source/texture3d.cpp

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