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, unsigned lv)
  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         levels = get_n_levels();
  48         if(lv>0)
  49                 levels = min(levels, lv);
  50 }
  51
  52 void Texture3D::allocate(unsigned level)
  53 {
  54         if(width==0 || height==0 || depth==0)
  55                 throw invalid_operation("Texture3D::allocate");
  56         if(level>=levels)
  57                 throw invalid_argument("Texture3D::allocate");
  58         if(allocated&(1<<level))
  59                 return;
  60
  61         if(ARB_texture_storage)
  62         {
  63                 if(ARB_direct_state_access)
  64                         glTextureStorage3D(id, levels, ifmt, width, height, depth);
  65                 else
  66                 {
  67                         BindRestore _bind(this);
  68                         glTexStorage3D(target, levels, ifmt, width, height, depth);
  69                 }
  70                 allocated |= (1<<levels)-1;
  71         }
  72         else
  73         {
  74                 PixelFormat base_fmt = get_base_pixelformat(ifmt);
  75                 image(level, base_fmt, get_alloc_type(base_fmt), 0);
  76         }
  77 }
  78
  79 void Texture3D::image(unsigned level, PixelFormat fmt, DataType type, const void *data)
  80 {
  81         if(width==0 || height==0 || depth==0)
  82                 throw invalid_operation("Texture3D::image");
  83
  84         unsigned w = width;
  85         unsigned h = height;
  86         unsigned d = depth;
  87         get_level_size(level, w, h, d);
  88
  89         if(ARB_texture_storage)
  90                 return sub_image(level, 0, 0, 0, w, h, d, fmt, type, data);
  91
  92         BindRestore _bind(this);
  93
  94         if(!allocated)
  95                 glTexParameteri(target, GL_TEXTURE_MAX_LEVEL, levels-1);
  96         glTexImage3D(target, level, ifmt, width, height, depth, 0, get_upload_format(fmt), type, data);
  97
  98         allocated |= 1<<level;
  99         if(auto_gen_mipmap && level==0)
 100         {
 101                 generate_mipmap();
 102                 allocated |= (1<<levels)-1;
 103         }
 104 }
 105
 106 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)
 107 {
 108         if(width==0 || height==0 || depth==0)
 109                 throw invalid_operation("Texture3D::image");
 110
 111         Conditional<BindRestore> _bind(!ARB_direct_state_access, this);
 112         allocate(level);
 113
 114         fmt = get_upload_format(fmt);
 115         if(ARB_direct_state_access)
 116                 glTextureSubImage3D(id, level, x, y, z, wd, ht, dp, fmt, type, data);
 117         else
 118                 glTexSubImage3D(target, level, x, y, z, wd, ht, dp, fmt, type, data);
 119
 120         if(auto_gen_mipmap && level==0)
 121                 generate_mipmap();
 122 }
 123
 124 void Texture3D::load_image(const string &fn, int dp)
 125 {
 126         Graphics::Image img;
 127         img.load_file(fn);
 128
 129         unsigned w = img.get_width();
 130         unsigned h = img.get_height();
 131         unsigned d = 1;
 132
 133         if(dp==-1)
 134         {
 135                 if(h%w)
 136                         throw incompatible_data("Texture3D::load_image");
 137                 d = h/w;
 138                 h = w;
 139         }
 140         else if(dp==-2)
 141         {
 142                 for(d=h; d*d>h; d>>=2) ;
 143                 for(; d*d<h; ++d) ;
 144                 if(d*d!=h)
 145                         throw incompatible_data("Texture3D::load_image");
 146                 h = d;
 147         }
 148         else if(dp>0)
 149         {
 150                 d = dp;
 151                 if(h%d)
 152                         throw incompatible_data("Texture3D::load_image");
 153                 h /= d;
 154         }
 155         else
 156                 throw invalid_argument("Texture3D::load_image");
 157
 158         PixelFormat fmt = pixelformat_from_graphics(img.get_format());
 159         if(width==0)
 160                 storage(storage_pixelformat_from_graphics(img.get_format()), w, h, d);
 161         else if(w!=width || h!=height || d!=depth)
 162                 throw incompatible_data("Texture3D::load_image");
 163
 164         PixelStore pstore = PixelStore::from_image(img);
 165         BindRestore _bind_ps(pstore);
 166
 167         image(0, fmt, UNSIGNED_BYTE, img.get_data());
 168 }
 169
 170 void Texture3D::image(const Graphics::Image &img, unsigned lv, bool srgb)
 171 {
 172         unsigned w = img.get_width();
 173         unsigned h = img.get_height();
 174         unsigned d = 1;
 175
 176         if(depth)
 177         {
 178                 if(h%depth)
 179                         throw incompatible_data("Texture3D::load_image");
 180                 h /= depth;
 181                 d = depth;
 182         }
 183         else
 184         {
 185                 if(h%w)
 186                         throw incompatible_data("Texture3D::load_image");
 187                 d = h/w;
 188                 h = w;
 189         }
 190
 191         PixelFormat fmt = pixelformat_from_graphics(img.get_format());
 192         if(width==0)
 193                 storage(storage_pixelformat_from_graphics(img.get_format(), srgb), w, h, d, lv);
 194         else if(w!=width || h!=height || d!=depth)
 195                 throw incompatible_data("Texture3D::load_image");
 196
 197         PixelStore pstore = PixelStore::from_image(img);
 198         BindRestore _bind_ps(pstore);
 199
 200         image(0, fmt, UNSIGNED_BYTE, img.get_data());
 201 }
 202
 203 unsigned Texture3D::get_n_levels() const
 204 {
 205         unsigned s = max(width, height);
 206         if(target!=GL_TEXTURE_2D_ARRAY)
 207                 s = max(s, depth);
 208         unsigned n = 0;
 209         for(; s; s>>=1, ++n) ;
 210         return n;
 211 }
 212
 213 void Texture3D::get_level_size(unsigned level, unsigned &w, unsigned &h, unsigned &d) const
 214 {
 215         w >>= level;
 216         h >>= level;
 217         if(target!=GL_TEXTURE_2D_ARRAY)
 218                 d >>= level;
 219
 220         if(!w && (h || d))
 221                 w = 1;
 222         if(!h && (w || d))
 223                 h = 1;
 224         if(!d && (w || h))
 225                 d = 1;
 226 }
 227
 228 UInt64 Texture3D::get_data_size() const
 229 {
 230         return id ? width*height*depth*get_pixel_size(ifmt) : 0;
 231 }
 232
 233
 234 Texture3D::Loader::Loader(Texture3D &t):
 235         DataFile::DerivedObjectLoader<Texture3D, Texture::Loader>(t)
 236 {
 237         init();
 238 }
 239
 240 Texture3D::Loader::Loader(Texture3D &t, Collection &c):
 241         DataFile::DerivedObjectLoader<Texture3D, Texture::Loader>(t, c)
 242 {
 243         init();
 244 }
 245
 246 void Texture3D::Loader::init()
 247 {
 248         add("raw_data", &Loader::raw_data);
 249         add("storage", &Loader::storage);
 250 }
 251
 252 void Texture3D::Loader::raw_data(const string &data)
 253 {
 254         obj.image(0, get_base_pixelformat(obj.ifmt), UNSIGNED_BYTE, data.data());
 255 }
 256
 257 void Texture3D::Loader::storage(PixelFormat fmt, unsigned w, unsigned h, unsigned d)
 258 {
 259         obj.storage(fmt, w, h, d);
 260 }
 261
 262 } // namespace GL
 263 } // namespace Msp