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;;; Catbird Game Engine
;;; Copyright © 2022 David Thompson <davet@gnu.org>
;;;
;;; Catbird 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.
;;;
;;; Catbird 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 Catbird. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;;
;; Keyboard, mouse, controller input specification.
;;
;;; Code:
(define-module (catbird input-map)
#:use-module (ice-9 match)
#:use-module (srfi srfi-1)
#:export (make-input-map
add-input
remove-input
key-press
key-release
text-input
mouse-press
mouse-release
mouse-move
mouse-wheel
controller-press
controller-release
controller-move
key-press-handler
key-release-handler
text-input-handler
mouse-press-handler
mouse-release-handler
mouse-move-handler
mouse-wheel-handler
controller-press-handler
controller-release-handler
controller-move-handler))
(define (make-input-map)
'())
(define (add-input input-map spec handler)
(cons (cons spec handler)
input-map))
(define (remove-input input-map spec)
(delete spec input-map
(match-lambda*
((a (b . _))
(equal? a b)))))
(define* (key-press key #:optional (modifiers '()))
`(keyboard ,key ,modifiers down))
(define* (key-release key #:optional (modifiers '()))
`(keyboard ,key ,modifiers up))
(define (text-input)
'(text-input))
(define (mouse-press button)
`(mouse button ,button down))
(define (mouse-release button)
`(mouse button ,button up))
(define* (mouse-move #:optional (buttons '()))
`(mouse move ,buttons))
(define* (mouse-wheel)
'(mouse wheel))
(define (controller-press id button)
`(controller button ,id ,button down))
(define (controller-release id button)
`(controller button ,id ,button up))
(define (controller-move id axis)
`(controller axis ,id ,axis))
;; Chickadee is specific about which modifier keys are pressed and
;; makes distinctions between left and right ctrl, for example. For
;; convenience, we want users to be able to specify simply 'ctrl' and
;; it will match both left and right.
(define (modifiers-match? spec-modifiers modifiers)
(every (lambda (k)
(case k
;; The specification is looking for a specific modifier
;; key.
((left-ctrl right-ctrl left-alt right-alt left-shift right-shift)
(memq k modifiers))
;; The specification is looking for either left/right
;; modifier key.
((ctrl)
(or (memq 'left-control modifiers)
(memq 'right-control modifiers)))
((alt)
(or (memq 'left-alt modifiers)
(memq 'right-alt modifiers)))
((shift)
(or (memq 'left-shift modifiers)
(memq 'right-shift modifiers)))))
spec-modifiers))
(define (key-press-handler input-map key modifiers)
(any (match-lambda
((('keyboard key* modifiers* 'down) . handler)
(and (eq? key key*)
(modifiers-match? modifiers* modifiers)
handler))
(_ #f))
input-map))
(define (key-release-handler input-map key modifiers)
(any (match-lambda
((('keyboard key* modifiers* 'up) . handler)
(and (eq? key key*)
(modifiers-match? modifiers modifiers*)
handler))
(_ #f))
input-map))
(define (text-input-handler input-map)
(any (match-lambda
((('text-input) . handler) handler)
(_ #f))
input-map))
(define (mouse-press-handler input-map button)
(any (match-lambda
((('mouse 'button button* 'down) . handler)
(and (eq? button button*)
handler))
(_ #f))
input-map))
(define (mouse-release-handler input-map button)
(any (match-lambda
((('mouse 'button button* 'up) . handler)
(and (eq? button button*)
handler))
(_ #f))
input-map))
(define (mouse-move-handler input-map buttons)
(any (match-lambda
((('mouse 'move buttons*) . handler)
(and (= (length buttons) (length buttons*))
(every (lambda (b) (memq b buttons*)) buttons)
handler))
(_ #f))
input-map))
(define (mouse-wheel-handler input-map)
(any (match-lambda
((('mouse 'wheel) . handler)
handler)
(_ #f))
input-map))
(define (controller-press-handler input-map controller-id button)
(any (match-lambda
((('controller 'button controller-id* button* 'down) . handler)
(and (= controller-id controller-id*)
(eq? button button*)
handler))
(_ #f))
input-map))
(define (controller-release-handler input-map controller-id button)
(any (match-lambda
((('controller 'button controller-id* button* 'up) . handler)
(and (= controller-id controller-id*)
(eq? button button*)
handler))
(_ #f))
input-map))
(define (controller-move-handler input-map controller-id axis)
(any (match-lambda
((('controller 'axis controller-id* axis*) . handler)
(and (= controller-id controller-id*)
(eq? axis axis*)
handler))
(_ #f))
input-map))
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