dlopencl.c

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/*
    This file is part of darktable,
    Copyright (C) 2011-2012 johannes hanika.
    Copyright (C) 2011 Moritz Lipp.
    Copyright (C) 2011-2014, 2016-2017 Ulrich Pegelow.
    Copyright (C) 2012 Michal Babej.
    Copyright (C) 2012 parafin.
    Copyright (C) 2012 Richard Wonka.
    Copyright (C) 2012-2014, 2016 Tobias Ellinghaus.
    Copyright (C) 2014, 2016 Roman Lebedev.
    Copyright (C) 2016-2017 Peter Budai.
    Copyright (C) 2019 Heiko Bauke.
    Copyright (C) 2020 Pascal Obry.
    Copyright (C) 2022 Hanno Schwalm.
    Copyright (C) 2022 Martin Bařinka.
    Copyright (C) 2025 Aurélien PIERRE.
    
    darktable 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.
    
    darktable 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 darktable.  If not, see <http://www.gnu.org/licenses/>.
*/
 
#ifdef HAVE_OPENCL
 
#include "common/dlopencl.h"
#include "system/dynload.h"
#include "common/logging.h"
#include "system/macros.h"
#include "system/mem_alloc.h"
 
#include <assert.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
 
#if defined(WIN32)
static const char *ocllib[] = { "OpenCL.dll", NULL };
#elif defined(__APPLE__)
static const char *ocllib[] = { "/System/Library/Frameworks/OpenCL.framework/Versions/Current/OpenCL", NULL };
#else
static const char *ocllib[] = { "libOpenCL", "libOpenCL.so", "libOpenCL.so.1", NULL };
#endif
 
 
/* only for debugging: default noop function for all unassigned function pointers */
void dt_dlopencl_noop(void)
{
  /* we should normally never get here */
  fprintf(stderr, "dt_dlopencl internal error: unsupported function call\n");
  raise(SIGABRT);
}
 
 
/* dynamically load OpenCL library and bind needed symbols */
dt_dlopencl_t *dt_dlopencl_init(const char *name)
{
  dt_gmodule_t *module = NULL;
  dt_dlopencl_t *ocl;
  const char *library = NULL;
  int success;
 
  /* check if our platform supports gmodules */
  success = dt_gmodule_supported();
  if(!success) return NULL;
 
  /* try to load library. if a name is given check only that library - else iterate over default names. */
  if(!IS_NULL_PTR(name) && name[0] != '\0')
  {
    library = name;
    module = dt_gmodule_open(library);
    if(IS_NULL_PTR(module))
      dt_vprint(DT_DEBUG_OPENCL, "[dt_dlopencl_init] could not find opencl runtime library '%s'\n", library);
    else
      dt_vprint(DT_DEBUG_OPENCL, "[dt_dlopencl_init] found opencl runtime library '%s'\n", library);
  }
  else
  {
    const char **iter = ocllib;
    while(*iter && (IS_NULL_PTR(module)))
    {
      library = *iter;
      module = dt_gmodule_open(library);
      if(IS_NULL_PTR(module))
        dt_vprint(DT_DEBUG_OPENCL, "[dt_dlopencl_init] could not find opencl runtime library '%s'\n", library);
      else
        dt_vprint(DT_DEBUG_OPENCL, "[dt_dlopencl_init] found opencl runtime library '%s'\n", library);
      iter++;
    }
  }
 
  if(IS_NULL_PTR(module))
    return NULL;
  else
  {
    /* now bind symbols */
    success = TRUE;
    ocl = (dt_dlopencl_t *)malloc(sizeof(dt_dlopencl_t));
 
    if(IS_NULL_PTR(ocl))
    {
      dt_free(module);
      return NULL;
    }
 
    ocl->symbols = (dt_dlopencl_symbols_t *)calloc(1, sizeof(dt_dlopencl_symbols_t));
 
    if(IS_NULL_PTR(ocl->symbols))
    {
      dt_free(ocl);
      dt_free(module);
      return NULL;
    }
 
    ocl->library = module->library;
 
    /* assign noop function as a default to each function pointer */
    void (**slist)(void) = (void (**)(void))ocl->symbols;
    /* sanity check against padding */
    if(sizeof(dt_dlopencl_symbols_t) % sizeof(void (*)(void)) == 0)
      for(int k = 0; k < sizeof(dt_dlopencl_symbols_t) / sizeof(void (*)(void)); k++) slist[k] = dt_dlopencl_noop;
 
