dnl Process this file with autoconf to produce a configure script.
AC_INIT(gtkgl/gtkglarea.h)

VERSION=1.2.2
PACKAGE=gtkglarea

#shared library versioning
GTKGL_LIBRARY_VERSION=5:0:1
#                     | | |
#              +------+ | +---+
#              |        |     |
#           current:revision:age
#              |        |     |
#              |        |     +- increment if interfaces have been added
#              |        |        set to zero if interfaces have been removed or changed
#              |        +- increment if source code has changed
#              |           set to zero if current is incremented
#              +- increment if interfaces have been added, removed or changed
# 

AM_INIT_AUTOMAKE($PACKAGE, $VERSION, no-define)
AC_SUBST(GTKGL_LIBRARY_VERSION)


dnl Checks for programs.
AC_PROG_CC
AC_PROG_CPP
AM_PROG_LIBTOOL
AM_SANITY_CHECK
AM_MAINTAINER_MODE

dnl Check for GTK libraries
AM_PATH_GTK(,,AC_MSG_ERROR([Cannot find proper gtk version]))

dnl Check for GL/MesaGL libraries
AC_ARG_WITH(GL-prefix,  [  --with-GL-prefix=DIR    Prefix where GL/MesaGL is installed])
AC_ARG_WITH(lib-GL,     [  --with-lib-GL           use '-lGL'])
AC_ARG_WITH(lib-MesaGL, [  --with-lib-MesaGL       use '-lMesaGL'])

if test "x$with_GL_prefix" = "x" ; then
 GL_LDOPTS=""
 GL_CFLAGS=""
else
 GL_LDOPTS="-L$with_GL_prefix/lib"
 GL_CFLAGS="-I$with_GL_prefix/include"
fi

saved_LIBS="$LIBS"

AC_MSG_CHECKING([OpenGL])
LIBS="$saved_LIBS $GTK_LIBS $GL_LDOPTS -lGL"
AC_TRY_LINK( ,[ char glBegin(); glBegin(); ], have_GL=yes, have_GL=no)
AC_MSG_RESULT($have_GL)

AC_MSG_CHECKING([Mesa])
LIBS="$saved_LIBS $GTK_LIBS $GL_LDOPTS -lMesaGL"
AC_TRY_LINK( ,[ char glBegin(); glBegin(); ], have_MesaGL=yes, have_MesaGL=no)
AC_MSG_RESULT($have_MesaGL)

if test "x$have_MesaGL" = "xno"; then
 AC_MSG_CHECKING([Mesa with pthreads])
 LIBS="$saved_LIBS $GTK_LIBS $GL_LDOPTS -lMesaGL -lpthread"
 AC_TRY_LINK( ,[ char glBegin(); glBegin(); ], have_MesaGL_pthread=yes, have_MesaGL_pthread=no)
 AC_MSG_RESULT($have_MesaGL_pthread)
fi

LIBS="$saved_LIBS"


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

 if test "x$have_GL" = "xyes"; then
  GL_LIBS="$GL_LDOPTS -lGLU -lGL"
 else
  AC_MSG_ERROR([Missing GL library])
 fi

elif test "x$with_lib_MesaGL" = "xyes"; then

 if test "x$have_MesaGL" = "xyes"; then
  GL_LIBS="$GL_LDOPTS -lMesaGLU -lMesaGL"
 elif test "x$have_MesaGL_pthread" = "xyes"; then
  GL_LIBS="$GL_LDOPTS -lMesaGLU -lMesaGL -lpthread"
 else
  AC_MSG_ERROR([Missing MesaGL library])
 fi

else

 if test "x$have_GL" = "xyes"; then
  GL_LIBS="$GL_LDOPTS -lGLU -lGL"
 elif test "x$have_MesaGL" = "xyes"; then
  GL_LIBS="$GL_LDOPTS -lMesaGLU -lMesaGL"
 elif test "x$have_MesaGL_pthread" = "xyes"; then
  GL_LIBS="$GL_LDOPTS -lMesaGLU -lMesaGL -lpthread"
 else
  AC_MSG_ERROR([You need GL or MesaGL libraries])
 fi

fi

AC_SUBST(GL_CFLAGS)
AC_SUBST(GL_LIBS)


CFLAGS="$CFLAGS $GTK_CFLAGS $GL_CFLAGS"

dnl Checks for header files.
AC_HEADER_STDC


dnl Checks for typedefs, structures, and compiler characteristics.
AC_C_CONST

dnl Checks for library functions.


AC_OUTPUT(Makefile
          gtkglarea.spec
          gtkgl/Makefile
          docs/Makefile
          examples/Makefile)