X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Fcore%2Fbuffer.h;h=9b1293615832a615318cf0212400c08b3af10961;hb=e1be82a4dfce8d90358c506f65be09da4dc9d5ec;hp=8aba95b10f08176be725bbafb0aa4b5771e6e8c8;hpb=6d2e2a0bb28496a8c25b441009bdd2a1a1e72d81;p=libs%2Fgl.git diff --git a/source/core/buffer.h b/source/core/buffer.h index 8aba95b1..9b129361 100644 --- a/source/core/buffer.h +++ b/source/core/buffer.h @@ -39,6 +39,38 @@ class Buffer: public BufferBackend { friend BufferBackend; +public: + /** + An RAII handle for asynchronously writing data into a buffer. + */ + class AsyncTransfer: public NonCopyable + { + friend BufferBackend; + friend class Buffer; + + private: + Buffer *buffer = 0; + std::size_t offset = 0; + std::size_t size = 0; + void *dest_addr = 0; + + AsyncTransfer(Buffer &, std::size_t, std::size_t); + public: + AsyncTransfer() = default; + AsyncTransfer(AsyncTransfer &&); + AsyncTransfer &operator=(AsyncTransfer &&); + ~AsyncTransfer(); + + private: + void allocate(); + void finalize(); + + public: + /** Returns an address for writing the data. It should not be used + beyond the lifetime of the object. */ + void *get_address() { return dest_addr; } + }; + private: std::size_t size = 0; BufferUsage usage = STATIC; @@ -57,6 +89,15 @@ public: The range must be fully inside the buffer. */ void sub_data(std::size_t, std::size_t, const void *); + /** Creates an asynchronous transfer for writing data to a range of bytes in + the buffer. While the transfer is pending, the state of the buffer region + is indeterminate. */ + AsyncTransfer sub_data_async(std::size_t, std::size_t); + +private: + void check_sub_data(std::size_t, std::size_t, const char *); + +public: std::size_t get_size() const { return size; } using BufferBackend::get_multiplicity; std::size_t get_total_size() const { return size*get_multiplicity(); }