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         ifmt(RGB),
  13         width(0),
  14         allocated(0)
  15 { }
  16
  17 void Texture1D::storage(PixelFormat fmt, unsigned wd)
  18 {
  19         if(width>0)
  20                 throw invalid_operation("Texture1D::storage");
  21         if(wd==0)
  22                 throw invalid_argument("Texture1D::storage");
  23         require_pixelformat(fmt);
  24
  25         ifmt = fmt;
  26         width = wd;
  27 }
  28
  29 void Texture1D::allocate(unsigned level)
  30 {
  31         if(allocated&(1<<level))
  32                 return;
  33
  34         image(level, get_base_pixelformat(ifmt), UNSIGNED_BYTE, 0);
  35 }
  36
  37 void Texture1D::image(unsigned level, PixelFormat fmt, DataType type, const void *data)
  38 {
  39         if(width==0)
  40                 throw invalid_operation("Texture1D::image");
  41
  42         unsigned w = get_level_size(level);
  43
  44         BindRestore _bind(this);
  45         glTexImage1D(target, level, ifmt, w, 0, fmt, type, data);
  46
  47         allocated |= 1<<level;
  48         if(gen_mipmap && level==0)
  49         {
  50                 for(; w; w>>=1, ++level) ;
  51                 allocated |= (1<<level)-1;
  52         }
  53 }
  54
  55 unsigned Texture1D::get_level_size(unsigned level)
  56 {
  57         return width>>level;
  58 }
  59
  60 UInt64 Texture1D::get_data_size() const
  61 {
  62         return id ? width*get_pixel_size(ifmt) : 0;
  63 }
  64
  65 } // namespace GL
  66 } // namespace Msp