source/texturecube.cpp

   1 #include <msp/gl/extensions/arb_texture_cube_map.h>
   2 #include <msp/io/memory.h>
   3 #include <msp/strings/format.h>
   4 #include "bindable.h"
   5 #include "error.h"
   6 #include "pixelstore.h"
   7 #include "texturecube.h"
   8
   9 using namespace std;
  10
  11 namespace Msp {
  12 namespace GL {
  13
  14 Vector3 TextureCube::directions[6] =
  15 {
  16         Vector3(1, 0, 0),
  17         Vector3(-1, 0, 0),
  18         Vector3(0, 1, 0),
  19         Vector3(0, -1, 0),
  20         Vector3(0, 0, 1),
  21         Vector3(0, 0, -1)
  22 };
  23
  24 TextureCube::TextureCube():
  25         Texture(GL_TEXTURE_CUBE_MAP),
  26         ifmt(RGB),
  27         size(0),
  28         allocated(0)
  29 {
  30         static Require _req(ARB_texture_cube_map);
  31 }
  32
  33 void TextureCube::storage(PixelFormat fmt, unsigned sz)
  34 {
  35         if(size>0)
  36                 throw invalid_operation("TextureCube::storage");
  37         if(sz==0)
  38                 throw invalid_argument("TextureCube::storage");
  39         require_pixelformat(fmt);
  40
  41         ifmt = fmt;
  42         size = sz;
  43 }
  44
  45 void TextureCube::allocate(unsigned level)
  46 {
  47         if(allocated&(1<<level))
  48                 return;
  49
  50         PixelFormat base_fmt = get_base_pixelformat(ifmt);
  51         DataType type = get_alloc_type(base_fmt);
  52         for(unsigned i=0; i<6; ++i)
  53                 image(enumerate_faces(i), level, base_fmt, type, 0);
  54 }
  55
  56 void TextureCube::image(TextureCubeFace face, unsigned level, PixelFormat fmt, DataType type, const void *data)
  57 {
  58         if(size==0)
  59                 throw invalid_operation("TextureCube::image");
  60
  61         unsigned s = get_level_size(level);
  62         if(s==0)
  63                 throw out_of_range("TextureCube::image");
  64
  65         BindRestore _bind(this);
  66         glTexImage2D(face, level, ifmt, s, s, 0, fmt, type, data);
  67
  68         // XXX Allocation should be tracked per-face, but we'll run out of bits
  69         allocated |= 1<<level;
  70         if(gen_mipmap && level==0)
  71         {
  72                 // TODO Only do this once all faces are created
  73                 auto_generate_mipmap();
  74                 for(; s; s>>=1, ++level) ;
  75                 allocated |= (1<<level)-1;
  76         }
  77 }
  78
  79 void TextureCube::image(TextureCubeFace face, const Graphics::Image &img, bool srgb)
  80 {
  81         unsigned w = img.get_width();
  82         unsigned h = img.get_height();
  83         PixelFormat fmt = pixelformat_from_graphics(img.get_format());
  84         if(size==0)
  85         {
  86                 if(w!=h)
  87                         throw incompatible_data("TextureCube::image");
  88
  89                 storage(storage_pixelformat_from_graphics(img.get_format(), srgb), w);
  90         }
  91         else if(w!=size || h!=size)
  92                 throw incompatible_data("TextureCube::image");
  93
  94         PixelStore pstore = PixelStore::from_image(img);
  95         BindRestore _bind_ps(pstore);
  96
  97         image(face, 0, fmt, UNSIGNED_BYTE, img.get_data());
  98 }
  99
 100 void TextureCube::image(const Graphics::Image &img, bool srgb)
 101 {
 102         unsigned w = img.get_width();
 103         unsigned h = img.get_height();
 104
 105         if(h!=w*6)
 106                 throw incompatible_data("TextureCube::image");
 107         h /= 6;
 108
 109         PixelFormat fmt = pixelformat_from_graphics(img.get_format());
 110         if(size==0)
 111                 storage(storage_pixelformat_from_graphics(img.get_format(), srgb), w);
 112         else if(w!=size || h!=size)
 113                 throw incompatible_data("TextureCube::image");
 114
 115         PixelStore pstore = PixelStore::from_image(img);
 116         BindRestore _bind_ps(pstore);
 117
 118         const char *cdata = reinterpret_cast<const char *>(img.get_data());
 119         unsigned face_size = img.get_stride()*size;
 120         for(unsigned i=0; i<6; ++i)
 121                 image(enumerate_faces(i), 0, fmt, UNSIGNED_BYTE, cdata+i*face_size);
 122 }
 123
 124 unsigned TextureCube::get_level_size(unsigned level)
 125 {
 126         return size>>level;
 127 }
 128
 129 TextureCubeFace TextureCube::enumerate_faces(unsigned i)
 130 {
 131         switch(i)
 132         {
