Store a Transform in keyframes instead of a Matrix

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

diff --git a/source/bufferable.h b/source/bufferable.h
index f5ae043cb5144b498cf08d389248f7a66f25eefa..a88f7b07a719535d426e262157fc8ef10879bd80 100644 (file)
--- a/source/bufferable.h
+++ b/source/bufferable.h
@@ -6,32 +6,88 @@ namespace GL {
 
 class Buffer;
 
+/**
+Base class for things that can store data in buffers.  Supports buffer sharing.
+A dirty flag is provided for derived classes.  It should be set when the data
+in the buffer is considered out of date, and is cleared by Bufferable after
+uploading fresh data to the buffer.
+*/
 class Bufferable
 {
-protected:
+public:
+       class AsyncUpdater
+       {
+       private:
+               const Bufferable &bufferable;
+               char *mapped_address;
+               bool buffer_resized;
+
+       public:
+               AsyncUpdater(const Bufferable &);
+               ~AsyncUpdater();
+
+               void upload_data();
+       };
+
+private:
        Buffer *buffer;
-       unsigned buffer_offset;
+       unsigned offset;
        Bufferable *next_in_buffer;
        Bufferable *prev_in_buffer;
+protected:
        mutable bool dirty;
 
        Bufferable();
 public:
        virtual ~Bufferable();
 
-       void use_buffer(Buffer *, Bufferable * = 0);
+       /** Sets the buffer to use.  If prev is not null, it must use the same
+       buffer, and this object is inserted after it. */
+       void use_buffer(Buffer *buf, Bufferable *prev = 0);
+
+       /** Uploads new data into the buffer if necessary. */
+       void refresh() const { if(dirty) update_buffer(); }
+
+       AsyncUpdater *refresh_async() const;
+
 private:
        void unlink_from_buffer();
 
 protected:
+       /** Returns the buffer in which the data is stored. */
+       Buffer *get_buffer() const { return buffer; }
+
+       /** Returns the amount of data to be stored in the buffer, in bytes. */
        virtual unsigned get_data_size() const = 0;
+
+       /** Returns a pointer to the start of data in client memory. */
+       virtual const void *get_data_pointer() const = 0;
+
+       /** Returns the alignment required for the data, in bytes.  The offset is
+       guaranteed to be a multiple of this. */
        virtual unsigned get_alignment() const { return 1; }
 
-       void update_buffer_offset();
+       /** Updates the offsets for the chain so that data from different objects
+       does not overlap.  Should be called if either data size or alignment
+       changes. */
+       void update_offset();
+
+       /** Returns the offset where the data should be uploaded. */
+       unsigned get_offset() const { return offset; }
+
+       /** Called when the offset for the data has changed. */
        virtual void offset_changed() { }
 
-       void update_buffer_data() const;
-       virtual void upload_data() const = 0;
+private:
+       bool resize_buffer() const;
+
+protected:
+       /** Resizes the buffer if necessary and calls upload_data(). */
+       void update_buffer() const;
+
+       /** Uploads data to the buffer.  Receives pointer to mapped buffer memory as
+       parameter.  If null, buffer interface should be used instead. */
+       virtual void upload_data(char *) const;
 };
 
 } // namespace GL