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;;; guile-sdl2 --- FFI bindings for SDL2
;;; Copyright © 2017 David Thompson <davet@gnu.org>
;;;
;;; This file is part of guile-sdl2.
;;;
;;; Guile-sdl2 is free software; you can redistribute it and/or modify
;;; it under the terms of the GNU Lesser General Public License as
;;; published by the Free Software Foundation; either version 3 of the
;;; License, or (at your option) any later version.
;;;
;;; Guile-sdl2 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 Lesser General Public
;;; License along with guile-sdl2. If not, see
;;; <http://www.gnu.org/licenses/>.
;;; Commentary:
;;
;; Mouse input.
;;
;;; Code:
(define-module (sdl2 input mouse)
#:use-module (ice-9 match)
#:use-module (rnrs bytevectors)
#:use-module (sdl2)
#:use-module ((sdl2 bindings) #:prefix ffi:)
#:use-module (system foreign)
#:export (mouse-x
mouse-y
mouse-button-pressed?
mouse-button-released?))
(define (make-int)
(make-bytevector (sizeof int)))
(define (get-int bv)
(bytevector-sint-ref bv 0 (native-endianness) (sizeof int)))
(define mouse-x
(let* ((bv (make-int))
(ptr (bytevector->pointer bv)))
(lambda ()
"Return the x coordinate of the mouse cursor."
(ffi:sdl-get-mouse-state ptr %null-pointer)
(get-int bv))))
(define mouse-y
(let* ((bv (make-int))
(ptr (bytevector->pointer bv)))
(lambda ()
"Return the y coordinate of the mouse cursor."
(ffi:sdl-get-mouse-state %null-pointer ptr)
(get-int bv))))
(define (mouse-button-pressed? button)
"Return #t if BUTTON is currently being pressed."
(let ((mask (match button
('left ffi:SDL_BUTTON_LMASK)
('middle ffi:SDL_BUTTON_MMASK)
('right ffi:SDL_BUTTON_RMASK)
('x1 ffi:SDL_BUTTON_X1MASK)
('x2 ffi:SDL_BUTTON_X2MASK)))
(buttons (ffi:sdl-get-mouse-state %null-pointer %null-pointer)))
(> (logand mask buttons) 0)))
(define (mouse-button-released? button)
"Return #t if BUTTON is not currently being pressed."
(not (mouse-button-pressed? button)))
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