add --enable-gl support, and put the flags/libs in the appropriate makefiles

1 files changed, 65 insertions, 0 deletions

diff --git a/m4/gl.m4 b/m4/gl.m4
new file mode 100644
index 00000000..e3592712
--- /dev/null
+++ b/m4/gl.m4
@@ -0,0 +1,65 @@
+# X11_DEVEL()
+#
+# Check for the presence of the X Window System headers and libraries.
+# Sets the CPPFLAGS and LIBS variables as appropriate.
+AC_DEFUN([GL_OPTION],
+[
+  AC_REQUIRE([X11_DEVEL])
+
+  AC_ARG_ENABLE(gl, [  --enable-gl             enable support for OpenGL rendering default=no],
+                ,[enable_gl="no"])
+
+  # Store these
+  OLDLIBS=$LIBS
+  OLDCPPFLAGS=$CPPFLAGS
+
+  if test "$enable_gl" = "yes"; then
+    AC_CHECK_LIB([GL], [glXGetConfig],
+                 ,
+                 [
+                   enable_gl="no"
+                   AC_MSG_WARN([Disabling GL rendering support])
+                 ])
+  fi
+
+  if test "$enable_gl" = "yes"; then
+    CPPFLAGS="$CPPFLAGS $X_CFLAGS"
+    LIBS="$LIBS $X_PRE_LIBS $X_LIBS $X_EXTRA_LIBS"
+
+    AC_MSG_CHECKING([if we can compile with GL])
+    AC_TRY_LINK(
+    [
+      #include <GL/gl.h>
+    ],
+    [
+      GLfloat f = 0.0;
+      glVertex3f(f, f, f);
+    ],
+    [
+      AC_MSG_RESULT([yes])
+    ],
+    [
+      AC_MSG_RESULT([no])
+      AC_MSG_WARN([Disabling GL rendering support])
+      enable_gl="no"
+    ])
+
+    GL_CFLAGS=""
+    GL_LIBS="-lGL"
+    AC_SUBST(GL_CFLAGS)
+    AC_SUBST(GL_LIBS)
+  fi
+
+  CPPFLAGS=$OLDCPPFLAGS
+  LIBS=$OLDLIBS
+
+  AC_MSG_CHECKING([if GL support is enabled])
+  if test "$enable_gl" = "yes"; then
+    AC_MSG_RESULT([yes])
+
+    AC_DEFINE(USE_GL)
+  else
+    AC_MSG_RESULT([no])
+  fi
+  AM_CONDITIONAL([USE_GL], [test "$enable_gl" = "yes"])
+])