(ARB_direct_state_access)
  87                         glTextureStorage2D(id, levels, fmt, size, size);
  88                 else
  89                 {
  90                         bind_scratch();
  91                         glTexStorage2D(target, levels, fmt, size, size);
  92                 }
  93                 apply_swizzle();
  94                 allocated |= (64<<levels)-1;
  95         }
  96         else
  97         {
  98                 for(unsigned i=0; i<6; ++i)
  99                         image(enumerate_faces(i), level, 0);
 100         }
 101 }
 102
 103 void TextureCube::image(TextureCubeFace face, unsigned level, const void *data)
 104 {
 105         if(size==0)
 106                 throw invalid_operation("TextureCube::image");
 107         if(level>=levels)
 108                 throw out_of_range("TextureCube::image");
 109
 110         unsigned lsz = get_level_size(level);
 111
 112         if(ARB_texture_storage)
 113                 return sub_image(face, level, 0, 0, lsz, lsz, data);
 114
 115         if(!allocated)
 116         {
 117                 glTexParameteri(target, GL_TEXTURE_MAX_LEVEL, levels-1);
 118                 apply_swizzle();
 119         }
 120
 121         GLenum fmt = get_gl_pixelformat(storage_fmt);
 122         GLenum comp = get_gl_components(get_components(storage_fmt));
 123         GLenum type = get_gl_type(get_component_type(storage_fmt));
 124         glTexImage2D(face, level, fmt, lsz, lsz, 0, comp, type, data);
 125
 126         if(level==0)
 127         {
 128                 allocated |= 1<<get_face_index(face);
 129                 if((allocated&63)==63)
 130                         allocated |= 64;
 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, fmt, lsz, lsz, 0, comp, type, 0);
 137
 138                 allocated |= 64<<level;
 139         }
 140 }
 141
 142 void TextureCube::sub_image(TextureCubeFace face, unsigned level, int x, int y, unsigned wd, unsigned ht, const void *data)
 143 {
 144         if(size==0)
 145                 throw invalid_operation("TextureCube::sub_image");
 146         if(level>=levels)
 147                 throw out_of_range("TextureCube::sub_image");
 148
 149         allocate(level);
 150
 151         GLenum comp = get_gl_components(get_components(storage_fmt));
 152         GLenum type = get_gl_type(get_component_type(storage_fmt));
 153         if(ARB_direct_state_access)
 154                 glTextureSubImage3D(id, level, x, y, get_face_index(face), wd, ht, 1, comp, type, data);
 155         else
 156         {
 157                 bind_scratch();
 158                 glTexSubImage2D(face, level, x, y, wd, ht, comp, type, data);
 159         }
 160 }
 161
 162 void TextureCube::image(TextureCubeFace face, const Graphics::Image &img)
 163 {
 164         unsigned w = img.get_width();
 165         unsigned h = img.get_height();
 166         if(w!=h)
 167                 throw incompatible_data("TextureCube::image");
 168
 169         PixelFormat fmt = pixelformat_from_image(img);
 170         storage(make_pixelformat(get_components(fmt), get_component_type(fmt), use_srgb_format), w);
 171
 172         image(face, 0, img.get_pixels());
 173 }
 174
 175 void TextureCube::image(const Graphics::Image &img, unsigned lv)
 176 {
 177         unsigned w = img.get_width();
 178         unsigned h = img.get_height();
 179
 180         if(h!=w*6)
 181                 throw incompatible_data("TextureCube::image");
 182         h /= 6;
 183
 184         PixelFormat fmt = pixelformat_from_image(img);
 185         if(size==0)
 186                 storage(make_pixelformat(get_components(fmt), get_component_type(fmt), use_srgb_format), w, lv);
 187         else if(w!=size || h!=size)
 188                 throw incompatible_data("TextureCube::image");
 189
 190         const char *pixels = reinterpret_cast<const char *>(img.get_pixels());
 191         unsigned face_size = img.get_stride()*size;
 192         for(unsigned i=0; i<6; ++i)
 193                 image(enumerate_faces(i), 0, pixels+i*face_size);
 194 }
 195
 196 unsigned TextureCube::get_n_levels() const
 197 {
 198         unsigned n = 0;
 199         for(unsigned s=size; s; s>>=1, ++n) ;
 200         return n;
