source/texture3d.cpp

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