source/texture1d.cpp

   1 #include "bindable.h"
   2 #include "error.h"
   3 #include "texture1d.h"
   4
   5 using namespace std;
   6
   7 namespace Msp {
   8 namespace GL {
   9
  10 Texture1D::Texture1D():
  11         Texture(GL_TEXTURE_1D),
  12         width(0),
  13         allocated(0)
  14 { }
  15
  16 void Texture1D::storage(PixelFormat fmt, unsigned wd)
  17 {
  18         if(width>0)
  19                 throw invalid_operation("Texture1D::storage");
  20         if(wd==0)
  21                 throw invalid_argument("Texture1D::storage");
  22         require_pixelformat(fmt);
  23
  24         ifmt = fmt;
  25         width = wd;
  26 }
  27
  28 void Texture1D::allocate(unsigned level)
  29 {
  30         if(allocated&(1<<level))
  31                 return;
  32
  33         image(level, get_base_pixelformat(ifmt), UNSIGNED_BYTE, 0);
  34 }
  35
  36 void Texture1D::image(unsigned level, PixelFormat fmt, DataType type, const void *data)
  37 {
  38         if(width==0)
  39                 throw invalid_operation("Texture1D::image");
  40
  41         unsigned w = get_level_size(level);
  42
  43         BindRestore _bind(this);
  44         glTexImage1D(target, level, ifmt, w, 0, fmt, type, data);
  45
  46         allocated |= 1<<level;
  47         if(gen_mipmap && level==0)
  48         {
  49                 for(; w; w>>=1, ++level) ;
  50                 allocated |= (1<<level)-1;
  51         }
  52 }
  53
  54 unsigned Texture1D::get_level_size(unsigned level)
  55 {
  56         return width>>level;
  57 }
  58
  59 } // namespace GL
  60 } // namespace Msp