(define-module (sdl2 config)
  #:use-module (ice-9 match)
  #:use-module (system foreign)
  #:export (dynamic-link*
            %libsdl2
            %libsdl2-image
            %libsdl2-ttf
            %libsdl2-mixer))

;; Try to link against multiple library possibilities, such as the
;; absolute file name discovered by ./configure or by searching the
;; library load path as a fallback method.  Useful when restributing
;; relocatable builds.
(define (dynamic-link* names)
  (let loop ((names names))
    (match names
      (()
       (error "could not find library" names))
      ((name . rest)
       (or (false-if-exception (dynamic-link name))
           (loop rest))))))

;; Special case Windows since the DLL names are different.  Performing
;; this check at runtime allows a Linux machine to cross-compile
;; guile-sdl2 for a Windows target.
(define %windows? (string-prefix? "Windows" (utsname:sysname (uname))))
(define %libsdl2
  (if %windows?
      '("SDL2")
      '("@SDL2_LIBDIR@/libSDL2" "libSDL2")))
(define %libsdl2-image
  (if %windows?
      '("SDL2_image")
      '("@SDL2_IMAGE_LIBDIR@/libSDL2_image" "libSDL2_image")))
(define %libsdl2-ttf
  (if %windows?
      '("SDL2_ttf")
      '("@SDL2_TTF_LIBDIR@/libSDL2_ttf" "libSDL2_ttf")))
(define %libsdl2-mixer
  (if %windows?
      '("SDL2_mixer")
      '("@SDL2_MIXER_LIBDIR@/libSDL2_mixer" "libSDL2_mixer")))