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