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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:
+;;
+;; Keyboard input.
+;;
+;;; Code:
+
+(define-module (sdl2 input keyboard)
+ #:use-module (ice-9 hash-table)
+ #:use-module (ice-9 match)
+ #:use-module (srfi srfi-4)
+ #:use-module (system foreign)
+ #:use-module ((sdl2 bindings) #:prefix ffi:)
+ #:export (key-pressed?
+ key-released?))
+
+(define scancode-map
+ (alist->hashq-table
+ `((unknown . ,ffi:SDL_SCANCODE_UNKNOWN)
+ (a . ,ffi:SDL_SCANCODE_A)
+ (b . ,ffi:SDL_SCANCODE_B)
+ (c . ,ffi:SDL_SCANCODE_C)
+ (d . ,ffi:SDL_SCANCODE_D)
+ (e . ,ffi:SDL_SCANCODE_E)
+ (f . ,ffi:SDL_SCANCODE_F)
+ (g . ,ffi:SDL_SCANCODE_G)
+ (h . ,ffi:SDL_SCANCODE_H)
+ (i . ,ffi:SDL_SCANCODE_I)
+ (j . ,ffi:SDL_SCANCODE_J)
+ (k . ,ffi:SDL_SCANCODE_K)
+ (l . ,ffi:SDL_SCANCODE_L)
+ (m . ,ffi:SDL_SCANCODE_M)
+ (n . ,ffi:SDL_SCANCODE_N)
+ (o . ,ffi:SDL_SCANCODE_O)
+ (p . ,ffi:SDL_SCANCODE_P)
+ (q . ,ffi:SDL_SCANCODE_Q)
+ (r . ,ffi:SDL_SCANCODE_R)
+ (s . ,ffi:SDL_SCANCODE_S)
+ (t . ,ffi:SDL_SCANCODE_T)
+ (u . ,ffi:SDL_SCANCODE_U)
+ (v . ,ffi:SDL_SCANCODE_V)
+ (w . ,ffi:SDL_SCANCODE_W)
+ (x . ,ffi:SDL_SCANCODE_X)
+ (y . ,ffi:SDL_SCANCODE_Y)
+ (z . ,ffi:SDL_SCANCODE_Z)
+ (1 . ,ffi:SDL_SCANCODE_1)
+ (2 . ,ffi:SDL_SCANCODE_2)
+ (3 . ,ffi:SDL_SCANCODE_3)
+ (4 . ,ffi:SDL_SCANCODE_4)
+ (5 . ,ffi:SDL_SCANCODE_5)
+ (6 . ,ffi:SDL_SCANCODE_6)
+ (7 . ,ffi:SDL_SCANCODE_7)
+ (8 . ,ffi:SDL_SCANCODE_8)
+ (9 . ,ffi:SDL_SCANCODE_9)
+ (0 . ,ffi:SDL_SCANCODE_0)
+ (return . ,ffi:SDL_SCANCODE_RETURN)
+ (escape . ,ffi:SDL_SCANCODE_ESCAPE)
+ (backspace . ,ffi:SDL_SCANCODE_BACKSPACE)
+ (tab . ,ffi:SDL_SCANCODE_TAB)
+ (space . ,ffi:SDL_SCANCODE_SPACE)
+ (minus . ,ffi:SDL_SCANCODE_MINUS)
+ (equals . ,ffi:SDL_SCANCODE_EQUALS)
+ (left-bracket . ,ffi:SDL_SCANCODE_LEFTBRACKET)
+ (right-bracket . ,ffi:SDL_SCANCODE_RIGHTBRACKET)
+ (backslash . ,ffi:SDL_SCANCODE_BACKSLASH)
+ (nonushash . ,ffi:SDL_SCANCODE_NONUSHASH)
+ (semicolon . ,ffi:SDL_SCANCODE_SEMICOLON)
+ (apostrophe . ,ffi:SDL_SCANCODE_APOSTROPHE)
+ (grave . ,ffi:SDL_SCANCODE_GRAVE)
+ (comma . ,ffi:SDL_SCANCODE_COMMA)
