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         PixelFormat base_fmt = get_base_pixelformat(ifmt);
  38         image(level, base_fmt, get_alloc_type(base_fmt), 0);
  39 }
  40
  41 void Texture1D::image(unsigned level, PixelFormat fmt, DataType type, const void *data)
  42 {
  43         if(width==0)
  44                 throw invalid_operation("Texture1D::image");
  45
  46         unsigned w = get_level_size(level);
  47
  48         BindRestore _bind(this);
  49         glTexImage1D(target, level, ifmt, w, 0, fmt, type, data);
  50
  51         allocated |= 1<<level;
  52         if(gen_mipmap && level==0)
  53         {
  54                 auto_generate_mipmap();
  55                 for(; w; w>>=1, ++level) ;
  56                 allocated |= (1<<level)-1;
  57         }
  58 }
  59
  60 unsigned Texture1D::get_level_size(unsigned level)
  61 {
  62         return width>>level;
  63 }
  64
  65 UInt64 Texture1D::get_data_size() const
  66 {
  67         return id ? width*get_pixel_size(ifmt) : 0;
  68 }
  69
  70 } // namespace GL
  71 } // namespace Msp