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