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;;; guile-2d
;;; Copyright (C) 2013, 2014 David Thompson <dthompson2@worcester.edu>
;;;
;;; 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:
;;
;; Window management.
;;
;;; Code:
(define-module (2d window)
#:use-module (srfi srfi-9)
#:use-module (gl)
#:use-module ((sdl sdl) #:prefix SDL:)
#:use-module ((sdl mixer) #:prefix SDL:)
#:use-module (2d event)
#:use-module (2d signal)
#:use-module (2d transform)
#:use-module (2d vector2)
#:export (make-window
window?
window-title
window-resolution
window-fullscreen?
window-width
window-height
window-size
window-projection
open-window
close-window
with-window
window-resize-hook
window-close-hook))
(define-record-type <window>
(%make-window title resolution fullscreen?)
window?
(title window-title)
(resolution window-resolution)
(fullscreen? window-fullscreen?))
(define* (make-window #:optional #:key
(title "Guile-2D Window")
(resolution (vector2 640 480))
(fullscreen? #f))
(%make-window title resolution fullscreen?))
(define window-resize-hook (make-hook 2))
(register-event-handler
'video-resize
(lambda (e)
(run-hook window-resize-hook
(SDL:event:resize:w e)
(SDL:event:resize:h e))))
(define-signal window-size
(hook->signal window-resize-hook
null-vector2
(lambda (width height)
(vector2 width height))))
(define-signal window-width (signal-map vx window-size))
(define-signal window-height (signal-map vy window-size))
(define-signal window-projection
(signal-map (lambda (size)
(if (or (zero? (vx size)) (zero? (vy size)))
identity-transform
(orthographic-projection 0 (vx size) 0 (vy size) -1 1)))
window-size))
(define window-close-hook (make-hook))
(register-event-handler
'quit
(lambda (e)
(run-hook window-close-hook)))
(define* (open-window window)
"Open the game window using the settings in WINDOW."
(let ((flags (if (window-fullscreen? window) '(opengl fullscreen) 'opengl))
(width (vx (window-resolution window)))
(height (vy (window-resolution window))))
(signal-set! window-size (vector2 width height))
;; Initialize everything
(SDL:enable-unicode #t)
(SDL:init 'everything)
;; Open SDL window in OpenGL mode.
(SDL:set-video-mode width height 24 flags)
(SDL:set-caption (window-title window))
;; Enable texturing and alpha blending
(gl-enable (enable-cap texture-2d))
(gl-enable (enable-cap blend))
(set-gl-blend-function (blending-factor-src src-alpha)
(blending-factor-dest one-minus-src-alpha))))
(define (close-window)
"Close the currently open window and audio."
(SDL:quit))
(define-syntax-rule (with-window window body ...)
(dynamic-wind
(lambda () (open-window window))
(lambda () body ...)
(lambda () (close-window))))
;; Open a window immediately to create an OpenGL context. This allows
;; for textures to be loaded before the program explicitly sets the
;; window settings.
;;
;; TODO: Hide the window initially. This will require SDL 2.0.
(open-window (make-window #:title ""))
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