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)
  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 }
  64
  65 void TextureCube::allocate(unsigned level)
  66 {
  67         if(size==0)
  68                 throw invalid_operation("TextureCube::allocate");
  69         if(allocated&(1<<level))
  70                 return;
  71
  72         if(ARB_texture_storage)
  73         {
  74                 BindRestore _bind(this);
  75                 unsigned n_levels = (is_mipmapped(min_filter) ? get_n_levels() : 1);
  76                 glTexStorage2D(target, n_levels, ifmt, size, size);
  77                 allocated |= (1<<n_levels)-1;
  78         }
  79         else
  80         {
  81                 PixelFormat base_fmt = get_base_pixelformat(ifmt);
  82                 DataType type = get_alloc_type(base_fmt);
  83                 for(unsigned i=0; i<6; ++i)
  84                         image(enumerate_faces(i), level, base_fmt, type, 0);
  85         }
  86 }
  87
  88 void TextureCube::image(TextureCubeFace face, unsigned level, PixelFormat fmt, DataType type, const void *data)
  89 {
  90         if(size==0)
  91                 throw invalid_operation("TextureCube::image");
  92
  93         unsigned s = get_level_size(level);
  94         if(s==0)
  95                 throw out_of_range("TextureCube::image");
  96
  97         if(ARB_texture_storage)
  98                 return sub_image(face, level, 0, 0, s, s, fmt, type, data);
  99
 100         BindRestore _bind(this);
 101         glTexImage2D(face, level, ifmt, s, s, 0, get_upload_format(fmt), type, data);
 102
 103         // XXX Allocation should be tracked per-face, but we'll run out of bits
 104         allocated |= 1<<level;
 105         if(gen_mipmap && level==0)
 106         {
 107                 // TODO Only do this once all faces are created
 108                 auto_generate_mipmap();
 109                 allocated |= (1<<get_n_levels())-1;
 110         }
 111 }
 112
 113 void TextureCube::sub_image(TextureCubeFace face, unsigned level, int x, int y, unsigned wd, unsigned ht, PixelFormat fmt, DataType type, const void *data)
 114 {
 115         if(size==0)
 116                 throw invalid_operation("TextureCube::sub_image");
 117
 118         BindRestore _bind(this);
 119         allocate(level);
 120
 121         glTexSubImage2D(face, level, x, y, wd, ht, get_upload_format(fmt), type, data);
 122
 123         if(gen_mipmap && level==0)
 124                 auto_generate_mipmap();
 125 }
 126
 127 void TextureCube::image(TextureCubeFace face, const Graphics::Image &img, bool srgb)
 128 {
 129         unsigned w = img.get_width();
 130         unsigned h = img.get_height();
 131         PixelFormat fmt = pixelformat_from_graphics(img.get_format());
 132         if(size==0)
 133         {
 134                 if(w!=h)
 135                         throw incompatible_data("TextureCube::image");
 136
 137                 storage(storage_pixelformat_from_graphics(img.get_format(), srgb), w);
 138         }
 139         else if(w!=size || h!=size)
 140                 throw incompatible_data("TextureCube::image");
 141
 142         PixelStore pstore = PixelStore::from_image(img);
 143         BindRestore _bind_ps(pstore);
 144
 145         image(face, 0, fmt, UNSIGNED_BYTE, img.get_data());
 146 }
 147
 148 void TextureCube::image(const Graphics::Image &img, bool srgb)
 149 {
 150         unsigned w = img.get_width();
 151         unsigned h = img.get_height();
 152
 153         if(h!=w*6)
 154                 throw incompatible_data("TextureCube::image");
 155         h /= 6;
 156
 157         PixelFormat fmt = pixelformat_from_graphics(img.get_format());
 158         if(size==0)
 159                 storage(storage_pixelformat_from_graphics(img.get_format(), srgb), w);
 160         else if(w!=size || h!=size)
 161                 throw incompatible_data("TextureCube::image");
 162
 163         PixelStore pstore = PixelStore::from_image(img);
 164         BindRestore _bind_ps(pstore);
 165
 166         const char *cdata = reinterpret_cast<const char *>(img.get_data());
 167         unsigned face_size = img.get_stride()*size;
 168         for(unsigned i=0; i<6; ++i)
 169                 image(enumerate_faces(i), 0, fmt, UNSIGNED_BYTE, cdata+i*face_size);
