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::image(const Graphics::Image &img, bool srgb)
 128 {
 129         unsigned w = img.get_width();
 130         unsigned h = img.get_height();
 131         unsigned d = 1;
 132
 133         if(depth)
 134         {
 135                 if(h%depth)
 136                         throw incompatible_data("Texture3D::load_image");
 137                 h /= depth;
 138                 d = depth;
 139         }
 140         else
 141         {
 142                 if(h%w)
 143                         throw incompatible_data("Texture3D::load_image");
 144                 d = h/w;
 145                 h = w;
 146         }
 147
 148         PixelFormat fmt = pixelformat_from_graphics(img.get_format());
 149         if(width==0)
 150                 storage(storage_pixelformat_from_graphics(img.get_format(), srgb), w, h, d);
 151         else if(w!=width || h!=height || d!=depth)
 152                 throw incompatible_data("Texture3D::load_image");
 153
 154         PixelStore pstore = PixelStore::from_image(img);
 155         BindRestore _bind_ps(pstore);
 156
 157         image(0, fmt, UNSIGNED_BYTE, img.get_data());
 158 }
 159
 160 void Texture3D::get_level_size(unsigned level, unsigned &w, unsigned &h, unsigned &d)
 161 {
 162         w >>= level;
 163         h >>= level;
 164         d >>= level;
 165
 166         if(!w && (h || d))
 167                 w = 1;
 168         if(!h && (w || d))
 169                 h = 1;
 170         if(!d && (w || h))
 171                 d = 1;
 172 }
 173
 174 UInt64 Texture3D::get_data_size() const
 175 {
 176         return id ? width*height*depth*get_pixel_size(ifmt) : 0;
 177 }
 178
 179
 180 Texture3D::Loader::Loader(Texture3D &t):
 181         DataFile::DerivedObjectLoader<Texture3D, Texture::Loader>(t)
 182 {
 183         init();
 184 }
 185
 186 Texture3D::Loader::Loader(Texture3D &t, Collection &c):
 187         DataFile::DerivedObjectLoader<Texture3D, Texture::Loader>(t, c)
 188 {
 189         init();
 190 }
 191
 192 void Texture3D::Loader::init()
 193 {
 194         add("raw_data", &Loader::raw_data);
 195         add("storage", &Loader::storage);
 196 }
 197
 198 void Texture3D::Loader::raw_data(const string &data)
 199 {
 200         obj.image(0, get_base_pixelformat(obj.ifmt), UNSIGNED_BYTE, data.data());
 201 }
 202
 203 void Texture3D::Loader::storage(PixelFormat fmt, unsigned w, unsigned h, unsigned d)
 204 {
 205         if(srgb)
 206                 fmt = get_srgb_pixelformat(fmt);
 207         obj.storage(fmt, w, h, d);
 208 }
 209
 210 } // namespace GL
 211 } // namespace Msp