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         ifmt(RGB),
  49         size(0),
  50         allocated(0)
  51 {
  52         static Require _req(ARB_texture_cube_map);
  53 }
  54
  55 void TextureCube::storage(PixelFormat fmt, unsigned sz)
  56 {
  57         if(size>0)
  58                 throw invalid_operation("TextureCube::storage");
  59         if(sz==0)
  60                 throw invalid_argument("TextureCube::storage");
  61
  62         if(MSP_sized_internal_formats)
  63                 fmt = get_sized_pixelformat(fmt);
  64         require_pixelformat(fmt);
  65
  66         ifmt = fmt;
  67         size = sz;
  68 }
  69
  70 void TextureCube::allocate(unsigned level)
  71 {
  72         if(allocated&(1<<level))
  73                 return;
  74
  75         if(ARB_texture_storage)
  76         {
  77                 BindRestore _bind(this);
  78                 unsigned n_levels = (is_mipmapped(min_filter) ? get_n_levels() : 1);
  79                 glTexStorage2D(target, n_levels, ifmt, size, size);
  80                 allocated |= (1<<n_levels)-1;
  81         }
  82         else
  83         {
  84                 PixelFormat base_fmt = get_base_pixelformat(ifmt);
  85                 DataType type = get_alloc_type(base_fmt);
  86                 for(unsigned i=0; i<6; ++i)
  87                         image(enumerate_faces(i), level, base_fmt, type, 0);
  88         }
  89 }
  90
  91 void TextureCube::image(TextureCubeFace face, unsigned level, PixelFormat fmt, DataType type, const void *data)
  92 {
  93         if(size==0)
  94                 throw invalid_operation("TextureCube::image");
  95
  96         unsigned s = get_level_size(level);
  97         if(s==0)
  98                 throw out_of_range("TextureCube::image");
  99
 100         if(ARB_texture_storage)
 101                 return sub_image(face, level, 0, 0, s, s, fmt, type, data);
 102
 103         BindRestore _bind(this);
 104         glTexImage2D(face, level, ifmt, s, s, 0, fmt, type, data);
 105
 106         // XXX Allocation should be tracked per-face, but we'll run out of bits
 107         allocated |= 1<<level;
 108         if(gen_mipmap && level==0)
 109         {
 110                 // TODO Only do this once all faces are created
 111                 auto_generate_mipmap();
 112                 allocated |= (1<<get_n_levels())-1;
 113         }
 114 }
 115
 116 void TextureCube::sub_image(TextureCubeFace face, unsigned level, int x, int y, unsigned wd, unsigned ht, PixelFormat fmt, DataType type, const void *data)
 117 {
 118         if(size==0)
 119                 throw invalid_operation("TextureCube::sub_image");
 120
 121         BindRestore _bind(this);
 122         allocate(level);
 123
 124         glTexSubImage2D(face, level, x, y, wd, ht, fmt, type, data);
 125
 126         if(gen_mipmap && level==0)
 127                 auto_generate_mipmap();
 128 }
 129
 130 void TextureCube::image(TextureCubeFace face, const Graphics::Image &img, bool srgb)
 131 {
 132         unsigned w = img.get_width();
 133         unsigned h = img.get_height();
 134         PixelFormat fmt = pixelformat_from_graphics(img.get_format());
 135         if(size==0)
 136         {
 137                 if(w!=h)
 138                         throw incompatible_data("TextureCube::image");
 139
 140                 storage(storage_pixelformat_from_graphics(img.get_format(), srgb), w);
 141         }
 142         else if(w!=size || h!=size)
 143                 throw incompatible_data("TextureCube::image");
 144
 145         PixelStore pstore = PixelStore::from_image(img);
 146         BindRestore _bind_ps(pstore);
 147
 148         image(face, 0, fmt, UNSIGNED_BYTE, img.get_data());
 149 }
 150
 151 void TextureCube::image(const Graphics::Image &img, bool srgb)
 152 {
 153         unsigned w = img.get_width();
 154         unsigned h = img.get_height();
 155
 156         if(h!=w*6)
 157                 throw incompatible_data("TextureCube::image");
 158         h /= 6;
 159
 160         PixelFormat fmt = pixelformat_from_graphics(img.get_format());
 161         if(size==0)
 162                 storage(storage_pixelformat_from_graphics(img.get_format(), srgb), w);
 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         const char *cdata = reinterpret_cast<const char *>(img.get_data());
 170         unsigned face_size = img.get_stride()*size;
