source/texture2d.cpp

   1 #include <msp/core/raii.h>
   2 #include <msp/gl/extensions/arb_direct_state_access.h>
   3 #include <msp/gl/extensions/arb_texture_storage.h>
   4 #include <msp/graphics/imageloader.h>
   5 #include "bindable.h"
   6 #include "buffer.h"
   7 #include "error.h"
   8 #include "pixelstore.h"
   9 #include "resources.h"
  10 #include "texture2d.h"
  11
  12 using namespace std;
  13
  14 namespace Msp {
  15 namespace GL {
  16
  17 class Texture2D::AsyncLoader: public Resource::AsyncLoader
  18 {
  19 private:
  20         Texture2D &texture;
  21         IO::Seekable &io;
  22         Buffer pixel_buffer;
  23         char *mapped_address;
  24         Graphics::Image image;
  25         Graphics::ImageLoader *img_loader;
  26         unsigned n_bytes;
  27         int phase;
  28
  29 public:
  30         AsyncLoader(Texture2D &, IO::Seekable &);
  31         ~AsyncLoader();
  32
  33         virtual bool needs_sync() const;
  34         virtual bool process();
  35 };
  36
  37
  38 Texture2D::Texture2D(ResourceManager *m):
  39         Texture(GL_TEXTURE_2D, m),
  40         width(0),
  41         height(0),
  42         allocated(0)
  43 { }
  44
  45 Texture2D::~Texture2D()
  46 {
  47         set_manager(0);
  48 }
  49
  50 void Texture2D::storage(PixelFormat fmt, unsigned wd, unsigned ht, unsigned lv)
  51 {
  52         if(width>0)
  53                 throw invalid_operation("Texture2D::storage");
  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
  65 void Texture2D::allocate(unsigned level)
  66 {
  67         if(width==0 || height==0)
  68                 throw invalid_operation("Texture2D::allocate");
  69         if(level>=levels)
  70                 throw invalid_argument("Texture2D::allocate");
  71         if(allocated&(1<<level))
  72                 return;
  73
  74         if(ARB_texture_storage)
  75         {
  76                 Conditional<BindRestore> _bind(!ARB_direct_state_access, this);
  77                 if(ARB_direct_state_access)
  78                         glTextureStorage2D(id, levels, storage_fmt, width, height);
  79                 else
  80                         glTexStorage2D(target, levels, storage_fmt, width, height);
  81                 apply_swizzle();
  82                 allocated |= (1<<levels)-1;
  83         }
  84         else
  85                 image(level, 0);
  86 }
  87
  88 void Texture2D::image(unsigned level, const void *data)
  89 {
  90         if(width==0 || height==0)
  91                 throw invalid_operation("Texture2D::image");
  92
  93         unsigned w = width;
  94         unsigned h = height;
  95         get_level_size(level, w, h);
  96
  97         if(ARB_texture_storage)
  98                 return sub_image(level, 0, 0, w, h, data);
  99
 100         BindRestore _bind(this);
 101
 102         if(!allocated)
 103         {
 104                 glTexParameteri(target, GL_TEXTURE_MAX_LEVEL, levels-1);
 105                 apply_swizzle();
 106         }
 107
 108         PixelComponents comp = get_components(storage_fmt);
 109         DataType type = get_component_type(storage_fmt);
 110         glTexImage2D(target, level, storage_fmt, w, h, 0, comp, type, data);
 111
 112         allocated |= 1<<level;
 113         if(auto_gen_mipmap && level==0)
 114         {
 115                 generate_mipmap();
 116                 allocated |= (1<<levels)-1;
 117         }
 118 }
 119
 120 void Texture2D::image(unsigned level, PixelComponents comp, DataType type, const void *data)
 121 {
 122         if(comp!=get_components(format) || type!=get_component_type(format))
 123                 throw incompatible_data("Texture2D::image");
 124         image(level, data);
 125 }
 126
 127 void Texture2D::sub_image(unsigned level, int x, int y, unsigned wd, unsigned ht, const void *data)
 128 {
 129         if(width==0 || height==0)
 130                 throw invalid_operation("Texture2D::sub_image");
 131
 132         Conditional<BindRestore> _bind(!ARB_direct_state_access, this);
 133         allocate(level);
 134
 135         PixelComponents comp = get_components(storage_fmt);
 136         DataType type = get_component_type(storage_fmt);
 137         if(ARB_direct_state_access)
 138                 glTextureSubImage2D(id, level, x, y, wd, ht, comp, type, data);
 139         else
 140                 glTexSubImage2D(target, level, x, y, wd, ht, comp, type, data);
 141
 142         if(auto_gen_mipmap && level==0)
 143                 generate_mipmap();
 144 }
 145
 146 void Texture2D::sub_image(unsigned level, int x, int y, unsigned wd, unsigned ht, PixelComponents comp, DataType type, const void *data)
 147 {
 148         if(comp!=get_components(format) || type!=get_component_type(format))
