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(use-modules (chickadee)
(chickadee math)
(chickadee math matrix)
(chickadee math vector)
(chickadee graphics engine)
(chickadee graphics model)
(chickadee graphics font)
(ice-9 format))
(define projection (perspective-projection (/ pi 3) (/ 4.0 3.0) 0.1 500.0))
(define translation (make-identity-matrix4))
(define view-matrix (make-identity-matrix4))
(define model-matrix (make-identity-matrix4))
(define position (vec3 0.0 0.0 0.0))
(define velocity (vec3 0.0 0.0 0.0))
(define model #f)
(define text-position #v(4.0 464.0))
(define text "")
(define y-rotation 0.0)
(define (reset-position)
(set-vec3! position 0.0 0.0 -4.0))
(define (load)
(set! model (load-obj "models/suzanne.obj"))
(reset-position))
(define (draw alpha)
(with-projection projection
(draw-model model model-matrix view-matrix position))
(draw-text text text-position))
(define (update dt)
;; Update camera position
(set-vec3! velocity
(+ (if (key-pressed? 'd) -1.0 0.0)
(if (key-pressed? 'a) 1.0 0.0))
0.0
(+ (if (key-pressed? 's) -1.0 0.0)
(if (key-pressed? 'w) 1.0 0.0)))
(vec3-normalize! velocity)
(vec3-mult! velocity 0.1)
(vec3-add! position velocity)
(set! text (format #f "(~6,2f, ~6,2f, ~6,2f)"
(vec3-x position)
(vec3-y position)
(vec3-z position)))
;; Compute new view matrix
(matrix4-translate! translation position)
(matrix4-identity! view-matrix)
(matrix4-mult! view-matrix view-matrix translation)
;; Rotate the model about the y-axis
(set! y-rotation (+ y-rotation 0.03))
(matrix4-rotate-y! model-matrix y-rotation))
(define (key-press key modifiers repeat?)
(cond
((eq? key 'q)
(abort-game))
((eq? key 'r)
(reset-position))))
(run-game #:window-title "3D!"
#:load load
#:draw draw
#:update update
#:key-press key-press)
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