/*
-----------------------------------------------------------------------
Copyright: 2010-2015, iMinds-Vision Lab, University of Antwerp
           2014-2015, CWI, Amsterdam

Contact: astra@uantwerpen.be
Website: http://sf.net/projects/astra-toolbox

This file is part of the ASTRA Toolbox.


The ASTRA Toolbox is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

The ASTRA Toolbox 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.

You should have received a copy of the GNU General Public License
along with the ASTRA Toolbox. If not, see <http://www.gnu.org/licenses/>.

-----------------------------------------------------------------------
$Id$
*/

#ifndef _CUDA_CGLS_H
#define _CUDA_CGLS_H

#include "util.h"
#include "algo.h"

namespace astraCUDA {

class _AstraExport CGLS : public ReconAlgo {
public:
	CGLS();
	virtual ~CGLS();

	// disable some features
	virtual bool enableSinogramMask() { return false; }
	virtual bool setMinConstraint(float) { return false; }
	virtual bool setMaxConstraint(float) { return false; }

	virtual bool init();

	virtual bool setBuffers(float* D_volumeData, unsigned int volumePitch,
	                        float* D_projData, unsigned int projPitch);

	virtual bool copyDataToGPU(const float* pfSinogram, unsigned int iSinogramPitch, float fSinogramScale,
	                           const float* pfReconstruction, unsigned int iReconstructionPitch,
	                           const float* pfVolMask, unsigned int iVolMaskPitch,
	                           const float* pfSinoMask, unsigned int iSinoMaskPitch);


	virtual bool iterate(unsigned int iterations);

	virtual float computeDiffNorm();

protected:
	void reset();

	bool sliceInitialized;

 	// Buffers
	float* D_r;
	unsigned int rPitch;

	float* D_w;
	unsigned int wPitch;

	float* D_z;
	unsigned int zPitch;

	float* D_p;
	unsigned int pPitch;


	float gamma;
};


_AstraExport bool doCGLS(float* D_volumeData, unsigned int volumePitch,
            float* D_projData, unsigned int projPitch,
            const SDimensions& dims, const float* angles,
            const float* TOffsets, unsigned int iterations);

}

#endif