source/core/texturecube.cpp

   1 #include <msp/datafile/collection.h>
   2 #include <msp/gl/extensions/arb_direct_state_access.h>
   3 #include <msp/gl/extensions/arb_seamless_cube_map.h>
   4 #include <msp/gl/extensions/arb_texture_cube_map.h>
   5 #include <msp/gl/extensions/arb_texture_storage.h>
   6 #include <msp/io/memory.h>
   7 #include <msp/strings/format.h>
   8 #include "error.h"
   9 #include "texturecube.h"
  10
  11 using namespace std;
  12
  13 namespace Msp {
  14 namespace GL {
  15
  16 TextureCubeFace TextureCube::face_order[6] =
  17 {
  18         POSITIVE_X,
  19         NEGATIVE_X,
  20         POSITIVE_Y,
  21         NEGATIVE_Y,
  22         POSITIVE_Z,
  23         NEGATIVE_Z
  24 };
  25
  26 Vector3 TextureCube::directions[6] =
  27 {
  28         Vector3(1, 0, 0),
  29         Vector3(-1, 0, 0),
  30         Vector3(0, 1, 0),
  31         Vector3(0, -1, 0),
  32         Vector3(0, 0, 1),
  33         Vector3(0, 0, -1)
  34 };
  35
  36 unsigned TextureCube::orientations[12] =
  37 {
  38         5, 3,
  39         4, 3,
  40         0, 4,
  41         0, 5,
  42         0, 3,
  43         1, 3
  44 };
  45
  46 TextureCube::TextureCube():
  47         Texture(GL_TEXTURE_CUBE_MAP),
  48         size(0)
  49 {
  50         static Require _req(ARB_texture_cube_map);
  51         if(ARB_seamless_cube_map)
  52                 glEnable(GL_TEXTURE_CUBE_MAP_SEAMLESS);
  53 }
  54
  55 void TextureCube::storage(PixelFormat fmt, unsigned sz, unsigned lv)
  56 {
  57         if(size>0)
  58         {
  59                 if(fmt!=format || sz!=size || (lv && lv!=levels))
  60                         throw incompatible_data("TextureCube::storage");
  61                 return;
  62         }
  63         if(sz==0)
  64                 throw invalid_argument("TextureCube::storage");
  65
  66         set_format(fmt);
  67         size = sz;
  68         levels = get_n_levels();
  69         if(lv>0)
  70                 levels = min(levels, lv);
  71
  72         GLenum gl_fmt = get_gl_pixelformat(storage_fmt);
  73         if(ARB_texture_storage)
  74         {
  75                 if(ARB_direct_state_access)
  76                         glTextureStorage2D(id, levels, gl_fmt, size, size);
  77                 else
  78                 {
  79                         bind_scratch();
  80                         glTexStorage2D(target, levels, gl_fmt, size, size);
  81                 }
  82         }
  83         else
  84         {
  85                 bind_scratch();
  86                 GLenum comp = get_gl_components(get_components(storage_fmt));
  87                 GLenum type = get_gl_type(get_component_type(storage_fmt));
  88                 for(unsigned i=0; i<levels; ++i)
  89                 {
  90                         unsigned lv_size = get_level_size(i);
  91                         for(unsigned j=0; j<6; ++j)
  92                                 glTexImage2D(enumerate_faces(j), i, gl_fmt, lv_size, lv_size, 0, comp, type, 0);
  93                 }
  94                 glTexParameteri(target, GL_TEXTURE_MAX_LEVEL, levels-1);
  95         }
  96
  97         apply_swizzle();
  98 }
  99
 100 void TextureCube::image(TextureCubeFace face, unsigned level, const void *data)
 101 {
 102         unsigned lsz = get_level_size(level);
 103         return sub_image(face, level, 0, 0, lsz, lsz, data);
 104 }
 105
 106 void TextureCube::sub_image(TextureCubeFace face, unsigned level, int x, int y, unsigned wd, unsigned ht, const void *data)
 107 {
 108         if(size==0)
 109                 throw invalid_operation("TextureCube::sub_image");
 110         if(level>=levels)
 111                 throw out_of_range("TextureCube::sub_image");
 112
 113         GLenum comp = get_gl_components(get_components(storage_fmt));
 114         GLenum type = get_gl_type(get_component_type(storage_fmt));
 115         if(ARB_direct_state_access)
 116                 glTextureSubImage3D(id, level, x, y, get_face_index(face), wd, ht, 1, comp, type, data);
 117         else
 118         {
 119                 bind_scratch();
 120                 glTexSubImage2D(face, level, x, y, wd, ht, comp, type, data);
 121         }
 122 }
 123
 124 void TextureCube::image(TextureCubeFace face, const Graphics::Image &img)
 125 {
 126         unsigned w = img.get_width();
 127         unsigned h = img.get_height();
 128         if(w!=h)
 129                 throw incompatible_data("TextureCube::image");
 130
 131         PixelFormat fmt = pixelformat_from_image(img);
 132         storage(make_pixelformat(get_components(fmt), get_component_type(fmt), use_srgb_format), w);
 133
 134         image(face, 0, img.get_pixels());
 135 }
 136
 137 void TextureCube::image(const Graphics::Image &img, unsigned lv)
 138 {
 139         unsigned w = img.get_width();
 140         unsigned h = img.get_height();
 141
 142         if(h!=w*6)
 143                 throw incompatible_data("TextureCube::image");