+ (period . ,ffi:SDL_SCANCODE_PERIOD)
+ (slash . ,ffi:SDL_SCANCODE_SLASH)
+ (caps-lock . ,ffi:SDL_SCANCODE_CAPSLOCK)
+ (f1 . ,ffi:SDL_SCANCODE_F1)
+ (f2 . ,ffi:SDL_SCANCODE_F2)
+ (f3 . ,ffi:SDL_SCANCODE_F3)
+ (f4 . ,ffi:SDL_SCANCODE_F4)
+ (f5 . ,ffi:SDL_SCANCODE_F5)
+ (f6 . ,ffi:SDL_SCANCODE_F6)
+ (f7 . ,ffi:SDL_SCANCODE_F7)
+ (f8 . ,ffi:SDL_SCANCODE_F8)
+ (f9 . ,ffi:SDL_SCANCODE_F9)
+ (f10 . ,ffi:SDL_SCANCODE_F10)
+ (f11 . ,ffi:SDL_SCANCODE_F11)
+ (f12 . ,ffi:SDL_SCANCODE_F12)
+ (print-screen . ,ffi:SDL_SCANCODE_PRINTSCREEN)
+ (scroll-lock . ,ffi:SDL_SCANCODE_SCROLLLOCK)
+ (pause . ,ffi:SDL_SCANCODE_PAUSE)
+ (insert . ,ffi:SDL_SCANCODE_INSERT)
+ (home . ,ffi:SDL_SCANCODE_HOME)
+ (page-up . ,ffi:SDL_SCANCODE_PAGEUP)
+ (delete . ,ffi:SDL_SCANCODE_DELETE)
+ (end . ,ffi:SDL_SCANCODE_END)
+ (page-down . ,ffi:SDL_SCANCODE_PAGEDOWN)
+ (right . ,ffi:SDL_SCANCODE_RIGHT)
+ (left . ,ffi:SDL_SCANCODE_LEFT)
+ (down . ,ffi:SDL_SCANCODE_DOWN)
+ (up . ,ffi:SDL_SCANCODE_UP)
+ (num-lock-clear . ,ffi:SDL_SCANCODE_NUMLOCKCLEAR)
+ (keypad-divide . ,ffi:SDL_SCANCODE_KP_DIVIDE)
+ (keypad-multiply . ,ffi:SDL_SCANCODE_KP_MULTIPLY)
+ (keypad-minus . ,ffi:SDL_SCANCODE_KP_MINUS)
+ (keypad-plus . ,ffi:SDL_SCANCODE_KP_PLUS)
+ (keypad-enter . ,ffi:SDL_SCANCODE_KP_ENTER)
+ (keypad-1 . ,ffi:SDL_SCANCODE_KP_1)
+ (keypad-2 . ,ffi:SDL_SCANCODE_KP_2)
+ (keypad-3 . ,ffi:SDL_SCANCODE_KP_3)
+ (keypad-4 . ,ffi:SDL_SCANCODE_KP_4)
+ (keypad-5 . ,ffi:SDL_SCANCODE_KP_5)
+ (keypad-6 . ,ffi:SDL_SCANCODE_KP_6)
+ (keypad-7 . ,ffi:SDL_SCANCODE_KP_7)
+ (keypad-8 . ,ffi:SDL_SCANCODE_KP_8)
+ (keypad-9 . ,ffi:SDL_SCANCODE_KP_9)
+ (keypad-0 . ,ffi:SDL_SCANCODE_KP_0)
+ (keypad-period . ,ffi:SDL_SCANCODE_KP_PERIOD)
+ (nonusbackslash . ,ffi:SDL_SCANCODE_NONUSBACKSLASH)
+ (application . ,ffi:SDL_SCANCODE_APPLICATION)
+ (power . ,ffi:SDL_SCANCODE_POWER)
+ (keypad-equals . ,ffi:SDL_SCANCODE_KP_EQUALS)
+ (f13 . ,ffi:SDL_SCANCODE_F13)
+ (f14 . ,ffi:SDL_SCANCODE_F14)
+ (f15 . ,ffi:SDL_SCANCODE_F15)
+ (f16 . ,ffi:SDL_SCANCODE_F16)
+ (f17 . ,ffi:SDL_SCANCODE_F17)
+ (f18 . ,ffi:SDL_SCANCODE_F18)
+ (f19 . ,ffi:SDL_SCANCODE_F19)
