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