source/core/texture3d.cpp

   1 #include <cmath>
   2 #include <msp/gl/extensions/arb_direct_state_access.h>
   3 #include <msp/gl/extensions/arb_texture_storage.h>
   4 #include <msp/gl/extensions/ext_texture3d.h>
   5 #include <msp/gl/extensions/ext_texture_array.h>
   6 #include <msp/graphics/image.h>
   7 #include "error.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         width(0),
  18         height(0),
  19         depth(0)
  20 { }
  21
  22 Texture3D::Texture3D():
  23         Texture(GL_TEXTURE_3D),
  24         width(0),
  25         height(0),
  26         depth(0)
  27 {
  28         static Require _req(EXT_texture3D);
  29 }
  30
  31 void Texture3D::storage(PixelFormat fmt, unsigned wd, unsigned ht, unsigned dp, unsigned lv)
  32 {
  33         if(width>0)
  34         {
  35                 if(fmt!=format || wd!=width || ht!=height || dp!=depth || (lv && lv!=levels))
  36                         throw incompatible_data("Texture3D::storage");
  37                 return;
  38         }
  39         if(wd==0 || ht==0 || dp==0)
  40                 throw invalid_argument("Texture3D::storage");
  41
  42         set_format(fmt);
  43         width = wd;
  44         height = ht;
  45         depth = dp;
  46         levels = get_n_levels();
  47         if(lv>0)
  48                 levels = min(levels, lv);
  49
  50         GLenum gl_fmt = get_gl_pixelformat(storage_fmt);
  51         if(ARB_texture_storage)
  52         {
  53                 if(ARB_direct_state_access)
  54                         glTextureStorage3D(id, levels, gl_fmt, width, height, depth);
  55                 else
  56                 {
  57                         bind_scratch();
  58                         glTexStorage3D(target, levels, gl_fmt, width, height, depth);
  59                 }
  60         }
  61         else
  62         {
  63                 bind_scratch();
  64                 GLenum comp = get_gl_components(get_components(storage_fmt));
  65                 GLenum type = get_gl_type(get_component_type(storage_fmt));
  66                 for(unsigned i=0; i<levels; ++i)
  67                 {
  68                         LinAl::Vector<unsigned, 3> lv_size = get_level_size(i);
  69                         glTexImage3D(target, i, gl_fmt, lv_size.x, lv_size.y, lv_size.z, 0, comp, type, 0);
  70                 }
  71                 glTexParameteri(target, GL_TEXTURE_MAX_LEVEL, levels-1);
  72         }
  73
  74         apply_swizzle();
  75 }
  76
  77 void Texture3D::image(unsigned level, const void *data)
  78 {
  79         LinAl::Vector<unsigned, 3> size = get_level_size(level);
  80         return sub_image(level, 0, 0, 0, size.x, size.y, size.z, data);
  81 }
  82
  83 void Texture3D::sub_image(unsigned level, int x, int y, int z, unsigned wd, unsigned ht, unsigned dp, const void *data)
  84 {
  85         if(width==0 || height==0 || depth==0)
  86                 throw invalid_operation("Texture3D::sub_image");
  87         if(level>=levels)
  88                 throw out_of_range("Texture3D::sub_image");
  89
  90         GLenum comp = get_gl_components(get_components(storage_fmt));
  91         GLenum type = get_gl_type(get_component_type(storage_fmt));
  92         if(ARB_direct_state_access)
  93                 glTextureSubImage3D(id, level, x, y, z, wd, ht, dp, comp, type, data);
  94         else
  95         {
  96                 bind_scratch();
  97                 glTexSubImage3D(target, level, x, y, z, wd, ht, dp, comp, type, data);
  98         }
  99 }
 100
 101 void Texture3D::image(const Graphics::Image &img, unsigned lv)
 102 {
 103         unsigned w = img.get_width();
 104         unsigned h = img.get_height();
 105
 106         if(h%w)
 107                 throw incompatible_data("Texture3D::load_image");
 108         unsigned d = h/w;
 109         h = w;
 110
 111         storage(pixelformat_from_image(img, use_srgb_format), w, h, d, lv);
 112         image(0, img.get_pixels());
 113 }
 114
 115 unsigned Texture3D::get_n_levels() const
 116 {
 117         unsigned s = max(width, height);
 118         if(target!=GL_TEXTURE_2D_ARRAY)
 119                 s = max(s, depth);
 120         unsigned n = 0;
 121         for(; s; s>>=1, ++n) ;
 122         return n;
 123 }
 124
 125 LinAl::Vector<unsigned, 3> Texture3D::get_level_size(unsigned level) const
 126 {
 127         unsigned w = width>>level;
 128         unsigned h = height>>level;
 129         unsigned d = depth;
 130         if(target!=GL_TEXTURE_2D_ARRAY)
 131                 d >>= level;
 132
 133         if(!w && (h || d))
 134                 w = 1;
 135         if(!h && (w || d))
 136                 h = 1;
 137         if(!d && (w || h))
 138                 d = 1;
 139
 140         return LinAl::Vector<unsigned, 3>(w, h, d);
 141 }
 142
 143 uint64_t Texture3D::get_data_size() const
 144 {
 145         return id ? width*height*depth*get_pixel_size(storage_fmt) : 0;
 146 }
 147
 148
 149 Texture3D::Loader::Loader(Texture3D &t):
 150         DataFile::DerivedObjectLoader<Texture3D, Texture::Loader>(t)
 151 {
 152         init();
 153 }
 154
 155 Texture3D::Loader::Loader(Texture3D &t, Collection &c):
 156         DataFile::DerivedObjectLoader<Texture3D, Texture::Loader>(t, c)
 157 {
 158         init();
 159 }
 160
 161 void Texture3D::Loader::init()
 162 {
 163         add("raw_data", &Loader::raw_data);
 164         add("storage", &Loader::storage);
 165         add("storage", &Loader::storage_levels);
 166 }
 167
 168 void Texture3D::Loader::raw_data(const string &data)
 169 {
 170         obj.image(0, data.data());
 171 }
 172
 173 void Texture3D::Loader::storage(PixelFormat fmt, unsigned w, unsigned h, unsigned d)
 174 {
 175         obj.storage(fmt, w, h, d);
 176 }
 177
 178 void Texture3D::Loader::storage_levels(PixelFormat fmt, unsigned w, unsigned h, unsigned d, unsigned l)
 179 {
 180         obj.storage(fmt, w, h, d, l);
 181 }
 182
 183 } // namespace GL
 184 } // namespace Msp