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(GLenum t):
  15         Texture(t),
  16         ifmt(RGB),
  17         width(0),
  18         height(0),
  19         depth(0),
  20         allocated(0)
  21 { }
  22
  23 Texture3D::Texture3D():
  24         Texture(GL_TEXTURE_3D),
  25         ifmt(RGB),
  26         width(0),
  27         height(0),
  28         depth(0),
  29         allocated(0)
  30 {
  31         static Require _req(EXT_texture3D);
  32 }
  33
  34 void Texture3D::storage(PixelFormat fmt, unsigned wd, unsigned ht, unsigned dp)
  35 {
  36         if(width>0)
  37                 throw invalid_operation("Texture3D::storage");
  38         if(wd==0 || ht==0 || dp==0)
  39                 throw invalid_argument("Texture3D::storage");
  40
  41         if(MSP_sized_internal_formats)
  42                 fmt = get_sized_pixelformat(fmt);
  43         require_pixelformat(fmt);
  44
  45         ifmt = fmt;
  46         width = wd;
  47         height = ht;
  48         depth = dp;
  49 }
  50
  51 void Texture3D::allocate(unsigned level)
  52 {
  53         if(allocated&(1<<level))
  54                 return;
  55
  56         PixelFormat base_fmt = get_base_pixelformat(ifmt);
  57         image(level, base_fmt, get_alloc_type(base_fmt), 0);
  58 }
  59
  60 void Texture3D::image(unsigned level, PixelFormat fmt, DataType type, const void *data)
  61 {
  62         if(width==0 || height==0 || depth==0)
  63                 throw invalid_operation("Texture3D::image");
  64
  65         unsigned w = width;
  66         unsigned h = height;
  67         unsigned d = depth;
  68         get_level_size(level, w, h, d);
  69
  70         BindRestore _bind(this);
  71         glTexImage3D(target, level, ifmt, width, height, depth, 0, fmt, type, data);
  72
  73         allocated |= 1<<level;
  74         if(gen_mipmap && level==0)
  75         {
  76                 auto_generate_mipmap();
  77                 for(; (w || h || d); w>>=1, h>>=1, d>>=1, ++level) ;
  78                 allocated |= (1<<level)-1;
  79         }
  80 }
  81
  82 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)
  83 {
  84         if(width==0 || height==0 || depth==0)
  85                 throw invalid_operation("Texture3D::image");
  86
  87         allocate(level);
  88
  89         BindRestore _bind(this);
  90         glTexSubImage3D(target, level, x, y, z, wd, ht, dp, fmt, type, data);
  91 }
  92
  93 void Texture3D::load_image(const string &fn, int dp)
  94 {
  95         Graphics::Image img;
  96         img.load_file(fn);
  97
  98         unsigned w = img.get_width();
  99         unsigned h = img.get_height();
 100         unsigned d = 1;
 101
 102         if(dp==-1)
 103         {
 104                 if(h%w)
 105                         throw incompatible_data("Texture3D::load_image");
 106                 d = h/w;
 107                 h = w;
 108         }
 109         else if(dp==-2)
 110         {
 111                 for(d=h; d*d>h; d>>=2) ;
 112                 for(; d*d<h; ++d) ;
 113                 if(d*d!=h)
 114                         throw incompatible_data("Texture3D::load_image");
 115                 h = d;
 116         }
 117         else if(dp>0)
 118         {
 119                 d = dp;
 120                 if(h%d)
 121                         throw incompatible_data("Texture3D::load_image");
 122                 h /= d;
 123         }
 124         else
 125                 throw invalid_argument("Texture3D::load_image");
 126
 127         PixelFormat fmt = pixelformat_from_graphics(img.get_format());
 128         if(width==0)
 129                 storage(storage_pixelformat_from_graphics(img.get_format()), w, h, d);
 130         else if(w!=width || h!=height || d!=depth)
 131                 throw incompatible_data("Texture3D::load_image");
 132
 133         PixelStore pstore = PixelStore::from_image(img);
 134         BindRestore _bind_ps(pstore);
 135
 136         image(0, fmt, UNSIGNED_BYTE, img.get_data());
 137 }
 138
 139 void Texture3D::image(const Graphics::Image &img, bool srgb)
 140 {
 141         unsigned w = img.get_width();
 142         unsigned h = img.get_height();
 143         unsigned d = 1;
 144
 145         if(depth)
 146         {
 147                 if(h%depth)
 148                         throw incompatible_data("Texture3D::load_image");
 149                 h /= depth;
 150                 d = depth;
 151         }
 152         else
 153         {
 154                 if(h%w)
 155                         throw incompatible_data("Texture3D::load_image");
 156                 d = h/w;
 157                 h = w;
 158         }
 159
 160         PixelFormat fmt = pixelformat_from_graphics(img.get_format());
 161         if(width==0)
 162                 storage(storage_pixelformat_from_graphics(img.get_format(), srgb), w, h, d);
 163         else if(w!=width || h!=height || d!=depth)
 164                 throw incompatible_data("Texture3D::load_image");
 165
 166         PixelStore pstore = PixelStore::from_image(img);
 167         BindRestore _bind_ps(pstore);
 168
 169         image(0, fmt, UNSIGNED_BYTE, img.get_data());
 170 }
 171
 172 void Texture3D::get_level_size(unsigned level, unsigned &w, unsigned &h, unsigned &d)
 173 {
 174         w >>= level;
 175         h >>= level;
 176         if(target!=GL_TEXTURE_2D_ARRAY)
 177                 d >>= level;
 178
 179         if(!w && (h || d))
 180                 w = 1;
 181         if(!h && (w || d))
 182                 h = 1;
 183         if(!d && (w || h))
 184                 d = 1;
 185 }
 186
 187 UInt64 Texture3D::get_data_size() const
 188 {
 189         return id ? width*height*depth*get_pixel_size(ifmt) : 0;
 190 }
 191
 192
 193 Texture3D::Loader::Loader(Texture3D &t):
 194         DataFile::DerivedObjectLoader<Texture3D, Texture::Loader>(t)
 195 {
 196         init();
 197 }
 198
 199 Texture3D::Loader::Loader(Texture3D &t, Collection &c):
 200         DataFile::DerivedObjectLoader<Texture3D, Texture::Loader>(t, c)
 201 {
 202         init();
 203 }
 204
 205 void Texture3D::Loader::init()
 206 {
 207         add("raw_data", &Loader::raw_data);
 208         add("storage", &Loader::storage);
 209 }
 210
 211 void Texture3D::Loader::raw_data(const string &data)
 212 {
 213         obj.image(0, get_base_pixelformat(obj.ifmt), UNSIGNED_BYTE, data.data());
 214 }
 215
 216 void Texture3D::Loader::storage(PixelFormat fmt, unsigned w, unsigned h, unsigned d)
 217 {
 218         if(srgb)
 219                 fmt = get_srgb_pixelformat(fmt);
 220         obj.storage(fmt, w, h, d);
 221 }
 222
 223 } // namespace GL
 224 } // namespace Msp