// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#ifndef TESSERACT_OPENCL_OPENCLWRAPPER_H_
#define TESSERACT_OPENCL_OPENCLWRAPPER_H_

#include <cstdio>
#include "allheaders.h"
#include "pix.h"
#include "tprintf.h"

// including CL/cl.h doesn't occur until USE_OPENCL defined below

/**************************************************************************
 * enable/disable use of OpenCL
 **************************************************************************/

#ifdef USE_OPENCL

#ifdef __APPLE__
#include <OpenCL/cl.h>
#else
#include <CL/cl.h>
#endif

struct TessDeviceScore;

// device type
enum ds_device_type {
  DS_DEVICE_NATIVE_CPU = 0,
  DS_DEVICE_OPENCL_DEVICE
};

struct ds_device {
  ds_device_type type;
  cl_device_id oclDeviceID;
  char* oclDeviceName;
  char* oclDriverVersion;
  // a pointer to the score data, the content/format is application defined.
  TessDeviceScore* score;
};

#ifndef strcasecmp
#define strcasecmp strcmp
#endif

#define MAX_KERNEL_STRING_LEN 64
#define MAX_CLFILE_NUM 50
#define MAX_CLKERNEL_NUM 200
#define MAX_KERNEL_NAME_LEN 64
#define CL_QUEUE_THREAD_HANDLE_AMD 0x403E
#define GROUPSIZE_X 16
#define GROUPSIZE_Y 16
#define GROUPSIZE_HMORX 256
#define GROUPSIZE_HMORY 1

struct KernelEnv {
  cl_context mpkContext;
  cl_command_queue mpkCmdQueue;
  cl_program mpkProgram;
  cl_kernel mpkKernel;
  char mckKernelName[150];
};

struct OpenCLEnv {
  cl_platform_id mpOclPlatformID;
  cl_context mpOclContext;
  cl_device_id mpOclDevsID;
  cl_command_queue mpOclCmdQueue;
};
typedef int (*cl_kernel_function)(void** userdata, KernelEnv* kenv);

#define CHECK_OPENCL(status, name)                                    \
  if (status != CL_SUCCESS) {                                         \
    tprintf("OpenCL error code is %d at   when %s .\n", status, name); \
  }

struct GPUEnv {
  // share vb in all modules in hb library
  cl_platform_id mpPlatformID;
  cl_device_type mDevType;
  cl_context mpContext;
  cl_device_id* mpArryDevsID;
  cl_device_id mpDevID;
  cl_command_queue mpCmdQueue;
  cl_kernel mpArryKernels[MAX_CLFILE_NUM];
  cl_program mpArryPrograms[MAX_CLFILE_NUM];  // one program object maps one
                                              // kernel source file
  char mArryKnelSrcFile[MAX_CLFILE_NUM]
                       [256],  // the max len of kernel file name is 256
      mArrykernelNames[MAX_CLKERNEL_NUM][MAX_KERNEL_STRING_LEN + 1];
  cl_kernel_function mpArryKnelFuncs[MAX_CLKERNEL_NUM];
  int mnKernelCount, mnFileCount,  // only one kernel file
      mnIsUserCreated;  // 1: created , 0:no create and needed to create by
                        // opencl wrapper
  int mnKhrFp64Flag;
  int mnAmdFp64Flag;
};

class OpenclDevice {
 public:
  static GPUEnv gpuEnv;
  static int isInited;
  OpenclDevice();
  ~OpenclDevice();
  static int InitEnv();  // load dll, call InitOpenclRunEnv(0)
  static int InitOpenclRunEnv(
      int argc);  // RegistOpenclKernel, double flags, compile kernels
  static int InitOpenclRunEnv_DeviceSelection(
      int argc);  // RegistOpenclKernel, double flags, compile kernels
  static int RegistOpenclKernel();
  static int ReleaseOpenclRunEnv();
  static int ReleaseOpenclEnv(GPUEnv* gpuInfo);
  static int CompileKernelFile(GPUEnv* gpuInfo, const char* buildOption);
  static int CachedOfKernerPrg(const GPUEnv* gpuEnvCached,
                               const char* clFileName);
  static int GeneratBinFromKernelSource(cl_program program,
                                        const char* clFileName);
  static int WriteBinaryToFile(const char* fileName, const char* birary,
                               size_t numBytes);
  static int BinaryGenerated(const char* clFileName, FILE** fhandle);
  // static int CompileKernelFile( const char *filename, GPUEnv *gpuInfo, const
  // char *buildOption );
  static l_uint32* pixReadFromTiffKernel(l_uint32* tiffdata, l_int32 w,
                                         l_int32 h, l_int32 wpl,
                                         l_uint32* line);
  static int composeRGBPixelCl(int* tiffdata, int* line, int h, int w);

  /* OpenCL implementations of Morphological operations*/

  // Initialization of OCL buffers used in Morph operations
  static int initMorphCLAllocations(l_int32 wpl, l_int32 h, Pix* pixs);
  static void releaseMorphCLBuffers();

  static void pixGetLinesCL(Pix* pixd, Pix* pixs, Pix** pix_vline,
                            Pix** pix_hline, Pix** pixClosed, bool getpixClosed,
                            l_int32 close_hsize, l_int32 close_vsize,
                            l_int32 open_hsize, l_int32 open_vsize,
                            l_int32 line_hsize, l_int32 line_vsize);

  // int InitOpenclAttr( OpenCLEnv * env );
  // int ReleaseKernel( KernelEnv * env );
  static int SetKernelEnv(KernelEnv* envInfo);
  // int CreateKernel( char * kernelname, KernelEnv * env );
  // int RunKernel( const char *kernelName, void **userdata );
  // int ConvertToString( const char *filename, char **source );
  // int CheckKernelName( KernelEnv *envInfo, const char *kernelName );
  // int RegisterKernelWrapper( const char *kernelName, cl_kernel_function
  // function ); int RunKernelWrapper( cl_kernel_function function, const char *
  // kernelName, void **usrdata ); int GetKernelEnvAndFunc( const char
  // *kernelName, KernelEnv *env, cl_kernel_function *function );

  static int LoadOpencl();
#ifdef WIN32
  // static int OpenclInite();
  static void FreeOpenclDll();
#endif

  inline static int AddKernelConfig(int kCount, const char* kName);

  /* for binarization */
  static int HistogramRectOCL(void* imagedata, int bytes_per_pixel,
                              int bytes_per_line, int left, int top, int width,
                              int height, int kHistogramSize,
                              int* histogramAllChannels);

  static int ThresholdRectToPixOCL(unsigned char* imagedata,
                                   int bytes_per_pixel, int bytes_per_line,
                                   int* thresholds, int* hi_values, Pix** pix,
                                   int rect_height, int rect_width,
                                   int rect_top, int rect_left);

  static ds_device getDeviceSelection();
  static ds_device selectedDevice;
  static bool deviceIsSelected;
  static bool selectedDeviceIsOpenCL();
};

#endif  // USE_OPENCL
#endif  // TESSERACT_OPENCL_OPENCLWRAPPER_H_