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(module input
(create-input-state
input-state-update!
input-pressed?
input-held?
input-released?
input-any-pressed?)
(import scheme
(chicken base)
(chicken module)
(only srfi-1 any)
(prefix sdl2 sdl2:))
;; Input state record - tracks current and previous frame state
(define-record input-state
up down left right a b start select
prev-up prev-down prev-left prev-right prev-a prev-b prev-start prev-select)
;; Create a new input state with all buttons released
(define (create-input-state)
(make-input-state #f #f #f #f #f #f #f #f
#f #f #f #f #f #f #f #f))
;; Button name to keyboard scancode mapping
(define *keyboard-map*
'((up . w)
(down . s)
(left . a)
(right . d)
(a . j)
(b . k)
(start . return)
(select . backspace)))
;; Button name to gamepad button mapping
(define *gamepad-button-map*
'((a . 0) ; Button 0 (typically A/Cross)
(b . 1) ; Button 1 (typically B/Circle)
(start . 9) ; Button 9 (Start)
(select . 8))) ; Button 8 (Select)
;; Update input state based on SDL2 events
;; This should be called once per frame AFTER processing events
;; Pass the event list from your game loop
(define (input-state-update! state events)
;; Save previous frame state
(input-state-prev-up-set! state (input-state-up state))
(input-state-prev-down-set! state (input-state-down state))
(input-state-prev-left-set! state (input-state-left state))
(input-state-prev-right-set! state (input-state-right state))
(input-state-prev-a-set! state (input-state-a state))
(input-state-prev-b-set! state (input-state-b state))
(input-state-prev-start-set! state (input-state-start state))
(input-state-prev-select-set! state (input-state-select state))
;; Process events to update current state
(for-each
(lambda (event)
(let ((type (sdl2:event-type event)))
(cond
;; Keyboard events
((eq? type 'key-down)
(let ((key (sdl2:keyboard-event-sym event)))
(cond
((eq? key 'w) (input-state-up-set! state #t))
((eq? key 's) (input-state-down-set! state #t))
((eq? key 'a) (input-state-left-set! state #t))
((eq? key 'd) (input-state-right-set! state #t))
((eq? key 'j) (input-state-a-set! state #t))
((eq? key 'k) (input-state-b-set! state #t))
((eq? key 'return) (input-state-start-set! state #t))
((eq? key 'backspace) (input-state-select-set! state #t)))))
((eq? type 'key-up)
(let ((key (sdl2:keyboard-event-sym event)))
(cond
((eq? key 'w) (input-state-up-set! state #f))
((eq? key 's) (input-state-down-set! state #f))
((eq? key 'a) (input-state-left-set! state #f))
((eq? key 'd) (input-state-right-set! state #f))
((eq? key 'j) (input-state-a-set! state #f))
((eq? key 'k) (input-state-b-set! state #f))
((eq? key 'return) (input-state-start-set! state #f))
((eq? key 'backspace) (input-state-select-set! state #f)))))
;; Joystick button events
((eq? type 'joy-button-down)
(let ((button (sdl2:joy-button-event-button event)))
(cond
((= button 0) (input-state-a-set! state #t))
((= button 1) (input-state-b-set! state #t))
((= button 8) (input-state-select-set! state #t))
((= button 9) (input-state-start-set! state #t)))))
((eq? type 'joy-button-up)
(let ((button (sdl2:joy-button-event-button event)))
(cond
((= button 0) (input-state-a-set! state #f))
((= button 1) (input-state-b-set! state #f))
((= button 8) (input-state-select-set! state #f))
((= button 9) (input-state-start-set! state #f)))))
;; Joystick hat (d-pad) events
((eq? type 'joy-hat-motion)
(let ((value (sdl2:joy-hat-event-value event)))
(input-state-up-set! state (or (= value 1) (= value 9) (= value 5))) ; UP, LEFT-UP, RIGHT-UP
(input-state-down-set! state (or (= value 4) (= value 6) (= value 10))) ; DOWN, LEFT-DOWN, RIGHT-DOWN
(input-state-left-set! state (or (= value 8) (= value 9) (= value 6))) ; LEFT, LEFT-UP, LEFT-DOWN
(input-state-right-set! state (or (= value 2) (= value 5) (= value 10))))) ; RIGHT, RIGHT-UP, RIGHT-DOWN
;; Joystick axis (analog stick as d-pad)
((eq? type 'joy-axis-motion)
(let ((axis (sdl2:joy-axis-event-axis event))
(value (sdl2:joy-axis-event-value event)))
(cond
((= axis 0) ; X-axis
(input-state-left-set! state (< value -8000))
(input-state-right-set! state (> value 8000)))
((= axis 1) ; Y-axis
(input-state-up-set! state (< value -8000))
(input-state-down-set! state (> value 8000)))))))))
events))
;; Check if a button was just pressed this frame
(define (input-pressed? state button)
(let ((current (case button
((up) (input-state-up state))
((down) (input-state-down state))
((left) (input-state-left state))
((right) (input-state-right state))
((a) (input-state-a state))
((b) (input-state-b state))
((start) (input-state-start state))
((select) (input-state-select state))
(else #f)))
(previous (case button
((up) (input-state-prev-up state))
((down) (input-state-prev-down state))
((left) (input-state-prev-left state))
((right) (input-state-prev-right state))
((a) (input-state-prev-a state))
((b) (input-state-prev-b state))
((start) (input-state-prev-start state))
((select) (input-state-prev-select state))
(else #f))))
(and current (not previous))))
;; Check if a button is currently held down
(define (input-held? state button)
(case button
((up) (input-state-up state))
((down) (input-state-down state))
((left) (input-state-left state))
((right) (input-state-right state))
((a) (input-state-a state))
((b) (input-state-b state))
((start) (input-state-start state))
((select) (input-state-select state))
(else #f)))
;; Check if a button was just released this frame
(define (input-released? state button)
(let ((current (case button
((up) (input-state-up state))
((down) (input-state-down state))
((left) (input-state-left state))
((right) (input-state-right state))
((a) (input-state-a state))
((b) (input-state-b state))
((start) (input-state-start state))
((select) (input-state-select state))
(else #f)))
(previous (case button
((up) (input-state-prev-up state))
((down) (input-state-prev-down state))
((left) (input-state-prev-left state))
((right) (input-state-prev-right state))
((a) (input-state-prev-a state))
((b) (input-state-prev-b state))
((start) (input-state-prev-start state))
((select) (input-state-prev-select state))
(else #f))))
(and (not current) previous)))
;; Check if any button was pressed this frame
(define (input-any-pressed? state)
(any (lambda (button)
(input-pressed? state button))
'(up down left right a b start select)))
) ; end module
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