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/*
-----------------------------------------------------------------------
Copyright: 2010-2021, imec Vision Lab, University of Antwerp
2014-2021, CWI, Amsterdam
Contact: astra@astra-toolbox.com
Website: http://www.astra-toolbox.com/
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/>.
-----------------------------------------------------------------------
*/
#include "astra/cuda/2d/cgls.h"
#include "astra/cuda/2d/util.h"
#include "astra/cuda/2d/arith.h"
#include <cstdio>
#include <cassert>
namespace astraCUDA {
CGLS::CGLS() : ReconAlgo()
{
D_z = 0;
D_p = 0;
D_r = 0;
D_w = 0;
sliceInitialized = false;
}
CGLS::~CGLS()
{
reset();
}
void CGLS::reset()
{
cudaFree(D_z);
cudaFree(D_p);
cudaFree(D_r);
cudaFree(D_w);
D_z = 0;
D_p = 0;
D_r = 0;
D_w = 0;
ReconAlgo::reset();
}
bool CGLS::init()
{
// Lifetime of z: within an iteration
allocateVolumeData(D_z, zPitch, dims);
// Lifetime of p: full algorithm
allocateVolumeData(D_p, pPitch, dims);
// Lifetime of r: full algorithm
allocateProjectionData(D_r, rPitch, dims);
// Lifetime of w: within an iteration
allocateProjectionData(D_w, wPitch, dims);
// TODO: check if allocations succeeded
return true;
}
bool CGLS::setBuffers(float* _D_volumeData, unsigned int _volumePitch,
float* _D_projData, unsigned int _projPitch)
{
bool ok = ReconAlgo::setBuffers(_D_volumeData, _volumePitch,
_D_projData, _projPitch);
if (!ok)
return false;
sliceInitialized = false;
return true;
}
bool CGLS::copyDataToGPU(const float* pfSinogram, unsigned int iSinogramPitch,
const float* pfReconstruction, unsigned int iReconstructionPitch,
const float* pfVolMask, unsigned int iVolMaskPitch,
const float* pfSinoMask, unsigned int iSinoMaskPitch)
{
sliceInitialized = false;
return ReconAlgo::copyDataToGPU(pfSinogram, iSinogramPitch, pfReconstruction, iReconstructionPitch, pfVolMask, iVolMaskPitch, pfSinoMask, iSinoMaskPitch);
}
bool CGLS::iterate(unsigned int iterations)
{
if (!sliceInitialized) {
// copy sinogram
duplicateProjectionData(D_r, D_sinoData, sinoPitch, dims);
// r = sino - A*x
if (useVolumeMask) {
// Use z as temporary storage here since it is unused
duplicateVolumeData(D_z, D_volumeData, volumePitch, dims);
processVol<opMul>(D_z, D_maskData, zPitch, dims);
callFP(D_z, zPitch, D_r, rPitch, -1.0f);
} else {
callFP(D_volumeData, volumePitch, D_r, rPitch, -1.0f);
}
// p = A'*r
zeroVolumeData(D_p, pPitch, dims);
callBP(D_p, pPitch, D_r, rPitch, 1.0f);
if (useVolumeMask)
processVol<opMul>(D_p, D_maskData, pPitch, dims);
gamma = dotProduct2D(D_p, pPitch, dims.iVolWidth, dims.iVolHeight);
sliceInitialized = true;
}
// iteration
for (unsigned int iter = 0; iter < iterations && !astra::shouldAbort(); ++iter) {
// w = A*p
zeroProjectionData(D_w, wPitch, dims);
callFP(D_p, pPitch, D_w, wPitch, 1.0f);
// alpha = gamma / <w,w>
float ww = dotProduct2D(D_w, wPitch, dims.iProjDets, dims.iProjAngles);
float alpha = gamma / ww;
// x += alpha*p
processVol<opAddScaled>(D_volumeData, D_p, alpha, volumePitch, dims);
// r -= alpha*w
processSino<opAddScaled>(D_r, D_w, -alpha, rPitch, dims);
// z = A'*r
zeroVolumeData(D_z, zPitch, dims);
callBP(D_z, zPitch, D_r, rPitch, 1.0f);
if (useVolumeMask)
processVol<opMul>(D_z, D_maskData, zPitch, dims);
float beta = 1.0f / gamma;
gamma = dotProduct2D(D_z, zPitch, dims.iVolWidth, dims.iVolHeight);
beta *= gamma;
// p = z + beta*p
processVol<opScaleAndAdd>(D_p, D_z, beta, pPitch, dims);
}
return true;
}
float CGLS::computeDiffNorm()
{
// We can use w and z as temporary storage here since they're not
// used outside of iterations.
// copy sinogram to w
duplicateProjectionData(D_w, D_sinoData, sinoPitch, dims);
// do FP, subtracting projection from sinogram
if (useVolumeMask) {
duplicateVolumeData(D_z, D_volumeData, volumePitch, dims);
processVol<opMul>(D_z, D_maskData, zPitch, dims);
callFP(D_z, zPitch, D_w, wPitch, -1.0f);
} else {
callFP(D_volumeData, volumePitch, D_w, wPitch, -1.0f);
}
// compute norm of D_w
float s = dotProduct2D(D_w, wPitch, dims.iProjDets, dims.iProjAngles);
return sqrt(s);
}
}
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