/***********************************************************************************************************************
*                                                                                                                      *
* glscopeclient                                                                                                        *
*                                                                                                                      *
* Copyright (c) 2012-2020 Andrew D. Zonenberg                                                                          *
* All rights reserved.                                                                                                 *
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* following conditions are met:                                                                                        *
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*    * Redistributions of source code must retain the above copyright notice, this list of conditions, and the         *
*      following disclaimer.                                                                                           *
*                                                                                                                      *
*    * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the       *
*      following disclaimer in the documentation and/or other materials provided with the distribution.                *
*                                                                                                                      *
*    * Neither the name of the author nor the names of any contributors may be used to endorse or promote products     *
*      derived from this software without specific prior written permission.                                           *
*                                                                                                                      *
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED   *
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* POSSIBILITY OF SUCH DAMAGE.                                                                                          *
*                                                                                                                      *
***********************************************************************************************************************/

/**
	@file
	@author Andrew D. Zonenberg
	@brief  Declaration of Framebuffer
 */
#ifndef Framebuffer_h
#define Framebuffer_h

#include "Texture.h"

/**
	@brief A framebuffer object
 */
class Framebuffer
{
public:
	Framebuffer();
	virtual ~Framebuffer();

	operator GLuint()
	{ return m_handle; }

	/**
		@brief Initialize this FBO from the currently bound FBO.

		This is important in GTK stuff since it creates FBOs for us,
		and the window surface may not be framebuffer 0!
	 */
	void InitializeFromCurrentFramebuffer()
	{
		if(!m_handle)
			glGetIntegerv(GL_DRAW_FRAMEBUFFER_BINDING, (GLint*)&m_handle);
	}

	void Bind(GLenum target)
	{
		LazyInit();
		glBindFramebuffer(target, m_handle);
	}

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

	void Detach()
	{ m_handle = 0; }

	bool IsInitialized()
	{ return (m_handle != 0); }

	//we must be bound for this to work
	bool IsComplete(GLenum target = GL_FRAMEBUFFER)
	{ return glCheckFramebufferStatus(target) == GL_FRAMEBUFFER_COMPLETE; }

	void SetTexture(Texture& tex, GLenum target = GL_TEXTURE_2D)
	{
		glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, target, tex, 0);
	}

protected:

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

	GLuint	m_handle;
};

#endif
