source/texturecube.cpp

   1 #include "bindable.h"
   2 #include "error.h"
   3 #include "extension.h"
   4 #include "texturecube.h"
   5
   6 using namespace std;
   7
   8 namespace {
   9
  10 // An array to facilitate looping through the cube faces
  11 Msp::GL::TextureCubeFace faces[6] =
  12 {
  13         Msp::GL::POSITIVE_X,
  14         Msp::GL::NEGATIVE_X,
  15         Msp::GL::POSITIVE_Y,
  16         Msp::GL::NEGATIVE_Y,
  17         Msp::GL::POSITIVE_Z,
  18         Msp::GL::NEGATIVE_Z
  19 };
  20
  21 }
  22
  23
  24 namespace Msp {
  25 namespace GL {
  26
  27 TextureCube::TextureCube():
  28         Texture(GL_TEXTURE_CUBE_MAP),
  29         size(0),
  30         allocated(0)
  31 {
  32         static RequireVersion _ver(1, 3);
  33 }
  34
  35 void TextureCube::storage(PixelFormat fmt, unsigned sz)
  36 {
  37         if(size>0)
  38                 throw invalid_operation("TextureCube::storage");
  39         if(sz==0)
  40                 throw invalid_argument("TextureCube::storage");
  41
  42         ifmt = fmt;
  43         size = sz;
  44 }
  45
  46 void TextureCube::allocate(unsigned level)
  47 {
  48         if(allocated&(1<<level))
  49                 return;
  50
  51         for(unsigned i=0; i<6; ++i)
  52                 image(faces[i], level, get_base_pixelformat(ifmt), UNSIGNED_BYTE, 0);
  53 }
  54
  55 void TextureCube::image(TextureCubeFace face, unsigned level, PixelFormat fmt, DataType type, const void *data)
  56 {
  57         if(size==0)
  58                 throw invalid_operation("TextureCube::image");
  59
  60         unsigned s = get_level_size(level);
  61         if(s==0)
  62                 throw invalid_argument("TextureCube::image");
  63
  64         Bind _bind(this, true);
  65         glTexImage2D(face, level, ifmt, s, s, 0, fmt, type, data);
  66
  67         // XXX Allocation should be tracked per-face, but we'll run out of bits
  68         allocated |= 1<<level;
  69         if(gen_mipmap && level==0)
  70         {
  71                 for(; s; s>>=1, ++level) ;
  72                 allocated |= (1<<level)-1;
  73         }
  74 }
  75
  76 unsigned TextureCube::get_level_size(unsigned level)
  77 {
  78         return size>>level;
  79 }
  80
  81 } // namespace GL
  82 } // namespace Msp