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 "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 }
 120
 121 void Texture2D::sub_image(unsigned level, int x, int y, unsigned wd, unsigned ht, const void *data)
 122 {
 123         if(width==0 || height==0)
 124                 throw invalid_operation("Texture2D::sub_image");
 125         if(level>=levels)
 126                 throw out_of_range("Texture2D::sub_image");
 127
 128         allocate(level);
 129
 130         GLenum comp = get_gl_components(get_components(storage_fmt));
 131         GLenum type = get_gl_type(get_component_type(storage_fmt));
 132         if(ARB_direct_state_access)
 133                 glTextureSubImage2D(id, level, x, y, wd, ht, comp, type, data);
 134         else
 135         {
 136                 bind_scratch();
 137                 glTexSubImage2D(target, level, x, y, wd, ht, comp, type, data);
 138         }
 139 }
 140
 141 void Texture2D::image(const Graphics::Image &img, unsigned lv)
 142 {
 143         image(img, lv, false);
 144 }
 145
 146 void Texture2D::image(const Graphics::Image &img, unsigned lv, bool from_buffer)
 147 {
 148         unsigned w = img.get_width();
 149         unsigned h = img.get_height();
 150         PixelFormat fmt = pixelformat_from_image(img);
 151         storage(make_pixelformat(get_components(fmt), get_component_type(fmt), use_srgb_format), w, h, lv);
 152
 153         image(0, from_buffer ? 0 : img.get_pixels());
 154 }
 155
 156 unsigned Texture2D::get_n_levels() const
 157 {
 158         unsigned n = 0;
 159         for(unsigned s=max(width, height); s; s>>=1, ++n) ;
 160         return n;
 161 }
 162
 163 LinAl::Vector<unsigned, 2> Texture2D::get_level_size(unsigned level) const
 164 {
 165         unsigned w = width>>level;
 166         unsigned h = height>>level;
 167
 168         if(!w && h)
 169                 w = 1;
 170         else if(!h && w)
 171                 h = 1;
 172
 173         return LinAl::Vector<unsigned, 2>(w, h);
 174 }
 175
 176 Resource::AsyncLoader *Texture2D::load(IO::Seekable &io, const Resources *)
 177 {
 178         AsyncLoader *ldr = new AsyncLoader(*this, io);
 179         return ldr;
 180 }
 181
 182 uint64_t Texture2D::get_data_size() const
 183 {
 184         return id ? width*height*get_pixel_size(format) : 0;
 185 }
 186
 187 void Texture2D::unload()
 188 {
 189         glDeleteTextures(1, &id);
 190         id = 0;
 191         allocated = 0;
 192 }
 193
 194
 195 Texture2D::Loader::Loader(Texture2D &t):
 196         DataFile::DerivedObjectLoader<Texture2D, Texture::Loader>(t)
 197 {
 198         init();
 199 }
 200
 201 Texture2D::Loader::Loader(Texture2D &t, Collection &c):
 202         DataFile::DerivedObjectLoader<Texture2D, Texture::Loader>(t, c)
 203 {
 204         init();
 205 }
 206
 207 void Texture2D::Loader::init()
 208 {
 209         add("raw_data", &Loader::raw_data);
 210         add("storage", &Loader::storage);
 211         add("storage", &Loader::storage_levels);
 212 }
 213
 214 void Texture2D::Loader::raw_data(const string &data)
 215 {
 216         if(obj.manager)
 217         {
 218                 obj.set_manager(0);
 219                 if(!obj.id)
 220                         obj.generate_id();
 221         }
 222         obj.image(0, data.data());
 223 }
 224
 225 void Texture2D::Loader::storage(PixelFormat fmt, unsigned w, unsigned h)
 226 {
 227         obj.storage(fmt, w, h);
 228 }
 229
 230 void Texture2D::Loader::storage_levels(PixelFormat fmt, unsigned w, unsigned h, unsigned l)
 231 {
 232         obj.storage(fmt, w, h, l);
 233 }
 234
 235
 236 Texture2D::AsyncLoader::AsyncLoader(Texture2D &t, IO::Seekable &i):
 237         texture(t),
 238         io(i),
 239         mapped_address(0),
 240         img_loader(Graphics::ImageLoader::open_io(io)),
 241         phase(0)
 242 { }
 243
 244 Texture2D::AsyncLoader::~AsyncLoader()
 245 {
 246         if(mapped_address)
 247                 pixel_buffer.unmap();
 248         delete img_loader;
 249 }
 250
 251 bool Texture2D::AsyncLoader::needs_sync() const
 252 {
 253         return phase%2;
 254 }
 255
 256 bool Texture2D::AsyncLoader::process()
 257 {
 258         if(phase==0)
 259         {
 260                 image.load_headers(*img_loader);
 261                 n_bytes = image.get_stride()*image.get_height();
 262         }
 263         else if(phase==1)
 264         {
 265                 pixel_buffer.storage(n_bytes);
 266                 mapped_address = reinterpret_cast<char *>(pixel_buffer.map());
 267         }
 268         else if(phase==2)
 269                 image.load_into(*img_loader, mapped_address);
 270         else if(phase==3)
 271         {
 272                 mapped_address = 0;
 273                 if(!pixel_buffer.unmap())
 274                 {
 275                         phase = 1;
 276                         return false;
 277                 }
 278
 279                 if(!texture.id)
 280                         texture.generate_id();
 281                 glBindBuffer(GL_PIXEL_UNPACK_BUFFER, pixel_buffer.get_id());
 282                 texture.image(image, 0, true);
 283                 glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
 284                 if(texture.auto_gen_mipmap)
 285                         texture.generate_mipmap();
 286         }
 287
 288         ++phase;
 289         return phase>3;
 290 }
 291
 292 } // namespace GL
 293 } // namespace Msp