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;;; guile-sdl2 --- FFI bindings for SDL2
;;; Copyright © 2015 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:
;;
;; SDL display and window management functions.
;;
;;; Code:
(define-module (sdl2 video)
#:use-module (ice-9 format)
#:use-module (ice-9 match)
#:use-module (rnrs bytevectors)
#:use-module (srfi srfi-4)
#:use-module (system foreign)
#:use-module ((sdl2 bindings) #:prefix ffi:)
#:use-module (sdl2)
#:export (window?
make-window
close-window!
call-with-window
window-title
window-size
window-position
window-id
id->window
hide-window!
show-window!
maximize-window!
minimize-window!
raise-window!
restore-window!
set-window-border!
set-window-title!
set-window-position!
set-window-size!
make-gl-context
gl-context?
delete-gl-context!
call-with-gl-context
swap-gl-window))
;;;
;;; Windows
;;;
(define-wrapped-pointer-type <window>
window?
wrap-window unwrap-window
(lambda (window port)
(format port "#<window id: ~s title: ~s size: ~s position: ~s>"
(window-id window)
(window-title window)
(window-size window)
(window-position window))))
(define* (make-window #:key (title "Guile SDL2 Window")
(position '(#f #f)) (size '(640 480))
(maximize? #f) (minimize? #f)
(show? #t) (resizable? #f)
(opengl? #f) (border? #t)
(fullscreen? #f) (fullscreen-desktop? #f)
(grab-input? #f) (high-dpi? #f))
"Create a new window named TITLE with dimensions SIZE located at
POSITION on the display. POSITION and SIZE are two-element lists in
the form '(x y)', where each coordinate is measured in pixels. In the
case of POSITION, a coordinate may use the special symbol 'center' to
indicate that the window should be centered on that axis, or #f to
indicate that it does not matter where the window is located on that
axis."
(define coord->int
(match-lambda
(#f ffi:SDL_WINDOWPOS_UNDEFINED)
('center ffi:SDL_WINDOWPOS_CENTERED)
(n n)))
(define x (match-lambda ((x _) x)))
(define y (match-lambda ((_ y) y)))
(let* ((flags (logior (if fullscreen?
ffi:SDL_WINDOW_FULLSCREEN
0)
(if fullscreen-desktop?
ffi:SDL_WINDOW_FULLSCREEN_DESKTOP
0)
(if opengl?
ffi:SDL_WINDOW_OPENGL
0)
(if show?
0
ffi:SDL_WINDOW_HIDDEN)
(if border?
0
ffi:SDL_WINDOW_BORDERLESS)
(if resizable?
ffi:SDL_WINDOW_RESIZABLE
0)
(if minimize?
ffi:SDL_WINDOW_MINIMIZED
0)
(if maximize?
ffi:SDL_WINDOW_MAXIMIZED
0)
(if grab-input?
ffi:SDL_WINDOW_INPUT_GRABBED
0)
(if high-dpi?
ffi:SDL_WINDOW_ALLOW_HIGHDPI
0)))
(ptr (ffi:sdl-create-window (string->pointer title)
(coord->int (x position))
(coord->int (y position))
(x size)
(y size)
flags)))
(if (null-pointer? ptr)
(sdl-error "make-window" "failed to create window")
(wrap-window ptr))))
(define (close-window! window)
"Close WINDOW."
(ffi:sdl-destroy-window (unwrap-window window)))
(define (call-with-window window proc)
"Call PROC with WINDOW, an SDL window object, and close it when PROC
returns or otherwise exits."
(dynamic-wind
(const #t)
(lambda () (proc window))
(lambda ()
(close-window! window))))
(define (window-title window)
"Return the title for WINDOW."
(pointer->string (ffi:sdl-get-window-title (unwrap-window window))))
(define (%get-coords window proc)
(let ((bv (make-bytevector (* 2 (sizeof int)) 0)))
(proc (unwrap-window window)
(bytevector->pointer bv)
(bytevector->pointer bv (sizeof int)))
(bytevector->sint-list bv (native-endianness) (sizeof int))))
(define (window-size window)
"Return the dimensions of WINDOW."
(%get-coords window ffi:sdl-get-window-size))
(define (window-position window)
"Return the position of WINDOW on the display."
(%get-coords window ffi:sdl-get-window-position))
(define (window-id window)
"Return the numeric ID of WINDOW."
(ffi:sdl-get-window-id (unwrap-window window)))
(define (id->window id)
"Return the window corresponding to ID, a positive integer, or #f if
there is no such window."
(let ((ptr (ffi:sdl-get-window-from-id id)))
(if (null-pointer? ptr)
#f
(wrap-window ptr))))
(define (hide-window! window)
"Hide WINDOW."
(ffi:sdl-hide-window (unwrap-window window)))
(define (show-window! window)
"Show WINDOW and focus on it."
(ffi:sdl-show-window (unwrap-window window)))
(define (maximize-window! window)
"Make WINDOW as large as possible."
(ffi:sdl-maximize-window (unwrap-window window)))
(define (minimize-window! window)
"Shrink WINDOW to an iconic representation."
(ffi:sdl-minimize-window (unwrap-window window)))
(define (raise-window! window)
"Raise WINDOW above all other windows and set input focus."
(ffi:sdl-raise-window (unwrap-window window)))
(define (restore-window! window)
"Restore the size and position of a minimized or maximized WINDOW."
(ffi:sdl-restore-window (unwrap-window window)))
(define (set-window-border! window border?)
"When BORDER?, draw the usual border around WINDOW, otherwise remove
the border."
(ffi:sdl-set-window-bordered (unwrap-window window)
(ffi:boolean->sdl-bool border?)))
(define (set-window-title! window title)
"Set the title of WINDOW to the string TITLE."
(ffi:sdl-set-window-title (unwrap-window window)
(string->pointer title)))
(define (set-window-position! window position)
"Set the position of WINDOW to POSITION, a two-element list of (x,y)
coordinates measured in pixels."
(match position
((x y)
(ffi:sdl-set-window-position (unwrap-window window) x y))))
(define (set-window-size! window size)
"Set the dimensions of WINDOW to SIZE, a two-element list
of (width,height) coordinates measured in pixels."
(match size
((width height)
(ffi:sdl-set-window-size (unwrap-window window) width height))))
;;;
;;; OpenGL
;;;
(define-wrapped-pointer-type <gl-context>
gl-context?
wrap-gl-context unwrap-gl-context
(lambda (context port)
(format port "#<gl-context ~x>"
(pointer-address (unwrap-gl-context context)))))
(define (make-gl-context window)
"Create an OpenGL context for WINDOW."
(let ((ptr (ffi:sdl-gl-create-context (unwrap-window window))))
(if (null-pointer? ptr)
(sdl-error "make-gl-context" "failed to create OpenGL context")
(wrap-gl-context ptr))))
(define (delete-gl-context! context)
"Delete CONTEXT, an OpenGL context object."
(ffi:sdl-gl-delete-context (unwrap-gl-context context)))
(define (call-with-gl-context window proc)
"Call PROC with a new OpenGL context created for WINDOW, and close
the context when PROC returns or otherwise exits.."
(let ((context (make-gl-context window)))
(dynamic-wind
(const #t)
(lambda () (proc context))
(lambda ()
(delete-gl-context! context)))))
(define (swap-gl-window window)
"Update WINDOW with OpenGL rendering."
(ffi:sdl-gl-swap-window (unwrap-window window)))
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