+ (f20 . ,ffi:SDL_SCANCODE_F20)
+ (f21 . ,ffi:SDL_SCANCODE_F21)
+ (f22 . ,ffi:SDL_SCANCODE_F22)
+ (f23 . ,ffi:SDL_SCANCODE_F23)
+ (f24 . ,ffi:SDL_SCANCODE_F24)
+ (execute . ,ffi:SDL_SCANCODE_EXECUTE)
+ (help . ,ffi:SDL_SCANCODE_HELP)
+ (menu . ,ffi:SDL_SCANCODE_MENU)
+ (select . ,ffi:SDL_SCANCODE_SELECT)
+ (stop . ,ffi:SDL_SCANCODE_STOP)
+ (again . ,ffi:SDL_SCANCODE_AGAIN)
+ (undo . ,ffi:SDL_SCANCODE_UNDO)
+ (cut . ,ffi:SDL_SCANCODE_CUT)
+ (copy . ,ffi:SDL_SCANCODE_COPY)
+ (paste . ,ffi:SDL_SCANCODE_PASTE)
+ (find . ,ffi:SDL_SCANCODE_FIND)
+ (mute . ,ffi:SDL_SCANCODE_MUTE)
+ (volume-up . ,ffi:SDL_SCANCODE_VOLUMEUP)
+ (volume-down . ,ffi:SDL_SCANCODE_VOLUMEDOWN)
+ (keypad-comma . ,ffi:SDL_SCANCODE_KP_COMMA)
+ (keypad-equalsas400 . ,ffi:SDL_SCANCODE_KP_EQUALSAS400)
+ (international-1 . ,ffi:SDL_SCANCODE_INTERNATIONAL1)
+ (international-2 . ,ffi:SDL_SCANCODE_INTERNATIONAL2)
+ (international-3 . ,ffi:SDL_SCANCODE_INTERNATIONAL3)
+ (international-4 . ,ffi:SDL_SCANCODE_INTERNATIONAL4)
+ (international-5 . ,ffi:SDL_SCANCODE_INTERNATIONAL5)
+ (international-6 . ,ffi:SDL_SCANCODE_INTERNATIONAL6)
+ (international-7 . ,ffi:SDL_SCANCODE_INTERNATIONAL7)
+ (international-8 . ,ffi:SDL_SCANCODE_INTERNATIONAL8)
+ (international-9 . ,ffi:SDL_SCANCODE_INTERNATIONAL9)
+ (lang-1 . ,ffi:SDL_SCANCODE_LANG1)
+ (lang-2 . ,ffi:SDL_SCANCODE_LANG2)
+ (lang-3 . ,ffi:SDL_SCANCODE_LANG3)
+ (lang-4 . ,ffi:SDL_SCANCODE_LANG4)
+ (lang-5 . ,ffi:SDL_SCANCODE_LANG5)
+ (lang-6 . ,ffi:SDL_SCANCODE_LANG6)
+ (lang-7 . ,ffi:SDL_SCANCODE_LANG7)
+ (lang-8 . ,ffi:SDL_SCANCODE_LANG8)
+ (lang-9 . ,ffi:SDL_SCANCODE_LANG9)
+ (alt-erase . ,ffi:SDL_SCANCODE_ALTERASE)
+ (sysreq . ,ffi:SDL_SCANCODE_SYSREQ)
+ (cancel . ,ffi:SDL_SCANCODE_CANCEL)
+ (clear . ,ffi:SDL_SCANCODE_CLEAR)
+ (prior . ,ffi:SDL_SCANCODE_PRIOR)
+ (return-2 . ,ffi:SDL_SCANCODE_RETURN2)
+ (separator . ,ffi:SDL_SCANCODE_SEPARATOR)
+ (out . ,ffi:SDL_SCANCODE_OUT)
+ (oper . ,ffi:SDL_SCANCODE_OPER)
+ (clear-again . ,ffi:SDL_SCANCODE_CLEARAGAIN)
+ (crsel . ,ffi:SDL_SCANCODE_CRSEL)
+ (exsel . ,ffi:SDL_SCANCODE_EXSEL)
+ (keypad-00 . ,ffi:SDL_SCANCODE_KP_00)
