source/core/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 "buffer.h"
   6 #include "error.h"
   7 #include "resources.h"
   8 #include "texture2d.h"
   9
  10 using namespace std;
  11
  12 namespace Msp {
  13 namespace GL {
  14
  15 class Texture2D::AsyncLoader: public Resource::AsyncLoader
  16 {
  17 private:
  18         Texture2D &texture;
  19         IO::Seekable &io;
  20         Buffer pixel_buffer;
  21         char *mapped_address;
  22         Graphics::Image image;
  23         Graphics::ImageLoader *img_loader;
  24         unsigned n_bytes;
  25         int phase;
  26
  27 public:
  28         AsyncLoader(Texture2D &, IO::Seekable &);
  29         ~AsyncLoader();
  30
  31         virtual bool needs_sync() const;
  32         virtual bool process();
  33 };
  34
  35
  36 Texture2D::Texture2D(ResourceManager *m):
  37         Texture(GL_TEXTURE_2D, m),
  38         width(0),
  39         height(0),
  40         allocated(0)
  41 { }
  42
  43 Texture2D::~Texture2D()
  44 {
  45         set_manager(0);
  46 }
  47
  48 void Texture2D::storage(PixelFormat fmt, unsigned wd, unsigned ht, unsigned lv)
  49 {
  50         if(width>0)
  51         {
  52                 if(fmt!=format || wd!=width || ht!=height || (lv && lv!=levels))
  53                         throw incompatible_data("Texture2D::storage");
  54                 return;
  55         }
  56         if(wd==0 || ht==0)
  57                 throw invalid_argument("Texture2D::storage");
  58
  59         set_format(fmt);
  60         width = wd;
  61         height = ht;
  62         levels = get_n_levels();
  63         if(lv>0)
  64                 levels = min(levels, lv);
  65 }
  66
  67 void Texture2D::allocate(unsigned level)
  68 {
  69         if(width==0 || height==0)
  70                 throw invalid_operation("Texture2D::allocate");
  71         if(level>=levels)
  72                 throw invalid_argument("Texture2D::allocate");
  73         if(allocated&(1<<level))
  74                 return;
  75
  76         if(ARB_texture_storage)
  77         {
  78                 GLenum fmt = get_gl_pixelformat(storage_fmt);
  79                 if(ARB_direct_state_access)
  80                         glTextureStorage2D(id, levels, fmt, width, height);
  81                 else
  82                 {
  83                         bind_scratch();
  84                         glTexStorage2D(target, levels, fmt, width, height);
  85                 }
  86                 apply_swizzle();
  87                 allocated |= (1<<levels)-1;
  88         }
  89         else
  90                 image(level, 0);
  91 }
  92
  93 void Texture2D::image(unsigned level, const void *data)
  94 {
  95         if(width==0 || height==0)
  96                 throw invalid_operation("Texture2D::image");
  97         if(level>=levels)
  98                 throw out_of_range("Texture2D::image");
  99
 100         LinAl::Vector<unsigned, 2> size = get_level_size(level);
 101
 102         if(ARB_texture_storage)
 103                 return sub_image(level, 0, 0, size.x, size.y, data);
 104
 105         bind_scratch();
 106
 107         if(!allocated)
 108         {
 109                 glTexParameteri(target, GL_TEXTURE_MAX_LEVEL, levels-1);
 110                 apply_swizzle();
 111         }
 112
 113         GLenum fmt = get_gl_pixelformat(storage_fmt);
 114         GLenum comp = get_gl_components(get_components(storage_fmt));
 115         GLenum type = get_gl_type(get_component_type(storage_fmt));
 116         glTexImage2D(target, level, fmt, size.x, size.y, 0, comp, type, data);
 117
 118         allocated |= 1<<level;
 119         if(auto_gen_mipmap && level==0)
 120         {
 121                 generate_mipmap();
 122                 allocated |= (1<<levels)-1;
 123         }
 124 }
 125
 126 void Texture2D::image(unsigned level, PixelComponents comp, DataType type, const void *data)
 127 {
 128         if(comp!=get_components(format) || type!=get_component_type(format))
 129                 throw incompatible_data("Texture2D::image");
 130         image(level, data);
 131 }
 132
 133 void Texture2D::sub_image(unsigned level, int x, int y, unsigned wd, unsigned ht, const void *data)
 134 {
 135         if(width==0 || height==0)
 136                 throw invalid_operation("Texture2D::sub_image");
 137         if(level>=levels)
 138                 throw out_of_range("Texture2D::sub_image");
 139
 140         allocate(level);
 141
 142         GLenum comp = get_gl_components(get_components(storage_fmt));
 143         GLenum type = get_gl_type(get_component_type(storage_fmt));
 144         if(ARB_direct_state_access)
 145                 glTextureSubImage2D(id, level, x, y, wd, ht, comp, type, data);
 146         else
 147         {
 148                 bind_scratch();
 149                 glTexSubImage2D(target, level, x, y, wd, ht, comp, type, data);
