source/core/texture2d.cpp

   1 #include <msp/gl/extensions/arb_direct_state_access.h>
   2 #include <msp/gl/extensions/arb_texture_storage.h>
   3 #include <msp/gl/extensions/arb_vertex_buffer_object.h>
   4 #include <msp/graphics/imageloader.h>
   5 #include "buffer.h"
   6 #include "error.h"
   7 #include "texture2d.h"
   8
   9 using namespace std;
  10
  11 namespace Msp {
  12 namespace GL {
  13
  14 class Texture2D::AsyncLoader: public Resource::AsyncLoader
  15 {
  16 private:
  17         Texture2D &texture;
  18         IO::Seekable &io;
  19         Buffer pixel_buffer;
  20         char *mapped_address;
  21         Graphics::Image image;
  22         Graphics::ImageLoader *img_loader;
  23         unsigned n_bytes;
  24         int phase;
  25
  26 public:
  27         AsyncLoader(Texture2D &, IO::Seekable &);
  28         ~AsyncLoader();
  29
  30         virtual bool needs_sync() const;
  31         virtual bool process();
  32 };
  33
  34
  35 Texture2D::Texture2D(ResourceManager *m):
  36         Texture(GL_TEXTURE_2D, m),
  37         width(0),
  38         height(0)
  39 { }
  40
  41 Texture2D::~Texture2D()
  42 {
  43         set_manager(0);
  44 }
  45
  46 void Texture2D::storage(PixelFormat fmt, unsigned wd, unsigned ht, unsigned lv)
  47 {
  48         if(width>0)
  49         {
  50                 if(fmt!=format || wd!=width || ht!=height || (lv && lv!=levels))
  51                         throw incompatible_data("Texture2D::storage");
  52                 return;
  53         }
  54         if(wd==0 || ht==0)
  55                 throw invalid_argument("Texture2D::storage");
  56
  57         set_format(fmt);
  58         width = wd;
  59         height = ht;
  60         levels = get_n_levels();
  61         if(lv>0)
  62                 levels = min(levels, lv);
  63
  64         GLenum gl_fmt = get_gl_pixelformat(storage_fmt);
  65         if(ARB_texture_storage)
  66         {
  67                 if(ARB_direct_state_access)
  68                         glTextureStorage2D(id, levels, gl_fmt, width, height);
  69                 else
  70                 {
  71                         bind_scratch();
  72                         glTexStorage2D(target, levels, gl_fmt, width, height);
  73                 }
  74         }
  75         else
  76         {
  77                 bind_scratch();
  78                 glTexParameteri(target, GL_TEXTURE_MAX_LEVEL, levels-1);
  79                 GLenum comp = get_gl_components(get_components(storage_fmt));
  80                 GLenum type = get_gl_type(get_component_type(storage_fmt));
  81                 for(unsigned i=0; i<levels; ++i)
  82                 {
  83                         LinAl::Vector<unsigned, 2> lv_size = get_level_size(i);
  84                         glTexImage2D(target, i, gl_fmt, lv_size.x, lv_size.y, 0, comp, type, 0);
  85                 }
  86         }
  87
  88         apply_swizzle();
  89 }
  90
  91 void Texture2D::image(unsigned level, const void *data)
  92 {
  93         LinAl::Vector<unsigned, 2> size = get_level_size(level);
  94         return sub_image(level, 0, 0, size.x, size.y, data);
  95 }
  96
  97 void Texture2D::sub_image(unsigned level, int x, int y, unsigned wd, unsigned ht, const void *data)
  98 {
  99         if(width==0 || height==0)
 100                 throw invalid_operation("Texture2D::sub_image");
 101         if(level>=levels)
 102                 throw out_of_range("Texture2D::sub_image");
 103
 104         GLenum comp = get_gl_components(get_components(storage_fmt));
 105         GLenum type = get_gl_type(get_component_type(storage_fmt));
 106         if(ARB_direct_state_access)
 107                 glTextureSubImage2D(id, level, x, y, wd, ht, comp, type, data);
 108         else
 109         {
 110                 bind_scratch();
 111                 glTexSubImage2D(target, level, x, y, wd, ht, comp, type, data);
 112         }
 113 }
 114
 115 void Texture2D::sub_image(unsigned level, int x, int y, unsigned wd, unsigned ht, const Buffer &buffer, unsigned offset)
 116 {
 117         glBindBuffer(GL_PIXEL_UNPACK_BUFFER, buffer.id);
 118         sub_image(level, x, y, wd, ht, reinterpret_cast<void *>(offset));
 119         glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
