source/texturecube.cpp

   1 #include <msp/datafile/collection.h>
   2 #include <msp/gl/extensions/arb_texture_cube_map.h>
   3 #include <msp/io/memory.h>
   4 #include <msp/strings/format.h>
   5 #include "bindable.h"
   6 #include "error.h"
   7 #include "pixelstore.h"
   8 #include "texturecube.h"
   9
  10 using namespace std;
  11
  12 namespace Msp {
  13 namespace GL {
  14
  15 Vector3 TextureCube::directions[6] =
  16 {
  17         Vector3(1, 0, 0),
  18         Vector3(-1, 0, 0),
  19         Vector3(0, 1, 0),
  20         Vector3(0, -1, 0),
  21         Vector3(0, 0, 1),
  22         Vector3(0, 0, -1)
  23 };
  24
  25 TextureCube::TextureCube():
  26         Texture(GL_TEXTURE_CUBE_MAP),
  27         ifmt(RGB),
  28         size(0),
  29         allocated(0)
  30 {
  31         static Require _req(ARB_texture_cube_map);
  32 }
  33
  34 void TextureCube::storage(PixelFormat fmt, unsigned sz)
  35 {
  36         if(size>0)
  37                 throw invalid_operation("TextureCube::storage");
  38         if(sz==0)
  39                 throw invalid_argument("TextureCube::storage");
  40
  41         if(MSP_sized_internal_formats)
  42                 fmt = get_sized_pixelformat(fmt);
  43         require_pixelformat(fmt);
  44
  45         ifmt = fmt;
  46         size = sz;
  47 }
  48
  49 void TextureCube::allocate(unsigned level)
  50 {
  51         if(allocated&(1<<level))
  52                 return;
  53
  54         PixelFormat base_fmt = get_base_pixelformat(ifmt);
  55         DataType type = get_alloc_type(base_fmt);
  56         for(unsigned i=0; i<6; ++i)
  57                 image(enumerate_faces(i), level, base_fmt, type, 0);
  58 }
  59
  60 void TextureCube::image(TextureCubeFace face, unsigned level, PixelFormat fmt, DataType type, const void *data)
  61 {
  62         if(size==0)
  63                 throw invalid_operation("TextureCube::image");
  64
  65         unsigned s = get_level_size(level);
  66         if(s==0)
  67                 throw out_of_range("TextureCube::image");
  68
  69         BindRestore _bind(this);
  70         glTexImage2D(face, level, ifmt, s, s, 0, fmt, type, data);
  71
  72         // XXX Allocation should be tracked per-face, but we'll run out of bits
  73         allocated |= 1<<level;
  74         if(gen_mipmap && level==0)
  75         {
  76                 // TODO Only do this once all faces are created
  77                 auto_generate_mipmap();
  78                 for(; s; s>>=1, ++level) ;
  79                 allocated |= (1<<level)-1;
  80         }
  81 }
  82
  83 void TextureCube::sub_image(TextureCubeFace face, unsigned level, int x, int y, unsigned wd, unsigned ht, PixelFormat fmt, DataType type, const void *data)
  84 {
  85         if(size==0)
  86                 throw invalid_operation("TextureCube::sub_image");
  87
  88         allocate(level);
  89
  90         BindRestore _bind(this);
  91         glTexSubImage2D(face, level, x, y, wd, ht, fmt, type, data);
  92 }
  93
  94 void TextureCube::image(TextureCubeFace face, const Graphics::Image &img, bool srgb)
  95 {
  96         unsigned w = img.get_width();
  97         unsigned h = img.get_height();
  98         PixelFormat fmt = pixelformat_from_graphics(img.get_format());
  99         if(size==0)
 100         {
 101                 if(w!=h)
 102                         throw incompatible_data("TextureCube::image");
 103
 104                 storage(storage_pixelformat_from_graphics(img.get_format(), srgb), w);
 105         }
 106         else if(w!=size || h!=size)
 107                 throw incompatible_data("TextureCube::image");
 108
 109         PixelStore pstore = PixelStore::from_image(img);
 110         BindRestore _bind_ps(pstore);
 111
 112         image(face, 0, fmt, UNSIGNED_BYTE, img.get_data());
 113 }
 114
 115 void TextureCube::image(const Graphics::Image &img, bool srgb)
 116 {
 117         unsigned w = img.get_width();
 118         unsigned h = img.get_height();
 119
 120         if(h!=w*6)
 121                 throw incompatible_data("TextureCube::image");
 122         h /= 6;
 123
 124         PixelFormat fmt = pixelformat_from_graphics(img.get_format());
 125         if(size==0)
 126                 storage(storage_pixelformat_from_graphics(img.get_format(), srgb), w);
 127         else if(w!=size || h!=size)
 128                 throw incompatible_data("TextureCube::image");
 129
 130         PixelStore pstore = PixelStore::from_image(img);
 131         BindRestore _bind_ps(pstore);
 132
 133         const char *cdata = reinterpret_cast<const char *>(img.get_data());
 134         unsigned face_size = img.get_stride()*size;
 135         for(unsigned i=0; i<6; ++i)
 136                 image(enumerate_faces(i), 0, fmt, UNSIGNED_BYTE, cdata+i*face_size);
 137 }
 138
 139 unsigned TextureCube::get_level_size(unsigned level)
 140 {
 141         return size>>level;
 142 }
 143
