kc3-lang/ftgl/unix/m4/gl.m4

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• Hash : 90d5ca84
  Author :
  Date : 2003-04-14T09:18:03
  

  Adapt to utterly broken setups with extremely fscked up OpenGL installations. The script will check for -lGL, -lGL + X flags or whatever the user provides. Same thing for GLUT. If *this* fails, the user will get a friendly message stating that he should pass the proper location for the GL libraries on the configure line.

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• unix/m4/gl.m4

• dnl FTGL_CHECK_GL()
  dnl Check for OpenGL development environment and GLU >= 1.2
  dnl
  AC_DEFUN([FTGL_CHECK_GL],
  [dnl
  AC_REQUIRE([AC_PROG_CC])
  AC_REQUIRE([AC_PATH_X])
  AC_REQUIRE([AC_PATH_XTRA])
  
  AC_ARG_WITH([--with-gl-inc],
      AC_HELP_STRING([--with-gl-inc=DIR],[Directory where GL/gl.h is installed]))
  AC_ARG_WITH([--with-gl-lib],
      AC_HELP_STRING([--with-gl-lib=DIR],[Directory where OpenGL libraries are installed]))
  
  AC_LANG_SAVE
  AC_LANG_C
  
  GL_SAVE_CPPFLAGS="$CPPFLAGS"
  GL_SAVE_LIBS="$LIBS"
  
  if test "x$no_x" != xyes ; then
      GL_CFLAGS="$X_CFLAGS"
      GL_X_LIBS="$X_PRE_LIBS $X_LIBS -lX11 -lXext -lXmu $X_EXTRA_LIBS"
  fi
  
  if test "x$with_gl_inc" != "xnone" ; then
      if test -d "$with_gl_inc" ; then
          GL_CFLAGS="-I$with_gl_inc"
      else
          GL_CFLAGS="$with_gl_inc"
      fi
  else
      GL_CFLAGS=
  fi
  
  CPPFLAGS="$GL_CFLAGS"
  AC_CHECK_HEADER([GL/gl.h], [], [AC_MSG_ERROR(GL/gl.h is needed, please specify its location with --with-gl-inc)])
  
  AC_MSG_CHECKING([for GL library])
  if test "x$with_gl_lib" != "x" ; then
      if test -d "$with_gl_lib" ; then
          LIBS="-L$with_gl_lib -lGL"
      else
          LIBS="$with_gl_lib"
      fi
  else
      LIBS="-lGL"
  fi
  AC_LINK_IFELSE([AC_LANG_CALL([],[glBegin])],[HAVE_GL=yes], [HAVE_GL=no])
  if test "x$HAVE_GL" = xno ; then
      if test "x$GL_X_LIBS" != x ; then
          LIBS="-lGL $GL_X_LIBS"
          AC_LINK_IFELSE([AC_LANG_CALL([],[glBegin])],[HAVE_GL=yes], [HAVE_GL=no])
      fi
  fi
  if test "x$HAVE_GL" = xyes ; then
      AC_MSG_RESULT([yes])
      GL_LIBS=$LIBS
  else
      AC_MSG_RESULT([no])
      AC_MSG_ERROR([GL library could not be found, please specify its location with --with-gl-lib])
  fi
  
  AC_CHECK_HEADER([GL/glu.h])
  AC_MSG_CHECKING([for GLU version >= 1.2])
  AC_TRY_COMPILE([#include <GL/glu.h>], [
  #if !defined(GLU_VERSION_1_2)
  #error GLU too old
  #endif
                 ],
                 [AC_MSG_RESULT([yes])],
                 [AC_MSG_RESULT([no])
                  AC_MSG_ERROR([GLU >= 1.2 is needed to compile this library])
                 ])
  
  AC_MSG_CHECKING([for GLU library])
  LIBS="-lGLU $GL_LIBS"
  AC_LINK_IFELSE([AC_LANG_CALL([],[gluNewTess])],[HAVE_GLU=yes], [HAVE_GLU=no])
  if test "x$HAVE_GLU" = xno ; then
      if test "x$GL_X_LIBS" != x ; then
          LIBS="-lGLU $GL_LIBS $GL_X_LIBS"
          AC_LINK_IFELSE([AC_LANG_CALL([],[gluNewTess])],[HAVE_GLU=yes], [HAVE_GLU=no])
      fi
  fi
  if test "x$HAVE_GLU" = xyes ; then
      AC_MSG_RESULT([yes])
      GL_LIBS="$LIBS"
  else
      AC_MSG_RESULT([no])
      AC_MSG_ERROR([GLU library could not be found, please specify its location with --with-gl-lib])
  fi
  
  AC_SUBST(GL_CFLAGS)
  AC_SUBST(GL_LIBS)
  
  CPPFLAGS="$GL_SAVE_CPPFLAGS"
  LIBS="$GL_SAVE_LIBS"
  AC_LANG_RESTORE
  GL_X_LIBS=""
  ])
  

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