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