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         unsigned width = static_cast<const Texture2D *>(this)->width;
  45         unsigned height = static_cast<const Texture2D *>(this)->height;
  46         unsigned levels = static_cast<const Texture2D *>(this)->levels;
  47
  48         if(!id)
  49                 create();
  50
  51         GLenum gl_fmt = get_gl_pixelformat(storage_fmt);
  52         if(ARB_texture_storage)
  53         {
  54                 if(ARB_direct_state_access)
  55                         glTextureStorage2D(id, levels, gl_fmt, width, height);
  56                 else
  57                 {
  58                         bind_scratch();
  59                         glTexStorage2D(target, levels, gl_fmt, width, height);
  60                 }
  61         }
  62         else
  63         {
  64                 bind_scratch();
  65                 glTexParameteri(target, GL_TEXTURE_MAX_LEVEL, levels-1);
  66                 GLenum comp = get_gl_components(get_components(storage_fmt));
  67                 GLenum type = get_gl_type(get_component_type(storage_fmt));
  68                 for(unsigned i=0; i<levels; ++i)
  69                 {
  70                         auto lv_size = static_cast<const Texture2D *>(this)->get_level_size(i);
  71                         glTexImage2D(target, i, gl_fmt, lv_size.x, lv_size.y, 0, comp, type, 0);
  72                 }
  73         }
  74
  75         apply_swizzle();
  76 }
  77
  78 void OpenGLTexture2D::sub_image(unsigned level, int x, int y, unsigned wd, unsigned ht, const void *data)
  79 {
  80         GLenum comp = get_gl_components(get_components(storage_fmt));
  81         GLenum type = get_gl_type(get_component_type(storage_fmt));
  82         if(ARB_direct_state_access)
  83                 glTextureSubImage2D(id, level, x, y, wd, ht, comp, type, data);
  84         else
  85         {
  86                 bind_scratch();
  87                 glTexSubImage2D(target, level, x, y, wd, ht, comp, type, data);
  88         }
  89 }
  90
  91 void OpenGLTexture2D::sub_image(unsigned level, int x, int y, unsigned wd, unsigned ht, const Buffer &buffer, unsigned offset)
  92 {
  93         glBindBuffer(GL_PIXEL_UNPACK_BUFFER, buffer.id);
  94         sub_image(level, x, y, wd, ht, reinterpret_cast<void *>(offset));
  95         glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
  96 }
  97
  98 Resource::AsyncLoader *OpenGLTexture2D::create_async_loader(IO::Seekable &io)
  99 {
 100         return new AsyncLoader(static_cast<Texture2D &>(*this), io);
 101 }
 102
 103 void OpenGLTexture2D::unload()
 104 {
 105         glDeleteTextures(1, &id);
 106         id = 0;
 107 }
 108
 109
 110 OpenGLTexture2D::AsyncLoader::AsyncLoader(Texture2D &t, IO::Seekable &i):
 111         texture(t),
 112         io(i)
 113 {
 114         char magic[4] = { };
 115         io.read(magic, 4);
 116         io.seek(0, IO::S_BEG);
 117
 118         if(DataFile::RawData::detect_signature(string(magic, 4)))
 119         {
 120                 raw_data = new DataFile::RawData;
 121                 raw_data->open_io(io, "async");
 122         }
 123         else
 124                 img_loader = Graphics::ImageLoader::open_io(io);
 125 }
 126
 127 OpenGLTexture2D::AsyncLoader::~AsyncLoader()
 128 {
 129         if(mapped_address)
 130                 pixel_buffer.unmap();
 131         delete img_loader;
 132         delete raw_data;
 133 }
 134
 135 bool OpenGLTexture2D::AsyncLoader::needs_sync() const
 136 {
 137         return phase%2;
 138 }
 139
 140 bool OpenGLTexture2D::AsyncLoader::process()
 141 {
 142         if(phase==0)
 143         {
 144                 if(raw_data)
 145                         n_bytes = raw_data->get_size();
 146                 else
 147                 {
 148                         image.load_headers(*img_loader);
 149                         n_bytes = image.get_stride()*image.get_height();
 150                 }
 151         }
 152         else if(phase==1)
 153         {
 154                 pixel_buffer.storage(n_bytes);
 155                 mapped_address = reinterpret_cast<char *>(pixel_buffer.map());
 156         }
 157         else if(phase==2)
 158         {
 159                 if(raw_data)
 160                         raw_data->load_into(mapped_address);
 161                 else
 162                         image.load_into(*img_loader, mapped_address);
 163         }
 164         else if(phase==3)
 165         {
 166                 mapped_address = 0;
 167                 if(!pixel_buffer.unmap())
 168                 {
 169                         phase = 1;
 170                         return false;
 171                 }
 172
 173                 if(!texture.id)
 174                         texture.create();
 175
 176                 if(img_loader)
 177                 {
 178                         unsigned w = image.get_width();
 179                         unsigned h = image.get_height();
 180                         texture.storage(pixelformat_from_image(image, texture.use_srgb_format), w, h);
 181                 }
 182                 texture.OpenGLTexture2D::sub_image(0, 0, 0, texture.width, texture.height, pixel_buffer, 0);
 183
 184                 if(texture.auto_gen_mipmap)
 185                         texture.generate_mipmap();
 186         }
 187
 188         ++phase;
 189         return phase>3;
 190 }
 191
 192 } // namespace GL
 193 } // namespace Msp