sync code with last improvements from OpenBSD

app/xlockmore/xlock/visgl.h

@@ -0,0 +1,45 @@
+#ifndef __XLOCK_VISGL_H__
+#define __XLOCK_VISGL_H__
+
+#if !defined( lint ) && !defined( SABER )
+/* #ident	"@(#)visgl.h	5.01 01/02/19 xlockmore" */
+
+#endif
+
+/*-
+ * GL Visual stuff
+ *
+ * See xlock.c for copying information.
+ *
+ * Revision History:
+ * 19-02-01: Started log. :)
+ */
+
+#ifdef USE_GL
+#include <GL/gl.h>
+#include <GL/glx.h>
+
+#ifdef __cplusplus
+  extern "C" {
+#endif
+extern GLXContext *init_GL(ModeInfo * mi);
+extern void FreeAllGL(ModeInfo * mi);
+extern void do_fps (ModeInfo *mi);
+extern void clear_gl_error (void);
+extern Bool check_gl_error (const char *type);
+
+extern XVisualInfo *
+getGLVisual(Display * display, int screen, XVisualInfo * wantVis, int monochrome);
+
+#ifdef __cplusplus
+  }
+#endif
+
+#endif
+
+#ifdef OPENGL_MESA_INCLUDES
+/* Allow OPEN GL using MESA includes */
+#undef MESA
+#endif
+
+#endif /* __XLOCK_VISGL_H__ */