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::image(TextureCubeFace face, const Graphics::Image &img, bool srgb)
  84 {
  85         unsigned w = img.get_width();
  86         unsigned h = img.get_height();
  87         PixelFormat fmt = pixelformat_from_graphics(img.get_format());
  88         if(size==0)
  89         {
  90                 if(w!=h)
  91                         throw incompatible_data("TextureCube::image");
  92
  93                 storage(storage_pixelformat_from_graphics(img.get_format(), srgb), w);
  94         }
  95         else if(w!=size || h!=size)
  96                 throw incompatible_data("TextureCube::image");
  97
  98         PixelStore pstore = PixelStore::from_image(img);
  99         BindRestore _bind_ps(pstore);
 100
 101         image(face, 0, fmt, UNSIGNED_BYTE, img.get_data());
 102 }
 103
 104 void TextureCube::image(const Graphics::Image &img, bool srgb)
 105 {
 106         unsigned w = img.get_width();
 107         unsigned h = img.get_height();
 108
 109         if(h!=w*6)
 110                 throw incompatible_data("TextureCube::image");
 111         h /= 6;
 112
 113         PixelFormat fmt = pixelformat_from_graphics(img.get_format());
 114         if(size==0)
 115                 storage(storage_pixelformat_from_graphics(img.get_format(), srgb), w);
 116         else if(w!=size || h!=size)
 117                 throw incompatible_data("TextureCube::image");
 118
 119         PixelStore pstore = PixelStore::from_image(img);
 120         BindRestore _bind_ps(pstore);
 121
 122         const char *cdata = reinterpret_cast<const char *>(img.get_data());
 123         unsigned face_size = img.get_stride()*size;
 124         for(unsigned i=0; i<6; ++i)
 125                 image(enumerate_faces(i), 0, fmt, UNSIGNED_BYTE, cdata+i*face_size);
 126 }
 127
 128 unsigned TextureCube::get_level_size(unsigned level)
 129 {
 130         return size>>level;
 131 }
 132
 133 TextureCubeFace TextureCube::enumerate_faces(unsigned i)
 134 {
 135         switch(i)
 136         {
 137         case 0: return POSITIVE_X;
 138         case 1: return NEGATIVE_X;
 139         case 2: return POSITIVE_Y;
 140         case 3: return NEGATIVE_Y;
 141         case 4: return POSITIVE_Z;
 142         case 5: return NEGATIVE_Z;
 143         default: throw out_of_range("TextureCube::enumerate_faces");
 144         }
 145 }
 146
 147 const Vector3 &TextureCube::get_face_direction(TextureCubeFace face)
 148 {
 149         switch(face)
 150         {
 151         case POSITIVE_X: return directions[0];
 152         case NEGATIVE_X: return directions[1];
 153         case POSITIVE_Y: return directions[2];
 154         case NEGATIVE_Y: return directions[3];
 155         case POSITIVE_Z: return directions[4];
 156         case NEGATIVE_Z: return directions[5];
 157         default: throw invalid_argument("TextureCube::get_face_direction");
 158         }
 159 }
 160
 161 const Vector3 &TextureCube::get_s_direction(TextureCubeFace face)
 162 {
 163         switch(face)
 164         {
 165         case POSITIVE_X: return directions[5];
 166         case NEGATIVE_X: return directions[4];
 167         case POSITIVE_Y: return directions[0];
 168         case NEGATIVE_Y: return directions[0];
 169         case POSITIVE_Z: return directions[0];
 170         case NEGATIVE_Z: return directions[1];
 171         default: throw invalid_argument("TextureCube::get_s_direction");
 172         }
 173 }
 174
 175 const Vector3 &TextureCube::get_t_direction(TextureCubeFace face)
 176 {
 177         switch(face)
 178         {
 179         case POSITIVE_X: return directions[3];
 180         case NEGATIVE_X: return directions[3];
 181         case POSITIVE_Y: return directions[4];
 182         case NEGATIVE_Y: return directions[5];
 183         case POSITIVE_Z: return directions[3];
 184         case NEGATIVE_Z: return directions[3];
 185         default: throw invalid_argument("TextureCube::get_t_direction");
 186         }
 187 }
 188
 189 Vector3 TextureCube::get_texel_direction(TextureCubeFace face, unsigned u, unsigned v)
 190 {
 191         float s = (u+0.5f)*2.0f/size-1.0f;
 192         float t = (v+0.5f)*2.0f/size-1.0f;
 193         const Vector3 &fv = get_face_direction(face);
 194         const Vector3 &sv = get_s_direction(face);
 195         const Vector3 &tv = get_t_direction(face);
 196         return fv+s*sv+t*tv;
 197 }
 198
 199 UInt64 TextureCube::get_data_size() const
 200 {
 201         return id ? size*size*6*get_pixel_size(ifmt) : 0;
 202 }
 203
 204
 205 TextureCube::Loader::Loader(TextureCube &t):
 206         DataFile::DerivedObjectLoader<TextureCube, Texture::Loader>(t)
 207 {
 208         init();
 209 }
 210
 211 TextureCube::Loader::Loader(TextureCube &t, Collection &c):
 212         DataFile::DerivedObjectLoader<TextureCube, Texture::Loader>(t, c)
 213 {
 214         init();
 215 }
 216
 217 void TextureCube::Loader::init()
 218 {
 219         add("external_image", &Loader::external_image);
 220         add("image_data", &Loader::image_data);
 221         add("raw_data", &Loader::raw_data);
 222         add("storage", &Loader::storage);
 223 }
 224
 225 void TextureCube::Loader::external_image(TextureCubeFace face, const string &fn)
 226 {
 227         Graphics::Image img;
 228         RefPtr<IO::Seekable> io = get_collection().open_raw(fn);
 229         img.load_io(*io);
 230
 231         obj.image(face, img, srgb);
 232 }
 233
 234 void TextureCube::Loader::image_data(TextureCubeFace face, const string &data)
 235 {
 236         Graphics::Image img;
 237         IO::Memory mem(data.data(), data.size());
 238         img.load_io(mem);
 239
 240         obj.image(face, img, srgb);
 241 }
 242
 243 void TextureCube::Loader::raw_data(TextureCubeFace face, const string &data)
 244 {
 245         obj.image(face, 0, get_base_pixelformat(obj.ifmt), UNSIGNED_BYTE, data.data());
 246 }
 247
 248 void TextureCube::Loader::storage(PixelFormat fmt, unsigned s)
 249 {
 250         if(srgb)
 251                 fmt = get_srgb_pixelformat(fmt);
 252         obj.storage(fmt, s);
 253 }
 254
 255
 256 void operator>>(const LexicalConverter &conv, TextureCubeFace &face)
 257 {
 258         const string &str = conv.get();
 259         if(str=="POSITIVE_X")
 260                 face = POSITIVE_X;
 261         else if(str=="NEGATIVE_X")
 262                 face = NEGATIVE_X;
 263         else if(str=="POSITIVE_Y")
 264                 face = POSITIVE_Y;
 265         else if(str=="NEGATIVE_Y")
 266                 face = NEGATIVE_Y;
 267         else if(str=="POSITIVE_Z")
 268                 face = POSITIVE_Z;
 269         else if(str=="NEGATIVE_Z")
 270                 face = NEGATIVE_Z;
 271         else
 272                 throw lexical_error(format("conversion of '%s' to TextureCubeFace", str));
 273 }
 274
 275 } // namespace GL
 276 } // namespace Msp