 201 }
 202
 203 unsigned TextureCube::get_level_size(unsigned level) const
 204 {
 205         return size>>level;
 206 }
 207
 208 TextureCubeFace TextureCube::enumerate_faces(unsigned i)
 209 {
 210         if(i>=6)
 211                 throw out_of_range("TextureCube::enumerate_faces");
 212         return face_order[i];
 213 }
 214
 215 unsigned TextureCube::get_face_index(TextureCubeFace face)
 216 {
 217         switch(face)
 218         {
 219         case POSITIVE_X: return 0;
 220         case NEGATIVE_X: return 1;
 221         case POSITIVE_Y: return 2;
 222         case NEGATIVE_Y: return 3;
 223         case POSITIVE_Z: return 4;
 224         case NEGATIVE_Z: return 5;
 225         default: throw invalid_argument("TextureCube::get_face_index");
 226         }
 227 }
 228
 229 const Vector3 &TextureCube::get_face_direction(TextureCubeFace face)
 230 {
 231         return directions[get_face_index(face)];
 232 }
 233
 234 const Vector3 &TextureCube::get_s_direction(TextureCubeFace face)
 235 {
 236         return directions[orientations[get_face_index(face)*2]];
 237 }
 238
 239 const Vector3 &TextureCube::get_t_direction(TextureCubeFace face)
 240 {
 241         return directions[orientations[get_face_index(face)*2+1]];
 242 }
 243
 244 Vector3 TextureCube::get_texel_direction(TextureCubeFace face, unsigned u, unsigned v)
 245 {
 246         float s = (u+0.5f)*2.0f/size-1.0f;
 247         float t = (v+0.5f)*2.0f/size-1.0f;
 248         const Vector3 &fv = get_face_direction(face);
 249         const Vector3 &sv = get_s_direction(face);
 250         const Vector3 &tv = get_t_direction(face);
 251         return fv+s*sv+t*tv;
 252 }
 253
 254 uint64_t TextureCube::get_data_size() const
 255 {
 256         return id ? size*size*6*get_pixel_size(storage_fmt) : 0;
 257 }
 258
 259
 260 TextureCube::Loader::Loader(TextureCube &t):
 261         DataFile::DerivedObjectLoader<TextureCube, Texture::Loader>(t)
 262 {
 263         init();
 264 }
 265
 266 TextureCube::Loader::Loader(TextureCube &t, Collection &c):
 267         DataFile::DerivedObjectLoader<TextureCube, Texture::Loader>(t, c)
 268 {
 269         init();
 270 }
 271
 272 void TextureCube::Loader::init()
 273 {
 274         add("external_image", &Loader::external_image);
 275         add("image_data", &Loader::image_data);
 276         add("raw_data", &Loader::raw_data);
 277         add("storage", &Loader::storage);
 278         add("storage", &Loader::storage_levels);
 279 }
 280
 281 void TextureCube::Loader::external_image(TextureCubeFace face, const string &fn)
 282 {
 283         Graphics::Image img;
 284         RefPtr<IO::Seekable> io = get_collection().open_raw(fn);
 285         img.load_io(*io);
 286
 287         obj.image(face, img);
 288 }
 289
 290 void TextureCube::Loader::image_data(TextureCubeFace face, const string &data)
 291 {
 292         Graphics::Image img;
 293         IO::Memory mem(data.data(), data.size());
 294         img.load_io(mem);
 295
 296         obj.image(face, img);
 297 }
 298
 299 void TextureCube::Loader::raw_data(TextureCubeFace face, const string &data)
 300 {
 301         obj.image(face, 0, data.data());
 302 }
 303
 304 void TextureCube::Loader::storage(PixelFormat fmt, unsigned s)
 305 {
 306         obj.storage(fmt, s);
 307 }
 308
 309 void TextureCube::Loader::storage_levels(PixelFormat fmt, unsigned s, unsigned l)
 310 {
 311         obj.storage(fmt, s, l);
 312 }
 313
 314
 315 void operator>>(const LexicalConverter &conv, TextureCubeFace &face)
 316 {
 317         const string &str = conv.get();
 318         if(str=="POSITIVE_X")
 319                 face = POSITIVE_X;
 320         else if(str=="NEGATIVE_X")
 321                 face = NEGATIVE_X;
 322         else if(str=="POSITIVE_Y")
 323                 face = POSITIVE_Y;
 324         else if(str=="NEGATIVE_Y")
 325                 face = NEGATIVE_Y;
 326         else if(str=="POSITIVE_Z")
 327                 face = POSITIVE_Z;
 328         else if(str=="NEGATIVE_Z")
 329                 face = NEGATIVE_Z;
 330         else
 331                 throw lexical_error(format("conversion of '%s' to TextureCubeFace", str));
 332 }
 333
 334 } // namespace GL
 335 } // namespace Msp