 144 TextureCubeFace TextureCube::enumerate_faces(unsigned i)
 145 {
 146         switch(i)
 147         {
 148         case 0: return POSITIVE_X;
 149         case 1: return NEGATIVE_X;
 150         case 2: return POSITIVE_Y;
 151         case 3: return NEGATIVE_Y;
 152         case 4: return POSITIVE_Z;
 153         case 5: return NEGATIVE_Z;
 154         default: throw out_of_range("TextureCube::enumerate_faces");
 155         }
 156 }
 157
 158 const Vector3 &TextureCube::get_face_direction(TextureCubeFace face)
 159 {
 160         switch(face)
 161         {
 162         case POSITIVE_X: return directions[0];
 163         case NEGATIVE_X: return directions[1];
 164         case POSITIVE_Y: return directions[2];
 165         case NEGATIVE_Y: return directions[3];
 166         case POSITIVE_Z: return directions[4];
 167         case NEGATIVE_Z: return directions[5];
 168         default: throw invalid_argument("TextureCube::get_face_direction");
 169         }
 170 }
 171
 172 const Vector3 &TextureCube::get_s_direction(TextureCubeFace face)
 173 {
 174         switch(face)
 175         {
 176         case POSITIVE_X: return directions[5];
 177         case NEGATIVE_X: return directions[4];
 178         case POSITIVE_Y: return directions[0];
 179         case NEGATIVE_Y: return directions[0];
 180         case POSITIVE_Z: return directions[0];
 181         case NEGATIVE_Z: return directions[1];
 182         default: throw invalid_argument("TextureCube::get_s_direction");
 183         }
 184 }
 185
 186 const Vector3 &TextureCube::get_t_direction(TextureCubeFace face)
 187 {
 188         switch(face)
 189         {
 190         case POSITIVE_X: return directions[3];
 191         case NEGATIVE_X: return directions[3];
 192         case POSITIVE_Y: return directions[4];
 193         case NEGATIVE_Y: return directions[5];
 194         case POSITIVE_Z: return directions[3];
 195         case NEGATIVE_Z: return directions[3];
 196         default: throw invalid_argument("TextureCube::get_t_direction");
 197         }
 198 }
 199
 200 Vector3 TextureCube::get_texel_direction(TextureCubeFace face, unsigned u, unsigned v)
 201 {
 202         float s = (u+0.5f)*2.0f/size-1.0f;
 203         float t = (v+0.5f)*2.0f/size-1.0f;
 204         const Vector3 &fv = get_face_direction(face);
 205         const Vector3 &sv = get_s_direction(face);
 206         const Vector3 &tv = get_t_direction(face);
 207         return fv+s*sv+t*tv;
 208 }
 209
 210 UInt64 TextureCube::get_data_size() const
 211 {
 212         return id ? size*size*6*get_pixel_size(ifmt) : 0;
 213 }
 214
 215
 216 TextureCube::Loader::Loader(TextureCube &t):
 217         DataFile::DerivedObjectLoader<TextureCube, Texture::Loader>(t)
 218 {
 219         init();
 220 }
 221
 222 TextureCube::Loader::Loader(TextureCube &t, Collection &c):
 223         DataFile::DerivedObjectLoader<TextureCube, Texture::Loader>(t, c)
 224 {
 225         init();
 226 }
 227
 228 void TextureCube::Loader::init()
 229 {
 230         add("external_image", &Loader::external_image);
 231         add("image_data", &Loader::image_data);
 232         add("raw_data", &Loader::raw_data);
 233         add("storage", &Loader::storage);
 234 }
 235
 236 void TextureCube::Loader::external_image(TextureCubeFace face, const string &fn)
 237 {
 238         Graphics::Image img;
 239         RefPtr<IO::Seekable> io = get_collection().open_raw(fn);
 240         img.load_io(*io);
 241
 242         obj.image(face, img, srgb);
 243 }
 244
 245 void TextureCube::Loader::image_data(TextureCubeFace face, const string &data)
 246 {
 247         Graphics::Image img;
 248         IO::Memory mem(data.data(), data.size());
 249         img.load_io(mem);
 250
 251         obj.image(face, img, srgb);
 252 }
 253
 254 void TextureCube::Loader::raw_data(TextureCubeFace face, const string &data)
 255 {
 256         obj.image(face, 0, get_base_pixelformat(obj.ifmt), UNSIGNED_BYTE, data.data());
 257 }
 258
 259 void TextureCube::Loader::storage(PixelFormat fmt, unsigned s)
 260 {
 261         if(srgb)
 262                 fmt = get_srgb_pixelformat(fmt);
 263         obj.storage(fmt, s);
 264 }
 265
 266
 267 void operator>>(const LexicalConverter &conv, TextureCubeFace &face)
 268 {
 269         const string &str = conv.get();
 270         if(str=="POSITIVE_X")
 271                 face = POSITIVE_X;
 272         else if(str=="NEGATIVE_X")
 273                 face = NEGATIVE_X;
 274         else if(str=="POSITIVE_Y")
 275                 face = POSITIVE_Y;
 276         else if(str=="NEGATIVE_Y")
 277                 face = NEGATIVE_Y;
 278         else if(str=="POSITIVE_Z")
 279                 face = POSITIVE_Z;
 280         else if(str=="NEGATIVE_Z")
 281                 face = NEGATIVE_Z;
 282         else
 283                 throw lexical_error(format("conversion of '%s' to TextureCubeFace", str));
 284 }
 285
 286 } // namespace GL
 287 } // namespace Msp