;;; Sly
;;; Copyright (C) 2014 Jordan Russell <jordan.likes.curry@gmail.com>
;;; Copyright (C) 2015 David Thompson <davet@gnu.org>
;;;
;;; 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 example code.
;;
;;; Code:

(use-modules (sly game)
             (sly signal)
             (sly window)
             (sly math rect)
             (sly math vector)
             (sly input joystick)
             (sly render)
             (sly render camera)
             (sly render sprite)
             (sly render texture)
             (sly render font))

(load "common.scm")

(enable-joystick)
(enable-fonts)

(define font (load-default-font 18))

(define resolution (vector2 640 480))

(define player-texture
  (load-texture "images/p1_front.png"))

(define player (make-sprite player-texture))

(define-signal player-position
  (signal-fold v+ (vector2 320 240)
               (signal-map (lambda (v) (v* v 8))
                           (signal-sample 1 (make-directional-signal 0 0 1)))))

(define* (button-caption-signal text button #:optional (joystick 0))
  (let ((false-message (format #f "Released button ~d" button)))
    (signal-map (lambda (x) (if x text false-message))
                (button-down? joystick button))))

(define-signal caption
  (signal-map (lambda (text)
                (move (vector2 -76 -90)
                      (render-sprite (make-label font text))))
              (signal-merge
               (make-signal "Press a button")
               (button-caption-signal "Hello there" 0)
               (button-caption-signal "Thanks for pressing button 1" 1)
               (button-caption-signal "This is the other caption" 2)
               (button-caption-signal "This is the other other caption" 3))))

(define-signal view
  (signal-let ((position player-position)
               (caption caption))
    (move position
          (render-begin
           (render-sprite player)
           caption))))

(define camera
  (2d-camera #:area (make-rect (vector2 0 0) resolution)))

(define-signal scene
  (signal-let ((view view))
    (with-camera camera view)))

(add-hook! joystick-axis-hook
           (lambda (which axis value)
             (format #t "joystick: ~d axis: ~d raw-value: ~d value: ~f~%"
                     which axis value (axis-scale value))))

(add-hook! joystick-button-press-hook
           (lambda (which button)
             (format #t "button-press: (joystick: ~d button: ~d)~%"
                     which button)))

(add-hook! joystick-button-release-hook
           (lambda (which button)
             (format #t "button-release: (joystick: ~d button: ~d)~%"
                     which button)))

(with-window (make-window #:title "Joystick test"
                          #:resolution resolution)
             (run-game-loop scene))

;;; Local Variables:
;;; compile-command: "../pre-inst-env guile joystick.scm"
;;; End: