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                 PixelFormat f = storage_pixelformat_from_graphics(img.get_format());
  90                 if(srgb)
  91                         f = get_srgb_pixelformat(f);
  92                 storage(f, w);
  93         }
  94         else if(w!=size || h!=size)
  95                 throw incompatible_data("TextureCube::image");
  96
  97         PixelStore pstore = PixelStore::from_image(img);
  98         BindRestore _bind_ps(pstore);
  99
 100         image(face, 0, fmt, UNSIGNED_BYTE, img.get_data());
 101 }
 102
 103 unsigned TextureCube::get_level_size(unsigned level)
 104 {
 105         return size>>level;
 106 }
 107
 108 TextureCubeFace TextureCube::enumerate_faces(unsigned i)
 109 {
 110         switch(i)
 111         {
 112         case 0: return POSITIVE_X;
 113         case 1: return NEGATIVE_X;
 114         case 2: return POSITIVE_Y;
 115         case 3: return NEGATIVE_Y;
 116         case 4: return POSITIVE_Z;
 117         case 5: return NEGATIVE_Z;
 118         default: throw out_of_range("TextureCube::enumerate_faces");
 119         }
 120 }
 121
 122 const Vector3 &TextureCube::get_face_direction(TextureCubeFace face)
 123 {
 124         switch(face)
 125         {
 126         case POSITIVE_X: return directions[0];
 127         case NEGATIVE_X: return directions[1];
 128         case POSITIVE_Y: return directions[2];
 129         case NEGATIVE_Y: return directions[3];
 130         case POSITIVE_Z: return directions[4];
 131         case NEGATIVE_Z: return directions[5];
 132         default: throw invalid_argument("TextureCube::get_face_direction");
 133         }
 134 }
 135
 136 const Vector3 &TextureCube::get_s_direction(TextureCubeFace face)
 137 {
 138         switch(face)
 139         {
 140         case POSITIVE_X: return directions[5];
 141         case NEGATIVE_X: return directions[4];
 142         case POSITIVE_Y: return directions[0];
 143         case NEGATIVE_Y: return directions[0];
 144         case POSITIVE_Z: return directions[0];
 145         case NEGATIVE_Z: return directions[1];
 146         default: throw invalid_argument("TextureCube::get_s_direction");
 147         }
 148 }
 149
 150 const Vector3 &TextureCube::get_t_direction(TextureCubeFace face)
 151 {
 152         switch(face)
 153         {
 154         case POSITIVE_X: return directions[3];
 155         case NEGATIVE_X: return directions[3];
 156         case POSITIVE_Y: return directions[4];
 157         case NEGATIVE_Y: return directions[5];
 158         case POSITIVE_Z: return directions[3];
 159         case NEGATIVE_Z: return directions[3];
 160         default: throw invalid_argument("TextureCube::get_t_direction");
 161         }
 162 }
 163
 164 Vector3 TextureCube::get_texel_direction(TextureCubeFace face, unsigned u, unsigned v)
 165 {
 166         float s = (u+0.5f)*2.0f/size-1.0f;
 167         float t = (v+0.5f)*2.0f/size-1.0f;
 168         const Vector3 &fv = get_face_direction(face);
 169         const Vector3 &sv = get_s_direction(face);
 170         const Vector3 &tv = get_t_direction(face);
 171         return fv+s*sv+t*tv;
 172 }
 173
 174 UInt64 TextureCube::get_data_size() const
 175 {
 176         return id ? size*size*6*get_pixel_size(ifmt) : 0;
 177 }
 178
 179
 180 TextureCube::Loader::Loader(TextureCube &t):
 181         DataFile::DerivedObjectLoader<TextureCube, Texture::Loader>(t)
 182 {
 183         init();
 184 }
 185
 186 TextureCube::Loader::Loader(TextureCube &t, Collection &c):
 187         DataFile::DerivedObjectLoader<TextureCube, Texture::Loader>(t, c)
 188 {
 189         init();
 190 }
 191
 192 void TextureCube::Loader::init()
 193 {
 194         add("image_data", &Loader::image_data);
 195         add("raw_data", &Loader::raw_data);
 196         add("storage", &Loader::storage);
 197 }
 198
 199 void TextureCube::Loader::image_data(TextureCubeFace face, const string &data)
 200 {
 201         Graphics::Image img;
 202         IO::Memory mem(data.data(), data.size());
 203         img.load_io(mem);
 204
 205         obj.image(face, img, srgb);
 206 }
 207
 208 void TextureCube::Loader::raw_data(TextureCubeFace face, const string &data)
 209 {
 210         obj.image(face, 0, get_base_pixelformat(obj.ifmt), UNSIGNED_BYTE, data.data());
 211 }
 212
 213 void TextureCube::Loader::storage(PixelFormat fmt, unsigned s)
 214 {
 215         if(srgb)
 216                 fmt = get_srgb_pixelformat(fmt);
 217         obj.storage(fmt, s);
 218 }
 219
 220
 221 void operator>>(const LexicalConverter &conv, TextureCubeFace &face)
 222 {
 223         const string &str = conv.get();
 224         if(str=="POSITIVE_X")
 225                 face = POSITIVE_X;
 226         else if(str=="NEGATIVE_X")
 227                 face = NEGATIVE_X;
 228         else if(str=="POSITIVE_Y")
 229                 face = POSITIVE_Y;
 230         else if(str=="NEGATIVE_Y")
 231                 face = NEGATIVE_Y;
 232         else if(str=="POSITIVE_Z")
 233                 face = POSITIVE_Z;
 234         else if(str=="NEGATIVE_Z")
 235                 face = NEGATIVE_Z;
 236         else
 237                 throw lexical_error(format("conversion of '%s' to TextureCubeFace", str));
 238 }
 239
 240 } // namespace GL
 241 } // namespace Msp