# Process this file with autoconf to produce a configure script.
AC_INIT(tenebrae, cvs)

# =================================================================
# Detect the canonical target build environment
AC_CANONICAL_HOST
AC_CANONICAL_TARGET

AM_INIT_AUTOMAKE

# =================================================================
# Checks for sources 
AC_CONFIG_SRCDIR([../sys_sdl.c])
AM_CONFIG_HEADER([config.h])

# =================================================================
# Checks for programs : cc, c++, yacc, install, make, ar
AC_PROG_CC
AC_PROG_CXX
AC_PROG_YACC
AC_PROG_INSTALL
AC_PROG_MAKE_SET
AC_PROG_RANLIB

# =================================================================
# autoconf 2.53 doesn't check that
# AM_PROG_AS
CCAS="$CC"
CCASFLAGS="$CFLAGS -x assembler-with-cpp -DELF"
AC_SUBST(CCAS)
AC_SUBST(CCASFLAGS)


# =================================================================
# arch compilation tuning
 
# The alpha architecture needs special flags for binary portability

case "$target" in
    i686-*-linux*)
        #CFLAGS="-g -mpentiumpro -O6 -ffast-math -funroll-loops -fomit-frame-pointer -fexpensive-optimizations"
        #CFLAGS="-g -mpentiumpro -O6 -ffast-math -funroll-loops -fexpensive-optimizations"
        ;;
    alpha*-*-linux*)
        #CFLAGS="$CFLAGS -mcpu=ev4 -Wa,-mall"
        CFLAGS="$CFLAGS -Wa,-mall"
        ;;
esac

# =================================================================
# Checks for libraries.

# Figure out which math and networking libraries to use
case "$target" in
    *-*-mingw32*)
        MATHLIB=""
        INETLIB="-lwsock32"
	OPENGLLIBS="-lopengl32 -lglu32"
        ;;
    *)
        MATHLIB="-lm"
        INETLIB=""
 	OPENGLLIBS="-lGL -lGLU"
        ;;
esac

AC_SUBST(MATHLIB)
AC_SUBST(INETLIB)
AC_SUBST(OPENGLLIBS)

# =================================================================
# Check for lex/flex

AM_PROG_LEX
if test "$LEX" != flex; then
  LEX="$SHELL $missing_dir/missing flex"
  AC_SUBST(LEX_OUTPUT_ROOT, lex.yy)
  AC_SUBST(LEXLIB, '')
fi

# =================================================================
# Check for PNG
# FIX-ME : the png version isn't checked for now (don't know if useful though)
PNG_VERSION=1.2.0

# AC_CHECK_LIB (library, function, [action-if-found], [action-if-not-found], [other-libraries])

# AC_CHECK_PROG (variable, prog-to-check-for, value-if-found, [value-if-not-found], [path], [reject])

AC_CHECK_PROG(PNG_LIBS,libpng-config,`libpng-config --libs`, )

if test x"$PNG_LIBS" = x; then
	AC_MSG_ERROR([*** libpng not found!])
else 
	AC_CHECK_PROG(PNG_CFLAGS,libpng-config,`libpng-config --cflags`, )
fi

AC_SUBST(PNG_CFLAGS)
AC_SUBST(PNG_LIBS)

# =================================================================
# Check for XML2

AC_CHECK_PROG(XML_LIBS,xml2-config,`xml2-config --libs`, )

if test x"$XML_LIBS" = x; then
        AC_MSG_ERROR([*** libxml2 not found!])
else
	AC_CHECK_PROG(XML_CFLAGS,xml2-config,`xml2-config --cflags`, )
fi

AC_SUBST(XML_LIBS)
AC_SUBST(XML_CFLAGS)

CFLAGS="$CFLAGS $PNG_CFLAGS $XML_CFLAGS"
LIBS="$LIBS $PNG_LIBS $XML_LIBS"

# =================================================================
# Check for X11 
# FIXME : DGA extension necessary -> add a check
# FIXME : at this point, only Xfree is supported, so check for it

X11_LIBS="-L/usr/X11R6/lib -lpthread -lX11 -lXext -lXxf86dga -lXxf86vm"
X11_CFLAGS=""

#AC_PATH_XTRA

#X11_CFLAGS="$X_FLAGS"
#X11_LIBS="$X_PRE_LIBS $X_LIBS $X_EXTRA_LIBS -lXext -lXxf86dga -lXxf86vm"


AC_SUBST(X11_CFLAGS)
AC_SUBST(X11_LIBS)

AM_CONDITIONAL(HAVE_GLX, test x$X_DISPLAY_MISSING = x )


# =================================================================
# Check for SDL

SDL_VERSION=1.2.0

AC_ARG_ENABLE(sdl,
[  AC_HELP_STRING([--disable-sdl], [disable sdl build [default=no]]) ],
   [ sdl_enabled=no ],
   [ sdl_enabled=yes ]
)

AM_PATH_SDL($SDL_VERSION,
            [ have_sdl=yes ]
)

AM_CONDITIONAL(HAVE_SDL, test x$have_sdl = xyes && test x$sdl_enabled = xyes )



# =================================================================
# Game data 

AC_ARG_VAR(GAMEDIR,
[GAMEDIR		defines the quake data subdir [default=${datadir}/games/quake]])

if test x$GAMEDIR = x; then
	GAMEDIR=${datadir}/games/quake
fi

AC_SUBST(GAMEDIR)

# =================================================================
# Enable/disable the i686 asm

AC_ARG_ENABLE(asm,
[  --enable-asm		enable i686 assembly routines [default=no]],
  ,
  [enable_asm=no])
if test x$enable_asm = xyes; then
    CFLAGS="$CFLAGS -DUSE_ASM"
fi

# =================================================================
# Enable/disable user prefs

AC_ARG_ENABLE(userpref,
[  --enable-userpref	enable user preference directory [default=yes]],
  ,
  [enable_userpref=yes])
if test x$enable_userpref = xyes; then
    CFLAGS="$CFLAGS -DUSERPREF_DIR"
fi

CFLAGS="$CFLAGS -DELF"

# =================================================================
# Checks for header files.

AC_HEADER_STDC
AC_HEADER_SYS_WAIT
AC_CHECK_HEADERS([arpa/inet.h fcntl.h limits.h netdb.h netinet/in.h stddef.h stdlib.h string.h sys/file.h sys/ioctl.h sys/param.h sys/socket.h sys/time.h termios.h unistd.h])

# =================================================================
# Checks for typedefs, structures, and compiler characteristics.
AC_C_CONST
AC_C_INLINE
AC_TYPE_SIZE_T
AC_HEADER_TIME
AC_STRUCT_TM

# =================================================================
# Checks for library functions.
AC_FUNC_ALLOCA
AC_PROG_GCC_TRADITIONAL
AC_FUNC_MALLOC
AC_FUNC_MEMCMP
AC_FUNC_MMAP
AC_TYPE_SIGNAL
AC_FUNC_STAT
AC_FUNC_VPRINTF
AC_CHECK_FUNCS([atexit floor gethostbyaddr gethostbyname gethostname gethrtime getpagesize gettimeofday getwd inet_ntoa memset mkdir munmap pow select socket sqrt strcasecmp strchr strerror strstr])

# =================================================================
# Generate build files

AC_CONFIG_FILES([Makefile])
AC_OUTPUT