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