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;;; Sly
;;; Copyright (C) 2014 Jordan Russell <jordan.likes.curry@gmail.com>
;;;
;;; This program 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 Foundation, either version 3 of the
;;; License, or (at your option) any later version.
;;;
;;; This program 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 this program. If not, see
;;; <http://www.gnu.org/licenses/>.
;;; Commentary:
;;
;; Joystick signals
;;
;;; Code:
(define-module (sly input joystick)
#:use-module ((sdl sdl) #:prefix SDL:)
#:use-module (sly event)
#:use-module (sly signal)
#:use-module (sly math vector)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-9)
#:re-export ((SDL:joystick-name . joystick-name)
(SDL:num-joysticks . num-joysticks))
#:export (enable-joystick
joystick-num-axes
joystick-num-buttons
joystick-axis-hook
joystick-button-press-hook
joystick-button-release-hook
axis-value-raw
raw-axis-max
raw-axis-min
axis-value
button-down?
make-directional-signal
make-directional-signal-raw
axis-scale))
(define *joysticks* '())
(define (enable-joystick)
(set! *joysticks*
(map SDL:joystick-open
(iota (SDL:num-joysticks)))))
(define (get-joystick idx)
(list-ref *joysticks* idx))
(define-syntax-rule (js-proc->idx-proc (js-proc . name) doc)
(define (name idx)
doc
(if (> idx (SDL:num-joysticks))
0
(js-proc (get-joystick idx)))))
(js-proc->idx-proc (SDL:joystick-num-axes . joystick-num-axes)
"Get number of axes of joystick at IDX.")
(js-proc->idx-proc (SDL:joystick-num-buttons . joystick-num-buttons)
"Get number of buttons of joystick at IDX.")
(define joystick-axis-hook (make-hook 3))
(register-event-handler
'joy-axis-motion
(lambda (e)
(run-hook joystick-axis-hook
(SDL:event:jaxis:which e)
(SDL:event:jaxis:axis e)
(SDL:event:jaxis:value e))))
(define-record-type <axis-event>
(make-axis-event which axis value)
axis-event?
(which axis-event-joystick)
(axis axis-event-axis)
(value axis-event-value))
(define joystick-button-press-hook (make-hook 2))
(register-event-handler
'joy-button-down
(lambda (e)
(run-hook joystick-button-press-hook
(SDL:event:jbutton:which e)
(SDL:event:jbutton:button e))))
(define joystick-button-release-hook (make-hook 2))
(register-event-handler
'joy-button-up
(lambda (e)
(run-hook joystick-button-release-hook
(SDL:event:jbutton:which e)
(SDL:event:jbutton:button e))))
(define-signal last-axis-event
(hook->signal joystick-axis-hook 'none
make-axis-event))
(define raw-axis-min -32768)
(define raw-axis-max 32767)
(define (axis-value-raw idx axis)
"Create a signal on the axis at AXIS of the joystick at IDX;
joystick axis values are stored in a signed 16 bit integer and so,
values range from [-32768,32767]."
(signal-map axis-event-value
(signal-filter
(lambda (e)
(and (axis-event? e)
(= (axis-event-joystick e) idx)
(= (axis-event-axis e) axis)))
(make-axis-event idx axis 0)
last-axis-event)))
(define (make-directional-signal-raw idx x-axis y-axis)
"Create a signal for a Dpad or Analog stick with X and Y axes;
values range from [-32768,32767]."
(signal-map vector2
(axis-value-raw idx x-axis)
(axis-value-raw idx y-axis)))
(define (axis-scale raw-value)
"Map a RAW-VALUE in [-32768, 32767] to a value in [-1, 1]."
(define (clamp x)
(cond ((< (abs x) 1/100) 0)
((> x 99/100) 1)
((< x -99/100) -1)
(else x)))
(clamp (/ raw-value 32768)))
(define (axis-value idx axis)
"Create a signal for the value of AXIS on joystick IDX;
values are scaled to [-1,1]."
(signal-map axis-scale (axis-value-raw idx axis)))
(define (make-directional-signal idx x-axis y-axis)
"Create a signal for a Dpad or Analog stick with X and Y axes;
values are scaled to [-1,1]."
(signal-map (lambda (v)
(vector2 (axis-scale (vx v))
(axis-scale (vy v))))
(make-directional-signal-raw idx x-axis y-axis)))
(define-signal button-last-down
(hook->signal joystick-button-press-hook 'none
list))
(define-signal button-last-up
(hook->signal joystick-button-release-hook 'none
list))
;; shamelessly copied from keyboard.scm
(define (button-down? idx n)
"Create a signal for the state of button N on joystick at IDX"
(define (same-button? l)
(equal? (list idx n) l))
(define (button-filter value signal)
(signal-constant value (signal-filter same-button? #f signal)))
(signal-merge (button-filter #f button-last-up)
(button-filter #t button-last-down)))
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