source/backends/opengl/texture2d_backend.cpp

   1 #include <msp/datafile/rawdata.h>
   2 #include <msp/gl/extensions/arb_direct_state_access.h>
   3 #include <msp/gl/extensions/arb_texture_storage.h>
   4 #include <msp/gl/extensions/arb_vertex_buffer_object.h>
   5 #include <msp/graphics/imageloader.h>
   6 #include "buffer.h"
   7 #include "gl.h"
   8 #include "texture2d.h"
   9 #include "texture2d_backend.h"
  10
  11 using namespace std;
  12
  13 namespace Msp {
  14 namespace GL {
  15
  16 class OpenGLTexture2D::AsyncLoader: public Resource::AsyncLoader
  17 {
  18 private:
  19         Texture2D &texture;
  20         IO::Seekable &io;
  21         Buffer pixel_buffer;
  22         char *mapped_address = 0;
  23         Graphics::Image image;
  24         Graphics::ImageLoader *img_loader = 0;
  25         DataFile::RawData *raw_data = 0;
  26         unsigned n_bytes = 0;
  27         int phase = 0;
  28
  29 public:
  30         AsyncLoader(Texture2D &, IO::Seekable &);
  31         ~AsyncLoader();
  32
  33         virtual bool needs_sync() const;
  34         virtual bool process();
  35 };
  36
  37
  38 OpenGLTexture2D::OpenGLTexture2D():
  39         Texture(GL_TEXTURE_2D)
  40 { }
  41
  42 void OpenGLTexture2D::allocate()
  43 {
  44         const Texture2D &self = *static_cast<const Texture2D *>(this);
  45
  46         if(!id)
  47                 create();
  48
  49         GLenum gl_fmt = get_gl_pixelformat(storage_fmt);
  50         if(ARB_texture_storage)
  51         {
  52                 if(ARB_direct_state_access)
  53                         glTextureStorage2D(id, self.levels, gl_fmt, self.width, self.height);
  54                 else
  55                 {
  56                         bind_scratch();
  57                         glTexStorage2D(target, self.levels, gl_fmt, self.width, self.height);
  58                 }
  59         }
  60         else
  61         {
  62                 bind_scratch();
  63                 glTexParameteri(target, GL_TEXTURE_MAX_LEVEL, self.levels-1);
  64                 GLenum comp = get_gl_components(get_components(storage_fmt));
  65                 GLenum type = get_gl_type(get_component_type(storage_fmt));
  66                 for(unsigned i=0; i<self.levels; ++i)
  67                 {
  68                         auto lv_size = self.get_level_size(i);
  69                         glTexImage2D(target, i, gl_fmt, lv_size.x, lv_size.y, 0, comp, type, 0);
  70                 }
  71         }
  72
  73         apply_swizzle();
  74 }
  75
  76 void OpenGLTexture2D::sub_image(unsigned level, int x, int y, unsigned wd, unsigned ht, const void *data)
  77 {
  78         GLenum comp = get_gl_components(get_components(storage_fmt));
  79         GLenum type = get_gl_type(get_component_type(storage_fmt));
  80         if(ARB_direct_state_access)
  81                 glTextureSubImage2D(id, level, x, y, wd, ht, comp, type, data);
  82         else
  83         {
  84                 bind_scratch();
  85                 glTexSubImage2D(target, level, x, y, wd, ht, comp, type, data);
  86         }
  87 }
  88
  89 void OpenGLTexture2D::sub_image(unsigned level, int x, int y, unsigned wd, unsigned ht, const Buffer &buffer, unsigned offset)
  90 {
  91         glBindBuffer(GL_PIXEL_UNPACK_BUFFER, buffer.id);
  92         sub_image(level, x, y, wd, ht, reinterpret_cast<void *>(offset));
  93         glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
  94 }
  95
  96 Resource::AsyncLoader *OpenGLTexture2D::load(IO::Seekable &io, const Resources *)
  97 {
  98         return new AsyncLoader(static_cast<Texture2D &>(*this), io);
  99 }
 100
 101 uint64_t OpenGLTexture2D::get_data_size() const
 102 {
 103         if(!id)
 104                 return 0;
 105
 106         const Texture2D &self = *static_cast<const Texture2D *>(this);
 107
 108         size_t level_size = self.width*self.height*get_pixel_size(format);
 109         size_t total_size = level_size;
 110         for(unsigned i=0; i<self.levels; ++i, level_size>>=2)
 111                 total_size += level_size;
 112         return total_size;
 113 }
 114
 115 void OpenGLTexture2D::unload()
 116 {
 117         glDeleteTextures(1, &id);
 118         id = 0;
 119 }
 120
 121
 122 OpenGLTexture2D::AsyncLoader::AsyncLoader(Texture2D &t, IO::Seekable &i):
 123         texture(t),
 124         io(i)
 125 {
 126         char magic[4] = { };
 127         io.read(magic, 4);
 128         io.seek(0, IO::S_BEG);
 129
 130         if(DataFile::RawData::detect_signature(string(magic, 4)))
 131         {
 132                 raw_data = new DataFile::RawData;
 133                 raw_data->open_io(io, "async");
 134         }
 135         else
 136                 img_loader = Graphics::ImageLoader::open_io(io);
 137 }
 138
 139 OpenGLTexture2D::AsyncLoader::~AsyncLoader()
 140 {
 141         if(mapped_address)
 142                 pixel_buffer.unmap();
 143         delete img_loader;
 144         delete raw_data;
 145 }
 146
 147 bool OpenGLTexture2D::AsyncLoader::needs_sync() const
 148 {
 149         return phase%2;
 150 }
 151
 152 bool OpenGLTexture2D::AsyncLoader::process()
 153 {
 154         if(phase==0)
 155         {
 156                 if(raw_data)
 157                         n_bytes = raw_data->get_size();
 158                 else
 159                 {
 160                         image.load_headers(*img_loader);
 161                         n_bytes = image.get_stride()*image.get_height();
 162                 }
 163         }
 164         else if(phase==1)
 165         {
 166                 pixel_buffer.storage(n_bytes, STREAMING);
 167                 mapped_address = reinterpret_cast<char *>(pixel_buffer.map());
 168         }
 169         else if(phase==2)
 170         {
 171                 if(raw_data)
 172                         raw_data->load_into(mapped_address);
 173                 else
 174                         image.load_into(*img_loader, mapped_address);
 175         }
 176         else if(phase==3)
 177         {
 178                 mapped_address = 0;
 179                 if(!pixel_buffer.unmap())
 180                 {
 181                         phase = 1;
 182                         return false;
 183                 }
 184
 185                 if(!texture.id)
 186                         texture.create();
 187
 188                 if(img_loader)
 189                 {
 190                         unsigned w = image.get_width();
 191                         unsigned h = image.get_height();
 192                         texture.storage(pixelformat_from_image(image, texture.use_srgb_format), w, h);
 193                 }
 194                 texture.OpenGLTexture2D::sub_image(0, 0, 0, texture.width, texture.height, pixel_buffer, 0);
 195
 196                 if(texture.auto_gen_mipmap)
 197                         texture.generate_mipmap();
 198         }
 199
 200         ++phase;
 201         return phase>3;
 202 }
 203
 204 } // namespace GL
 205 } // namespace Msp