X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Fcore%2Fbuffer.h;h=b642738e0e96ef370a5e748701be071998e2de54;hb=6cee6c490ded0981c4da3f9f4ec74a41555e1a4e;hp=2366ec5ce0dd3269ee13db7d80bd53eade0fd565;hpb=f2bb1caa233930e1148613e9d5daa2c29b0fe271;p=libs%2Fgl.git

diff --git a/source/core/buffer.h b/source/core/buffer.h
index 2366ec5c..b642738e 100644
--- a/source/core/buffer.h
+++ b/source/core/buffer.h
@@ -16,34 +16,38 @@ public:
 };
 
 /**
-A buffer for storing data in GL memory.  Putting vertex and index data in
-buffers can improve rendering performance.  The VertexArray, Mesh and
-UniformBlock classes contain built-in support for buffers.
+Stores data in GPU memory.
+
+Memory must be allocated for the buffer by calling storage().  Contents can
+then be modified either synchronously with the data() and sub_data() functions,
+or asynchronously by memory-mapping the buffer.
+
+Applications normally don't need to deal with Buffers directly.  They're
+managed by other classes such as Mesh and ProgramData.
 */
 class Buffer: public BufferBackend
 {
 	friend BufferBackend;
 
 private:
-	unsigned size = 0;
+	std::size_t size = 0;
 
 public:
-	/** Defines the storage size of the buffer.  Must be called before data can
-	be uploaded.  Storage cannot be changed once set. */
-	void storage(unsigned);
+	/** Sets the storage size and allocates memory for the buffer.  Size cannot
+	be changed once set. */
+	void storage(std::size_t);
 
-	/** Uploads data into the buffer, completely replacing any previous
-	contents.  Storage must be defined beforehand.  The data must have size
-	matching the defined storage. */
+	/** Replaces contents of the entire buffer.  Allocated storage must exist.
+	The data must have size matching the defined storage. */
 	void data(const void *);
 
-	/** Overwrites part of the buffer data with new data.  Storage must be
-	defined beforehand. */
-	void sub_data(unsigned, unsigned, const void *);
+	/** Replaces a range of bytes in the buffer.  Allocated storage must exist.
+	The range must be fully inside the buffer. */
+	void sub_data(std::size_t, std::size_t, const void *);
 
-	unsigned get_size() const { return size; }
+	std::size_t get_size() const { return size; }
 
-	void require_size(unsigned) const;
+	void require_size(std::size_t) const;
 
 	using BufferBackend::map;
 	using BufferBackend::unmap;