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 { }
  41
  42 Texture2D::~Texture2D()
  43 {
  44         set_manager(0);
  45 }
  46
  47 void Texture2D::storage(PixelFormat fmt, unsigned wd, unsigned ht, unsigned lv)
  48 {
  49         if(width>0)
  50         {
  51                 if(fmt!=format || wd!=width || ht!=height || (lv && lv!=levels))
  52                         throw incompatible_data("Texture2D::storage");
  53                 return;
  54         }
  55         if(wd==0 || ht==0)
  56                 throw invalid_argument("Texture2D::storage");
  57
  58         set_format(fmt);
  59         width = wd;
  60         height = ht;
  61         levels = get_n_levels();
  62         if(lv>0)
  63                 levels = min(levels, lv);
  64
  65         GLenum gl_fmt = get_gl_pixelformat(storage_fmt);
  66         if(ARB_texture_storage)
  67         {
  68                 if(ARB_direct_state_access)
  69                         glTextureStorage2D(id, levels, gl_fmt, width, height);
  70                 else
  71                 {
  72                         bind_scratch();
  73                         glTexStorage2D(target, levels, gl_fmt, width, height);
  74                 }
  75         }
  76         else
  77         {
  78                 bind_scratch();
  79                 glTexParameteri(target, GL_TEXTURE_MAX_LEVEL, levels-1);
  80                 GLenum comp = get_gl_components(get_components(storage_fmt));
  81                 GLenum type = get_gl_type(get_component_type(storage_fmt));
  82                 for(unsigned i=0; i<levels; ++i)
  83                 {
  84                         LinAl::Vector<unsigned, 2> lv_size = get_level_size(i);
  85                         glTexImage2D(target, i, gl_fmt, lv_size.x, lv_size.y, 0, comp, type, 0);
  86                 }
  87         }
  88
  89         apply_swizzle();
  90 }
  91
  92 void Texture2D::image(unsigned level, const void *data)
  93 {
  94         LinAl::Vector<unsigned, 2> size = get_level_size(level);
  95         return sub_image(level, 0, 0, size.x, size.y, data);
  96 }
  97
  98 void Texture2D::sub_image(unsigned level, int x, int y, unsigned wd, unsigned ht, const void *data)
  99 {
 100         if(width==0 || height==0)
 101                 throw invalid_operation("Texture2D::sub_image");
 102         if(level>=levels)
 103                 throw out_of_range("Texture2D::sub_image");
 104
 105         GLenum comp = get_gl_components(get_components(storage_fmt));
 106         GLenum type = get_gl_type(get_component_type(storage_fmt));
 107         if(ARB_direct_state_access)
 108                 glTextureSubImage2D(id, level, x, y, wd, ht, comp, type, data);
 109         else
 110         {
 111                 bind_scratch();
 112                 glTexSubImage2D(target, level, x, y, wd, ht, comp, type, data);
 113         }
 114 }
 115
 116 void Texture2D::image(const Graphics::Image &img, unsigned lv)
 117 {
 118         image(img, lv, false);
 119 }
 120
 121 void Texture2D::image(const Graphics::Image &img, unsigned lv, bool from_buffer)
 122 {
 123         unsigned w = img.get_width();
 124         unsigned h = img.get_height();
 125         PixelFormat fmt = pixelformat_from_image(img);
 126         storage(make_pixelformat(get_components(fmt), get_component_type(fmt), use_srgb_format), w, h, lv);
 127
 128         image(0, from_buffer ? 0 : img.get_pixels());
 129 }
 130
 131 unsigned Texture2D::get_n_levels() const
 132 {
 133         unsigned n = 0;
 134         for(unsigned s=max(width, height); s; s>>=1, ++n) ;
 135         return n;
 136 }
 137
 138 LinAl::Vector<unsigned, 2> Texture2D::get_level_size(unsigned level) const
