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