# Configure paths for SDL

# Sam Lantinga 9/21/99

# stolen from Manish Singh

# stolen back from Frank Belew

# stolen from Manish Singh

# Shamelessly stolen from Owen Taylor

# serial 1

dnl AM_PATH_SDL2([MINIMUM-VERSION, [ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]]])

dnl Test for SDL, and define SDL_CFLAGS and SDL_LIBS

dnl

AC_DEFUN([AM_PATH_SDL2],

[dnl 

dnl Get the cflags and libraries from the sdl2-config script

dnl

AC_ARG_WITH(sdl-prefix,[  --with-sdl-prefix=PFX   Prefix where SDL is installed (optional)],

            sdl_prefix="$withval", sdl_prefix="")

AC_ARG_WITH(sdl-exec-prefix,[  --with-sdl-exec-prefix=PFX Exec prefix where SDL is installed (optional)],

            sdl_exec_prefix="$withval", sdl_exec_prefix="")

AC_ARG_ENABLE(sdltest, [  --disable-sdltest       Do not try to compile and run a test SDL program],

		    , enable_sdltest=yes)

  min_sdl_version=ifelse([$1], ,2.0.0,$1)

  if test "x$sdl_prefix$sdl_exec_prefix" = x ; then

    PKG_CHECK_MODULES([SDL], [sdl2 >= $min_sdl_version],

           [sdl_pc=yes],

           [sdl_pc=no])

  else

    sdl_pc=no

    if test x$sdl_exec_prefix != x ; then

      sdl_config_args="$sdl_config_args --exec-prefix=$sdl_exec_prefix"

      if test x${SDL2_CONFIG+set} != xset ; then

        SDL2_CONFIG=$sdl_exec_prefix/bin/sdl2-config

      fi

    fi

    if test x$sdl_prefix != x ; then

      sdl_config_args="$sdl_config_args --prefix=$sdl_prefix"

      if test x${SDL2_CONFIG+set} != xset ; then

        SDL2_CONFIG=$sdl_prefix/bin/sdl2-config

      fi

    fi

  fi

  if test "x$sdl_pc" = xyes ; then

    no_sdl=""

    SDL2_CONFIG="pkg-config sdl2"

  else

    as_save_PATH="$PATH"

    if test "x$prefix" != xNONE && test "$cross_compiling" != yes; then

      PATH="$prefix/bin:$prefix/usr/bin:$PATH"

    fi

    AC_PATH_PROG(SDL2_CONFIG, sdl2-config, no, [$PATH])

    PATH="$as_save_PATH"

    AC_MSG_CHECKING(for SDL - version >= $min_sdl_version)

    no_sdl=""

    if test "$SDL2_CONFIG" = "no" ; then

      no_sdl=yes

    else

      SDL_CFLAGS=`$SDL2_CONFIG $sdl_config_args --cflags`

      SDL_LIBS=`$SDL2_CONFIG $sdl_config_args --libs`

      sdl_major_version=`$SDL2_CONFIG $sdl_config_args --version | \

             sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\1/'`

      sdl_minor_version=`$SDL2_CONFIG $sdl_config_args --version | \

             sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\2/'`

      sdl_micro_version=`$SDL2_CONFIG $sdl_config_args --version | \

             sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\3/'`

      if test "x$enable_sdltest" = "xyes" ; then

        ac_save_CFLAGS="$CFLAGS"

        ac_save_CXXFLAGS="$CXXFLAGS"

        ac_save_LIBS="$LIBS"

        CFLAGS="$CFLAGS $SDL_CFLAGS"

        CXXFLAGS="$CXXFLAGS $SDL_CFLAGS"

        LIBS="$LIBS $SDL_LIBS"

dnl

dnl Now check if the installed SDL is sufficiently new. (Also sanity

dnl checks the results of sdl2-config to some extent

dnl

      rm -f conf.sdltest

      AC_TRY_RUN([

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include "SDL.h"

char*

my_strdup (char *str)

{

  char *new_str;

  if (str)

    {

      new_str = (char *)malloc ((strlen (str) + 1) * sizeof(char));

      strcpy (new_str, str);

    }

  else

    new_str = NULL;

  return new_str;

}

int main (int argc, char *argv[])

