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

AC_INIT(src/glitz.h)

dnl ===========================================================================

# Package version number, (as distinct from shared library version)
# This must be manually synchronized with the version in src/glitz.h
GLITZ_VERSION=0.1.2

# libtool shared library version

# Increment if the interface has additions, changes, removals.
LT_CURRENT=1

# Increment any time the source changes; set to
# 0 if you increment CURRENT
LT_REVISION=0

# Increment if any interfaces have been added; set to 0
# if any interfaces have been removed. removal has
# precedence over adding, so set to 0 if both happened.
LT_AGE=0

VERSION_INFO="$LT_CURRENT:$LT_REVISION:$LT_AGE"
AC_SUBST(VERSION_INFO)

dnl ===========================================================================

AC_CONFIG_AUX_DIR(config)

AM_INIT_AUTOMAKE(glitz, $GLITZ_VERSION)
AM_CONFIG_HEADER(config.h)

AM_MAINTAINER_MODE

AC_ISC_POSIX
AC_PROG_CC
AC_PROG_CPP
AC_PROG_AWK
AM_PROG_LIBTOOL
AC_STDC_HEADERS

if test "x$GCC" = "xyes"; then
  case " $CFLAGS " in
  *[[\ \	]]-Wall[[\ \	]]*) ;;
  *) CFLAGS="$CFLAGS -Wall" ;;
  esac

  if test "x$enable_ansi" = "xyes"; then
    case " $CFLAGS " in
    *[[\ \	]]-ansi[[\ \	]]*) ;;
    *) CFLAGS="$CFLAGS -ansi" ;;
    esac

    case " $CFLAGS " in
    *[[\ \	]]-pedantic[[\ \	]]*) ;;
    *) CFLAGS="$CFLAGS -pedantic" ;;
    esac
  fi
fi

dnl ===========================================================================

AC_ARG_ENABLE(glx,
  AC_HELP_STRING([--disable-glx], [Disable glitz's GLX backend]),
  [use_glx=$enableval], [use_glx=yes])

AH_TEMPLATE([XTHREADS], [Define if Xlib supports XTHREADS])

if test "x$use_glx" = "xyes"; then
  AC_PATH_XTRA

  if test "x$have_x" = "xyes"; then
    GLX_LIBS="$X_LIBS -lX11 -lGL"
    GLX_CFLAGS="$X_CFLAGS"

    save_LIBS="$LIBS"
    save_CFLAGS="$CFLAGS"
    CFLAGS="$CFLAGS $GLX_CFLAGS"
    LIBS="$LIBS $GLX_LIBS"

    AC_MSG_CHECKING([for XTHREADS in Xlib])
    AC_RUN_IFELSE(
      [AC_LANG_PROGRAM([[#include <X11/Xlib.h>]],
        [[return XInitThreads() == 0 ? 0 : 1;]])],
      [xthreads=no],
      [xthreads=yes],
      [xthreads=yes])

    AC_MSG_RESULT($xthreads)

    LIBS="$save_LIBS"
    CFLAGS="$save_CFLAGS"

    if test "x$xthreads" = "xyes"
    then
      GLX_LIBS="$GLX_LIBS -lpthread"
      AC_DEFINE(XTHREADS, 1)
    fi

    use_glx="yes"
  else
    use_glx="no"
  fi
fi

if test "x$use_glx" = "xyes"; then
  AM_CONDITIONAL(GLITZ_BUILD_GLX_BACKEND, true)
else
  AM_CONDITIONAL(GLITZ_BUILD_GLX_BACKEND, false)
fi

AC_SUBST(GLX_CFLAGS)
AC_SUBST(GLX_LIBS)

dnl ===========================================================================

AC_ARG_ENABLE(agl,
  AC_HELP_STRING([--disable-agl], [Disable glitz's AGL backend]),
  [use_agl=$enableval], [use_agl=yes])

AH_TEMPLATE([PTHREADS], [Define if PTHREADS are supported])

if test "x$use_agl" = "xyes"; then
  AC_MSG_CHECKING([for AGL.framework])
  save_libs="$LIBS"
  LIBS="-framework AGL"
  AC_TRY_LINK_FUNC(aglCreateContext, [use_agl=yes], [use_agl=no])
  LIBS="$save_libs"
  AC_MSG_RESULT([$use_agl])
  
  if test "x$use_agl" = "xyes"; then
    save_libs="$LIBS"
    LIBS="-lpthread"

    AC_MSG_CHECKING([for PTHREADS])
    AC_TRY_LINK_FUNC(pthread_key_create, [use_pthreads=yes], [use_pthreads=no])

    LIBS="$save_LIBS"

    if test "x$use_pthreads" = "xyes"
    then
      AGL_LIBS="$AGL_LIBS -lpthread"
      AC_DEFINE(PTHREADS, 1)
    fi
    AC_MSG_RESULT($use_pthreads)
  fi
fi

if test "x$use_agl" = "xyes"; then
  AM_CONDITIONAL(GLITZ_BUILD_AGL_BACKEND, true)
else
  AM_CONDITIONAL(GLITZ_BUILD_AGL_BACKEND, false)
fi

AC_SUBST(AGL_CFLAGS)
AC_SUBST(AGL_LIBS)

dnl ===========================================================================

AC_OUTPUT([
Makefile
src/Makefile
glitz.pc
glitz-glx.pc
glitz-agl.pc
])

dnl ===========================================================================

echo ""
echo "glitz will be compiled with the following backends:"
echo "  GLX: $use_glx"
echo "  AGL: $use_agl"
echo ""