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                 Conditional<BindRestore> _bind(!ARB_direct_state_access, this);
  64                 if(ARB_direct_state_access)
  65                         glTextureStorage3D(id, levels, ifmt, width, height, depth);
  66                 else
  67                         glTexStorage3D(target, levels, ifmt, width, height, depth);
  68                 apply_swizzle();
  69                 allocated |= (1<<levels)-1;
  70         }
  71         else
  72                 image(level, get_components(ifmt), get_component_type(ifmt), 0);
  73 }
  74
  75 void Texture3D::image(unsigned level, PixelComponents comp, DataType type, const void *data)
  76 {
  77         if(width==0 || height==0 || depth==0)
  78                 throw invalid_operation("Texture3D::image");
  79
  80         unsigned w = width;
  81         unsigned h = height;
  82         unsigned d = depth;
  83         get_level_size(level, w, h, d);
  84
  85         if(ARB_texture_storage)
  86                 return sub_image(level, 0, 0, 0, w, h, d, comp, type, data);
  87
  88         BindRestore _bind(this);
  89
  90         if(!allocated)
  91         {
  92                 glTexParameteri(target, GL_TEXTURE_MAX_LEVEL, levels-1);
  93                 apply_swizzle();
  94         }
  95         glTexImage3D(target, level, ifmt, width, height, depth, 0, get_upload_components(comp), type, data);
  96
  97         allocated |= 1<<level;
  98         if(auto_gen_mipmap && level==0)
  99         {
 100                 generate_mipmap();
 101                 allocated |= (1<<levels)-1;
 102         }
 103 }
 104
 105 void Texture3D::sub_image(unsigned level, int x, int y, int z, unsigned wd, unsigned ht, unsigned dp, PixelComponents comp, DataType type, const void *data)
 106 {
 107         if(width==0 || height==0 || depth==0)
 108                 throw invalid_operation("Texture3D::image");
 109
 110         Conditional<BindRestore> _bind(!ARB_direct_state_access, this);
 111         allocate(level);
 112
 113         comp = get_upload_components(comp);
 114         if(ARB_direct_state_access)
 115                 glTextureSubImage3D(id, level, x, y, z, wd, ht, dp, comp, type, data);
 116         else
 117                 glTexSubImage3D(target, level, x, y, z, wd, ht, dp, comp, type, data);
 118
 119         if(auto_gen_mipmap && level==0)
 120                 generate_mipmap();
 121 }
 122
 123 void Texture3D::image(const Graphics::Image &img, unsigned lv, bool srgb)
 124 {
 125         unsigned w = img.get_width();
 126         unsigned h = img.get_height();
 127         unsigned d = 1;
 128
 129         if(depth)
 130         {
 131                 if(h%depth)
 132                         throw incompatible_data("Texture3D::load_image");
 133                 h /= depth;
 134                 d = depth;
 135         }
 136         else
 137         {
 138                 if(h%w)
 139                         throw incompatible_data("Texture3D::load_image");
 140                 d = h/w;
 141                 h = w;
 142         }
 143
 144         PixelFormat fmt = pixelformat_from_image(img);
 145         PixelComponents comp = get_components(fmt);
 146         DataType type = get_component_type(fmt);
 147         if(width==0)
 148                 storage(make_pixelformat(comp, type, srgb), w, h, d, lv);
 149         else if(w!=width || h!=height || d!=depth)
 150                 throw incompatible_data("Texture3D::load_image");
 151
 152         PixelStore pstore = PixelStore::from_image(img);
 153         BindRestore _bind_ps(pstore);
 154
 155         image(0, comp, type, img.get_data());
 156 }
 157
 158 unsigned Texture3D::get_n_levels() const
 159 {
 160         unsigned s = max(width, height);
 161         if(target!=GL_TEXTURE_2D_ARRAY)
 162                 s = max(s, depth);
 163         unsigned n = 0;
 164         for(; s; s>>=1, ++n) ;
 165         return n;
 166 }
 167
 168 void Texture3D::get_level_size(unsigned level, unsigned &w, unsigned &h, unsigned &d) const
 169 {
 170         w >>= level;
 171         h >>= level;
 172         if(target!=GL_TEXTURE_2D_ARRAY)
 173                 d >>= level;
 174
 175         if(!w && (h || d))
 176                 w = 1;
 177         if(!h && (w || d))
 178                 h = 1;
 179         if(!d && (w || h))
 180                 d = 1;
 181 }
 182
 183 UInt64 Texture3D::get_data_size() const
 184 {
 185         return id ? width*height*depth*get_pixel_size(ifmt) : 0;
 186 }
 187
 188
 189 Texture3D::Loader::Loader(Texture3D &t):
 190         DataFile::DerivedObjectLoader<Texture3D, Texture::Loader>(t)
 191 {
 192         init();
 193 }
 194
 195 Texture3D::Loader::Loader(Texture3D &t, Collection &c):
 196         DataFile::DerivedObjectLoader<Texture3D, Texture::Loader>(t, c)
 197 {
 198         init();
 199 }
 200
 201 void Texture3D::Loader::init()
 202 {
 203         add("raw_data", &Loader::raw_data);
 204         add("storage", &Loader::storage);
 205         add("storage", &Loader::storage_levels);
 206 }
 207
 208 void Texture3D::Loader::raw_data(const string &data)
 209 {
 210         obj.image(0, get_components(obj.ifmt), get_component_type(obj.ifmt), data.data());
 211 }
 212
 213 void Texture3D::Loader::storage(PixelFormat fmt, unsigned w, unsigned h, unsigned d)
 214 {
 215         obj.storage(fmt, w, h, d);
 216 }
 217
 218 void Texture3D::Loader::storage_levels(PixelFormat fmt, unsigned w, unsigned h, unsigned d, unsigned l)
 219 {
 220         obj.storage(fmt, w, h, d, l);
 221 }
 222
 223 } // namespace GL
 224 } // namespace Msp