/***********************************************************************************************************************
*                                                                                                                      *
* glscopeclient                                                                                                        *
*                                                                                                                      *
* Copyright (c) 2012-2020 Andrew D. Zonenberg                                                                          *
* All rights reserved.                                                                                                 *
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*      following disclaimer.                                                                                           *
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*      derived from this software without specific prior written permission.                                           *
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* POSSIBILITY OF SUCH DAMAGE.                                                                                          *
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/**
	@file
	@author Andrew D. Zonenberg
	@brief  Declaration of VertexBuffer
 */
#ifndef VertexBuffer_h
#define VertexBuffer_h

/**
	@brief An OpenGL VBO.

	No virtual functions allowed, must be a POD type.
 */
class VertexBuffer
{
public:
	VertexBuffer()
	: m_handle(0)
	{}

	~VertexBuffer()
	{ Destroy(); }

	void Destroy()
	{
		if(m_handle != 0)
			glDeleteBuffers(1, &m_handle);
		m_handle = 0;
	}

	operator GLuint() const
	{ return m_handle; }

	void Bind()
	{
		LazyInit();
		glBindBuffer(GL_ARRAY_BUFFER, m_handle);
	}

	static void BulkInit(std::vector<VertexBuffer*>& arr);

protected:

	/**
		@brief Lazily creates the VAO
	 */
	void LazyInit()
	{
		if(!m_handle)
			glGenBuffers(1, &m_handle);
	}

	GLuint	m_handle;
};

#endif
