SPECTGPU:starting point; created SPECTGPU_projector folder and schel…

src/include/stir/recon_buildblock/SPECTGPU_projector/BackProjectorByBinSPECTGPU.h

@@ -0,0 +1,103 @@
+//
+//
+/*!
+  \file
+  \ingroup projection
+  \ingroup SPECTGPU
+
+  \brief Back projection class using SPECTGPU's GPU implementation.
+
+  \author Daniel Deidda
+
+  \todo SPECTGPU limitations - 
+
+  \todo STIR wrapper limitations - 
+*/
+/*
+    Copyright (C) 2026, National Physical Laboratory
+    This file is part of STIR.
+
+    SPDX-License-Identifier: Apache-2.0
+
+    See STIR/LICENSE.txt for details
+*/
+#ifndef __stir_gpu_BackProjectorByBinSPECTGPU_h__
+#define __stir_gpu_BackProjectorByBinSPECTGPU_h__
+
+#include "stir/RegisteredParsingObject.h"
+#include "stir/recon_buildblock/BackProjectorByBin.h"
+#include "stir/recon_buildblock/SPECTGPU_projector/SPECTGPUHelper.h"
+
+START_NAMESPACE_STIR
+
+class DataSymmetriesForViewSegmentNumbers;
+
+/*!
+  \ingroup projection
+  \brief Class for SPECTGPU's GPU back projector
+*/
+class BackProjectorByBinSPECTGPU : public RegisteredParsingObject<BackProjectorByBinSPECTGPU, BackProjectorByBin>
+{
+public:
+  //! Name which will be used when parsing a BackProjectorByBin object
+  static const char* const registered_name;
+
+  //! Default constructor calls reset_timers()
+  BackProjectorByBinSPECTGPU();
+
+  virtual ~BackProjectorByBinSPECTGPU();
+
+  /// Keymap
+  virtual void initialise_keymap();
+
+  //! Stores all necessary geometric info
+  /*!
+   If necessary, set_up() can be called more than once.
+   */
+  virtual void set_up(const shared_ptr<const ProjDataInfo>& proj_data_info_ptr,
+                      const shared_ptr<const DiscretisedDensity<3, float>>& density_info_sptr // TODO should be Info only
+  );
+
+  /// Back project
+  void back_project(const ProjData&, int subset_num = 0, int num_subsets = 1);
+
+  /// Get output
+  virtual void get_output(DiscretisedDensity<3, float>&) const;
+
+  /*! \brief tell the back projector to start accumulating into a new target.
+    This function has to be called before any back-projection is initiated.*/
+  virtual void start_accumulating_in_new_target();
+
+  /// Set verbosity
+  void set_verbosity(const bool verbosity) { _cuda_verbosity = verbosity; }
+
+  /// Set use truncation - truncate before forward
+  /// projection and after back projection
+  void set_use_truncation(const bool use_truncation) { _use_truncation = use_truncation; }
+
+protected:
+  virtual void actual_back_project(const RelatedViewgrams<float>&,
+                                   const int min_axial_pos_num,
+                                   const int max_axial_pos_num,
+                                   const int min_tangential_pos_num,
+                                   const int max_tangential_pos_num);
+
+  virtual void actual_back_project(DiscretisedDensity<3, float>& stir_image,
+                                   const RelatedViewgrams<float>&,
+                                   const int min_axial_pos_num,
+                                   const int max_axial_pos_num,
+                                   const int min_tangential_pos_num,
+                                   const int max_tangential_pos_num);
+
+private:
+  shared_ptr<DataSymmetriesForViewSegmentNumbers> _symmetries_sptr;
+  SPECTGPUHelper _helper;
+  int _cuda_device;
+  bool _cuda_verbosity;
+  std::vector<float> _np_sino;
+  bool _use_truncation;
+};
+
+END_NAMESPACE_STIR
+
+#endif // __stir_gpu_BackProjectorByBinSPECTGPU_h__

src/include/stir/recon_buildblock/SPECTGPU_projector/ForwardProjectorByBinSPECTGPU.h

