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