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         for(unsigned i=0; i<6; ++i)
  51                 image(enumerate_faces(i), level, get_base_pixelformat(ifmt), UNSIGNED_BYTE, 0);
  52 }
  53
  54 void TextureCube::image(TextureCubeFace face, unsigned level, PixelFormat fmt, DataType type, const void *data)
  55 {
  56         if(size==0)
  57                 throw invalid_operation("TextureCube::image");
  58
  59         unsigned s = get_level_size(level);
  60         if(s==0)
  61                 throw out_of_range("TextureCube::image");
  62
  63         BindRestore _bind(this);
  64         glTexImage2D(face, level, ifmt, s, s, 0, fmt, type, data);
  65
  66         // XXX Allocation should be tracked per-face, but we'll run out of bits
  67         allocated |= 1<<level;
  68         if(gen_mipmap && level==0)
  69         {
  70                 for(; s; s>>=1, ++level) ;
  71                 allocated |= (1<<level)-1;
  72         }
  73 }
  74
  75 void TextureCube::image(TextureCubeFace face, const Graphics::Image &img, bool srgb)
  76 {
  77         unsigned w = img.get_width();
  78         unsigned h = img.get_height();
  79         PixelFormat fmt = pixelformat_from_graphics(img.get_format());
  80         if(size==0)
  81         {
  82                 if(w!=h)
  83                         throw incompatible_data("TextureCube::image");
  84
  85                 PixelFormat f = storage_pixelformat_from_graphics(img.get_format());
  86                 if(srgb)
  87                         f = get_srgb_pixelformat(f);
  88                 storage(f, w);
  89         }
  90         else if(w!=size || h!=size)
  91                 throw incompatible_data("TextureCube::image");
  92
  93         PixelStore pstore = PixelStore::from_image(img);
  94         BindRestore _bind_ps(pstore);
  95
  96         image(face, 0, fmt, UNSIGNED_BYTE, img.get_data());
  97 }
  98
  99 unsigned TextureCube::get_level_size(unsigned level)
 100 {
 101         return size>>level;
 102 }
 103
 104 TextureCubeFace TextureCube::enumerate_faces(unsigned i)
 105 {
 106         switch(i)
 107         {
 108         case 0: return POSITIVE_X;
 109         case 1: return NEGATIVE_X;
 110         case 2: return POSITIVE_Y;
 111         case 3: return NEGATIVE_Y;
 112         case 4: return POSITIVE_Z;
 113         case 5: return NEGATIVE_Z;
 114         default: throw out_of_range("TextureCube::enumerate_faces");
 115         }
 116 }
 117
 118 const Vector3 &TextureCube::get_face_direction(TextureCubeFace face)
 119 {
 120         switch(face)
 121         {
 122         case POSITIVE_X: return directions[0];
 123         case NEGATIVE_X: return directions[1];
 124         case POSITIVE_Y: return directions[2];
 125         case NEGATIVE_Y: return directions[3];
 126         case POSITIVE_Z: return directions[4];
 127         case NEGATIVE_Z: return directions[5];
 128         default: throw invalid_argument("TextureCube::get_face_direction");
 129         }
 130 }
 131
 132 const Vector3 &TextureCube::get_s_direction(TextureCubeFace face)
 133 {
 134         switch(face)
 135         {
 136         case POSITIVE_X: return directions[5];
 137         case NEGATIVE_X: return directions[4];
 138         case POSITIVE_Y: return directions[0];
 139         case NEGATIVE_Y: return directions[0];
 140         case POSITIVE_Z: return directions[0];
 141         case NEGATIVE_Z: return directions[1];
 142         default: throw invalid_argument("TextureCube::get_s_direction");
 143         }
 144 }
 145
 146 const Vector3 &TextureCube::get_t_direction(TextureCubeFace face)
 147 {
 148         switch(face)
 149         {
 150         case POSITIVE_X: return directions[3];
 151         case NEGATIVE_X: return directions[3];
 152         case POSITIVE_Y: return directions[4];
 153         case NEGATIVE_Y: return directions[5];
 154         case POSITIVE_Z: return directions[3];
 155         case NEGATIVE_Z: return directions[3];
 156         default: throw invalid_argument("TextureCube::get_t_direction");
 157         }
 158 }
 159
 160 Vector3 TextureCube::get_texel_direction(TextureCubeFace face, unsigned u, unsigned v)
 161 {
 162         float s = (u+0.5f)*2.0f/size-1.0f;
 163         float t = (v+0.5f)*2.0f/size-1.0f;
 164         const Vector3 &fv = get_face_direction(face);
 165         const Vector3 &sv = get_s_direction(face);
 166         const Vector3 &tv = get_t_direction(face);
 167         return fv+s*sv+t*tv;
 168 }
 169
 170 UInt64 TextureCube::get_data_size() const
 171 {
 172         return id ? size*size*6*get_pixel_size(ifmt) : 0;
 173 }
 174
 175
 176 TextureCube::Loader::Loader(TextureCube &t):
 177         DataFile::DerivedObjectLoader<TextureCube, Texture::Loader>(t)
 178 {
 179         init();
 180 }
 181
 182 TextureCube::Loader::Loader(TextureCube &t, Collection &c):
 183         DataFile::DerivedObjectLoader<TextureCube, Texture::Loader>(t, c)
 184 {
 185         init();
 186 }
 187
 188 void TextureCube::Loader::init()
 189 {
 190         add("image_data", &Loader::image_data);
 191         add("raw_data", &Loader::raw_data);
 192         add("storage", &Loader::storage);
 193 }
 194
 195 void TextureCube::Loader::image_data(TextureCubeFace face, const string &data)
 196 {
 197         Graphics::Image img;
 198         IO::Memory mem(data.data(), data.size());
 199         img.load_io(mem);
 200
 201         obj.image(face, img, srgb);
 202 }
 203
 204 void TextureCube::Loader::raw_data(TextureCubeFace face, const string &data)
 205 {
 206         obj.image(face, 0, get_base_pixelformat(obj.ifmt), UNSIGNED_BYTE, data.data());
 207 }
 208
 209 void TextureCube::Loader::storage(PixelFormat fmt, unsigned s)
 210 {
 211         if(srgb)
 212                 fmt = get_srgb_pixelformat(fmt);
 213         obj.storage(fmt, s);
 214 }
 215
 216
 217 void operator>>(const LexicalConverter &conv, TextureCubeFace &face)
 218 {
 219         const string &str = conv.get();
 220         if(str=="POSITIVE_X")
 221                 face = POSITIVE_X;
 222         else if(str=="NEGATIVE_X")
 223                 face = NEGATIVE_X;
 224         else if(str=="POSITIVE_Y")
 225                 face = POSITIVE_Y;
 226         else if(str=="NEGATIVE_Y")
 227                 face = NEGATIVE_Y;
 228         else if(str=="POSITIVE_Z")
 229                 face = POSITIVE_Z;
 230         else if(str=="NEGATIVE_Z")
 231                 face = NEGATIVE_Z;
 232         else
 233                 throw lexical_error(format("conversion of '%s' to TextureCubeFace", str));
 234 }
 235
 236 } // namespace GL
 237 } // namespace Msp