source/texture3d.cpp

   1 #include <cmath>
   2 #include <msp/gl/extensions/ext_texture3d.h>
   3 #include <msp/graphics/image.h>
   4 #include "bindable.h"
   5 #include "error.h"
   6 #include "pixelstore.h"
   7 #include "texture3d.h"
   8
   9 using namespace std;
  10
  11 namespace Msp {
  12 namespace GL {
  13
  14 Texture3D::Texture3D():
  15         Texture(GL_TEXTURE_3D),
  16         ifmt(RGB),
  17         width(0),
  18         height(0),
  19         depth(0),
  20         allocated(0)
  21 {
  22         static Require _req(EXT_texture3D);
  23 }
  24
  25 void Texture3D::storage(PixelFormat fmt, unsigned wd, unsigned ht, unsigned dp)
  26 {
  27         if(width>0)
  28                 throw invalid_operation("Texture3D::storage");
  29         if(wd==0 || ht==0 || dp==0)
  30                 throw invalid_argument("Texture3D::storage");
  31         require_pixelformat(fmt);
  32
  33         width = wd;
  34         height = ht;
  35         depth = dp;
  36         ifmt = fmt;
  37 }
  38
  39 void Texture3D::allocate(unsigned level)
  40 {
  41         if(allocated&(1<<level))
  42                 return;
  43
  44         image(level, get_base_pixelformat(ifmt), UNSIGNED_BYTE, 0);
  45 }
  46
  47 void Texture3D::image(unsigned level, PixelFormat fmt, DataType type, const void *data)
  48 {
  49         if(width==0 || height==0 || depth==0)
  50                 throw invalid_operation("Texture3D::image");
  51
  52         unsigned w = width;
  53         unsigned h = height;
  54         unsigned d = depth;
  55         get_level_size(level, w, h, d);
  56
  57         BindRestore _bind(this);
  58         glTexImage3D(target, level, ifmt, width, height, depth, 0, fmt, type, data);
  59
  60         allocated |= 1<<level;
  61         if(gen_mipmap && level==0)
  62         {
  63                 for(; (w || h || d); w>>=1, h>>=1, d>>=1, ++level) ;
  64                 allocated |= (1<<level)-1;
  65         }
  66 }
  67
  68 void Texture3D::sub_image(unsigned level, int x, int y, int z, unsigned wd, unsigned ht, unsigned dp, PixelFormat fmt, DataType type, const void *data)
  69 {
  70         if(width==0 || height==0 || depth==0)
  71                 throw invalid_operation("Texture3D::image");
  72
  73         allocate(level);
  74
  75         BindRestore _bind(this);
  76         glTexSubImage3D(target, level, x, y, z, wd, ht, dp, fmt, type, data);
  77 }
  78
  79 void Texture3D::load_image(const string &fn, int dp)
  80 {
  81         Graphics::Image img;
  82         img.load_file(fn);
  83
  84         unsigned w = img.get_width();
  85         unsigned h = img.get_height();
  86         unsigned d = 1;
  87
  88         if(dp==-1)
  89         {
  90                 if(h%w)
  91                         throw incompatible_data("Texture3D::load_image");
  92                 d = h/w;
  93                 h = w;
  94         }
  95         else if(dp==-2)
  96         {
  97                 for(d=h; d*d>h; d>>=2) ;
  98                 for(; d*d<h; ++d) ;
  99                 if(d*d!=h)
 100                         throw incompatible_data("Texture3D::load_image");
 101                 h = d;
 102         }
 103         else if(dp>0)
 104         {
 105                 d = dp;
 106                 if(h%d)
 107                         throw incompatible_data("Texture3D::load_image");
 108                 h /= d;
 109         }
 110         else
 111                 throw invalid_argument("Texture3D::load_image");
 112
 113         PixelFormat fmt = pixelformat_from_graphics(img.get_format());
 114         if(width==0)
 115                 storage(storage_pixelformat_from_graphics(img.get_format()), w, h, d);
 116         else if(w!=width || h!=height || d!=depth)
 117                 throw incompatible_data("Texture3D::load_image");
 118
 119         PixelStore pstore = PixelStore::from_image(img);
 120         BindRestore _bind_ps(pstore);
 121
 122         image(0, fmt, UNSIGNED_BYTE, img.get_data());
 123 }
 124
 125 void Texture3D::get_level_size(unsigned level, unsigned &w, unsigned &h, unsigned &d)
 126 {
 127         w >>= level;
 128         h >>= level;
 129         d >>= level;
 130
 131         if(!w && (h || d))
 132                 w = 1;
 133         if(!h && (w || d))
 134                 h = 1;
 135         if(!d && (w || h))
 136                 d = 1;
 137 }
 138
 139 UInt64 Texture3D::get_data_size() const
 140 {
 141         return id ? width*height*depth*get_pixel_size(ifmt) : 0;
 142 }
 143
 144 } // namespace GL
 145 } // namespace Msp