AC_INIT(configure.in)
AC_CANONICAL_SYSTEM
AM_INIT_AUTOMAKE(antigrav, 0.0.2)

AC_CONFIG_HEADERS(config.h)

AC_PROG_CC
AC_PROG_CXX
AC_PROG_INSTALL
AC_PROG_RANLIB

AC_LANG_CPLUSPLUS

AC_STDC_HEADERS
AC_HEADER_DIRENT

AC_SUBST(datadir)
AC_SUBST(PACKAGE)

case "$target" in
  *-*-cygwin* | *-*-mingw32*)
    MATHLIB=""
    SYS_GL_LIBS="-lopengl32 -lglu32"
    ;;
  *)
    MATHLIB="-lm"
      SYS_GL_LIBS="-lGL -lGLU"
    ;;
esac

dnl Check for openal
AC_CHECK_LIB(openal, alGenSources,,AC_MSG_ERROR([*** OpenAL is required ***]),-lz)

dnl Check for alut
AC_CHECK_LIB(alut, alutInit,,AC_MSG_ERROR([*** ALUT is required ***]),-lz)

dnl Check for libpng
AC_CHECK_LIB(png, png_create_read_struct,,AC_MSG_ERROR([*** libpng is required ***]),-lz)

AC_ARG_ENABLE([debug],
	[  --enable-debug	enable debugging features],
	[debug=$enableval],
	[debug=no])

dnl AC_DEFINE_UNQUOTED([DEBUG],[],[Debugging]))
dnl Check for SDL2
AM_PATH_SDL2(2.0.0,,AC_MSG_ERROR([*** SDL >= 2.0.0 not found ***]))

HAVE_OPENGL=no
AC_CHECK_HEADER(GL/gl.h,HAVE_OPENGL=yes,AC_MSG_ERROR([*** OpenGL not found ***]))
LIBS="$LIBS $SYS_GL_LIBS"

if test "x$debug" = "xyes"
then
	AC_DEFINE_UNQUOTED([DEBUG],[],[Debugging])
	CXXFLAGS="$CXXFLAGS $SDL_CFLAGS -g"
else
	CXXFLAGS="$CXXFLAGS $SDL_CFLAGS"
fi

CFLAGS="$CXXFLAGS"
LIBS="$LIBS -lSDL2"

AC_OUTPUT(Makefile src/Makefile src/tinyxml/Makefile data/Makefile extra/Makefile)