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                 allocated |= (1<<get_n_levels())-1;
  78         }
  79 }
  80
  81 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)
  82 {
  83         if(width==0 || height==0 || depth==0)
  84                 throw invalid_operation("Texture3D::image");
  85
  86         allocate(level);
  87
  88         BindRestore _bind(this);
  89         glTexSubImage3D(target, level, x, y, z, wd, ht, dp, fmt, type, data);
  90 }
  91
  92 void Texture3D::load_image(const string &fn, int dp)
  93 {
  94         Graphics::Image img;
  95         img.load_file(fn);
  96
  97         unsigned w = img.get_width();
  98         unsigned h = img.get_height();
  99         unsigned d = 1;
 100
 101         if(dp==-1)
 102         {
 103                 if(h%w)
 104                         throw incompatible_data("Texture3D::load_image");
 105                 d = h/w;
 106                 h = w;
 107         }
 108         else if(dp==-2)
 109         {
 110                 for(d=h; d*d>h; d>>=2) ;
 111                 for(; d*d<h; ++d) ;
 112                 if(d*d!=h)
 113                         throw incompatible_data("Texture3D::load_image");
 114                 h = d;
 115         }
 116         else if(dp>0)
 117         {
 118                 d = dp;
 119                 if(h%d)
 120                         throw incompatible_data("Texture3D::load_image");
 121                 h /= d;
 122         }
 123         else
 124                 throw invalid_argument("Texture3D::load_image");
 125
 126         PixelFormat fmt = pixelformat_from_graphics(img.get_format());
 127         if(width==0)
 128                 storage(storage_pixelformat_from_graphics(img.get_format()), w, h, d);
 129         else if(w!=width || h!=height || d!=depth)
 130                 throw incompatible_data("Texture3D::load_image");
 131
 132         PixelStore pstore = PixelStore::from_image(img);
 133         BindRestore _bind_ps(pstore);
 134
 135         image(0, fmt, UNSIGNED_BYTE, img.get_data());
 136 }
 137
 138 void Texture3D::image(const Graphics::Image &img, bool srgb)
 139 {
 140         unsigned w = img.get_width();
 141         unsigned h = img.get_height();
 142         unsigned d = 1;
 143
 144         if(depth)
 145         {
 146                 if(h%depth)
 147                         throw incompatible_data("Texture3D::load_image");
 148                 h /= depth;
 149                 d = depth;
 150         }
 151         else
 152         {
 153                 if(h%w)
 154                         throw incompatible_data("Texture3D::load_image");
 155                 d = h/w;
 156                 h = w;
 157         }
 158
 159         PixelFormat fmt = pixelformat_from_graphics(img.get_format());
 160         if(width==0)
 161                 storage(storage_pixelformat_from_graphics(img.get_format(), srgb), w, h, d);
 162         else if(w!=width || h!=height || d!=depth)
 163                 throw incompatible_data("Texture3D::load_image");
 164
 165         PixelStore pstore = PixelStore::from_image(img);
 166         BindRestore _bind_ps(pstore);
 167
 168         image(0, fmt, UNSIGNED_BYTE, img.get_data());
 169 }
 170
 171 unsigned Texture3D::get_n_levels() const
 172 {
 173         unsigned s = max(width, height);
 174         if(target!=GL_TEXTURE_2D_ARRAY)
 175                 s = max(s, depth);
 176         unsigned n = 0;
 177         for(; s; s>>=1, ++n) ;
 178         return n;
 179 }
 180
 181 void Texture3D::get_level_size(unsigned level, unsigned &w, unsigned &h, unsigned &d) const
 182 {
 183         w >>= level;
 184         h >>= level;
 185         if(target!=GL_TEXTURE_2D_ARRAY)
 186                 d >>= level;
 187
 188         if(!w && (h || d))
 189                 w = 1;
 190         if(!h && (w || d))
 191                 h = 1;
 192         if(!d && (w || h))
 193                 d = 1;
 194 }
 195
 196 UInt64 Texture3D::get_data_size() const
 197 {
 198         return id ? width*height*depth*get_pixel_size(ifmt) : 0;
 199 }
 200
 201
 202 Texture3D::Loader::Loader(Texture3D &t):
 203         DataFile::DerivedObjectLoader<Texture3D, Texture::Loader>(t)
 204 {
 205         init();
 206 }
 207
 208 Texture3D::Loader::Loader(Texture3D &t, Collection &c):
 209         DataFile::DerivedObjectLoader<Texture3D, Texture::Loader>(t, c)
 210 {
 211         init();
 212 }
 213
 214 void Texture3D::Loader::init()
 215 {
 216         add("raw_data", &Loader::raw_data);
 217         add("storage", &Loader::storage);
 218 }
 219
 220 void Texture3D::Loader::raw_data(const string &data)
 221 {
 222         obj.image(0, get_base_pixelformat(obj.ifmt), UNSIGNED_BYTE, data.data());
 223 }
 224
 225 void Texture3D::Loader::storage(PixelFormat fmt, unsigned w, unsigned h, unsigned d)
 226 {
 227         if(srgb)
 228                 fmt = get_srgb_pixelformat(fmt);
 229         obj.storage(fmt, w, h, d);
 230 }
 231
 232 } // namespace GL
 233 } // namespace Msp