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