source/texture3d.cpp

   1 #include <cmath>
   2 #include <msp/core/raii.h>
   3 #include <msp/gl/extensions/arb_direct_state_access.h>
   4 #include <msp/gl/extensions/arb_texture_storage.h>
   5 #include <msp/gl/extensions/ext_texture3d.h>
   6 #include <msp/graphics/image.h>
   7 #include "bindable.h"
   8 #include "error.h"
   9 #include "pixelstore.h"
  10 #include "texture3d.h"
  11
  12 using namespace std;
  13
  14 namespace Msp {
  15 namespace GL {
  16
  17 Texture3D::Texture3D(GLenum t):
  18         Texture(t),
  19         width(0),
  20         height(0),
  21         depth(0),
  22         allocated(0)
  23 { }
  24
  25 Texture3D::Texture3D():
  26         Texture(GL_TEXTURE_3D),
  27         width(0),
  28         height(0),
  29         depth(0),
  30         allocated(0)
  31 {
  32         static Require _req(EXT_texture3D);
  33 }
  34
  35 void Texture3D::storage(PixelFormat fmt, unsigned wd, unsigned ht, unsigned dp)
  36 {
  37         if(width>0)
  38                 throw invalid_operation("Texture3D::storage");
  39         if(wd==0 || ht==0 || dp==0)
  40                 throw invalid_argument("Texture3D::storage");
  41
  42         set_internal_format(fmt);
  43         width = wd;
  44         height = ht;
  45         depth = dp;
  46 }
  47
  48 void Texture3D::allocate(unsigned level)
  49 {
  50         if(allocated&(1<<level))
  51                 return;
  52
  53         if(ARB_texture_storage)
  54         {
  55                 unsigned n_levels = (is_mipmapped(min_filter) ? get_n_levels() : 1);
  56                 if(ARB_direct_state_access)
  57                         glTextureStorage3D(id, n_levels, ifmt, width, height, depth);
  58                 else
  59                 {
  60                         BindRestore _bind(this);
  61                         glTexStorage3D(target, n_levels, ifmt, width, height, depth);
  62                 }
  63                 allocated |= (1<<n_levels)-1;
  64         }
  65         else
  66         {
  67                 PixelFormat base_fmt = get_base_pixelformat(ifmt);
  68                 image(level, base_fmt, get_alloc_type(base_fmt), 0);
  69         }
  70 }
  71
  72 void Texture3D::image(unsigned level, PixelFormat fmt, DataType type, const void *data)
  73 {
  74         if(width==0 || height==0 || depth==0)
  75                 throw invalid_operation("Texture3D::image");
  76
  77         unsigned w = width;
  78         unsigned h = height;
  79         unsigned d = depth;
  80         get_level_size(level, w, h, d);
  81
  82         if(ARB_texture_storage)
  83                 return sub_image(level, 0, 0, 0, w, h, d, fmt, type, data);
  84
  85         BindRestore _bind(this);
  86         glTexImage3D(target, level, ifmt, width, height, depth, 0, fmt, type, data);
  87
  88         allocated |= 1<<level;
  89         if(gen_mipmap && level==0)
  90         {
  91                 auto_generate_mipmap();
  92                 allocated |= (1<<get_n_levels())-1;
  93         }
  94 }
  95
  96 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)
  97 {
  98         if(width==0 || height==0 || depth==0)
  99                 throw invalid_operation("Texture3D::image");
 100
 101         Conditional<BindRestore> _bind(!ARB_direct_state_access, this);
 102         allocate(level);
 103
 104         if(ARB_direct_state_access)
 105                 glTextureSubImage3D(id, level, x, y, z, wd, ht, dp, fmt, type, data);
 106         else
 107                 glTexSubImage3D(target, level, x, y, z, wd, ht, dp, fmt, type, data);
 108
 109         if(gen_mipmap && level==0)
 110                 auto_generate_mipmap();
 111 }
 112
 113 void Texture3D::load_image(const string &fn, int dp)
 114 {
 115         Graphics::Image img;
 116         img.load_file(fn);
 117
 118         unsigned w = img.get_width();
 119         unsigned h = img.get_height();
 120         unsigned d = 1;
 121
 122         if(dp==-1)
 123         {
 124                 if(h%w)
 125                         throw incompatible_data("Texture3D::load_image");