 133         case 0: return POSITIVE_X;
 134         case 1: return NEGATIVE_X;
 135         case 2: return POSITIVE_Y;
 136         case 3: return NEGATIVE_Y;
 137         case 4: return POSITIVE_Z;
 138         case 5: return NEGATIVE_Z;
 139         default: throw out_of_range("TextureCube::enumerate_faces");
 140         }
 141 }
 142
 143 const Vector3 &TextureCube::get_face_direction(TextureCubeFace face)
 144 {
 145         switch(face)
 146         {
 147         case POSITIVE_X: return directions[0];
 148         case NEGATIVE_X: return directions[1];
 149         case POSITIVE_Y: return directions[2];
 150         case NEGATIVE_Y: return directions[3];
 151         case POSITIVE_Z: return directions[4];
 152         case NEGATIVE_Z: return directions[5];
 153         default: throw invalid_argument("TextureCube::get_face_direction");
 154         }
 155 }
 156
 157 const Vector3 &TextureCube::get_s_direction(TextureCubeFace face)
 158 {
 159         switch(face)
 160         {
 161         case POSITIVE_X: return directions[5];
 162         case NEGATIVE_X: return directions[4];
 163         case POSITIVE_Y: return directions[0];
 164         case NEGATIVE_Y: return directions[0];
 165         case POSITIVE_Z: return directions[0];
 166         case NEGATIVE_Z: return directions[1];
 167         default: throw invalid_argument("TextureCube::get_s_direction");
 168         }
 169 }
 170
 171 const Vector3 &TextureCube::get_t_direction(TextureCubeFace face)
 172 {
 173         switch(face)
 174         {
 175         case POSITIVE_X: return directions[3];
 176         case NEGATIVE_X: return directions[3];
 177         case POSITIVE_Y: return directions[4];
 178         case NEGATIVE_Y: return directions[5];
 179         case POSITIVE_Z: return directions[3];
 180         case NEGATIVE_Z: return directions[3];
 181         default: throw invalid_argument("TextureCube::get_t_direction");
 182         }
 183 }
 184
 185 Vector3 TextureCube::get_texel_direction(TextureCubeFace face, unsigned u, unsigned v)
 186 {
 187         float s = (u+0.5f)*2.0f/size-1.0f;
 188         float t = (v+0.5f)*2.0f/size-1.0f;
 189         const Vector3 &fv = get_face_direction(face);
 190         const Vector3 &sv = get_s_direction(face);
 191         const Vector3 &tv = get_t_direction(face);
 192         return fv+s*sv+t*tv;
 193 }
 194
 195 UInt64 TextureCube::get_data_size() const
 196 {
 197         return id ? size*size*6*get_pixel_size(ifmt) : 0;
 198 }
 199
 200
 201 TextureCube::Loader::Loader(TextureCube &t):
 202         DataFile::DerivedObjectLoader<TextureCube, Texture::Loader>(t)
 203 {
 204         init();
 205 }
 206
 207 TextureCube::Loader::Loader(TextureCube &t, Collection &c):
 208         DataFile::DerivedObjectLoader<TextureCube, Texture::Loader>(t, c)
 209 {
 210         init();
 211 }
 212
 213 void TextureCube::Loader::init()
 214 {
 215         add("image_data", &Loader::image_data);
 216         add("raw_data", &Loader::raw_data);
 217         add("storage", &Loader::storage);
 218 }
 219
 220 void TextureCube::Loader::image_data(TextureCubeFace face, const string &data)
 221 {
 222         Graphics::Image img;
 223         IO::Memory mem(data.data(), data.size());
 224         img.load_io(mem);
 225
 226         obj.image(face, img, srgb);
 227 }
 228
 229 void TextureCube::Loader::raw_data(TextureCubeFace face, const string &data)
 230 {
 231         obj.image(face, 0, get_base_pixelformat(obj.ifmt), UNSIGNED_BYTE, data.data());
 232 }
 233
 234 void TextureCube::Loader::storage(PixelFormat fmt, unsigned s)
 235 {
 236         if(srgb)
 237                 fmt = get_srgb_pixelformat(fmt);
 238         obj.storage(fmt, s);
 239 }
 240
 241
 242 void operator>>(const LexicalConverter &conv, TextureCubeFace &face)
 243 {
 244         const string &str = conv.get();
 245         if(str=="POSITIVE_X")
 246                 face = POSITIVE_X;
 247         else if(str=="NEGATIVE_X")
 248                 face = NEGATIVE_X;
 249         else if(str=="POSITIVE_Y")
 250                 face = POSITIVE_Y;
 251         else if(str=="NEGATIVE_Y")
 252                 face = NEGATIVE_Y;
 253         else if(str=="POSITIVE_Z")
 254                 face = POSITIVE_Z;
 255         else if(str=="NEGATIVE_Z")
 256                 face = NEGATIVE_Z;
 257         else
 258                 throw lexical_error(format("conversion of '%s' to TextureCubeFace", str));
 259 }
 260
 261 } // namespace GL
 262 } // namespace Msp