+ (keypad-000 . ,ffi:SDL_SCANCODE_KP_000)
+ (thousands-separator . ,ffi:SDL_SCANCODE_THOUSANDSSEPARATOR)
+ (decimal-separator . ,ffi:SDL_SCANCODE_DECIMALSEPARATOR)
+ (currency-unit . ,ffi:SDL_SCANCODE_CURRENCYUNIT)
+ (current-subunit . ,ffi:SDL_SCANCODE_CURRENCYSUBUNIT)
+ (keypad-left-paren . ,ffi:SDL_SCANCODE_KP_LEFTPAREN)
+ (keypad-right-paren . ,ffi:SDL_SCANCODE_KP_RIGHTPAREN)
+ (keypad-left-brace . ,ffi:SDL_SCANCODE_KP_LEFTBRACE)
+ (keypad-right-brace . ,ffi:SDL_SCANCODE_KP_RIGHTBRACE)
+ (keypad-tab . ,ffi:SDL_SCANCODE_KP_TAB)
+ (keypad-backspace . ,ffi:SDL_SCANCODE_KP_BACKSPACE)
+ (keypad-a . ,ffi:SDL_SCANCODE_KP_A)
+ (keypad-b . ,ffi:SDL_SCANCODE_KP_B)
+ (keypad-c . ,ffi:SDL_SCANCODE_KP_C)
+ (keypad-d . ,ffi:SDL_SCANCODE_KP_D)
+ (keypad-e . ,ffi:SDL_SCANCODE_KP_E)
+ (keypad-f . ,ffi:SDL_SCANCODE_KP_F)
+ (keypad-xor . ,ffi:SDL_SCANCODE_KP_XOR)
+ (keypad-power . ,ffi:SDL_SCANCODE_KP_POWER)
+ (keypad-percent . ,ffi:SDL_SCANCODE_KP_PERCENT)
+ (keypad-less . ,ffi:SDL_SCANCODE_KP_LESS)
+ (keypad-greater . ,ffi:SDL_SCANCODE_KP_GREATER)
+ (keypad-ampersand . ,ffi:SDL_SCANCODE_KP_AMPERSAND)
+ (keypad-double-ampersand . ,ffi:SDL_SCANCODE_KP_DBLAMPERSAND)
+ (keypad-vertical-bar . ,ffi:SDL_SCANCODE_KP_VERTICALBAR)
+ (keypad-double-vertical-bar . ,ffi:SDL_SCANCODE_KP_DBLVERTICALBAR)
+ (keypad-colon . ,ffi:SDL_SCANCODE_KP_COLON)
+ (keypad-hash . ,ffi:SDL_SCANCODE_KP_HASH)
+ (keypad-space . ,ffi:SDL_SCANCODE_KP_SPACE)
+ (keypad-at . ,ffi:SDL_SCANCODE_KP_AT)
+ (keypad-exclam . ,ffi:SDL_SCANCODE_KP_EXCLAM)
+ (keypad-mem-store . ,ffi:SDL_SCANCODE_KP_MEMSTORE)
+ (keypad-mem-recall . ,ffi:SDL_SCANCODE_KP_MEMRECALL)
+ (keypad-mem-clear . ,ffi:SDL_SCANCODE_KP_MEMCLEAR)
+ (keypad-mem-add . ,ffi:SDL_SCANCODE_KP_MEMADD)
+ (keypadd-mem-subtract . ,ffi:SDL_SCANCODE_KP_MEMSUBTRACT)
+ (keypad-mem-multiply . ,ffi:SDL_SCANCODE_KP_MEMMULTIPLY)
+ (keypad-mem-divide . ,ffi:SDL_SCANCODE_KP_MEMDIVIDE)
+ (keypad-plus-minus . ,ffi:SDL_SCANCODE_KP_PLUSMINUS)
+ (keypad-clear . ,ffi:SDL_SCANCODE_KP_CLEAR)
+ (keypad-clear-entry . ,ffi:SDL_SCANCODE_KP_CLEARENTRY)
+ (keypad-binary . ,ffi:SDL_SCANCODE_KP_BINARY)