 171         for(unsigned i=0; i<6; ++i)
 172                 image(enumerate_faces(i), 0, fmt, UNSIGNED_BYTE, cdata+i*face_size);
 173 }
 174
 175 unsigned TextureCube::get_n_levels() const
 176 {
 177         unsigned n = 0;
 178         for(unsigned s=size; s; s>>=1, ++n) ;
 179         return n;
 180 }
 181
 182 unsigned TextureCube::get_level_size(unsigned level) const
 183 {
 184         return size>>level;
 185 }
 186
 187 TextureCubeFace TextureCube::enumerate_faces(unsigned i)
 188 {
 189         if(i>=6)
 190                 throw out_of_range("TextureCube::enumerate_faces");
 191         return face_order[i];
 192 }
 193
 194 unsigned TextureCube::get_face_index(TextureCubeFace face)
 195 {
 196         switch(face)
 197         {
 198         case POSITIVE_X: return 0;
 199         case NEGATIVE_X: return 1;
 200         case POSITIVE_Y: return 2;
 201         case NEGATIVE_Y: return 3;
 202         case POSITIVE_Z: return 4;
 203         case NEGATIVE_Z: return 5;
 204         default: throw invalid_argument("TextureCube::get_face_index");
 205         }
 206 }
 207
 208 const Vector3 &TextureCube::get_face_direction(TextureCubeFace face)
 209 {
 210         return directions[get_face_index(face)];
 211 }
 212
 213 const Vector3 &TextureCube::get_s_direction(TextureCubeFace face)
 214 {
 215         return directions[orientations[get_face_index(face)*2]];
 216 }
 217
 218 const Vector3 &TextureCube::get_t_direction(TextureCubeFace face)
 219 {
 220         return directions[orientations[get_face_index(face)*2+1]];
 221 }
 222
 223 Vector3 TextureCube::get_texel_direction(TextureCubeFace face, unsigned u, unsigned v)
 224 {
 225         float s = (u+0.5f)*2.0f/size-1.0f;
 226         float t = (v+0.5f)*2.0f/size-1.0f;
 227         const Vector3 &fv = get_face_direction(face);
 228         const Vector3 &sv = get_s_direction(face);
 229         const Vector3 &tv = get_t_direction(face);
 230         return fv+s*sv+t*tv;
 231 }
 232
 233 UInt64 TextureCube::get_data_size() const
 234 {
 235         return id ? size*size*6*get_pixel_size(ifmt) : 0;
 236 }
 237
 238
 239 TextureCube::Loader::Loader(TextureCube &t):
 240         DataFile::DerivedObjectLoader<TextureCube, Texture::Loader>(t)
 241 {
 242         init();
 243 }
 244
 245 TextureCube::Loader::Loader(TextureCube &t, Collection &c):
 246         DataFile::DerivedObjectLoader<TextureCube, Texture::Loader>(t, c)
 247 {
 248         init();
 249 }
 250
 251 void TextureCube::Loader::init()
 252 {
 253         add("external_image", &Loader::external_image);
 254         add("image_data", &Loader::image_data);
 255         add("raw_data", &Loader::raw_data);
 256         add("storage", &Loader::storage);
 257 }
 258
 259 void TextureCube::Loader::external_image(TextureCubeFace face, const string &fn)
 260 {
 261         Graphics::Image img;
 262         RefPtr<IO::Seekable> io = get_collection().open_raw(fn);
 263         img.load_io(*io);
 264
 265         obj.image(face, img, srgb);
 266 }
 267
 268 void TextureCube::Loader::image_data(TextureCubeFace face, const string &data)
 269 {
 270         Graphics::Image img;
 271         IO::Memory mem(data.data(), data.size());
 272         img.load_io(mem);
 273
 274         obj.image(face, img, srgb);
 275 }
 276
 277 void TextureCube::Loader::raw_data(TextureCubeFace face, const string &data)
 278 {
 279         obj.image(face, 0, get_base_pixelformat(obj.ifmt), UNSIGNED_BYTE, data.data());
 280 }
 281
 282 void TextureCube::Loader::storage(PixelFormat fmt, unsigned s)
 283 {
 284         if(srgb)
 285                 fmt = get_srgb_pixelformat(fmt);
 286         obj.storage(fmt, s);
 287 }
 288
 289
 290 void operator>>(const LexicalConverter &conv, TextureCubeFace &face)
 291 {
 292         const string &str = conv.get();
 293         if(str=="POSITIVE_X")
 294                 face = POSITIVE_X;
 295         else if(str=="NEGATIVE_X")
 296                 face = NEGATIVE_X;
 297         else if(str=="POSITIVE_Y")
 298                 face = POSITIVE_Y;
 299         else if(str=="NEGATIVE_Y")
 300                 face = NEGATIVE_Y;
 301         else if(str=="POSITIVE_Z")
 302                 face = POSITIVE_Z;
 303         else if(str=="NEGATIVE_Z")
 304                 face = NEGATIVE_Z;
 305         else
 306                 throw lexical_error(format("conversion of '%s' to TextureCubeFace", str));
 307 }
 308
 309 } // namespace GL
 310 } // namespace Msp