location_driver.h

/*  RetroArch - A frontend for libretro.
 *  Copyright (C) 2018 The RetroArch team
 *
 *  RetroArch 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 Found-
 *  ation, either version 3 of the License, or (at your option) any later version.
 *
 *  RetroArch 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 RetroArch.
 *  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef __LOCATION_DRIVER__H
#define __LOCATION_DRIVER__H

#include <boolean.h>
#include <retro_common_api.h>

#include "configuration.h"

RETRO_BEGIN_DECLS

typedef struct location_driver
{
   void *(*init)(void);
   void (*free)(void *data);

   bool (*start)(void *data);
   void (*stop)(void *data);

   bool (*get_position)(void *data, double *lat, double *lon,
         double *horiz_accuracy, double *vert_accuracy);
   void (*set_interval)(void *data, unsigned interval_msecs,
         unsigned interval_distance);
   const char *ident;
} location_driver_t;


typedef struct
{
   const location_driver_t *driver;
   void *data;
   bool active;
} location_driver_state_t;

/**
 * config_get_location_driver_options:
 *
 * Get an enumerated list of all location driver names,
 * separated by '|'.
 *
 * Returns: string listing of all location driver names,
 * separated by '|'.
 **/
const char* config_get_location_driver_options(void);

/**
 * driver_location_get_position:
 * @lat                : Latitude of current position.
 * @lon                : Longitude of current position.
 * @horiz_accuracy     : Horizontal accuracy.
 * @vert_accuracy      : Vertical accuracy.
 *
 * Gets current positioning information from
 * location driver interface.
 * Used by RETRO_ENVIRONMENT_GET_LOCATION_INTERFACE.
 *
 * Returns: bool (1) if successful, otherwise false (0).
 **/
bool driver_location_get_position(double *lat, double *lon,
      double *horiz_accuracy, double *vert_accuracy);

/**
 * driver_location_set_interval:
 * @interval_msecs     : Interval time in milliseconds.
 * @interval_distance  : Distance at which to update.
 *
 * Sets interval update time for location driver interface.
 * Used by RETRO_ENVIRONMENT_GET_LOCATION_INTERFACE.
 **/
void driver_location_set_interval(unsigned interval_msecs,
      unsigned interval_distance);

/**
 * driver_location_stop:
 *
 * Stops location driver interface..
 * Used by RETRO_ENVIRONMENT_GET_LOCATION_INTERFACE.
 *
 * Returns: true (1) if successful, otherwise false (0).
 **/
void driver_location_stop(void);

/**
 * driver_location_start:
 *
 * Starts location driver interface..
 * Used by RETRO_ENVIRONMENT_GET_LOCATION_INTERFACE.
 *
 * Returns: true (1) if successful, otherwise false (0).
 **/
bool driver_location_start(void);

void destroy_location(void);

void location_driver_find_driver(
      settings_t *settings,
      const char *prefix,
      bool verbosity_enabled);

void uninit_location(void *data);

bool init_location(
      void *data,
      settings_t *settings,
      bool verbosity_enabled);

location_driver_state_t *location_state_get_ptr(void);

extern location_driver_t location_corelocation;
extern location_driver_t location_android;

extern const location_driver_t *location_drivers[];

RETRO_END_DECLS

#endif