/* StarPU --- Runtime system for heterogeneous multicore architectures.
 *
 * Copyright (C) 2010-2012 University of Bordeaux
 * Copyright (C) 2012 CNRS
 * Copyright (C) 2012 Vincent Danjean <Vincent.Danjean@ens-lyon.org>
 *
 * StarPU is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or (at
 * your option) any later version.
 *
 * StarPU 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 Lesser General Public License in COPYING.LGPL for more details.
 */

#include "socl.h"
#include "init.h"

/**
 * \brief Return one device of each kind
 *
 * \param[in] platform Must be StarPU platform ID or NULL
 */
CL_API_ENTRY cl_int CL_API_CALL
soclGetDeviceIDs(cl_platform_id   platform,
               cl_device_type   device_type,
               cl_uint          num_entries,
               cl_device_id *   devices,
               cl_uint *        num_devices) CL_API_SUFFIX__VERSION_1_0
{
   if( ! _starpu_init )
      socl_init_starpu();

   if (_starpu_init_failed) {
      *num_devices = 0;
      return CL_SUCCESS;
   }

   if (platform != NULL && platform != &socl_platform)
      return CL_INVALID_PLATFORM;

   if ((devices != NULL && num_entries == 0)
      || (devices == NULL && num_devices == NULL))
      return CL_INVALID_VALUE;

   if (!(device_type & (CL_DEVICE_TYPE_CPU | CL_DEVICE_TYPE_GPU | CL_DEVICE_TYPE_ACCELERATOR | CL_DEVICE_TYPE_DEFAULT))
      && (device_type != CL_DEVICE_TYPE_ALL))
      return CL_INVALID_DEVICE_TYPE;

   int ndevs = starpu_worker_get_count_by_type(STARPU_OPENCL_WORKER);

   int workers[ndevs];
   starpu_worker_get_ids_by_type(STARPU_OPENCL_WORKER, workers, ndevs);

   if (socl_devices == NULL) {
      socl_device_count = ndevs;
      socl_devices = malloc(sizeof(struct _cl_device_id) * ndevs);
      int i;
      for (i=0; i < ndevs; i++) {
         int devid = starpu_worker_get_devid(workers[i]);
         socl_devices[i].dispatch = &socl_master_dispatch;
         socl_devices[i].worker_id = workers[i];
         socl_devices[i].device_id = devid;
      }
   }
  

   int i;
   unsigned int num = 0;
   for (i=0; i < ndevs; i++) {
      int devid = socl_devices[i].device_id;
      cl_device_id dev;
      starpu_opencl_get_device(devid, &dev);
      cl_device_type typ;
      clGetDeviceInfo(dev, CL_DEVICE_TYPE, sizeof(typ), &typ, NULL);
      if (typ & device_type) {
         if (devices != NULL && num < num_entries) devices[num] = &socl_devices[i];
         num++;
      }
   }

   if (num_devices != NULL)
      *num_devices = num;

   return CL_SUCCESS;
}