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 unsigned TextureCube::get_level_size(unsigned level)
 101 {
 102         return size>>level;
 103 }
 104
 105 TextureCubeFace TextureCube::enumerate_faces(unsigned i)
 106 {
 107         switch(i)
 108         {
 109         case 0: return POSITIVE_X;
 110         case 1: return NEGATIVE_X;
 111         case 2: return POSITIVE_Y;
 112         case 3: return NEGATIVE_Y;
 113         case 4: return POSITIVE_Z;
 114         case 5: return NEGATIVE_Z;
 115         default: throw out_of_range("TextureCube::enumerate_faces");
 116         }
 117 }
 118
 119 const Vector3 &TextureCube::get_face_direction(TextureCubeFace face)
 120 {
 121         switch(face)
 122         {
 123         case POSITIVE_X: return directions[0];
 124         case NEGATIVE_X: return directions[1];
 125         case POSITIVE_Y: return directions[2];
 126         case NEGATIVE_Y: return directions[3];
 127         case POSITIVE_Z: return directions[4];
 128         case NEGATIVE_Z: return directions[5];
 129         default: throw invalid_argument("TextureCube::get_face_direction");
 130         }
 131 }
 132
 133 const Vector3 &TextureCube::get_s_direction(TextureCubeFace face)
 134 {
 135         switch(face)
 136         {
 137         case POSITIVE_X: return directions[5];
 138         case NEGATIVE_X: return directions[4];
 139         case POSITIVE_Y: return directions[0];
 140         case NEGATIVE_Y: return directions[0];
 141         case POSITIVE_Z: return directions[0];
 142         case NEGATIVE_Z: return directions[1];
 143         default: throw invalid_argument("TextureCube::get_s_direction");
 144         }
 145 }
 146
 147 const Vector3 &TextureCube::get_t_direction(TextureCubeFace face)
 148 {
 149         switch(face)
 150         {
 151         case POSITIVE_X: return directions[3];
 152         case NEGATIVE_X: return directions[3];
 153         case POSITIVE_Y: return directions[4];
 154         case NEGATIVE_Y: return directions[5];
 155         case POSITIVE_Z: return directions[3];
 156         case NEGATIVE_Z: return directions[3];
 157         default: throw invalid_argument("TextureCube::get_t_direction");
 158         }
 159 }
 160
 161 Vector3 TextureCube::get_texel_direction(TextureCubeFace face, unsigned u, unsigned v)
 162 {
 163         float s = (u+0.5f)*2.0f/size-1.0f;
 164         float t = (v+0.5f)*2.0f/size-1.0f;
 165         const Vector3 &fv = get_face_direction(face);
 166         const Vector3 &sv = get_s_direction(face);
 167         const Vector3 &tv = get_t_direction(face);
 168         return fv+s*sv+t*tv;
 169 }
 170
 171 UInt64 TextureCube::get_data_size() const
 172 {
 173         return id ? size*size*6*get_pixel_size(ifmt) : 0;
 174 }
 175
 176
 177 TextureCube::Loader::Loader(TextureCube &t):
 178         DataFile::DerivedObjectLoader<TextureCube, Texture::Loader>(t)
 179 {
 180         init();
 181 }
 182
 183 TextureCube::Loader::Loader(TextureCube &t, Collection &c):
 184         DataFile::DerivedObjectLoader<TextureCube, Texture::Loader>(t, c)
 185 {
 186         init();
 187 }
 188
 189 void TextureCube::Loader::init()
 190 {
 191         add("image_data", &Loader::image_data);
 192         add("raw_data", &Loader::raw_data);
 193         add("storage", &Loader::storage);
 194 }
 195
 196 void TextureCube::Loader::image_data(TextureCubeFace face, const string &data)
 197 {
 198         Graphics::Image img;
 199         IO::Memory mem(data.data(), data.size());
 200         img.load_io(mem);
 201
 202         obj.image(face, img, srgb);
 203 }
 204
 205 void TextureCube::Loader::raw_data(TextureCubeFace face, const string &data)
 206 {
 207         obj.image(face, 0, get_base_pixelformat(obj.ifmt), UNSIGNED_BYTE, data.data());
 208 }
 209
 210 void TextureCube::Loader::storage(PixelFormat fmt, unsigned s)
 211 {
 212         if(srgb)
 213                 fmt = get_srgb_pixelformat(fmt);
 214         obj.storage(fmt, s);
 215 }
 216
 217
 218 void operator>>(const LexicalConverter &conv, TextureCubeFace &face)
 219 {
 220         const string &str = conv.get();
 221         if(str=="POSITIVE_X")
 222                 face = POSITIVE_X;
 223         else if(str=="NEGATIVE_X")
 224                 face = NEGATIVE_X;
 225         else if(str=="POSITIVE_Y")
 226                 face = POSITIVE_Y;
 227         else if(str=="NEGATIVE_Y")
 228                 face = NEGATIVE_Y;
 229         else if(str=="POSITIVE_Z")
 230                 face = POSITIVE_Z;
 231         else if(str=="NEGATIVE_Z")
 232                 face = NEGATIVE_Z;
 233         else
 234                 throw lexical_error(format("conversion of '%s' to TextureCubeFace", str));
 235 }
 236
 237 } // namespace GL
 238 } // namespace Msp