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dnl @synopsis AX_CHECK_GL
dnl
dnl Check for an OpenGL implementation. If GL is found, the required
dnl compiler and linker flags are included in the output variables
dnl "GL_CFLAGS" and "GL_LIBS", respectively. This macro adds the
dnl configure option "--with-apple-opengl-framework", which users can
dnl use to indicate that Apple's OpenGL framework should be used on Mac
dnl OS X. If Apple's OpenGL framework is used, the symbol
dnl "HAVE_APPLE_OPENGL_FRAMEWORK" is defined. If no GL implementation
dnl is found, "no_gl" is set to "yes".
dnl
dnl @category InstalledPackages
dnl @author Braden McDaniel <braden@endoframe.com>
dnl @version 2004-11-15
dnl @license AllPermissive
AC_DEFUN([AX_CHECK_GL],
[AC_REQUIRE([AC_PATH_X])dnl
AC_REQUIRE([ACX_PTHREAD])dnl
#
# There isn't a reliable way to know we should use the Apple OpenGL framework
# without a configure option. A Mac OS X user may have installed an
# alternative GL implementation (e.g., Mesa), which may or may not depend on X.
#
AC_ARG_WITH([apple-opengl-framework],
[AC_HELP_STRING([--with-apple-opengl-framework],
[use Apple OpenGL framework (Mac OS X only)])])
if test "X$with_apple_opengl_framework" = "Xyes"; then
AC_DEFINE([HAVE_APPLE_OPENGL_FRAMEWORK], [1],
[Use the Apple OpenGL framework.])
GL_LIBS="-framework OpenGL"
else
AC_LANG_PUSH(C)
AX_LANG_COMPILER_MS
if test X$ax_compiler_ms = Xno; then
GL_CFLAGS="${PTHREAD_CFLAGS}"
GL_LIBS="${PTHREAD_LIBS} -lm"
fi
#
# Use x_includes and x_libraries if they have been set (presumably by
# AC_PATH_X).
#
if test "X$no_x" != "Xyes"; then
if test -n "$x_includes"; then
GL_CFLAGS="-I${x_includes} ${GL_CFLAGS}"
fi
if test -n "$x_libraries"; then
GL_LIBS="-L${x_libraries} -lX11 ${GL_LIBS}"
fi
fi
AC_CHECK_HEADERS([windows.h])
AC_CACHE_CHECK([for OpenGL library], [ax_cv_check_gl_libgl],
[ax_cv_check_gl_libgl="no"
ax_save_CPPFLAGS="${CPPFLAGS}"
CPPFLAGS="${GL_CFLAGS} ${CPPFLAGS}"
ax_save_LIBS="${LIBS}"
LIBS=""
ax_check_libs="-lopengl32 -lGL"
for ax_lib in ${ax_check_libs}; do
if test X$ax_compiler_ms = Xyes; then
ax_try_lib=`echo $ax_lib | sed -e 's/^-l//' -e 's/$/.lib/'`
else
ax_try_lib="${ax_lib}"
fi
LIBS="${ax_try_lib} ${GL_LIBS} ${ax_save_LIBS}"
AC_LINK_IFELSE(
[AC_LANG_PROGRAM([[
# if HAVE_WINDOWS_H && defined(_WIN32)
# include <windows.h>
# endif
# include <GL/gl.h>]],
[[glBegin(0)]])],
[ax_cv_check_gl_libgl="${ax_try_lib}"; break])
done
LIBS=${ax_save_LIBS}
CPPFLAGS=${ax_save_CPPFLAGS}])
if test "X${ax_cv_check_gl_libgl}" = "Xno"; then
no_gl="yes"
GL_CFLAGS=""
GL_LIBS=""
else
GL_LIBS="${ax_cv_check_gl_libgl} ${GL_LIBS}"
fi
AC_LANG_POP(C)
fi
AC_SUBST([GL_CFLAGS])
AC_SUBST([GL_LIBS])
])dnl
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