GLVertexBuffer.h
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GLVertexBuffer.h
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	#ifndef _ECHOGLVERTEXBUFFER_H_
	#define _ECHOGLVERTEXBUFFER_H_

	#include <echo/Platforms/GL/GLSupport.h>
	#include <echo/Graphics/VertexBuffer.h>

	namespace Echo
	{
	/**
	* GLVertexBuffer manages the Vertex Array Object and buffer objects for a VertexBuffer.
	* One of these is mapped to each VertexBuffer that is used by a GLRenderTarget.
	*/
	class GLVertexBuffer
	{
	public:
	GLVertexBuffer(const VertexBuffer& vertexBuffer);
	~GLVertexBuffer();

	/**
	* Check the buffer version and update if required.
	* Calling this method will cause the buffer to be bound if required.
	* The buffer will not be unbound automatically.
	*/
	void Update(const VertexBuffer& vertexBuffer);

	/**
	* Bind should be called when the buffer is going to be used.
	* @note Bind does not need to be called to update the buffer. Binding and Unbinding is managed automatically for updates.
	*/
	void Bind();

	/**
	* Unbind the buffer as the current vertex buffer
	*/
	void Unbind();

	/**
	* Get the version of the buffer.
	*/
	Size GetVersion() const
	{
	return mVersion;
	}

	/**
	* Force a version change.
	*/
	inline void IncrementVersion()
	{
	mVersion++;
	}
	private:
	Size mVersion;
	bool mIsReady;
	GLuint mVertexArrayObject;
	GLuint mVertexBuffer;
	Size mAllocatedBufferSize;
	};
	}
	#endif