 139 {
 140         unsigned w = width>>level;
 141         unsigned h = height>>level;
 142
 143         if(!w && h)
 144                 w = 1;
 145         else if(!h && w)
 146                 h = 1;
 147
 148         return LinAl::Vector<unsigned, 2>(w, h);
 149 }
 150
 151 Resource::AsyncLoader *Texture2D::load(IO::Seekable &io, const Resources *)
 152 {
 153         AsyncLoader *ldr = new AsyncLoader(*this, io);
 154         return ldr;
 155 }
 156
 157 uint64_t Texture2D::get_data_size() const
 158 {
 159         return id ? width*height*get_pixel_size(format) : 0;
 160 }
 161
 162 void Texture2D::unload()
 163 {
 164         glDeleteTextures(1, &id);
 165         id = 0;
 166 }
 167
 168
 169 Texture2D::Loader::Loader(Texture2D &t):
 170         DataFile::DerivedObjectLoader<Texture2D, Texture::Loader>(t)
 171 {
 172         init();
 173 }
 174
 175 Texture2D::Loader::Loader(Texture2D &t, Collection &c):
 176         DataFile::DerivedObjectLoader<Texture2D, Texture::Loader>(t, c)
 177 {
 178         init();
 179 }
 180
 181 void Texture2D::Loader::init()
 182 {
 183         add("raw_data", &Loader::raw_data);
 184         add("storage", &Loader::storage);
 185         add("storage", &Loader::storage_levels);
 186 }
 187
 188 void Texture2D::Loader::raw_data(const string &data)
 189 {
 190         if(obj.manager)
 191         {
 192                 obj.set_manager(0);
 193                 if(!obj.id)
 194                         obj.generate_id();
 195         }
 196         obj.image(0, data.data());
 197 }
 198
 199 void Texture2D::Loader::storage(PixelFormat fmt, unsigned w, unsigned h)
 200 {
 201         obj.storage(fmt, w, h);
 202 }
 203
 204 void Texture2D::Loader::storage_levels(PixelFormat fmt, unsigned w, unsigned h, unsigned l)
 205 {
 206         obj.storage(fmt, w, h, l);
 207 }
 208
 209
 210 Texture2D::AsyncLoader::AsyncLoader(Texture2D &t, IO::Seekable &i):
 211         texture(t),
 212         io(i),
 213         mapped_address(0),
 214         img_loader(Graphics::ImageLoader::open_io(io)),
 215         phase(0)
 216 { }
 217
 218 Texture2D::AsyncLoader::~AsyncLoader()
 219 {
 220         if(mapped_address)
 221                 pixel_buffer.unmap();
 222         delete img_loader;
 223 }
 224
 225 bool Texture2D::AsyncLoader::needs_sync() const
 226 {
 227         return phase%2;
 228 }
 229
 230 bool Texture2D::AsyncLoader::process()
 231 {
 232         if(phase==0)
 233         {
 234                 image.load_headers(*img_loader);
 235                 n_bytes = image.get_stride()*image.get_height();
 236         }
 237         else if(phase==1)
 238         {
 239                 pixel_buffer.storage(n_bytes);
 240                 mapped_address = reinterpret_cast<char *>(pixel_buffer.map());
 241         }
 242         else if(phase==2)
 243                 image.load_into(*img_loader, mapped_address);
 244         else if(phase==3)
 245         {
 246                 mapped_address = 0;
 247                 if(!pixel_buffer.unmap())
 248                 {
 249                         phase = 1;
 250                         return false;
 251                 }
 252
 253                 if(!texture.id)
 254                         texture.generate_id();
 255                 glBindBuffer(GL_PIXEL_UNPACK_BUFFER, pixel_buffer.get_id());
 256                 texture.image(image, 0, true);
 257                 glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
 258                 if(texture.auto_gen_mipmap)
 259                         texture.generate_mipmap();
 260         }
 261
 262         ++phase;
 263         return phase>3;
 264 }
 265
 266 } // namespace GL
 267 } // namespace Msp