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         size(0),
  27         allocated(0)
  28 {
  29         static Require _req(ARB_texture_cube_map);
  30 }
  31
  32 void TextureCube::storage(PixelFormat fmt, unsigned sz)
  33 {
  34         if(size>0)
  35                 throw invalid_operation("TextureCube::storage");
  36         if(sz==0)
  37                 throw invalid_argument("TextureCube::storage");
  38         require_pixelformat(fmt);
  39
  40         ifmt = fmt;
  41         size = sz;
  42 }
  43
  44 void TextureCube::allocate(unsigned level)
  45 {
  46         if(allocated&(1<<level))
  47                 return;
  48
  49         for(unsigned i=0; i<6; ++i)
  50                 image(enumerate_faces(i), level, get_base_pixelformat(ifmt), UNSIGNED_BYTE, 0);
  51 }
  52
  53 void TextureCube::image(TextureCubeFace face, unsigned level, PixelFormat fmt, DataType type, const void *data)
  54 {
  55         if(size==0)
  56                 throw invalid_operation("TextureCube::image");
  57
  58         unsigned s = get_level_size(level);
  59         if(s==0)
  60                 throw out_of_range("TextureCube::image");
  61
  62         BindRestore _bind(this);
  63         glTexImage2D(face, level, ifmt, s, s, 0, fmt, type, data);
  64
  65         // XXX Allocation should be tracked per-face, but we'll run out of bits
  66         allocated |= 1<<level;
  67         if(gen_mipmap && level==0)
  68         {
  69                 for(; s; s>>=1, ++level) ;
  70                 allocated |= (1<<level)-1;
  71         }
  72 }
  73
  74 void TextureCube::image(TextureCubeFace face, const Graphics::Image &img)
  75 {
  76         unsigned w = img.get_width();
  77         unsigned h = img.get_height();
  78         PixelFormat fmt = pixelformat_from_graphics(img.get_format());
  79         if(size==0)
  80         {
  81                 if(w==h)
  82                         storage(storage_pixelformat_from_graphics(img.get_format()), w);
  83                 else
  84                         throw incompatible_data("TextureCube::image");
  85         }
  86         else if(w!=size || h!=size)
  87                 throw incompatible_data("TextureCube::image");
  88
  89         PixelStore pstore = PixelStore::from_image(img);
  90         BindRestore _bind_ps(pstore);
  91
  92         image(face, 0, fmt, UNSIGNED_BYTE, img.get_data());
  93 }
  94
  95 unsigned TextureCube::get_level_size(unsigned level)
  96 {
  97         return size>>level;
  98 }
  99
 100 TextureCubeFace TextureCube::enumerate_faces(unsigned i)
 101 {
 102         switch(i)
 103         {
 104         case 0: return POSITIVE_X;
 105         case 1: return NEGATIVE_X;
 106         case 2: return POSITIVE_Y;
 107         case 3: return NEGATIVE_Y;
 108         case 4: return POSITIVE_Z;
 109         case 5: return NEGATIVE_Z;
 110         default: throw out_of_range("TextureCube::enumerate_faces");
 111         }
 112 }
 113
 114 const Vector3 &TextureCube::get_face_direction(TextureCubeFace face)
 115 {
 116         switch(face)
 117         {
 118         case POSITIVE_X: return directions[0];
 119         case NEGATIVE_X: return directions[1];
 120         case POSITIVE_Y: return directions[2];
 121         case NEGATIVE_Y: return directions[3];
 122         case POSITIVE_Z: return directions[4];
 123         case NEGATIVE_Z: return directions[5];
 124         default: throw invalid_argument("TextureCube::get_face_direction");
 125         }
 126 }
 127
 128 const Vector3 &TextureCube::get_s_direction(TextureCubeFace face)
 129 {
 130         switch(face)
 131         {
 132         case POSITIVE_X: return directions[5];
 133         case NEGATIVE_X: return directions[4];
 134         case POSITIVE_Y: return directions[0];
 135         case NEGATIVE_Y: return directions[0];
 136         case POSITIVE_Z: return directions[0];
 137         case NEGATIVE_Z: return directions[1];
 138         default: throw invalid_argument("TextureCube::get_s_direction");
 139         }
 140 }
 141
 142 const Vector3 &TextureCube::get_t_direction(TextureCubeFace face)
 143 {
 144         switch(face)
 145         {
 146         case POSITIVE_X: return directions[3];
 147         case NEGATIVE_X: return directions[3];
 148         case POSITIVE_Y: return directions[4];
 149         case NEGATIVE_Y: return directions[5];
 150         case POSITIVE_Z: return directions[3];
 151         case NEGATIVE_Z: return directions[3];
 152         default: throw invalid_argument("TextureCube::get_t_direction");
 153         }
 154 }
 155
 156 Vector3 TextureCube::get_texel_direction(TextureCubeFace face, unsigned u, unsigned v)
 157 {
 158         float s = (u+0.5f)*2.0f/size-1.0f;
 159         float t = (v+0.5f)*2.0f/size-1.0f;
 160         const Vector3 &fv = get_face_direction(face);
 161         const Vector3 &sv = get_s_direction(face);
 162         const Vector3 &tv = get_t_direction(face);
 163         return fv+s*sv+t*tv;
 164 }
 165
 166
 167 TextureCube::Loader::Loader(TextureCube &t):
 168         DataFile::DerivedObjectLoader<TextureCube, Texture::Loader>(t)
 169 {
 170         add("image_data", &Loader::image_data);
 171         add("raw_data", &Loader::raw_data);
 172         add("storage", &Loader::storage);
 173 }
 174
 175 void TextureCube::Loader::image_data(TextureCubeFace face, const string &data)
 176 {
 177         Graphics::Image img;
 178         IO::Memory mem(data.data(), data.size());
 179         img.load_io(mem);
 180
 181         obj.image(face, img);
 182 }
 183
 184 void TextureCube::Loader::raw_data(TextureCubeFace face, const string &data)
 185 {
 186         obj.image(face, 0, obj.ifmt, UNSIGNED_BYTE, data.data());
 187 }
 188
 189 void TextureCube::Loader::storage(PixelFormat fmt, unsigned s)
 190 {
 191         obj.storage(fmt, s);
 192 }
 193
 194
 195 void operator>>(const LexicalConverter &conv, TextureCubeFace &face)
 196 {
 197         const string &str = conv.get();
 198         if(str=="POSITIVE_X")
 199                 face = POSITIVE_X;
 200         else if(str=="NEGATIVE_X")
 201                 face = NEGATIVE_X;
 202         else if(str=="POSITIVE_Y")
 203                 face = POSITIVE_Y;
 204         else if(str=="NEGATIVE_Y")
 205                 face = NEGATIVE_Y;
 206         else if(str=="POSITIVE_Z")
 207                 face = POSITIVE_Z;
 208         else if(str=="NEGATIVE_Z")
 209                 face = NEGATIVE_Z;
 210         else
 211                 throw lexical_error(format("conversion of '%s' to TextureCubeFace", str));
 212 }
 213
 214 } // namespace GL
 215 } // namespace Msp