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         PixelFormat base_fmt = get_base_pixelformat(ifmt);
  45         image(level, base_fmt, get_alloc_type(base_fmt), 0);
  46 }
  47
  48 void Texture3D::image(unsigned level, PixelFormat fmt, DataType type, const void *data)
  49 {
  50         if(width==0 || height==0 || depth==0)
  51                 throw invalid_operation("Texture3D::image");
  52
  53         unsigned w = width;
  54         unsigned h = height;
  55         unsigned d = depth;
  56         get_level_size(level, w, h, d);
  57
  58         BindRestore _bind(this);
  59         glTexImage3D(target, level, ifmt, width, height, depth, 0, fmt, type, data);
  60
  61         allocated |= 1<<level;
  62         if(gen_mipmap && level==0)
  63         {
  64                 auto_generate_mipmap();
  65                 for(; (w || h || d); w>>=1, h>>=1, d>>=1, ++level) ;
  66                 allocated |= (1<<level)-1;
  67         }
  68 }
  69
  70 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)
  71 {
  72         if(width==0 || height==0 || depth==0)
  73                 throw invalid_operation("Texture3D::image");
  74
  75         allocate(level);
  76
  77         BindRestore _bind(this);
  78         glTexSubImage3D(target, level, x, y, z, wd, ht, dp, fmt, type, data);
  79 }
  80
  81 void Texture3D::load_image(const string &fn, int dp)
  82 {
  83         Graphics::Image img;
  84         img.load_file(fn);
  85
  86         unsigned w = img.get_width();
  87         unsigned h = img.get_height();
  88         unsigned d = 1;
  89
  90         if(dp==-1)
  91         {
  92                 if(h%w)
  93                         throw incompatible_data("Texture3D::load_image");
  94                 d = h/w;
  95                 h = w;
  96         }
  97         else if(dp==-2)
  98         {
  99                 for(d=h; d*d>h; d>>=2) ;
 100                 for(; d*d<h; ++d) ;
 101                 if(d*d!=h)
 102                         throw incompatible_data("Texture3D::load_image");
 103                 h = d;
 104         }
 105         else if(dp>0)
 106         {
 107                 d = dp;
 108                 if(h%d)
 109                         throw incompatible_data("Texture3D::load_image");
 110                 h /= d;
 111         }
 112         else
 113                 throw invalid_argument("Texture3D::load_image");
 114
 115         PixelFormat fmt = pixelformat_from_graphics(img.get_format());
 116         if(width==0)
 117                 storage(storage_pixelformat_from_graphics(img.get_format()), w, h, d);
 118         else if(w!=width || h!=height || d!=depth)
 119                 throw incompatible_data("Texture3D::load_image");
 120
 121         PixelStore pstore = PixelStore::from_image(img);
 122         BindRestore _bind_ps(pstore);
 123
 124         image(0, fmt, UNSIGNED_BYTE, img.get_data());
 125 }
 126
 127 void Texture3D::get_level_size(unsigned level, unsigned &w, unsigned &h, unsigned &d)
 128 {
 129         w >>= level;
 130         h >>= level;
 131         d >>= level;
 132
 133         if(!w && (h || d))
 134                 w = 1;
 135         if(!h && (w || d))
 136                 h = 1;
 137         if(!d && (w || h))
 138                 d = 1;
 139 }
 140
 141 UInt64 Texture3D::get_data_size() const
 142 {
 143         return id ? width*height*depth*get_pixel_size(ifmt) : 0;
 144 }
 145
 146 } // namespace GL
 147 } // namespace Msp