/* This file is an image processing operation for GEGL

 *

 * GEGL 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 3 of the License, or (at your option) any later version.

 *

 * GEGL 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 for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with GEGL; if not, see <http://www.gnu.org/licenses/>.

 *

 * Copyright 2006 Øyvind Kolås <pippin@gimp.org>

 */

#include "config.h"

#include <glib/gi18n-lib.h>

#ifdef GEGL_CHANT_PROPERTIES

   /* no properties */

#else

#define GEGL_CHANT_TYPE_POINT_FILTER

#define GEGL_CHANT_C_FILE       "grey.c"

#include "gegl-chant.h"

static void prepare (GeglOperation *operation)

{

  const Babl *format = babl_format ("YA float");

  gegl_operation_set_format (operation, "input", format);

  gegl_operation_set_format (operation, "output", format);

}

/* XXX: could be sped up by special casing op-filter behavior */

static gboolean

process (GeglOperation       *op,

         void                *in_buf,

         void                *out_buf,

         glong                samples,

         const GeglRectangle *roi,

         gint                 level)

{

  float *in = in_buf;

  float *out = out_buf;

  while (samples--)

    {

      *out++ = *in++;

      *out++ = *in++;

    }

  return TRUE;

}

#include "opencl/gegl-cl.h"

static cl_int

cl_process (GeglOperation       *op,

            cl_mem               in_tex,

            cl_mem               out_tex,

            size_t               global_worksize,

            const GeglRectangle *roi,

            gint                 level)

{

  cl_int cl_err = 0;

  cl_err = gegl_clEnqueueCopyBuffer(gegl_cl_get_command_queue(),

                                    in_tex , out_tex , 0 , 0 ,

                                    global_worksize * sizeof (cl_float2),

                                    0, NULL, NULL);

  if (CL_SUCCESS != cl_err) return cl_err;

  return cl_err;

}

static void

gegl_chant_class_init (GeglChantClass *klass)

{

  GeglOperationClass            *operation_class;

  GeglOperationPointFilterClass *point_filter_class;

  operation_class = GEGL_OPERATION_CLASS (klass);

  point_filter_class = GEGL_OPERATION_POINT_FILTER_CLASS (klass);

  point_filter_class->process = process;

  point_filter_class->cl_process = cl_process;

  operation_class->prepare = prepare;

  operation_class->opencl_support = TRUE;

  gegl_operation_class_set_keys (operation_class,

      "name"       , "gegl:grey",

      "categories" , "color",

      "description", _("Turns the image greyscale"),

      NULL);

}

#endif