@@ -0,0 +1,119 @@
+//
+//
+
+#ifndef __stir_gpu_ForwardProjectorByBinSPECTGPU_h__
+#define __stir_gpu_ForwardProjectorByBinSPECTGPU_h__
+/*!
+  \file
+  \ingroup projection
+  \ingroup SPECTGPU
+
+  \brief Forward projection class using SPECTGPU's GPU implementation.
+
+  \author Daniel Deidda
+
+  \todo SPECTGPU limitations - 
+
+  \todo STIR wrapper limitations - 
+
+*/
+/*
+    Copyright (C) 2026, National Physical Laboratory
+    This file is part of STIR.
+
+    SPDX-License-Identifier: Apache-2.0
+
+    See STIR/LICENSE.txt for details
+*/
+
+#include "stir/RegisteredParsingObject.h"
+#include "stir/recon_buildblock/ForwardProjectorByBin.h"
+#include "stir/recon_buildblock/SPECTGPU_projector/SPECTGPUHelper.h"
+
+START_NAMESPACE_STIR
+
+class ProjDataInMemory;
+class DataSymmetriesForViewSegmentNumbers;
+
+/*!
+  \ingroup projection
+  \brief Class for SPECTGPU's GPU forward projector.
+*/
+class ForwardProjectorByBinSPECTGPU : public RegisteredParsingObject<ForwardProjectorByBinSPECTGPU, ForwardProjectorByBin>
+{
+public:
+  //! Name which will be used when parsing a ForwardProjectorByBin object
+  static const char* const registered_name;
+
+  //! Default constructor calls reset_timers()
+  // inline
+  ForwardProjectorByBinSPECTGPU();
+
+  /// Constructor
+  virtual ~ForwardProjectorByBinSPECTGPU();
+
+  /// Keymap
+  virtual void initialise_keymap();
+
+  //! Stores all necessary geometric info
+  /*!
+   If necessary, set_up() can be called more than once.
+
+   Derived classes can assume that forward_project()  will be called
+   with input corresponding to the arguments of the last call to set_up().
+
+   \warning there is currently no check on this.
+   \warning Derived classes have to call set_up from the base class.
+   */
+  virtual void set_up(const shared_ptr<const ProjDataInfo>& proj_data_info_ptr,
+                      const shared_ptr<const DiscretisedDensity<3, float>>& density_info_sptr // TODO should be Info only
+  );
+
+  /// Set input
+  virtual void set_input(const DiscretisedDensity<3, float>&);
+
+  /// Set verbosity
+  void set_verbosity(const bool verbosity) { _cuda_verbosity = verbosity; }
+
+  /// Set use truncation - truncate before forward
+  /// projection and after back projection
+  void set_use_truncation(const bool use_truncation) { _use_truncation = use_truncation; }
+
+protected:
+  //! This virtual function has to be implemented by the derived class.
+  virtual void actual_forward_project(RelatedViewgrams<float>&,
+                                      const DiscretisedDensity<3, float>&,
+                                      const int min_axial_pos_num,
+                                      const int max_axial_pos_num,
+                                      const int min_tangential_pos_num,
+                                      const int max_tangential_pos_num);
+
+  virtual void actual_forward_project(RelatedViewgrams<float>& viewgrams,
+                                      const int min_axial_pos_num,
+                                      const int max_axial_pos_num,
+                                      const int min_tangential_pos_num,
+                                      const int max_tangential_pos_num);
+
+protected:
+  struct cppdim3
+  {
+    int x;
+    int y;
+    int z;
+  };
+
+  int z_dim, y_dim, x_dim;
+  cppdim3 block_dim;
+  cppdim3 grid_dim;
+
+private:
+  shared_ptr<ProjDataInMemory> _projected_data_sptr;
+  SPECTGPUHelper _helper;
+  int _cuda_device;
+  bool _cuda_verbosity;
+  bool _use_truncation;
+};
+
+END_NAMESPACE_STIR
+
+#endif // __stir_gpu_ForwardProjectorByBinSPECTGPU_h__

src/include/stir/recon_buildblock/SPECTGPU_projector/ProjectorByBinPairUsingSPECTGPU.h

@@ -0,0 +1,64 @@
+//
+//
+/*
+    Copyright (C) 2026, National Physical Laboratory
+    This file is part of STIR.
+
+    SPDX-License-Identifier: Apache-2.0
+
+    See STIR/LICENSE.txt for details
+*/
+/*!
+  \file
+  \ingroup projection
+  \ingroup SPECTGPU
+
+  \brief Declares class stir::ProjectorByBinPairUsingSPECTGPU
+
+  \author Daniel Deidda
+
+*/
+#ifndef __stir_recon_buildblock_ProjectorByBinPairUsingSPECTGPU_h_
+#define __stir_recon_buildblock_ProjectorByBinPairUsingSPECTGPU_h_
+
+#include "stir/RegisteredParsingObject.h"
+#include "stir/recon_buildblock/ProjectorByBinPair.h"
+
+START_NAMESPACE_STIR
+
+class Succeeded;
+/*!
+  \ingroup projection
+  \brief A projector pair based on SPECTGPU projectors
+*/
+class ProjectorByBinPairUsingSPECTGPU
+    : public RegisteredParsingObject<ProjectorByBinPairUsingSPECTGPU, ProjectorByBinPair, ProjectorByBinPair>
+{
+private:
+  typedef RegisteredParsingObject<ProjectorByBinPairUsingSPECTGPU, ProjectorByBinPair, ProjectorByBinPair> base_type;
+
+public:
+  //! Name which will be used when parsing a ProjectorByBinPair object
+  static const char* const registered_name;
+
+  //! Default constructor
+  ProjectorByBinPairUsingSPECTGPU();
+
+  /// Set verbosity
+  void set_verbosity(const bool verbosity);
+
+  /// Set use truncation - truncate before forward
+  /// projection and after back projection
+  void set_use_truncation(const bool use_truncation);
+
+private:
+  void set_defaults();
+  void initialise_keymap();
+  bool post_processing();
+  bool _verbosity;
+  bool _use_truncation;
+};
+
+END_NAMESPACE_STIR
+
+#endif // __stir_recon_buildblock_ProjectorByBinPairUsingSPECTGPU_h_