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 "texturecube.h"
   7
   8 using namespace std;
   9
  10 namespace Msp {
  11 namespace GL {
  12
  13 Vector3 TextureCube::directions[6] =
  14 {
  15         Vector3(1, 0, 0),
  16         Vector3(-1, 0, 0),
  17         Vector3(0, 1, 0),
  18         Vector3(0, -1, 0),
  19         Vector3(0, 0, 1),
  20         Vector3(0, 0, -1)
  21 };
  22
  23 TextureCube::TextureCube():
  24         Texture(GL_TEXTURE_CUBE_MAP),
  25         size(0),
  26         allocated(0)
  27 {
  28         static Require _req(ARB_texture_cube_map);
  29 }
  30
  31 void TextureCube::storage(PixelFormat fmt, unsigned sz)
  32 {
  33         if(size>0)
  34                 throw invalid_operation("TextureCube::storage");
  35         if(sz==0)
  36                 throw invalid_argument("TextureCube::storage");
  37         require_pixelformat(fmt);
  38
  39         ifmt = fmt;
  40         size = sz;
  41 }
  42
  43 void TextureCube::allocate(unsigned level)
  44 {
  45         if(allocated&(1<<level))
  46                 return;
  47
  48         for(unsigned i=0; i<6; ++i)
  49                 image(enumerate_faces(i), level, get_base_pixelformat(ifmt), UNSIGNED_BYTE, 0);
  50 }
  51
  52 void TextureCube::image(TextureCubeFace face, unsigned level, PixelFormat fmt, DataType type, const void *data)
  53 {
  54         if(size==0)
  55                 throw invalid_operation("TextureCube::image");
  56
  57         unsigned s = get_level_size(level);
  58         if(s==0)
  59                 throw out_of_range("TextureCube::image");
  60
  61         Bind _bind(this, true);
  62         glTexImage2D(face, level, ifmt, s, s, 0, fmt, type, data);
  63
  64         // XXX Allocation should be tracked per-face, but we'll run out of bits
  65         allocated |= 1<<level;
  66         if(gen_mipmap && level==0)
  67         {
  68                 for(; s; s>>=1, ++level) ;
  69                 allocated |= (1<<level)-1;
  70         }
  71 }
  72
  73 void TextureCube::image(TextureCubeFace face, const Graphics::Image &img)
  74 {
  75         unsigned w = img.get_width();
  76         unsigned h = img.get_height();
  77         PixelFormat fmt = pixelformat_from_graphics(img.get_format());
  78         if(size==0)
  79         {
  80                 if(w==h)
  81                         storage(fmt, w);
  82                 else
  83                         throw incompatible_data("TextureCube::image");
  84         }
  85         else if(w!=size || h!=size)
  86                 throw incompatible_data("TextureCube::image");
  87
  88         image(face, 0, fmt, UNSIGNED_BYTE, img.get_data());
  89 }
  90
  91 unsigned TextureCube::get_level_size(unsigned level)
  92 {
  93         return size>>level;
  94 }
  95
  96 TextureCubeFace TextureCube::enumerate_faces(unsigned i)
  97 {
  98         switch(i)
  99         {
 100         case 0: return POSITIVE_X;
 101         case 1: return NEGATIVE_X;
 102         case 2: return POSITIVE_Y;
 103         case 3: return NEGATIVE_Y;
 104         case 4: return POSITIVE_Z;
 105         case 5: return NEGATIVE_Z;
 106         default: throw out_of_range("TextureCube::enumerate_faces");
 107         }
 108 }
 109
 110 const Vector3 &TextureCube::get_face_direction(TextureCubeFace face)
 111 {
 112         switch(face)
 113         {
 114         case POSITIVE_X: return directions[0];
 115         case NEGATIVE_X: return directions[1];
 116         case POSITIVE_Y: return directions[2];
 117         case NEGATIVE_Y: return directions[3];
 118         case POSITIVE_Z: return directions[4];
 119         case NEGATIVE_Z: return directions[5];
 120         default: throw invalid_argument("TextureCube::get_face_direction");
 121         }
 122 }
 123
 124 const Vector3 &TextureCube::get_s_direction(TextureCubeFace face)
 125 {
 126         switch(face)
 127         {
 128         case POSITIVE_X: return directions[5];
 129         case NEGATIVE_X: return directions[4];
 130         case POSITIVE_Y: return directions[0];
 131         case NEGATIVE_Y: return directions[0];
 132         case POSITIVE_Z: return directions[0];
 133         case NEGATIVE_Z: return directions[1];
 134         default: throw invalid_argument("TextureCube::get_s_direction");
 135         }
 136 }
 137
 138 const Vector3 &TextureCube::get_t_direction(TextureCubeFace face)
 139 {
 140         switch(face)
 141         {
 142         case POSITIVE_X: return directions[3];
 143         case NEGATIVE_X: return directions[3];
 144         case POSITIVE_Y: return directions[4];
 145         case NEGATIVE_Y: return directions[5];
 146         case POSITIVE_Z: return directions[3];
 147         case NEGATIVE_Z: return directions[3];
 148         default: throw invalid_argument("TextureCube::get_t_direction");
 149         }
 150 }
 151
 152 Vector3 TextureCube::get_texel_direction(TextureCubeFace face, unsigned u, unsigned v)
 153 {
 154         float s = (u+0.5f)*2.0f/size-1.0f;
 155         float t = (v+0.5f)*2.0f/size-1.0f;
 156         const Vector3 &fv = get_face_direction(face);
 157         const Vector3 &sv = get_s_direction(face);
 158         const Vector3 &tv = get_t_direction(face);
 159         return fv+s*sv+t*tv;
 160 }
 161
 162
 163 TextureCube::Loader::Loader(TextureCube &t):
 164         DataFile::DerivedObjectLoader<TextureCube, Texture::Loader>(t)
 165 {
 166         add("image_data", &Loader::image_data);
 167         add("raw_data", &Loader::raw_data);
 168         add("storage", &Loader::storage);
 169 }
 170
 171 void TextureCube::Loader::image_data(TextureCubeFace face, const string &data)
 172 {
 173         Graphics::Image img;
 174         IO::Memory mem(data.data(), data.size());
 175         img.load_io(mem);
 176
 177         obj.image(face, img);
 178 }
 179
 180 void TextureCube::Loader::raw_data(TextureCubeFace face, const string &data)
 181 {
 182         obj.image(face, 0, obj.ifmt, UNSIGNED_BYTE, data.data());
 183 }
 184
 185 void TextureCube::Loader::storage(PixelFormat fmt, unsigned s)
 186 {
 187         obj.storage(fmt, s);
 188 }
 189
 190
 191 void operator>>(const LexicalConverter &conv, TextureCubeFace &face)
 192 {
 193         const string &str = conv.get();
 194         if(str=="POSITIVE_X")
 195                 face = POSITIVE_X;
 196         else if(str=="NEGATIVE_X")
 197                 face = NEGATIVE_X;
 198         else if(str=="POSITIVE_Y")
 199                 face = POSITIVE_Y;
 200         else if(str=="NEGATIVE_Y")
 201                 face = NEGATIVE_Y;
 202         else if(str=="POSITIVE_Z")
 203                 face = POSITIVE_Z;
 204         else if(str=="NEGATIVE_Z")
 205                 face = NEGATIVE_Z;
 206         else
 207                 throw lexical_error(format("conversion of '%s' to TextureCubeFace", str));
 208 }
 209
 210 } // namespace GL
 211 } // namespace Msp