Add OffscreenView class

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

diff --git a/source/bufferable.cpp b/source/bufferable.cpp
index 60df3eec92c1bd188dbab825e998baf1dd97e7b4..3178e0adefa38f72e2d8aa22ecbae6769c50cdc7 100644 (file)
--- a/source/bufferable.cpp
+++ b/source/bufferable.cpp
@@ -1,4 +1,7 @@
 #include <stdexcept>
+#include <msp/core/raii.h>
+#include <msp/gl/extensions/arb_direct_state_access.h>
+#include "bindable.h"
 #include "buffer.h"
 #include "bufferable.h"
 
@@ -39,9 +42,15 @@ void Bufferable::use_buffer(Buffer *buf, Bufferable *prev)
                }
        }
 
+       dirty = true;
        update_offset();
 }
 
+Bufferable::AsyncUpdater *Bufferable::refresh_async() const
+{
+       return dirty ? new AsyncUpdater(*this) : 0;
+}
+
 void Bufferable::unlink_from_buffer()
 {
        if(prev_in_buffer)
@@ -79,7 +88,7 @@ void Bufferable::update_offset()
        the buffer is actually used. */
 }
 
-void Bufferable::update_buffer() const
+bool Bufferable::resize_buffer() const
 {
        if(offset+get_data_size()>=buffer->get_size())
        {
@@ -91,17 +100,74 @@ void Bufferable::update_buffer() const
                if(total_size>buffer->get_size())
                {
                        buffer->data(total_size, 0);
-                       /* Resizing the buffer invalidates its contents.  Non-dirty data may
-                       be in use, so reupload it. */
-                       for(const Bufferable *b=last; b; b=b->prev_in_buffer)
-                               if(!b->dirty)
-                                       b->upload_data();
+                       return true;
                }
        }
 
-       upload_data();
+       return false;
+}
+
+void Bufferable::update_buffer() const
+{
+       Conditional<BindRestore> _bind(!ARB_direct_state_access, buffer, buffer->get_type());
+
+       if(resize_buffer())
+       {
+               /* Resizing the buffer invalidates its contents.  Non-dirty data may
+               be in use, so reupload it. */
+               for(const Bufferable *b=prev_in_buffer; b; b=b->prev_in_buffer)
+                       if(!b->dirty)
+                               b->upload_data(0);
+               for(const Bufferable *b=next_in_buffer; b; b=b->next_in_buffer)
+                       if(!b->dirty)
+                               b->upload_data(0);
+       }
+
+       upload_data(0);
        dirty = false;
 }
 
+void Bufferable::upload_data(char *target) const
+{
+       if(target)
+       {
+               const char *source = reinterpret_cast<const char *>(get_data_pointer());
+               copy(source, source+get_data_size(), target);
+       }
+       else
+               buffer->sub_data(offset, get_data_size(), get_data_pointer());
+}
+
+
+Bufferable::AsyncUpdater::AsyncUpdater(const Bufferable &b):
+       bufferable(b)
+{
+       buffer_resized = bufferable.resize_buffer();
+       mapped_address = reinterpret_cast<char *>(bufferable.buffer->map(WRITE_ONLY));
+}
+
+Bufferable::AsyncUpdater::~AsyncUpdater()
+{
+       bufferable.buffer->unmap();
+}
+
+void Bufferable::AsyncUpdater::upload_data()
+{
+       bufferable.upload_data(mapped_address+bufferable.offset);
+       // Update all bufferables in the same buffer at once
+       for(const Bufferable *b=bufferable.prev_in_buffer; b; b=b->prev_in_buffer)
+               if(b->dirty || buffer_resized)
+               {
+                       b->upload_data(mapped_address+b->offset);
+                       b->dirty = false;
+               }
+       for(const Bufferable *b=bufferable.next_in_buffer; b; b=b->next_in_buffer)
+               if(b->dirty || buffer_resized)
+               {
+                       b->upload_data(mapped_address+b->offset);
+                       b->dirty = false;
+               }
+}
+
 } // namespace GL
 } // namespace Msp