source/texture1d.cpp

   1 #include <msp/gl/extensions/msp_texture1d.h>
   2 #include "bindable.h"
   3 #include "error.h"
   4 #include "texture1d.h"
   5
   6 using namespace std;
   7
   8 namespace Msp {
   9 namespace GL {
  10
  11 Texture1D::Texture1D():
  12         Texture(GL_TEXTURE_1D),
  13         ifmt(RGB),
  14         width(0),
  15         allocated(0)
  16 {
  17         static Require _req(MSP_texture1D);
  18 }
  19
  20 void Texture1D::storage(PixelFormat fmt, unsigned wd)
  21 {
  22         if(width>0)
  23                 throw invalid_operation("Texture1D::storage");
  24         if(wd==0)
  25                 throw invalid_argument("Texture1D::storage");
  26         require_pixelformat(fmt);
  27
  28         ifmt = fmt;
  29         width = wd;
  30 }
  31
  32 void Texture1D::allocate(unsigned level)
  33 {
  34         if(allocated&(1<<level))
  35                 return;
  36
  37         image(level, get_base_pixelformat(ifmt), UNSIGNED_BYTE, 0);
  38 }
  39
  40 void Texture1D::image(unsigned level, PixelFormat fmt, DataType type, const void *data)
  41 {
  42         if(width==0)
  43                 throw invalid_operation("Texture1D::image");
  44
  45         unsigned w = get_level_size(level);
  46
  47         BindRestore _bind(this);
  48         glTexImage1D(target, level, ifmt, w, 0, fmt, type, data);
  49
  50         allocated |= 1<<level;
  51         if(gen_mipmap && level==0)
  52         {
  53                 auto_generate_mipmap();
  54                 for(; w; w>>=1, ++level) ;
  55                 allocated |= (1<<level)-1;
  56         }
  57 }
  58
  59 unsigned Texture1D::get_level_size(unsigned level)
  60 {
  61         return width>>level;
  62 }
  63
  64 UInt64 Texture1D::get_data_size() const
  65 {
  66         return id ? width*get_pixel_size(ifmt) : 0;
  67 }
  68
  69 } // namespace GL
  70 } // namespace Msp