 144         h /= 6;
 145
 146         PixelFormat fmt = pixelformat_from_image(img);
 147         if(size==0)
 148                 storage(make_pixelformat(get_components(fmt), get_component_type(fmt), use_srgb_format), w, lv);
 149         else if(w!=size || h!=size)
 150                 throw incompatible_data("TextureCube::image");
 151
 152         const char *pixels = reinterpret_cast<const char *>(img.get_pixels());
 153         unsigned face_size = img.get_stride()*size;
 154         for(unsigned i=0; i<6; ++i)
 155                 image(enumerate_faces(i), 0, pixels+i*face_size);
 156 }
 157
 158 unsigned TextureCube::get_n_levels() const
 159 {
 160         unsigned n = 0;
 161         for(unsigned s=size; s; s>>=1, ++n) ;
 162         return n;
 163 }
 164
 165 unsigned TextureCube::get_level_size(unsigned level) const
 166 {
 167         return size>>level;
 168 }
 169
 170 TextureCubeFace TextureCube::enumerate_faces(unsigned i)
 171 {
 172         if(i>=6)
 173                 throw out_of_range("TextureCube::enumerate_faces");
 174         return face_order[i];
 175 }
 176
 177 unsigned TextureCube::get_face_index(TextureCubeFace face)
 178 {
 179         switch(face)
 180         {
 181         case POSITIVE_X: return 0;
 182         case NEGATIVE_X: return 1;
 183         case POSITIVE_Y: return 2;
 184         case NEGATIVE_Y: return 3;
 185         case POSITIVE_Z: return 4;
 186         case NEGATIVE_Z: return 5;
 187         default: throw invalid_argument("TextureCube::get_face_index");
 188         }
 189 }
 190
 191 const Vector3 &TextureCube::get_face_direction(TextureCubeFace face)
 192 {
 193         return directions[get_face_index(face)];
 194 }
 195
 196 const Vector3 &TextureCube::get_s_direction(TextureCubeFace face)
 197 {
 198         return directions[orientations[get_face_index(face)*2]];
 199 }
 200
 201 const Vector3 &TextureCube::get_t_direction(TextureCubeFace face)
 202 {
 203         return directions[orientations[get_face_index(face)*2+1]];
 204 }
 205
 206 Vector3 TextureCube::get_texel_direction(TextureCubeFace face, unsigned u, unsigned v)
 207 {
 208         float s = (u+0.5f)*2.0f/size-1.0f;
 209         float t = (v+0.5f)*2.0f/size-1.0f;
 210         const Vector3 &fv = get_face_direction(face);
 211         const Vector3 &sv = get_s_direction(face);
 212         const Vector3 &tv = get_t_direction(face);
 213         return fv+s*sv+t*tv;
 214 }
 215
 216 uint64_t TextureCube::get_data_size() const
 217 {
 218         return id ? size*size*6*get_pixel_size(storage_fmt) : 0;
 219 }
 220
 221
 222 TextureCube::Loader::Loader(TextureCube &t):
 223         DataFile::DerivedObjectLoader<TextureCube, Texture::Loader>(t)
 224 {
 225         init();
 226 }
 227
 228 TextureCube::Loader::Loader(TextureCube &t, Collection &c):
 229         DataFile::DerivedObjectLoader<TextureCube, Texture::Loader>(t, c)
 230 {
 231         init();
 232 }
 233
 234 void TextureCube::Loader::init()
 235 {
 236         add("external_image", &Loader::external_image);
 237         add("image_data", &Loader::image_data);
 238         add("raw_data", &Loader::raw_data);
 239         add("storage", &Loader::storage);
 240         add("storage", &Loader::storage_levels);
 241 }
 242
 243 void TextureCube::Loader::external_image(TextureCubeFace face, const string &fn)
 244 {
 245         Graphics::Image img;
 246         RefPtr<IO::Seekable> io = get_collection().open_raw(fn);
 247         img.load_io(*io);
 248
 249         obj.image(face, img);
 250 }
 251
 252 void TextureCube::Loader::image_data(TextureCubeFace face, const string &data)
 253 {
 254         Graphics::Image img;
 255         IO::Memory mem(data.data(), data.size());
 256         img.load_io(mem);
 257
 258         obj.image(face, img);
 259 }
 260
 261 void TextureCube::Loader::raw_data(TextureCubeFace face, const string &data)
 262 {
 263         obj.image(face, 0, data.data());
 264 }
 265
 266 void TextureCube::Loader::storage(PixelFormat fmt, unsigned s)
 267 {
 268         obj.storage(fmt, s);
 269 }
 270
 271 void TextureCube::Loader::storage_levels(PixelFormat fmt, unsigned s, unsigned l)
 272 {
 273         obj.storage(fmt, s, l);
 274 }
 275
 276
 277 void operator>>(const LexicalConverter &conv, TextureCubeFace &face)
 278 {
 279         const string &str = conv.get();
 280         if(str=="POSITIVE_X")
 281                 face = POSITIVE_X;
 282         else if(str=="NEGATIVE_X")
 283                 face = NEGATIVE_X;
 284         else if(str=="POSITIVE_Y")
 285                 face = POSITIVE_Y;
 286         else if(str=="NEGATIVE_Y")
 287                 face = NEGATIVE_Y;
 288         else if(str=="POSITIVE_Z")
 289                 face = POSITIVE_Z;
 290         else if(str=="NEGATIVE_Z")
 291                 face = NEGATIVE_Z;
 292         else
 293                 throw lexical_error(format("conversion of '%s' to TextureCubeFace", str));
 294 }
 295
 296 } // namespace GL
 297 } // namespace Msp