#pragma once
//##########################################################################
//#                                                                        #
//#                               CCFBO                                    #
//#                                                                        #
//#  This program is free software; you can redistribute it and/or modify  #
//#  it under the terms of the GNU Library General Public License as       #
//#  published by the Free Software Foundation; version 2 or later of the License.  #
//#                                                                        #
//#  This program is distributed in the hope that it will be useful,       #
//#  but WITHOUT ANY WARRANTY; without even the implied warranty of        #
//#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the          #
//#  GNU General Public License for more details.                          #
//#                                                                        #
//#          COPYRIGHT: EDF R&D / TELECOM ParisTech (ENST-TSI)             #
//#                                                                        #
//##########################################################################

#include "CCFbo.h"

//Qt
#include <QOpenGLExtensions>
#include <QOpenGLFunctions_2_1>

//! F.B.O. encapsulation
/** Compared to the QOpenGLFramebufferObject class, this one offers the possibility to:
	- get the attached depth texture ID
	- attach a custom COLOR texture
**/
class CCFBO_LIB_API ccFrameBufferObject
{
public:
	ccFrameBufferObject();
	~ccFrameBufferObject();

	bool init(unsigned w, unsigned h);
	void reset();
	bool start();
	void stop();

	inline bool isValid() const { return m_fboId; }

	bool initColor(	GLint internalformat = GL_RGBA,
					GLenum format = GL_RGBA,
					GLenum type = GL_UNSIGNED_BYTE,
					GLint minMagFilter = GL_NEAREST,
					GLenum target = GL_TEXTURE_2D);

	bool attachColor(	GLuint texID,
						bool ownTexture = false,
						GLenum target = GL_TEXTURE_2D);

	bool initDepth(	GLint wrapParam = GL_CLAMP_TO_BORDER,
					GLenum internalFormat = GL_DEPTH_COMPONENT32F,
					GLint minMagFilter = GL_NEAREST,
					GLenum textureTarget = GL_TEXTURE_2D);

	bool attachDepth(	GLuint texID,
						bool ownTexture = false,
						GLenum target = GL_TEXTURE_2D);

	inline GLuint getID() const { return m_fboId;  }
	inline GLuint getColorTexture() const { return m_colorTexture; }
	inline GLuint getDepthTexture() const { return m_depthTexture; }

	//! Returns width
	inline unsigned width() const { return m_width; }
	//! Returns height
	inline unsigned height() const { return m_height; }

protected: //methods

	//! Deletes/releases the color texture
	void deleteColorTexture();

	//! Deletes/releases the depth texture
	void deleteDepthTexture();

protected: //members

	//! FBO validity
	bool m_isValid;

	//! Width
	unsigned m_width;
	//! Height
	unsigned m_height;

	//! Depth texture GL ID
	GLuint m_depthTexture;

	//! Whether the depth texture is owned by this FBO or not
	bool m_ownDepthTexture;

	//! Color texture GL ID
	GLuint m_colorTexture;

	//! Whether the color texture is owned by this FBO or not
	bool m_ownColorTexture;

	//! ID
	GLuint m_fboId;

	// For portability, we need to use 2.1 + extensions to get FBOs
	QOpenGLFunctions_2_1 m_glFunc;
	QOpenGLExtension_ARB_framebuffer_object	m_glExtFunc;
};