Gacela as Guile modules.

[gacela.git] / src / events.scm

diff --git a/src/events.scm b/src/events.scm
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+;;; Gacela, a GNU Guile extension for fast games development
+;;; Copyright (C) 2009 by Javier Sancho Fernandez <jsf at jsancho dot 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/>.
+
+
+(define-module (gacela events)
+  #:use-module (gacela sdl)
+  #:export (process-events
+           quit?
+           key?
+           key-pressed?
+           key-released?))
+
+
+(define (get-event events types)
+  (cond ((null? events) '())
+       (else
+        (let ((res (get-event (cdr events) types))
+              (event (car events)))
+          (cond ((member (assoc-ref event 'type) types) (cons event res))
+                (else res))))))
+
+(define (poll-events)
+  (let ((event (SDL_PollEvent)))
+    (cond ((null? event) '())
+         (else (cons event (poll-events))))))
+
+(define (process-events)
+  (let ((events (poll-events)))
+    (quit! (not (null? (get-event events `(,SDL_QUIT)))))
+    (clear-key-state)
+    (process-keyboard-events (get-event events `(,SDL_KEYDOWN ,SDL_KEYUP)))))
+
+(define quit? #f)
+(define quit! #f)
+
+(let ((quit #f))
+  (set! quit?
+       (lambda ()
+         quit))
+
+  (set! quit!
+       (lambda (value)
+         (set! quit value))))
+
+(define (process-keyboard-events events)
+  (cond ((not (null? events))
+        (let ((event (car events)))
+          (cond ((= (assoc-ref event 'type) SDL_KEYDOWN) (key-press (assoc-ref event 'key.keysym.sym)))
+                ((= (assoc-ref event 'type) SDL_KEYUP) (key-release (assoc-ref event 'key.keysym.sym)))))
+        (process-keyboard-events (cdr events)))))
+
+(define key? #f)
+(define key-pressed? #f)
+(define key-released? #f)
+(define key-press #f)
+(define key-release #f)
+(define clear-keymap #f)
+(define clear-key-state #f)
+
+(let ((keymap (make-hash-table))
+      (pressed (make-hash-table))
+      (released (make-hash-table)))
+  (set! key?
+       (lambda (key)
+         (hash-ref keymap (get-keycode key))))
+
+  (set! key-pressed?
+       (lambda (key)
+         (hash-ref pressed (get-keycode key))))
+
+  (set! key-released?
+       (lambda (key)
+         (hash-ref released (get-keycode key))))
+
+  (set! key-press
+       (lambda (key-code)
+         (hash-set! keymap key-code #t)
+         (hash-set! pressed key-code #t)
+         (hash-set! released key-code #f)))
+
+  (set! key-release
+       (lambda (key-code)
+         (hash-set! keymap key-code #f)
+         (hash-set! pressed key-code #f)
+         (hash-set! released key-code #t)))
+
+  (set! clear-keymap
+       (lambda ()
+         (hash-clear! keymap)))
+
+  (set! clear-key-state
+       (lambda ()
+         (hash-clear! pressed)
+         (hash-clear! released))))
+
+(define get-keycode #f)
+(define get-keyname #f)
+
+(let* ((keys
+       '((8 . backspace)
+         (9 . tab)
+         (12 . clear)
+         (13 . return)
+         (19 . pause)
+         (27 . escape)
+         (32 . space)
+         (33 . exclaim)
+         (34 . quotedbl)
+         (35 . hash)
+         (36 . dollar)
+         (38 . ampersand)
+         (39 . quote)
+         (40 . leftparen)
+         (41 . rightparen)
+         (42 . asterisk)
+         (43 . plus)
+         (44 . comma)
+         (45 . minus)
+         (46 . period)
+         (47 . slash)
+         (48 . 0)
+         (49 . 1)
+         (50 . 2)
+         (51 . 3)
+         (52 . 4)
+         (53 . 5)
+         (54 . 6)
+         (55 . 7)
+         (56 . 8)
+         (57 . 9)
+         (58 . colon)
+         (59 . semicolon)
+         (60 . less)
+         (61 . equals)
+         (62 . greater)
+         (63 . question)
+         (64 . at)
+         (269 . kp-minus)
+         (270 . kp-plus)
+         (273 . up)
+         (274 . down)
+         (275 . right)
+         (276 . left)
+         (282 . f1)
+         (283 . f2)
+         (284 . f3)
+         (285 . f4)
+         (286 . f5)
+         (287 . f6)
+         (288 . f7)
+         (289 . f8)
+         (290 . f9)
+         (291 . f10)
+         (292 . f11)
+         (293 . f12)))
+       (keynames (map (lambda (k) (cons (cdr k) (car k))) keys)))
+
+  (set! get-keycode
+       (lambda (keyname)
+         (assoc-ref keynames keyname)))
+
+  (set! get-keyname
+       (lambda (keycode)
+         (assoc-ref keys keycode))))