 149                 throw incompatible_data("Texture2D::sub_image");
 150         sub_image(level, x, y, wd, ht, data);
 151 }
 152
 153 void Texture2D::image(const Graphics::Image &img, unsigned lv)
 154 {
 155         image(img, lv, false);
 156 }
 157
 158 void Texture2D::image(const Graphics::Image &img, unsigned lv, bool from_buffer)
 159 {
 160         unsigned w = img.get_width();
 161         unsigned h = img.get_height();
 162         PixelFormat fmt = pixelformat_from_image(img);
 163         if(width==0)
 164                 storage(make_pixelformat(get_components(fmt), get_component_type(fmt), use_srgb_format), w, h, lv);
 165         else if(w!=width || h!=height || (lv && lv!=levels))
 166                 throw incompatible_data("Texture2D::image");
 167
 168         PixelStore pstore = PixelStore::from_image(img);
 169         BindRestore _bind_ps(pstore);
 170
 171         image(0, from_buffer ? 0 : img.get_pixels());
 172 }
 173
 174 unsigned Texture2D::get_n_levels() const
 175 {
 176         unsigned n = 0;
 177         for(unsigned s=max(width, height); s; s>>=1, ++n) ;
 178         return n;
 179 }
 180
 181 void Texture2D::get_level_size(unsigned level, unsigned &w, unsigned &h) const
 182 {
 183         w >>= level;
 184         h >>= level;
 185
 186         if(!w && h)
 187                 w = 1;
 188         else if(!h && w)
 189                 h = 1;
 190 }
 191
 192 Resource::AsyncLoader *Texture2D::load(IO::Seekable &io, const Resources *)
 193 {
 194         AsyncLoader *ldr = new AsyncLoader(*this, io);
 195         return ldr;
 196 }
 197
 198 UInt64 Texture2D::get_data_size() const
 199 {
 200         return id ? width*height*get_pixel_size(format) : 0;
 201 }
 202
 203 void Texture2D::unload()
 204 {
 205         glDeleteTextures(1, &id);
 206         id = 0;
 207         allocated = 0;
 208         default_sampler.unload();
 209 }
 210
 211
 212 Texture2D::Loader::Loader(Texture2D &t):
 213         DataFile::DerivedObjectLoader<Texture2D, Texture::Loader>(t)
 214 {
 215         init();
 216 }
 217
 218 Texture2D::Loader::Loader(Texture2D &t, Collection &c):
 219         DataFile::DerivedObjectLoader<Texture2D, Texture::Loader>(t, c)
 220 {
 221         init();
 222 }
 223
 224 void Texture2D::Loader::init()
 225 {
 226         add("raw_data", &Loader::raw_data);
 227         add("storage", &Loader::storage);
 228         add("storage", &Loader::storage_levels);
 229 }
 230
 231 void Texture2D::Loader::raw_data(const string &data)
 232 {
 233         obj.image(0, data.data());
 234 }
 235
 236 void Texture2D::Loader::storage(PixelFormat fmt, unsigned w, unsigned h)
 237 {
 238         obj.storage(fmt, w, h);
 239 }
 240
 241 void Texture2D::Loader::storage_levels(PixelFormat fmt, unsigned w, unsigned h, unsigned l)
 242 {
 243         obj.storage(fmt, w, h, l);
 244 }
 245
 246
 247 Texture2D::AsyncLoader::AsyncLoader(Texture2D &t, IO::Seekable &i):
 248         texture(t),
 249         io(i),
 250         pixel_buffer(PIXEL_UNPACK_BUFFER),
 251         mapped_address(0),
 252         img_loader(Graphics::ImageLoader::open_io(io)),
 253         phase(0)
 254 { }
 255
 256 Texture2D::AsyncLoader::~AsyncLoader()
 257 {
 258         if(mapped_address)
 259                 pixel_buffer.unmap();
 260         delete img_loader;
 261 }
 262
 263 bool Texture2D::AsyncLoader::needs_sync() const
 264 {
 265         return phase%2;
 266 }
 267
 268 bool Texture2D::AsyncLoader::process()
 269 {
 270         if(phase==0)
 271         {
 272                 image.load_headers(*img_loader);
 273                 n_bytes = image.get_stride()*image.get_height();
 274         }
 275         else if(phase==1)
 276         {
 277                 pixel_buffer.storage(n_bytes);
 278                 mapped_address = reinterpret_cast<char *>(pixel_buffer.map());
 279         }
 280         else if(phase==2)
 281                 image.load_into(*img_loader, mapped_address);
 282         else if(phase==3)
 283         {
 284                 Bind _bind_buf(pixel_buffer, PIXEL_UNPACK_BUFFER);
 285                 mapped_address = 0;
 286                 if(!pixel_buffer.unmap())
 287                 {
 288                         phase = 1;
 289                         return false;
 290                 }
 291
 292                 if(!texture.id)
 293                 {
 294                         if(ARB_direct_state_access)
 295                                 glCreateTextures(texture.target, 1, &texture.id);
 296                         else
 297                                 glGenTextures(1, &texture.id);
 298                 }
 299                 texture.image(image, 0, true);
 300         }
 301
 302         ++phase;
 303         return phase>3;
 304 }
 305
 306 } // namespace GL
 307 } // namespace Msp