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