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