/*
 * Cogl
 *
 * An object oriented GL/GLES Abstraction/Utility Layer
 *
 * Copyright (C) 2011 Intel Corporation.
 *
 * This library 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 of the License, or (at your option) any later version.
 *
 * This library 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 this library. If not, see
 * <http://www.gnu.org/licenses/>.
 *
 *
 *
 * Authors:
 *   Neil Roberts <neil@linux.intel.com>
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <string.h>

#include "cogl-pipeline-snippet-private.h"

/* Helper functions that are used by both GLSL pipeline backends */

void
_cogl_pipeline_snippet_generate_code (const CoglPipelineSnippetData *data)
{
  CoglPipelineSnippet *snippet;
  int snippet_num = 0;

  COGL_LIST_FOREACH (snippet, data->snippets, list_node)
    if (snippet->hook == data->hook)
      {
        const char *source;

        if ((source = cogl_snippet_get_declarations (snippet->snippet)))
          g_string_append (data->source_buf, source);

        g_string_append_printf (data->source_buf,
                                "\n"
                                "%s\n",
                                data->return_type ?
                                data->return_type :
                                "void");

        if (COGL_LIST_NEXT (snippet, list_node))
          g_string_append_printf (data->source_buf,
                                  "%s_%i",
                                  data->function_prefix,
                                  snippet_num);
        else
          g_string_append (data->source_buf, data->final_name);

        g_string_append (data->source_buf, " (");

        if (data->argument_declarations)
          g_string_append (data->source_buf, data->argument_declarations);

        g_string_append (data->source_buf,
                         ")\n"
                         "{\n");

        if (data->return_type)
          g_string_append_printf (data->source_buf,
                                  "  %s %s;\n"
                                  "\n",
                                  data->return_type,
                                  data->return_variable);

        if ((source = cogl_snippet_get_pre (snippet->snippet)))
          g_string_append (data->source_buf, source);

        /* Chain on to the next function, or bypass it if there is
           a replace string */
        if ((source = cogl_snippet_get_replace (snippet->snippet)))
          g_string_append (data->source_buf, source);
        else
          {
            g_string_append (data->source_buf, "  ");

            if (data->return_type)
              g_string_append_printf (data->source_buf,
                                      "%s = ",
                                      data->return_variable);

            if (snippet_num > 0)
              g_string_append_printf (data->source_buf,
                                      "%s_%i",
                                      data->function_prefix,
                                      snippet_num - 1);
            else
              g_string_append (data->source_buf, data->chain_function);

            g_string_append (data->source_buf, " (");

            if (data->arguments)
              g_string_append (data->source_buf, data->arguments);

            g_string_append (data->source_buf, ");\n");
          }

        if ((source = cogl_snippet_get_post (snippet->snippet)))
          g_string_append (data->source_buf, source);

        if (data->return_type)
          g_string_append_printf (data->source_buf,
                                  "  return %s;\n",
                                  data->return_variable);

        g_string_append (data->source_buf, "}\n");

        snippet_num++;
      }

  /* If there weren't any snippets then generate a stub function with
     the final name */
  if (snippet_num == 0)
    {
      if (data->return_type)
        g_string_append_printf (data->source_buf,
                                "\n"
                                "%s\n"
                                "%s (%s)\n"
                                "{\n"
                                "  return %s (%s);\n"
                                "}\n",
                                data->return_type,
                                data->final_name,
                                data->argument_declarations ?
                                data->argument_declarations : "",
                                data->chain_function,
                                data->arguments ? data->arguments : "");
      else
        g_string_append_printf (data->source_buf,
                                "\n"
                                "void\n"
                                "%s (%s)\n"
                                "{\n"
                                "  %s (%s);\n"
                                "}\n",
                                data->final_name,
                                data->argument_declarations ?
                                data->argument_declarations : "",
                                data->chain_function,
                                data->arguments ? data->arguments : "");
    }
}