{

  int major, minor, micro;

  char *tmp_version;

  /* This hangs on some systems (?)

  system ("touch conf.sdltest");

  */

  { FILE *fp = fopen("conf.sdltest", "a"); if ( fp ) fclose(fp); }

  /* HP/UX 9 (%@#!) writes to sscanf strings */

  tmp_version = my_strdup("$min_sdl_version");

  if (sscanf(tmp_version, "%d.%d.%d", &major, &minor, &micro) != 3) {

     printf("%s, bad version string\n", "$min_sdl_version");

     exit(1);

   }

   if (($sdl_major_version > major) ||

      (($sdl_major_version == major) && ($sdl_minor_version > minor)) ||

      (($sdl_major_version == major) && ($sdl_minor_version == minor) && ($sdl_micro_version >= micro)))

    {

      return 0;

    }

  else

    {

      printf("\n*** 'sdl2-config --version' returned %d.%d.%d, but the minimum version\n", $sdl_major_version, $sdl_minor_version, $sdl_micro_version);

      printf("*** of SDL required is %d.%d.%d. If sdl2-config is correct, then it is\n", major, minor, micro);

      printf("*** best to upgrade to the required version.\n");

      printf("*** If sdl2-config was wrong, set the environment variable SDL2_CONFIG\n");

      printf("*** to point to the correct copy of sdl2-config, and remove the file\n");

      printf("*** config.cache before re-running configure\n");

      return 1;

    }

}

],, no_sdl=yes,[echo $ac_n "cross compiling; assumed OK... $ac_c"])

        CFLAGS="$ac_save_CFLAGS"

        CXXFLAGS="$ac_save_CXXFLAGS"

        LIBS="$ac_save_LIBS"

      fi

    fi

    if test "x$no_sdl" = x ; then

      AC_MSG_RESULT(yes)

    else

      AC_MSG_RESULT(no)

    fi

  fi

  if test "x$no_sdl" = x ; then

     ifelse([$2], , :, [$2])

  else

     if test "$SDL2_CONFIG" = "no" ; then

       echo "*** The sdl2-config script installed by SDL could not be found"

       echo "*** If SDL was installed in PREFIX, make sure PREFIX/bin is in"

       echo "*** your path, or set the SDL2_CONFIG environment variable to the"

       echo "*** full path to sdl2-config."

     else

       if test -f conf.sdltest ; then

        :

       else

          echo "*** Could not run SDL test program, checking why..."

          CFLAGS="$CFLAGS $SDL_CFLAGS"

          CXXFLAGS="$CXXFLAGS $SDL_CFLAGS"

          LIBS="$LIBS $SDL_LIBS"

          AC_TRY_LINK([

#include <stdio.h>

#include "SDL.h"

int main(int argc, char *argv[])

{ return 0; }

#undef  main

#define main K_and_R_C_main

],      [ return 0; ],

        [ echo "*** The test program compiled, but did not run. This usually means"

          echo "*** that the run-time linker is not finding SDL or finding the wrong"

          echo "*** version of SDL. If it is not finding SDL, you'll need to set your"

          echo "*** LD_LIBRARY_PATH environment variable, or edit /etc/ld.so.conf to point"

          echo "*** to the installed location  Also, make sure you have run ldconfig if that"

          echo "*** is required on your system"

	  echo "***"

          echo "*** If you have an old version installed, it is best to remove it, although"

          echo "*** you may also be able to get things to work by modifying LD_LIBRARY_PATH"],

        [ echo "*** The test program failed to compile or link. See the file config.log for the"

          echo "*** exact error that occured. This usually means SDL was incorrectly installed"

          echo "*** or that you have moved SDL since it was installed. In the latter case, you"

          echo "*** may want to edit the sdl2-config script: $SDL2_CONFIG" ])

          CFLAGS="$ac_save_CFLAGS"

          CXXFLAGS="$ac_save_CXXFLAGS"

          LIBS="$ac_save_LIBS"

       fi

     fi

     SDL_CFLAGS=""

     SDL_LIBS=""

     ifelse([$3], , :, [$3])

  fi

  AC_SUBST(SDL_CFLAGS)

  AC_SUBST(SDL_LIBS)

  rm -f conf.sdltest

])