#                                               -*- Autoconf -*-
# Process this file with autoconf to produce a configure script.

AC_PREREQ(2.59)
AC_INIT(nogravity, 1.99, http://sourceforge.net/projects/nogravity)
AM_INIT_AUTOMAKE(nogravity, 1.99)

AC_CONFIG_SRCDIR(preferences.c)
AC_CONFIG_HEADER(autoconfig.h)
AC_CONFIG_FILES([Makefile])

# Define arguments.
AC_ARG_ENABLE(debug,[  --enable-debug          Enable debug mode],
  [if test "$enableval" = "yes"
   then
     AC_DEFINE([_DEBUG], 1, [Define to 1 if debug mode is enabled.])
   fi])
use_opengl="yes"
AC_ARG_ENABLE(opengl, [  --enable-opengl         Enable use of OpenGL (enabled by default)],
  [if test "$enableval" = "no"
   then
     use_opengl="no"
   fi])
AM_CONDITIONAL(USE_OPENGL, test "$use_opengl" = "yes")
AC_ARG_ENABLE(sound, [  --enable-sound=type     Specify sound library (sdl_mixer or openal)],
  [sound="$enableval"])

# Checks for programs.
AC_PROG_CXX
AC_PROG_CC

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

# Checks for standard headers and functions.
AC_HEADER_STDC
AC_CHECK_HEADERS([stddef.h stdint.h stdlib.h string.h unistd.h])
AC_FUNC_MALLOC
AC_FUNC_MEMCMP
AC_FUNC_REALLOC
AC_FUNC_VPRINTF
AC_CHECK_FUNCS([atexit getcwd memmove memset mkdir pow strchr strstr strtol])

# Checks for SDL.  Note that we don't use AM_PATH_SDL because it's not always
# supported.
AC_CHECK_PROG(HAVE_SDL_CONFIG, [sdl-config], yes)
if test "$HAVE_SDL_CONFIG" = "yes"
then
  CFLAGS="`sdl-config --cflags` $CFLAGS"
  LIBSS="`sdl-config --libs` $LIBS"
else
  AC_MSG_WARN([Can't find sdl-config, guessing required headers and libraries.])
fi
AC_CHECK_HEADERS([SDL/SDL.h], , AC_MSG_ERROR([Can't find SDL headers.]))
AC_CHECK_LIB([SDL], [SDL_Init], , AC_MSG_ERROR([Can't find SDL library.]))

# If we're using OpenGL, test for it.
if test "$use_opengl" = "yes"
then
  # Checks for OpenGL.
  AC_CHECK_HEADERS([GL/gl.h], , AC_MSG_ERROR([Can't find OpenGL headers.]))
  AC_CHECK_LIB([GL], [glBegin], , AC_MSG_ERROR([Can't find OpenGL library.]))

  # Check for OpenGL 1.4 support.
  AC_CACHE_CHECK([for OpenGL 1.4 support], ac_cv_opengl_1_4_support, AC_TRY_RUN([
#include <GL/gl.h>"
#include <GL/glext.h>"
int main (int argc, char *argv[])
{
#ifdef GL_VERSION_1_4
  return 0;
#else
  return 1;
#endif
}
], [AS_VAR_SET(ac_cv_opengl_1_4_support, yes)], [AS_VAR_SET(ac_cv_opengl_1_4_support, no)]))
  AS_IF([test "AS_VAR_GET(ac_cv_opengl_1_4_support)" = "yes"], , AC_MSG_WARN([Some features will be disabled.]))
fi

# Checks for OpenAL (optional).
if test "$sound" = "openal"
then
  AC_CHECK_HEADERS([AL/al.h AL/alc.h], , AC_MSG_ERROR([Can't find OpenAL headers for sound.]))
  AC_CHECK_LIB([openal], [alGenSources], , AC_MSG_ERROR([Can't find OpenAL library for sound.]))
fi

# Checks for SDL_mixer (optional).
if test "$sound" = "sdl_mixer"
then
  AC_CHECK_HEADERS([SDL/SDL_mixer.h], , AC_MSG_ERROR([Can't find SDL_mixer headers for sound.]))
  AC_CHECK_LIB([SDL_mixer], [Mix_OpenAudio], , AC_MSG_ERROR([Can't find SDL_mixer library for sound.]))
fi

# Checks for libpng.
AC_CHECK_PROG(HAVE_LIBPNG_CONFIG, [libpng-config], yes)
if test "$HAVE_LIBPNG_CONFIG" = "yes"
then
  CFLAGS="`libpng-config --cflags` $CFLAGS"
  LDFLAGS="`libpng-config --ldflags` $LDFLAGS"
else
  AC_MSG_WARN([Can't find libpng-config, guessing required headers and libraries.])
fi
AC_CHECK_HEADERS([png.h], , AC_MSG_ERROR([Can't find libpng header.]))
AC_CHECK_LIB([png], [png_read_info], , AC_MSG_ERROR([Can't find libpng library.]))

# Checks for Ogg.
AC_CHECK_LIB([ogg], [ogg_stream_init], , AC_MSG_ERROR([Can't find Ogg library.]))

# Checks for Vorbis.
AC_CHECK_HEADERS([vorbis/codec.h], , AC_MSG_ERROR([Can't find Vorbis header.]))
AC_CHECK_LIB([vorbis], [vorbis_synthesis_init], , AC_MSG_ERROR([Can't find Vorbis library.]))

# Output it all.
AC_OUTPUT