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