 126                 d = h/w;
 127                 h = w;
 128         }
 129         else if(dp==-2)
 130         {
 131                 for(d=h; d*d>h; d>>=2) ;
 132                 for(; d*d<h; ++d) ;
 133                 if(d*d!=h)
 134                         throw incompatible_data("Texture3D::load_image");
 135                 h = d;
 136         }
 137         else if(dp>0)
 138         {
 139                 d = dp;
 140                 if(h%d)
 141                         throw incompatible_data("Texture3D::load_image");
 142                 h /= d;
 143         }
 144         else
 145                 throw invalid_argument("Texture3D::load_image");
 146
 147         PixelFormat fmt = pixelformat_from_graphics(img.get_format());
 148         if(width==0)
 149                 storage(storage_pixelformat_from_graphics(img.get_format()), w, h, d);
 150         else if(w!=width || h!=height || d!=depth)
 151                 throw incompatible_data("Texture3D::load_image");
 152
 153         PixelStore pstore = PixelStore::from_image(img);
 154         BindRestore _bind_ps(pstore);
 155
 156         image(0, fmt, UNSIGNED_BYTE, img.get_data());
 157 }
 158
 159 void Texture3D::image(const Graphics::Image &img, bool srgb)
 160 {
 161         unsigned w = img.get_width();
 162         unsigned h = img.get_height();
 163         unsigned d = 1;
 164
 165         if(depth)
 166         {
 167                 if(h%depth)
 168                         throw incompatible_data("Texture3D::load_image");
 169                 h /= depth;
 170                 d = depth;
 171         }
 172         else
 173         {
 174                 if(h%w)
 175                         throw incompatible_data("Texture3D::load_image");
 176                 d = h/w;
 177                 h = w;
 178         }
 179
 180         PixelFormat fmt = pixelformat_from_graphics(img.get_format());
 181         if(width==0)
 182                 storage(storage_pixelformat_from_graphics(img.get_format(), srgb), w, h, d);
 183         else if(w!=width || h!=height || d!=depth)
 184                 throw incompatible_data("Texture3D::load_image");
 185
 186         PixelStore pstore = PixelStore::from_image(img);
 187         BindRestore _bind_ps(pstore);
 188
 189         image(0, fmt, UNSIGNED_BYTE, img.get_data());
 190 }
 191
 192 unsigned Texture3D::get_n_levels() const
 193 {
 194         unsigned s = max(width, height);
 195         if(target!=GL_TEXTURE_2D_ARRAY)
 196                 s = max(s, depth);
 197         unsigned n = 0;
 198         for(; s; s>>=1, ++n) ;
 199         return n;
 200 }
 201
 202 void Texture3D::get_level_size(unsigned level, unsigned &w, unsigned &h, unsigned &d) const
 203 {
 204         w >>= level;
 205         h >>= level;
 206         if(target!=GL_TEXTURE_2D_ARRAY)
 207                 d >>= level;
 208
 209         if(!w && (h || d))
 210                 w = 1;
 211         if(!h && (w || d))
 212                 h = 1;
 213         if(!d && (w || h))
 214                 d = 1;
 215 }
 216
 217 UInt64 Texture3D::get_data_size() const
 218 {
 219         return id ? width*height*depth*get_pixel_size(ifmt) : 0;
 220 }
 221
 222
 223 Texture3D::Loader::Loader(Texture3D &t):
 224         DataFile::DerivedObjectLoader<Texture3D, Texture::Loader>(t)
 225 {
 226         init();
 227 }
 228
 229 Texture3D::Loader::Loader(Texture3D &t, Collection &c):
 230         DataFile::DerivedObjectLoader<Texture3D, Texture::Loader>(t, c)
 231 {
 232         init();
 233 }
 234
 235 void Texture3D::Loader::init()
 236 {
 237         add("raw_data", &Loader::raw_data);
 238         add("storage", &Loader::storage);
 239 }
 240
 241 void Texture3D::Loader::raw_data(const string &data)
 242 {
 243         obj.image(0, get_base_pixelformat(obj.ifmt), UNSIGNED_BYTE, data.data());
 244 }
 245
 246 void Texture3D::Loader::storage(PixelFormat fmt, unsigned w, unsigned h, unsigned d)
 247 {
 248         if(srgb)
 249                 fmt = get_srgb_pixelformat(fmt);
 250         obj.storage(fmt, w, h, d);
 251 }
 252
 253 } // namespace GL
 254 } // namespace Msp