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;;; guile-sdl2 --- FFI bindings for SDL2
;;; Copyright © 2022 David Thompson <davet@gnu.org>
;;;
;;; This file is part of guile-sdl2.
;;;
;;; Guile-sdl2 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.
;;;
;;; Guile-sdl2 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 Lesser General Public
;;; License along with guile-sdl2. If not, see
;;; <http://www.gnu.org/licenses/>.
;;; Commentary:
;;
;; Accelerometer/gyroscope input.
;;
;;; Code:
(define-module (sdl2 input sensor)
#:use-module (sdl2)
#:use-module ((sdl2 bindings) #:prefix ffi:)
#:use-module (system foreign)
#:export (instance-id->sensor
num-sensors
open-sensor
sensor-close
sensor-device-instance-id
sensor-device-name
sensor-device-non-portable-type
sensor-device-type
sensor-instance-id
sensor-name
sensor-non-portable-type
sensor-type
update-sensors))
(define-wrapped-pointer-type <sensor>
sensor?
wrap-sensor unwrap-sensor
(lambda (sensor port)
(format port "#<sensor ~a>"
(sensor-name sensor))))
(define (num-sensors)
(ffi:sdl-num-sensors))
(define (sensor-device-name device-index)
"Return the name of the sensor at DEVICE-INDEX, or #f if there is no
sensor with that index."
(let ((ptr (ffi:sdl-sensor-get-device-name device-index)))
(if (null-pointer? ptr)
#f
(pointer->string ptr))))
(define (type-enum->symbol type)
(cond
((= type ffi:SDL_SENSOR_INVALID) #f)
((= type ffi:SDL_SENSOR_UNKNOWN) 'unknown)
((= type ffi:SDL_SENSOR_ACCEL) 'accelerometer)
((= type ffi:SDL_SENSOR_GYRO) 'gyroscope)
((= type ffi:SDL_SENSOR_ACCEL_L) 'accelerometer-left)
((= type ffi:SDL_SENSOR_GYRO_L) 'gyroscope-left)
((= type ffi:SDL_SENSOR_ACCEL_R) 'accelerometer-right)
((= type ffi:SDL_SENSOR_GYRO_R) 'gyroscope-right)))
(define (sensor-device-type device-index)
"Return the type of the sensor at DEVICE-INDEX, or #f if there is no
sensor with that index."
(type-enum->symbol (ffi:sdl-sensor-get-device-type device-index)))
(define (sensor-device-non-portable-type device-index)
"Return the non-portable device type of the sensor at DEVICE-INDEX, or
#f if there is no sensor with that index."
(let ((type (ffi:sdl-sensor-get-device-non-portable-type device-index)))
(if (= type -1) #f type)))
(define (sensor-device-instance-id device-index)
"Return the instance ID of the sensor at DEVICE-INDEX, or #f if there
is no sensor with that index."
(let ((id (ffi:sdl-sensor-get-device-instance-id device-index)))
(if (= id -1) #f id)))
(define (open-sensor device-index)
"Return a sensor object for the sensor at DEVICE-INDEX."
(let ((ptr (ffi:sdl-sensor-open device-index)))
(if (null-pointer? ptr)
(sdl-error "open-sensor" "failed to open sensor")
(wrap-sensor ptr))))
(define (instance-id->sensor instance-id)
"Return the sensor object associated with INSTANCE-ID."
(let ((ptr (ffi:sdl-sensor-from-instance-id instance-id)))
(if (null-pointer? ptr)
(sdl-error "instance-id->sensor" "failed to get sensor")
(wrap-sensor ptr))))
(define (sensor-name sensor)
"Return the name of SENSOR."
(pointer->string (ffi:sdl-sensor-get-name (unwrap-sensor sensor))))
(define (sensor-type sensor)
"Return the type of SENSOR."
(type-enum->symbol (ffi:sdl-sensor-get-type (unwrap-sensor sensor))))
(define (sensor-non-portable-type sensor)
"Return the type of SENSOR."
(let ((type (ffi:sdl-sensor-get-non-portable-type (unwrap-sensor sensor))))
(if (= type -1) #f type)))
(define (sensor-instance-id sensor)
"Return the instance ID of SENSOR."
(ffi:sdl-sensor-get-instance-id (unwrap-sensor sensor)))
(define (sensor-close sensor)
"Close SENSOR."
(ffi:sdl-sensor-close (unwrap-sensor sensor)))
(define (update-sensors)
"Update the current state of the open sensors."
(ffi:sdl-sensor-update))
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