    /* only bind needed symbols */
    success = success && dt_gmodule_symbol(module, "clGetPlatformIDs",
                                           (void (**)(void)) & ocl->symbols->dt_clGetPlatformIDs);
    success = success && dt_gmodule_symbol(module, "clGetPlatformInfo",
                                           (void (**)(void)) & ocl->symbols->dt_clGetPlatformInfo);
    success = success && dt_gmodule_symbol(module, "clGetDeviceIDs",
                                           (void (**)(void)) & ocl->symbols->dt_clGetDeviceIDs);
    success = success && dt_gmodule_symbol(module, "clGetDeviceInfo",
                                           (void (**)(void)) & ocl->symbols->dt_clGetDeviceInfo);
    success = success && dt_gmodule_symbol(module, "clCreateContext",
                                           (void (**)(void)) & ocl->symbols->dt_clCreateContext);
    success = success && dt_gmodule_symbol(module, "clCreateCommandQueue",
                                           (void (**)(void)) & ocl->symbols->dt_clCreateCommandQueue);
    success = success && dt_gmodule_symbol(module, "clCreateProgramWithSource",
                                           (void (**)(void)) & ocl->symbols->dt_clCreateProgramWithSource);
    success = success && dt_gmodule_symbol(module, "clBuildProgram",
                                           (void (**)(void)) & ocl->symbols->dt_clBuildProgram);
    success = success && dt_gmodule_symbol(module, "clGetProgramBuildInfo",
                                           (void (**)(void)) & ocl->symbols->dt_clGetProgramBuildInfo);
    success = success && dt_gmodule_symbol(module, "clCreateKernel",
                                           (void (**)(void)) & ocl->symbols->dt_clCreateKernel);
    success = success && dt_gmodule_symbol(module, "clCreateBuffer",
                                           (void (**)(void)) & ocl->symbols->dt_clCreateBuffer);
    success = success && dt_gmodule_symbol(module, "clCreateImage2D",
                                           (void (**)(void)) & ocl->symbols->dt_clCreateImage2D);
    success = success && dt_gmodule_symbol(module, "clEnqueueWriteBuffer",
                                           (void (**)(void)) & ocl->symbols->dt_clEnqueueWriteBuffer);
    success = success && dt_gmodule_symbol(module, "clSetKernelArg",
                                           (void (**)(void)) & ocl->symbols->dt_clSetKernelArg);
    success = success && dt_gmodule_symbol(module, "clGetKernelWorkGroupInfo",
                                           (void (**)(void)) & ocl->symbols->dt_clGetKernelWorkGroupInfo);
    success = success && dt_gmodule_symbol(module, "clEnqueueNDRangeKernel",
                                           (void (**)(void)) & ocl->symbols->dt_clEnqueueNDRangeKernel);
    success = success && dt_gmodule_symbol(module, "clEnqueueReadImage",
                                           (void (**)(void)) & ocl->symbols->dt_clEnqueueReadImage);
    success = success && dt_gmodule_symbol(module, "clEnqueueWriteImage",
                                           (void (**)(void)) & ocl->symbols->dt_clEnqueueWriteImage);
    success = success && dt_gmodule_symbol(module, "clEnqueueCopyImage",
                                           (void (**)(void)) & ocl->symbols->dt_clEnqueueCopyImage);
    success = success && dt_gmodule_symbol(module, "clEnqueueCopyImageToBuffer",
                                           (void (**)(void)) & ocl->symbols->dt_clEnqueueCopyImageToBuffer);
    success = success && dt_gmodule_symbol(module, "clEnqueueCopyBufferToImage",
                                           (void (**)(void)) & ocl->symbols->dt_clEnqueueCopyBufferToImage);
    success = success && dt_gmodule_symbol(module, "clFinish", (void (**)(void)) & ocl->symbols->dt_clFinish);
    success = success && dt_gmodule_symbol(module, "clEnqueueReadBuffer",
                                           (void (**)(void)) & ocl->symbols->dt_clEnqueueReadBuffer);
    success = success && dt_gmodule_symbol(module, "clReleaseMemObject",
                                           (void (**)(void)) & ocl->symbols->dt_clReleaseMemObject);
