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