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authorDavid Thompson <dthompson2@worcester.edu>2015-10-06 22:05:20 -0400
committerDavid Thompson <dthompson2@worcester.edu>2015-10-06 22:05:20 -0400
commit9ce20c40540908cf95dc1546c23df415631cf1e0 (patch)
tree5a7fddd0bc100997d0c8f1e8dbe14465b71f405d /sdl2.scm
Initial commit.
Let's do this!
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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 initialization and error handling.
+;;
+;;; Code:
+
+(define-module (sdl2)
+ #:use-module (ice-9 match)
+ #:use-module (srfi srfi-4)
+ #:use-module (system foreign)
+ #:use-module ((sdl2 bindings) #:prefix ffi:)
+ #:export (sdl-error-string
+ sdl-error
+ sdl-version
+ sdl-init
+ sdl-quit))
+
+(define %default-init-flags
+ '(timer audio video haptic game-controller events))
+
+(define (sdl-error-string)
+ "Return the current SDL error string."
+ (pointer->string (ffi:sdl-get-error)))
+
+(define (sdl-error func message . args)
+ (apply throw 'sdl-error func (string-append message ": ~A")
+ (append args (list (sdl-error-string)))))
+
+(define (sdl-version)
+ "Return a three element list containing the major, minor, and patch
+version of the linked SDL library."
+ (let ((bv (make-u8vector 3)))
+ (ffi:sdl-get-version (bytevector->pointer bv))
+ (u8vector->list bv)))
+
+(define* (sdl-init #:optional (subsystems %default-init-flags))
+ "Initialize the SDL library. This must be called before using any
+other SDL procedure.
+
+SUBSYSTEMS is an optional list of symbols that specifies the
+subsystems to initialize. All subsystems are initialized by default.
+The possible flags are 'timer', 'audio', 'video', 'haptic',
+'game-controller', and 'events'."
+ (let ((flags (apply logior
+ (map (match-lambda
+ ('timer ffi:SDL_INIT_TIMER)
+ ('audio ffi:SDL_INIT_AUDIO)
+ ('video ffi:SDL_INIT_VIDEO)
+ ('haptic ffi:SDL_INIT_HAPTIC)
+ ('game-controller ffi:SDL_INIT_GAMECONTROLLER)
+ ('events ffi:SDL_INIT_EVENTS))
+ subsystems))))
+ (unless (zero? (ffi:sdl-init flags))
+ (sdl-error "sdl-init" "failed to initialize subsystems ~S"
+ subsystems))))
+
+(define (sdl-quit)
+ "Quit all activated SDL subsystems. This procedure should be called
+upon all exit conditions."
+ (ffi:sdl-quit))