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                 image(level, get_components(ifmt), get_component_type(ifmt), 0);
  85 }
  86
  87 void Texture2D::image(unsigned level, PixelComponents comp, DataType type, const void *data)
  88 {
  89         if(width==0 || height==0)
  90                 throw invalid_operation("Texture2D::image");
  91
  92         unsigned w = width;
  93         unsigned h = height;
  94         get_level_size(level, w, h);
  95
  96         if(ARB_texture_storage)
  97                 return sub_image(level, 0, 0, w, h, comp, type, data);
  98
  99         BindRestore _bind(this);
 100
 101         if(!allocated)
 102         {
 103                 glTexParameteri(target, GL_TEXTURE_MAX_LEVEL, levels-1);
 104                 apply_swizzle();
 105         }
 106         glTexImage2D(target, level, ifmt, w, h, 0, get_upload_components(comp), type, data);
 107
 108         allocated |= 1<<level;
 109         if(auto_gen_mipmap && level==0)
 110         {
 111                 generate_mipmap();
 112                 allocated |= (1<<levels)-1;
 113         }
 114 }
 115
 116 void Texture2D::sub_image(unsigned level, int x, int y, unsigned wd, unsigned ht, PixelComponents comp, DataType type, const void *data)
 117 {
 118         if(width==0 || height==0)
 119                 throw invalid_operation("Texture2D::sub_image");
 120
 121         Conditional<BindRestore> _bind(!ARB_direct_state_access, this);
 122         allocate(level);
 123
 124         comp = get_upload_components(comp);
 125         if(ARB_direct_state_access)
 126                 glTextureSubImage2D(id, level, x, y, wd, ht, comp, type, data);
 127         else
 128                 glTexSubImage2D(target, level, x, y, wd, ht, comp, type, data);
 129
 130         if(auto_gen_mipmap && level==0)
 131                 generate_mipmap();
 132 }
 133
 134 void Texture2D::image(const Graphics::Image &img, unsigned lv, bool srgb)
 135 {
 136         image(img, lv, srgb, false);
 137 }
 138
 139 void Texture2D::image(const Graphics::Image &img, unsigned lv, bool srgb, bool from_buffer)
 140 {
 141         unsigned w = img.get_width();
 142         unsigned h = img.get_height();
 143         PixelFormat fmt = pixelformat_from_image(img);
 144         PixelComponents comp = get_components(fmt);
 145         DataType type = get_component_type(fmt);
 146         if(width==0)
 147                 storage(make_pixelformat(comp, type, srgb), w, h, lv);
 148         else if(w!=width || h!=height || (lv && lv!=levels))
 149                 throw incompatible_data("Texture2D::image");
 150
 151         PixelStore pstore = PixelStore::from_image(img);
 152         BindRestore _bind_ps(pstore);
 153
 154         image(0, comp, type, from_buffer ? 0 : img.get_data());
 155 }
 156
 157 unsigned Texture2D::get_n_levels() const
 158 {
 159         unsigned n = 0;
 160         for(unsigned s=max(width, height); s; s>>=1, ++n) ;
 161         return n;
 162 }
 163
 164 void Texture2D::get_level_size(unsigned level, unsigned &w, unsigned &h) const
 165 {
 166         w >>= level;
 167         h >>= level;
 168
 169         if(!w && h)
 170                 w = 1;
 171         else if(!h && w)
 172                 h = 1;
 173 }
 174
 175 Resource::AsyncLoader *Texture2D::load(IO::Seekable &io, const Resources *res)
 176 {
 177         AsyncLoader *ldr = new AsyncLoader(*this, io);
 178         if(res)
 179                 ldr->set_srgb_conversion(res->get_srgb_conversion());
 180         return ldr;
 181 }
 182
 183 UInt64 Texture2D::get_data_size() const
 184 {
 185         return id ? width*height*get_pixel_size(ifmt) : 0;
 186 }
 187
 188 void Texture2D::unload()
 189 {
 190         glDeleteTextures(1, &id);
 191         id = 0;
 192         allocated = 0;
 193         default_sampler.unload();
 194 }
 195
 196
 197 Texture2D::Loader::Loader(Texture2D &t):
 198         DataFile::DerivedObjectLoader<Texture2D, Texture::Loader>(t)
 199 {
 200         init();
 201 }
 202
 203 Texture2D::Loader::Loader(Texture2D &t, Collection &c):
 204         DataFile::DerivedObjectLoader<Texture2D, Texture::Loader>(t, c)
 205 {
 206         init();
 207 }
 208
 209 void Texture2D::Loader::init()
 210 {
 211         add("raw_data", &Loader::raw_data);
 212         add("storage", &Loader::storage);
 213         add("storage", &Loader::storage_levels);
 214 }
 215
 216 void Texture2D::Loader::raw_data(const string &data)
 217 {
 218         obj.image(0, get_components(obj.ifmt), get_component_type(obj.ifmt), data.data());
 219 }
 220
 221 void Texture2D::Loader::storage(PixelFormat fmt, unsigned w, unsigned h)
 222 {
 223         obj.storage(fmt, w, h);
 224 }
 225
 226 void Texture2D::Loader::storage_levels(PixelFormat fmt, unsigned w, unsigned h, unsigned l)
 227 {
 228         obj.storage(fmt, w, h, l);
 229 }
 230
 231
 232 Texture2D::AsyncLoader::AsyncLoader(Texture2D &t, IO::Seekable &i):
 233         texture(t),
 234         io(i),
 235         srgb_conversion(false),
 236         pixel_buffer(PIXEL_UNPACK_BUFFER),
 237         mapped_address(0),
 238         phase(0)
 239 { }
 240
 241 void Texture2D::AsyncLoader::set_srgb_conversion(bool c)
 242 {
 243         srgb_conversion = c;
 244 }
 245
 246 bool Texture2D::AsyncLoader::needs_sync() const
 247 {
 248         return phase%2;
 249 }
 250
 251 bool Texture2D::AsyncLoader::process()
 252 {
 253         if(phase==0)
 254         {
 255                 /* TODO Enhance the ImageLoader system so that the image can be loaded
 256                 directly to the buffer */
 257                 image.load_io(io);
 258                 n_bytes = image.get_stride()*image.get_height();
 259         }
 260         else if(phase==1)
 261         {
 262                 pixel_buffer.storage(n_bytes);
 263                 mapped_address = reinterpret_cast<char *>(pixel_buffer.map());
 264         }
 265         else if(phase==2)
 266         {
 267                 const char *data = reinterpret_cast<const char *>(image.get_data());
 268                 copy(data, data+n_bytes, mapped_address);
 269         }
 270         else if(phase==3)
 271         {
 272                 Bind _bind_buf(pixel_buffer, PIXEL_UNPACK_BUFFER);
 273                 if(!pixel_buffer.unmap())
 274                 {
 275                         phase = 1;
 276                         return false;
 277                 }
 278
 279                 if(!texture.id)
 280                 {
 281                         if(ARB_direct_state_access)
 282                                 glCreateTextures(texture.target, 1, &texture.id);
 283                         else
 284                                 glGenTextures(1, &texture.id);
 285                 }
 286                 texture.image(image, 0, srgb_conversion, true);
 287         }
 288
 289         ++phase;
 290         return phase>3;
 291 }
 292
 293 } // namespace GL
 294 } // namespace Msp