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(use-modules (chickadee)
(chickadee math vector)
(chickadee render color)
(chickadee render font)
(chickadee render sprite)
(chickadee render texture)
(ice-9 match))
(define batch #f)
(define controller #f)
(define atlas #f)
(define button-icons
`((dpad-down ,(vec2 110.0 140.0) 7 25)
(dpad-right ,(vec2 170.0 210.0) 9 27)
(dpad-left ,(vec2 50.0 210.0) 8 26)
(dpad-up ,(vec2 110.0 280.0) 6 24)
(a ,(vec2 450.0 140.0) 0 18)
(b ,(vec2 510.0 210.0) 1 19)
(x ,(vec2 390.0 210.0) 2 20)
(y ,(vec2 450.0 280.0) 3 21)
(back ,(vec2 190.0 330.0) 11 29)
(guide ,(vec2 280.0 330.0) 12 30)
(start ,(vec2 370.0 330.0) 10 28)
(left-stick ,(vec2 110.0 20.0) 13 31)
(right-stick ,(vec2 450.0 20.0) 13 31)
(left-shoulder ,(vec2 110.0 390.0) 4 22)
(right-shoulder ,(vec2 450.0 390.0) 5 23)))
(define trigger-icons
`((trigger-left ,(vec2 10.0 390.0) 22)
(trigger-right ,(vec2 550.0 390.0) 23)))
(define no-controller-msg "no controller detected :'(")
(define no-controller-msg-pos #f)
(define controller-name-pos #f)
(define (center-text text)
(/ (- 640.0 (font-line-width (default-font) text)) 2.0))
(define (load)
(set! no-controller-msg-pos (vec2 (center-text no-controller-msg) 240.0))
(let ((texture (load-image "images/controller-buttons.png")))
(set! atlas (split-texture texture 80 80))
(set! batch (make-sprite-batch texture))))
(define (controller-add new-controller)
(set! controller (or controller new-controller))
(set! controller-name-pos
(vec2 (center-text (controller-name controller)) 440.0)))
(define (draw alpha)
(if controller
(begin
(sprite-batch-clear! batch)
(draw-text (controller-name controller) controller-name-pos)
(for-each (match-lambda
((axis p tile)
(let ((alpha (controller-axis controller axis)))
(sprite-batch-add!
batch p
#:texture-region (texture-atlas-ref atlas tile)
#:tint (color 1.0 1.0 1.0 alpha)))))
trigger-icons)
(for-each (match-lambda
(((and (or 'left-stick 'right-stick) button)
p released pressed)
(let ((pressed? (controller-button-pressed? controller
button))
(x (controller-axis controller
(if (eq? button 'left-stick)
'left-x
'right-x)))
(y (controller-axis controller
(if (eq? button 'left-stick)
'left-y
'right-y))))
(sprite-batch-add! batch p
#:texture-region (texture-atlas-ref atlas released))
(when (or pressed? (not (zero? x)) (not (zero? y)))
(sprite-batch-add!
batch
(vec2+ p (vec2 (* x 16.0) (* y -16.0)))
#:texture-region (texture-atlas-ref atlas pressed)))))
((button p released pressed)
(let ((pressed? (controller-button-pressed? controller
button)))
(sprite-batch-add!
batch p
#:texture-region
(texture-atlas-ref atlas
(if pressed? pressed released))))))
button-icons)
(draw-sprite-batch batch))
(draw-text no-controller-msg no-controller-msg-pos)))
(run-game #:load load #:draw draw #:controller-add controller-add)
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