 150         }
 151
 152         if(auto_gen_mipmap && level==0)
 153                 generate_mipmap();
 154 }
 155
 156 void Texture2D::sub_image(unsigned level, int x, int y, unsigned wd, unsigned ht, PixelComponents comp, DataType type, const void *data)
 157 {
 158         if(comp!=get_components(format) || type!=get_component_type(format))
 159                 throw incompatible_data("Texture2D::sub_image");
 160         sub_image(level, x, y, wd, ht, data);
 161 }
 162
 163 void Texture2D::image(const Graphics::Image &img, unsigned lv)
 164 {
 165         image(img, lv, false);
 166 }
 167
 168 void Texture2D::image(const Graphics::Image &img, unsigned lv, bool from_buffer)
 169 {
 170         unsigned w = img.get_width();
 171         unsigned h = img.get_height();
 172         PixelFormat fmt = pixelformat_from_image(img);
 173         storage(make_pixelformat(get_components(fmt), get_component_type(fmt), use_srgb_format), w, h, lv);
 174
 175         image(0, from_buffer ? 0 : img.get_pixels());
 176 }
 177
 178 unsigned Texture2D::get_n_levels() const
 179 {
 180         unsigned n = 0;
 181         for(unsigned s=max(width, height); s; s>>=1, ++n) ;
 182         return n;
 183 }
 184
 185 LinAl::Vector<unsigned, 2> Texture2D::get_level_size(unsigned level) const
 186 {
 187         unsigned w = width>>level;
 188         unsigned h = height>>level;
 189
 190         if(!w && h)
 191                 w = 1;
 192         else if(!h && w)
 193                 h = 1;
 194
 195         return LinAl::Vector<unsigned, 2>(w, h);
 196 }
 197
 198 Resource::AsyncLoader *Texture2D::load(IO::Seekable &io, const Resources *)
 199 {
 200         AsyncLoader *ldr = new AsyncLoader(*this, io);
 201         return ldr;
 202 }
 203
 204 UInt64 Texture2D::get_data_size() const
 205 {
 206         return id ? width*height*get_pixel_size(format) : 0;
 207 }
 208
 209 void Texture2D::unload()
 210 {
 211         glDeleteTextures(1, &id);
 212         id = 0;
 213         allocated = 0;
 214 }
 215
 216
 217 Texture2D::Loader::Loader(Texture2D &t):
 218         DataFile::DerivedObjectLoader<Texture2D, Texture::Loader>(t)
 219 {
 220         init();
 221 }
 222
 223 Texture2D::Loader::Loader(Texture2D &t, Collection &c):
 224         DataFile::DerivedObjectLoader<Texture2D, Texture::Loader>(t, c)
 225 {
 226         init();
 227 }
 228
 229 void Texture2D::Loader::init()
 230 {
 231         add("raw_data", &Loader::raw_data);
 232         add("storage", &Loader::storage);
 233         add("storage", &Loader::storage_levels);
 234 }
 235
 236 void Texture2D::Loader::raw_data(const string &data)
 237 {
 238         if(obj.manager)
 239         {
 240                 obj.set_manager(0);
 241                 if(!obj.id)
 242                         obj.generate_id();
 243         }
 244         obj.image(0, data.data());
 245 }
 246
 247 void Texture2D::Loader::storage(PixelFormat fmt, unsigned w, unsigned h)
 248 {
 249         obj.storage(fmt, w, h);
 250 }
 251
 252 void Texture2D::Loader::storage_levels(PixelFormat fmt, unsigned w, unsigned h, unsigned l)
 253 {
 254         obj.storage(fmt, w, h, l);
 255 }
 256
 257
 258 Texture2D::AsyncLoader::AsyncLoader(Texture2D &t, IO::Seekable &i):
 259         texture(t),
 260         io(i),
 261         mapped_address(0),
 262         img_loader(Graphics::ImageLoader::open_io(io)),
 263         phase(0)
 264 { }
 265
 266 Texture2D::AsyncLoader::~AsyncLoader()
 267 {
 268         if(mapped_address)
 269                 pixel_buffer.unmap();
 270         delete img_loader;
 271 }
 272
 273 bool Texture2D::AsyncLoader::needs_sync() const
 274 {
 275         return phase%2;
 276 }
 277
 278 bool Texture2D::AsyncLoader::process()
 279 {
 280         if(phase==0)
 281         {
 282                 image.load_headers(*img_loader);
 283                 n_bytes = image.get_stride()*image.get_height();
 284         }
 285         else if(phase==1)
 286         {
 287                 pixel_buffer.storage(n_bytes);
 288                 mapped_address = reinterpret_cast<char *>(pixel_buffer.map());
 289         }
 290         else if(phase==2)
 291                 image.load_into(*img_loader, mapped_address);
 292         else if(phase==3)
 293         {
 294                 mapped_address = 0;
 295                 if(!pixel_buffer.unmap())
 296                 {
 297                         phase = 1;
 298                         return false;
 299                 }
 300
 301                 if(!texture.id)
 302                         texture.generate_id();
 303                 glBindBuffer(GL_PIXEL_UNPACK_BUFFER, pixel_buffer.get_id());
 304                 texture.image(image, 0, true);
 305                 glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
 306         }
 307
 308         ++phase;
 309         return phase>3;
 310 }
 311
 312 } // namespace GL
 313 } // namespace Msp