Enable resource management on Texture2D

[libs/gl.git] / source / texture2d.cpp

diff --git a/source/texture2d.cpp b/source/texture2d.cpp
index 96da77d1b9aba0400805461f0706c84d017ab60e..f36cadae09aaa21f6abd7f97729d16bf34f6d714 100644 (file)
--- a/source/texture2d.cpp
+++ b/source/texture2d.cpp
@@ -1,5 +1,6 @@
 #include <msp/io/memory.h>
 #include "bindable.h"
+#include "buffer.h"
 #include "error.h"
 #include "pixelstore.h"
 #include "resources.h"
@@ -10,8 +11,27 @@ using namespace std;
 namespace Msp {
 namespace GL {
 
-Texture2D::Texture2D():
-       Texture(GL_TEXTURE_2D),
+class Texture2D::AsyncLoader: public Resource::AsyncLoader
+{
+private:
+       Texture2D &texture;
+       IO::Seekable &io;
+       Buffer pixel_buffer;
+       char *mapped_address;
+       Graphics::Image image;
+       unsigned n_bytes;
+       int phase;
+
+public:
+       AsyncLoader(Texture2D &, IO::Seekable &);
+
+       virtual bool needs_sync() const;
+       virtual bool process();
+};
+
+
+Texture2D::Texture2D(ResourceManager *m):
+       Texture(GL_TEXTURE_2D, m),
        width(0),
        height(0),
        allocated(0)
@@ -78,6 +98,11 @@ void Texture2D::load_image(const string &fn, bool srgb)
 }
 
 void Texture2D::image(const Graphics::Image &img, bool srgb)
+{
+       image(img, srgb, false);
+}
+
+void Texture2D::image(const Graphics::Image &img, bool srgb, bool from_buffer)
 {
        unsigned w = img.get_width();
        unsigned h = img.get_height();
@@ -95,7 +120,7 @@ void Texture2D::image(const Graphics::Image &img, bool srgb)
        PixelStore pstore = PixelStore::from_image(img);
        BindRestore _bind_ps(pstore);
 
-       image(0, fmt, UNSIGNED_BYTE, img.get_data());
+       image(0, fmt, UNSIGNED_BYTE, from_buffer ? 0 : img.get_data());
 }
 
 void Texture2D::get_level_size(unsigned level, unsigned &w, unsigned &h)
@@ -109,6 +134,17 @@ void Texture2D::get_level_size(unsigned level, unsigned &w, unsigned &h)
                h = 1;
 }
 
+Resource::AsyncLoader *Texture2D::load(IO::Seekable &io)
+{
+       return new AsyncLoader(*this, io);
+}
+
+void Texture2D::unload()
+{
+       glDeleteTextures(1, &id);
+       id = 0;
+}
+
 
 Texture2D::Loader::Loader(Texture2D &t):
        DataFile::DerivedObjectLoader<Texture2D, Texture::Loader>(t)
@@ -156,5 +192,57 @@ void Texture2D::Loader::storage_b(PixelFormat fmt, unsigned w, unsigned h, unsig
        storage(fmt, w, h);
 }
 
+
+Texture2D::AsyncLoader::AsyncLoader(Texture2D &t, IO::Seekable &i):
+       texture(t),
+       io(i),
+       pixel_buffer(PIXEL_UNPACK_BUFFER),
+       mapped_address(0),
+       phase(0)
+{
+       if(!texture.id)
+               glGenTextures(1, &texture.id);
+}
+
+bool Texture2D::AsyncLoader::needs_sync() const
+{
+       return phase%2;
+}
+
+bool Texture2D::AsyncLoader::process()
+{
+       if(phase==0)
+       {
+               /* TODO Enhance the ImageLoader system so that the image can be loaded
+               directly to the buffer */
+               image.load_io(io);
+               n_bytes = image.get_stride()*image.get_height();
+       }
+       else if(phase==1)
+       {
+               pixel_buffer.data(n_bytes, 0);
+               mapped_address = reinterpret_cast<char *>(pixel_buffer.map(WRITE_ONLY));
+       }
+       else if(phase==2)
+       {
+               const char *data = reinterpret_cast<const char *>(image.get_data());
+               copy(data, data+n_bytes, mapped_address);
+       }
+       else if(phase==3)
+       {
+               Bind _bind_buf(pixel_buffer, PIXEL_UNPACK_BUFFER);
+               if(!pixel_buffer.unmap())
+               {
+                       phase = 1;
+                       return false;
+               }
+
+               texture.image(image, false, true);
+       }
+
+       ++phase;
+       return phase>3;
+}
+
 } // namespace GL
 } // namespace Msp