source/core/texturecube.cpp

   1 #include <msp/datafile/collection.h>
   2 #include <msp/io/memory.h>
   3 #include <msp/strings/format.h>
   4 #include "error.h"
   5 #include "texturecube.h"
   6
   7 using namespace std;
   8
   9 namespace Msp {
  10 namespace GL {
  11
  12 const Vector3 TextureCube::directions[6] =
  13 {
  14         Vector3(1, 0, 0),
  15         Vector3(-1, 0, 0),
  16         Vector3(0, 1, 0),
  17         Vector3(0, -1, 0),
  18         Vector3(0, 0, 1),
  19         Vector3(0, 0, -1)
  20 };
  21
  22 const unsigned TextureCube::orientations[12] =
  23 {
  24         5, 3,
  25         4, 3,
  26         0, 4,
  27         0, 5,
  28         0, 3,
  29         1, 3
  30 };
  31
  32 void TextureCube::storage(PixelFormat fmt, unsigned sz, unsigned lv)
  33 {
  34         if(size>0)
  35         {
  36                 if(fmt!=format || sz!=size || (lv && lv!=levels))
  37                         throw incompatible_data("TextureCube::storage");
  38                 return;
  39         }
  40         if(sz==0)
  41                 throw invalid_argument("TextureCube::storage");
  42
  43         set_format(fmt);
  44         size = sz;
  45         levels = get_n_levels();
  46         if(lv>0)
  47                 levels = min(levels, lv);
  48
  49         allocate();
  50 }
  51
  52 void TextureCube::image(TextureCubeFace face, unsigned level, const void *data)
  53 {
  54         unsigned lsz = get_level_size(level);
  55         return sub_image(face, level, 0, 0, lsz, lsz, data);
  56 }
  57
  58 void TextureCube::sub_image(TextureCubeFace face, unsigned level, int x, int y, unsigned wd, unsigned ht, const void *data)
  59 {
  60         if(size==0)
  61                 throw invalid_operation("TextureCube::sub_image");
  62         if(level>=levels)
  63                 throw out_of_range("TextureCube::sub_image");
  64
  65         TextureCubeBackend::sub_image(face, level, x, y, wd, ht, data);
  66 }
  67
  68 void TextureCube::image(TextureCubeFace face, const Graphics::Image &img)
  69 {
  70         unsigned w = img.get_width();
  71         unsigned h = img.get_height();
  72         if(w!=h)
  73                 throw incompatible_data("TextureCube::image");
  74
  75         storage(pixelformat_from_image(img, use_srgb_format), w);
  76         image(face, 0, img.get_pixels());
  77 }
  78
  79 void TextureCube::image(const Graphics::Image &img, unsigned lv)
  80 {
  81         unsigned w = img.get_width();
  82         unsigned h = img.get_height();
  83
  84         if(h!=w*6)
  85                 throw incompatible_data("TextureCube::image");
  86         h /= 6;
  87
  88         if(size==0)
  89                 storage(pixelformat_from_image(img, use_srgb_format), w, lv);
  90         else if(w!=size || h!=size)
  91                 throw incompatible_data("TextureCube::image");
  92
  93         const char *pixels = reinterpret_cast<const char *>(img.get_pixels());
  94         unsigned face_size = img.get_stride()*size;
  95         for(unsigned i=0; i<6; ++i)
  96                 image(static_cast<TextureCubeFace>(i), 0, pixels+i*face_size);
  97 }
  98
  99 unsigned TextureCube::get_n_levels() const
 100 {
 101         unsigned n = 0;
 102         for(unsigned s=size; s; s>>=1, ++n) ;
 103         return n;
 104 }
 105
 106 unsigned TextureCube::get_level_size(unsigned level) const
 107 {
 108         return size>>level;
 109 }
 110
 111 const Vector3 &TextureCube::get_face_direction(TextureCubeFace face)
 112 {
 113         return directions[face];
 114 }
 115
 116 const Vector3 &TextureCube::get_s_direction(TextureCubeFace face)
 117 {
 118         return directions[orientations[face*2]];
 119 }
 120
 121 const Vector3 &TextureCube::get_t_direction(TextureCubeFace face)
 122 {
 123         return directions[orientations[face*2+1]];
 124 }
 125
 126 Vector3 TextureCube::get_texel_direction(TextureCubeFace face, unsigned u, unsigned v)
 127 {
 128         float s = (u+0.5f)*2.0f/size-1.0f;
 129         float t = (v+0.5f)*2.0f/size-1.0f;
 130         const Vector3 &fv = get_face_direction(face);
 131         const Vector3 &sv = get_s_direction(face);
 132         const Vector3 &tv = get_t_direction(face);
 133         return fv+s*sv+t*tv;
 134 }
 135
 136 uint64_t TextureCube::get_data_size() const
 137 {
 138         return id ? size*size*6*get_pixel_size(storage_fmt) : 0;
 139 }
 140
 141
 142 TextureCube::Loader::Loader(TextureCube &t):
 143         DataFile::DerivedObjectLoader<TextureCube, Texture::Loader>(t)
 144 {
 145         init();
 146 }
 147
 148 TextureCube::Loader::Loader(TextureCube &t, Collection &c):
 149         DataFile::DerivedObjectLoader<TextureCube, Texture::Loader>(t, c)
 150 {
 151         init();
 152 }
 153
 154 void TextureCube::Loader::init()
 155 {
 156         add("external_image", &Loader::external_image);
 157         add("image_data", &Loader::image_data);
 158         add("raw_data", &Loader::raw_data);
 159         add("storage", &Loader::storage);
 160         add("storage", &Loader::storage_levels);
 161 }
 162
 163 void TextureCube::Loader::external_image(TextureCubeFace face, const string &fn)
 164 {
 165         Graphics::Image img;
 166         RefPtr<IO::Seekable> io = get_collection().open_raw(fn);
 167         img.load_io(*io);
 168
 169         obj.image(face, img);
 170 }
 171
 172 void TextureCube::Loader::image_data(TextureCubeFace face, const string &data)
 173 {
 174         Graphics::Image img;
 175         IO::Memory mem(data.data(), data.size());
 176         img.load_io(mem);
 177
 178         obj.image(face, img);
 179 }
 180
 181 void TextureCube::Loader::raw_data(TextureCubeFace face, const string &data)
 182 {
 183         obj.image(face, 0, data.data());
 184 }
 185
 186 void TextureCube::Loader::storage(PixelFormat fmt, unsigned s)
 187 {
 188         obj.storage(fmt, s);
 189 }
 190
 191 void TextureCube::Loader::storage_levels(PixelFormat fmt, unsigned s, unsigned l)
 192 {
 193         obj.storage(fmt, s, l);
 194 }
 195
 196
 197 void operator>>(const LexicalConverter &conv, TextureCubeFace &face)
 198 {
 199         const string &str = conv.get();
 200         if(str=="POSITIVE_X")
 201                 face = POSITIVE_X;
 202         else if(str=="NEGATIVE_X")
 203                 face = NEGATIVE_X;
 204         else if(str=="POSITIVE_Y")
 205                 face = POSITIVE_Y;
 206         else if(str=="NEGATIVE_Y")
 207                 face = NEGATIVE_Y;
 208         else if(str=="POSITIVE_Z")
 209                 face = POSITIVE_Z;
 210         else if(str=="NEGATIVE_Z")
 211                 face = NEGATIVE_Z;
 212         else
 213                 throw lexical_error(format("conversion of '%s' to TextureCubeFace", str));
 214 }
 215
 216 } // namespace GL
 217 } // namespace Msp