    success = success && dt_gmodule_symbol(module, "clReleaseProgram",
                                           (void (**)(void)) & ocl->symbols->dt_clReleaseProgram);
    success = success && dt_gmodule_symbol(module, "clReleaseKernel",
                                           (void (**)(void)) & ocl->symbols->dt_clReleaseKernel);
    success = success && dt_gmodule_symbol(module, "clReleaseCommandQueue",
                                           (void (**)(void)) & ocl->symbols->dt_clReleaseCommandQueue);
    success = success && dt_gmodule_symbol(module, "clReleaseContext",
                                           (void (**)(void)) & ocl->symbols->dt_clReleaseContext);
    success = success && dt_gmodule_symbol(module, "clReleaseEvent",
                                           (void (**)(void)) & ocl->symbols->dt_clReleaseEvent);
    success = success && dt_gmodule_symbol(module, "clWaitForEvents",
                                           (void (**)(void)) & ocl->symbols->dt_clWaitForEvents);
    success = success && dt_gmodule_symbol(module, "clGetEventInfo",
                                           (void (**)(void)) & ocl->symbols->dt_clGetEventInfo);
    success = success && dt_gmodule_symbol(module, "clGetEventProfilingInfo",
                                           (void (**)(void)) & ocl->symbols->dt_clGetEventProfilingInfo);
    success = success && dt_gmodule_symbol(module, "clGetKernelInfo",
                                           (void (**)(void)) & ocl->symbols->dt_clGetKernelInfo);
    success = success && dt_gmodule_symbol(module, "clEnqueueBarrier",
                                           (void (**)(void)) & ocl->symbols->dt_clEnqueueBarrier);
    success = success && dt_gmodule_symbol(module, "clFlush",
                                           (void (**)(void)) & ocl->symbols->dt_clFlush);
    success = success && dt_gmodule_symbol(module, "clGetKernelWorkGroupInfo",
                                           (void (**)(void)) & ocl->symbols->dt_clGetKernelWorkGroupInfo);
    success = success && dt_gmodule_symbol(module, "clEnqueueReadBuffer",
                                           (void (**)(void)) & ocl->symbols->dt_clEnqueueReadBuffer);
    success = success && dt_gmodule_symbol(module, "clEnqueueWriteBuffer",
                                           (void (**)(void)) & ocl->symbols->dt_clEnqueueWriteBuffer);
    success = success && dt_gmodule_symbol(module, "clGetProgramInfo",
                                           (void (**)(void)) & ocl->symbols->dt_clGetProgramInfo);
    success = success && dt_gmodule_symbol(module, "clCreateProgramWithBinary",
                                           (void (**)(void)) & ocl->symbols->dt_clCreateProgramWithBinary);
    success = success && dt_gmodule_symbol(module, "clEnqueueCopyBuffer",
                                           (void (**)(void)) & ocl->symbols->dt_clEnqueueCopyBuffer);
    success = success && dt_gmodule_symbol(module, "clEnqueueMapBuffer",
                                           (void (**)(void)) & ocl->symbols->dt_clEnqueueMapBuffer);
    success = success && dt_gmodule_symbol(module, "clEnqueueMapImage",
                                           (void (**)(void)) & ocl->symbols->dt_clEnqueueMapImage);
    success = success && dt_gmodule_symbol(module, "clEnqueueUnmapMemObject",
                                           (void (**)(void)) & ocl->symbols->dt_clEnqueueUnmapMemObject);
    success = success && dt_gmodule_symbol(module, "clGetMemObjectInfo",
                                           (void (**)(void)) & ocl->symbols->dt_clGetMemObjectInfo);
    success = success && dt_gmodule_symbol(module, "clGetImageInfo",
                                           ((void (**)(void)) & ocl->symbols->dt_clGetImageInfo));
 
    ocl->have_opencl = success;
 
    if(!success)
      dt_print(DT_DEBUG_OPENCL, "[opencl_init] could not load all required symbols from library\n");
  }
 
  dt_free(module);
 
  if(!success)
  {
    dt_free(ocl->symbols);
    dt_free(ocl);
    return NULL;
  }
 
  return ocl;
}
 
#endif
 
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