+ (keypad-octal . ,ffi:SDL_SCANCODE_KP_OCTAL)
+ (keypad-decimal . ,ffi:SDL_SCANCODE_KP_DECIMAL)
+ (keypad-hexadecimal . ,ffi:SDL_SCANCODE_KP_HEXADECIMAL)
+ (left-control . ,ffi:SDL_SCANCODE_LCTRL)
+ (left-shift . ,ffi:SDL_SCANCODE_LSHIFT)
+ (left-alt . ,ffi:SDL_SCANCODE_LALT)
+ (left-gui . ,ffi:SDL_SCANCODE_LGUI)
+ (right-control . ,ffi:SDL_SCANCODE_RCTRL)
+ (right-shift . ,ffi:SDL_SCANCODE_RSHIFT)
+ (right-alt . ,ffi:SDL_SCANCODE_RALT)
+ (right-cui . ,ffi:SDL_SCANCODE_RGUI)
+ (mode . ,ffi:SDL_SCANCODE_MODE)
+ (audio-next . ,ffi:SDL_SCANCODE_AUDIONEXT)
+ (audio-prev . ,ffi:SDL_SCANCODE_AUDIOPREV)
+ (audio-stop . ,ffi:SDL_SCANCODE_AUDIOSTOP)
+ (audio-play . ,ffi:SDL_SCANCODE_AUDIOPLAY)
+ (audio-mute . ,ffi:SDL_SCANCODE_AUDIOMUTE)
+ (media-select . ,ffi:SDL_SCANCODE_MEDIASELECT)
+ (www . ,ffi:SDL_SCANCODE_WWW)
+ (mail . ,ffi:SDL_SCANCODE_MAIL)
+ (calculator . ,ffi:SDL_SCANCODE_CALCULATOR)
+ (computer . ,ffi:SDL_SCANCODE_COMPUTER)
+ (ac-search . ,ffi:SDL_SCANCODE_AC_SEARCH)
+ (ac-home . ,ffi:SDL_SCANCODE_AC_HOME)
+ (ac-back . ,ffi:SDL_SCANCODE_AC_BACK)
+ (ac-forward . ,ffi:SDL_SCANCODE_AC_FORWARD)
+ (ac-stop . ,ffi:SDL_SCANCODE_AC_STOP)
+ (ac-refresh . ,ffi:SDL_SCANCODE_AC_REFRESH)
+ (ac-bookmarks . ,ffi:SDL_SCANCODE_AC_BOOKMARKS)
+ (brightness-down . ,ffi:SDL_SCANCODE_BRIGHTNESSDOWN)
+ (brightness-up . ,ffi:SDL_SCANCODE_BRIGHTNESSUP)
+ (display-switch . ,ffi:SDL_SCANCODE_DISPLAYSWITCH)
+ (keyboard-illum-toggle . ,ffi:SDL_SCANCODE_KBDILLUMTOGGLE)
+ (keyboard-illum-down . ,ffi:SDL_SCANCODE_KBDILLUMDOWN)
+ (keyboard-illum-up . ,ffi:SDL_SCANCODE_KBDILLUMUP)
+ (eject . ,ffi:SDL_SCANCODE_EJECT)
+ (sleep . ,ffi:SDL_SCANCODE_SLEEP)
+ (app-1 . ,ffi:SDL_SCANCODE_APP1)
+ (app-2 . ,ffi:SDL_SCANCODE_APP2))))
+
+(define key-pressed?
+ (let ((keystate (pointer->bytevector
+ (ffi:sdl-get-keyboard-state %null-pointer)
+ ffi:SDL_NUM_SCANCODES)))
+ (lambda (key)
+ "Return #t if KEY is currently being pressed."
+ (= 1 (u8vector-ref keystate (hashq-ref scancode-map key))))))
+
+(define (key-released? key)
+ "Return #t if KEY is not currently being pressed."
+ (not (key-pressed? key)))