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                 if(ARB_direct_state_access)
  76                         glTextureStorage2D(id, levels, ifmt, width, height);
  77                 else
  78                 {
  79                         BindRestore _bind(this);
  80                         glTexStorage2D(target, levels, ifmt, width, height);
  81                 }
  82                 allocated |= (1<<levels)-1;
  83         }
  84         else
  85         {
  86                 PixelFormat base_fmt = get_base_pixelformat(ifmt);
  87                 image(level, base_fmt, get_alloc_type(base_fmt), 0);
  88         }
  89 }
  90
  91 void Texture2D::image(unsigned level, PixelFormat fmt, DataType type, const void *data)
  92 {
  93         if(width==0 || height==0)
  94                 throw invalid_operation("Texture2D::image");
  95
  96         unsigned w = width;
  97         unsigned h = height;
  98         get_level_size(level, w, h);
  99
 100         if(ARB_texture_storage)
 101                 return sub_image(level, 0, 0, w, h, fmt, type, data);
 102
 103         BindRestore _bind(this);
 104         glTexImage2D(target, level, ifmt, w, h, 0, get_upload_format(fmt), type, data);
 105
 106         allocated |= 1<<level;
 107         if(gen_mipmap && level==0)
 108         {
 109                 auto_generate_mipmap();
 110                 allocated |= (1<<get_n_levels())-1;
 111         }
 112 }
 113
 114 void Texture2D::sub_image(unsigned level, int x, int y, unsigned wd, unsigned ht, PixelFormat fmt, DataType type, const void *data)
 115 {
 116         if(width==0 || height==0)
 117                 throw invalid_operation("Texture2D::sub_image");
 118
 119         Conditional<BindRestore> _bind(!ARB_direct_state_access, this);
 120         allocate(level);
 121
 122         fmt = get_upload_format(fmt);
 123         if(ARB_direct_state_access)
 124                 glTextureSubImage2D(id, level, x, y, wd, ht, fmt, type, data);
 125         else
 126                 glTexSubImage2D(target, level, x, y, wd, ht, fmt, type, data);
 127
 128         if(gen_mipmap && level==0)
 129                 auto_generate_mipmap();
 130 }
 131
 132 void Texture2D::image(const Graphics::Image &img, bool srgb)
 133 {
 134         image(img, srgb, false);
 135 }
 136
 137 void Texture2D::image(const Graphics::Image &img, bool srgb, bool from_buffer)
 138 {
 139         unsigned w = img.get_width();
 140         unsigned h = img.get_height();
 141         PixelFormat fmt = pixelformat_from_graphics(img.get_format());
 142         if(width==0)
 143         {
 144                 unsigned l = (is_mipmapped(min_filter) ? mipmap_levels ? mipmap_levels : 0 : 1);
 145                 storage(storage_pixelformat_from_graphics(img.get_format(), srgb), w, h, l);
 146         }
 147         else if(w!=width || h!=height)
 148                 throw incompatible_data("Texture2D::image");
 149
 150         PixelStore pstore = PixelStore::from_image(img);
 151         BindRestore _bind_ps(pstore);
 152
 153         image(0, fmt, UNSIGNED_BYTE, from_buffer ? 0 : img.get_data());
 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 void Texture2D::get_level_size(unsigned level, unsigned &w, unsigned &h) const
 164 {
 165         w >>= level;
 166         h >>= level;
 167
 168         if(!w && h)
 169                 w = 1;
 170         else if(!h && w)
 171                 h = 1;
 172 }
 173
 174 Resource::AsyncLoader *Texture2D::load(IO::Seekable &io, const Resources *res)
 175 {
 176         AsyncLoader *ldr = new AsyncLoader(*this, io);
 177         if(res)
 178                 ldr->set_srgb_conversion(res->get_srgb_conversion());
 179         return ldr;
 180 }
 181
 182 UInt64 Texture2D::get_data_size() const
 183 {
 184         return id ? width*height*get_pixel_size(ifmt) : 0;
 185 }
 186
 187 void Texture2D::unload()
 188 {
 189         glDeleteTextures(1, &id);
 190         id = 0;
 191         // TODO check which params actually need refreshing
 192         dirty_params = -1;
 193 }
 194
 195
 196 Texture2D::Loader::Loader(Texture2D &t):
 197         DataFile::DerivedObjectLoader<Texture2D, Texture::Loader>(t)
 198 {
 199         init();
 200 }
 201
 202 Texture2D::Loader::Loader(Texture2D &t, Collection &c):
 203         DataFile::DerivedObjectLoader<Texture2D, Texture::Loader>(t, c)
 204 {
 205         init();
 206 }
 207
 208 void Texture2D::Loader::init()
 209 {
 210         add("raw_data", &Loader::raw_data);
 211         add("storage", &Loader::storage);
 212 }
 213
 214 void Texture2D::Loader::raw_data(const string &data)
 215 {
 216         obj.image(0, get_base_pixelformat(obj.ifmt), UNSIGNED_BYTE, data.data());
 217 }
 218
 219 void Texture2D::Loader::storage(PixelFormat fmt, unsigned w, unsigned h)
 220 {
 221         if(srgb)
 222                 fmt = get_srgb_pixelformat(fmt);
 223         obj.storage(fmt, w, h);
 224 }
 225
 226
 227 Texture2D::AsyncLoader::AsyncLoader(Texture2D &t, IO::Seekable &i):
 228         texture(t),
 229         io(i),
 230         srgb_conversion(false),
 231         pixel_buffer(PIXEL_UNPACK_BUFFER),
 232         mapped_address(0),
 233         phase(0)
 234 { }
 235
 236 void Texture2D::AsyncLoader::set_srgb_conversion(bool c)
 237 {
 238         srgb_conversion = c;
 239 }
 240
 241 bool Texture2D::AsyncLoader::needs_sync() const
 242 {
 243         return phase%2;
 244 }
 245
 246 bool Texture2D::AsyncLoader::process()
 247 {
 248         if(phase==0)
 249         {
 250                 /* TODO Enhance the ImageLoader system so that the image can be loaded
 251                 directly to the buffer */
 252                 image.load_io(io);
 253                 n_bytes = image.get_stride()*image.get_height();
 254         }
 255         else if(phase==1)
 256         {
 257                 pixel_buffer.data(n_bytes, 0);
 258                 mapped_address = reinterpret_cast<char *>(pixel_buffer.map(WRITE_ONLY));
 259         }
 260         else if(phase==2)
 261         {
 262                 const char *data = reinterpret_cast<const char *>(image.get_data());
 263                 copy(data, data+n_bytes, mapped_address);
 264         }
 265         else if(phase==3)
 266         {
 267                 Bind _bind_buf(pixel_buffer, PIXEL_UNPACK_BUFFER);
 268                 if(!pixel_buffer.unmap())
 269                 {
 270                         phase = 1;
 271                         return false;
 272                 }
 273
 274                 if(!texture.id)
 275                         glGenTextures(1, &texture.id);
 276                 texture.image(image, srgb_conversion, true);
 277         }
 278
 279         ++phase;
 280         return phase>3;
 281 }
 282
 283 } // namespace GL
 284 } // namespace Msp