 170 }
 171
 172 unsigned TextureCube::get_n_levels() const
 173 {
 174         unsigned n = 0;
 175         for(unsigned s=size; s; s>>=1, ++n) ;
 176         return n;
 177 }
 178
 179 unsigned TextureCube::get_level_size(unsigned level) const
 180 {
 181         return size>>level;
 182 }
 183
 184 TextureCubeFace TextureCube::enumerate_faces(unsigned i)
 185 {
 186         if(i>=6)
 187                 throw out_of_range("TextureCube::enumerate_faces");
 188         return face_order[i];
 189 }
 190
 191 unsigned TextureCube::get_face_index(TextureCubeFace face)
 192 {
 193         switch(face)
 194         {
 195         case POSITIVE_X: return 0;
 196         case NEGATIVE_X: return 1;
 197         case POSITIVE_Y: return 2;
 198         case NEGATIVE_Y: return 3;
 199         case POSITIVE_Z: return 4;
 200         case NEGATIVE_Z: return 5;
 201         default: throw invalid_argument("TextureCube::get_face_index");
 202         }
 203 }
 204
 205 const Vector3 &TextureCube::get_face_direction(TextureCubeFace face)
 206 {
 207         return directions[get_face_index(face)];
 208 }
 209
 210 const Vector3 &TextureCube::get_s_direction(TextureCubeFace face)
 211 {
 212         return directions[orientations[get_face_index(face)*2]];
 213 }
 214
 215 const Vector3 &TextureCube::get_t_direction(TextureCubeFace face)
 216 {
 217         return directions[orientations[get_face_index(face)*2+1]];
 218 }
 219
 220 Vector3 TextureCube::get_texel_direction(TextureCubeFace face, unsigned u, unsigned v)
 221 {
 222         float s = (u+0.5f)*2.0f/size-1.0f;
 223         float t = (v+0.5f)*2.0f/size-1.0f;
 224         const Vector3 &fv = get_face_direction(face);
 225         const Vector3 &sv = get_s_direction(face);
 226         const Vector3 &tv = get_t_direction(face);
 227         return fv+s*sv+t*tv;
 228 }
 229
 230 UInt64 TextureCube::get_data_size() const
 231 {
 232         return id ? size*size*6*get_pixel_size(ifmt) : 0;
 233 }
 234
 235
 236 TextureCube::Loader::Loader(TextureCube &t):
 237         DataFile::DerivedObjectLoader<TextureCube, Texture::Loader>(t)
 238 {
 239         init();
 240 }
 241
 242 TextureCube::Loader::Loader(TextureCube &t, Collection &c):
 243         DataFile::DerivedObjectLoader<TextureCube, Texture::Loader>(t, c)
 244 {
 245         init();
 246 }
 247
 248 void TextureCube::Loader::init()
 249 {
 250         add("external_image", &Loader::external_image);
 251         add("image_data", &Loader::image_data);
 252         add("raw_data", &Loader::raw_data);
 253         add("storage", &Loader::storage);
 254 }
 255
 256 void TextureCube::Loader::external_image(TextureCubeFace face, const string &fn)
 257 {
 258         Graphics::Image img;
 259         RefPtr<IO::Seekable> io = get_collection().open_raw(fn);
 260         img.load_io(*io);
 261
 262         obj.image(face, img, srgb);
 263 }
 264
 265 void TextureCube::Loader::image_data(TextureCubeFace face, const string &data)
 266 {
 267         Graphics::Image img;
 268         IO::Memory mem(data.data(), data.size());
 269         img.load_io(mem);
 270
 271         obj.image(face, img, srgb);
 272 }
 273
 274 void TextureCube::Loader::raw_data(TextureCubeFace face, const string &data)
 275 {
 276         obj.image(face, 0, get_base_pixelformat(obj.ifmt), UNSIGNED_BYTE, data.data());
 277 }
 278
 279 void TextureCube::Loader::storage(PixelFormat fmt, unsigned s)
 280 {
 281         if(srgb)
 282                 fmt = get_srgb_pixelformat(fmt);
 283         obj.storage(fmt, s);
 284 }
 285
 286
 287 void operator>>(const LexicalConverter &conv, TextureCubeFace &face)
 288 {
 289         const string &str = conv.get();
 290         if(str=="POSITIVE_X")
 291                 face = POSITIVE_X;
 292         else if(str=="NEGATIVE_X")
 293                 face = NEGATIVE_X;
 294         else if(str=="POSITIVE_Y")
 295                 face = POSITIVE_Y;
 296         else if(str=="NEGATIVE_Y")
 297                 face = NEGATIVE_Y;
 298         else if(str=="POSITIVE_Z")
 299                 face = POSITIVE_Z;
 300         else if(str=="NEGATIVE_Z")
 301                 face = NEGATIVE_Z;
 302         else
 303                 throw lexical_error(format("conversion of '%s' to TextureCubeFace", str));
 304 }
 305
 306 } // namespace GL
 307 } // namespace Msp