 120 }
 121
 122 void Texture2D::image(const Graphics::Image &img, unsigned lv)
 123 {
 124         storage(pixelformat_from_image(img, use_srgb_format), img.get_width(), img.get_height(), lv);
 125         image(0, img.get_pixels());
 126 }
 127
 128 unsigned Texture2D::get_n_levels() const
 129 {
 130         unsigned n = 0;
 131         for(unsigned s=max(width, height); s; s>>=1, ++n) ;
 132         return n;
 133 }
 134
 135 LinAl::Vector<unsigned, 2> Texture2D::get_level_size(unsigned level) const
 136 {
 137         unsigned w = width>>level;
 138         unsigned h = height>>level;
 139
 140         if(!w && h)
 141                 w = 1;
 142         else if(!h && w)
 143                 h = 1;
 144
 145         return LinAl::Vector<unsigned, 2>(w, h);
 146 }
 147
 148 Resource::AsyncLoader *Texture2D::load(IO::Seekable &io, const Resources *)
 149 {
 150         AsyncLoader *ldr = new AsyncLoader(*this, io);
 151         return ldr;
 152 }
 153
 154 uint64_t Texture2D::get_data_size() const
 155 {
 156         return id ? width*height*get_pixel_size(format) : 0;
 157 }
 158
 159 void Texture2D::unload()
 160 {
 161         glDeleteTextures(1, &id);
 162         id = 0;
 163 }
 164
 165
 166 Texture2D::Loader::Loader(Texture2D &t):
 167         DataFile::DerivedObjectLoader<Texture2D, Texture::Loader>(t)
 168 {
 169         init();
 170 }
 171
 172 Texture2D::Loader::Loader(Texture2D &t, Collection &c):
 173         DataFile::DerivedObjectLoader<Texture2D, Texture::Loader>(t, c)
 174 {
 175         init();
 176 }
 177
 178 void Texture2D::Loader::init()
 179 {
 180         add("raw_data", &Loader::raw_data);
 181         add("storage", &Loader::storage);
 182         add("storage", &Loader::storage_levels);
 183 }
 184
 185 void Texture2D::Loader::raw_data(const string &data)
 186 {
 187         if(obj.manager)
 188         {
 189                 obj.set_manager(0);
 190                 if(!obj.id)
 191                         obj.generate_id();
 192         }
 193         obj.image(0, data.data());
 194 }
 195
 196 void Texture2D::Loader::storage(PixelFormat fmt, unsigned w, unsigned h)
 197 {
 198         obj.storage(fmt, w, h);
 199 }
 200
 201 void Texture2D::Loader::storage_levels(PixelFormat fmt, unsigned w, unsigned h, unsigned l)
 202 {
 203         obj.storage(fmt, w, h, l);
 204 }
 205
 206
 207 Texture2D::AsyncLoader::AsyncLoader(Texture2D &t, IO::Seekable &i):
 208         texture(t),
 209         io(i),
 210         mapped_address(0),
 211         img_loader(Graphics::ImageLoader::open_io(io)),
 212         phase(0)
 213 { }
 214
 215 Texture2D::AsyncLoader::~AsyncLoader()
 216 {
 217         if(mapped_address)
 218                 pixel_buffer.unmap();
 219         delete img_loader;
 220 }
 221
 222 bool Texture2D::AsyncLoader::needs_sync() const
 223 {
 224         return phase%2;
 225 }
 226
 227 bool Texture2D::AsyncLoader::process()
 228 {
 229         if(phase==0)
 230         {
 231                 image.load_headers(*img_loader);
 232                 n_bytes = image.get_stride()*image.get_height();
 233         }
 234         else if(phase==1)
 235         {
 236                 pixel_buffer.storage(n_bytes);
 237                 mapped_address = reinterpret_cast<char *>(pixel_buffer.map());
 238         }
 239         else if(phase==2)
 240                 image.load_into(*img_loader, mapped_address);
 241         else if(phase==3)
 242         {
 243                 mapped_address = 0;
 244                 if(!pixel_buffer.unmap())
 245                 {
 246                         phase = 1;
 247                         return false;
 248                 }
 249
 250                 if(!texture.id)
 251                         texture.generate_id();
 252
 253                 unsigned w = image.get_width();
 254                 unsigned h = image.get_height();
 255                 texture.storage(pixelformat_from_image(image, texture.use_srgb_format), w, h);
 256                 texture.sub_image(0, 0, 0, w, h, pixel_buffer, 0);
 257
 258                 if(texture.auto_gen_mipmap)
 259                         texture.generate_mipmap();
 260         }
 261
 262         ++phase;
 263         return phase>3;
 264 }
 265
 266 } // namespace GL
 267 } // namespace Msp