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+Name
+
+    MESA_copy_sub_buffer
+
+Name Strings
+
+    GLX_MESA_copy_sub_buffer
+
+Contact
+
+    Brian Paul (brian.paul 'at' tungstengraphics.com)
+
+Status
+
+    Shipping since Mesa 2.6 in February, 1998.
+
+Version
+
+    Last Modified Date:  12 January 2009
+
+Number
+
+    215
+
+Dependencies
+
+    OpenGL 1.0 or later is required.
+    GLX 1.0 or later is required.
+
+Overview
+
+    The glxCopySubBufferMESA() function copies a rectangular region
+    of the back color buffer to the front color buffer.  This can be
+    used to quickly repaint 3D windows in response to expose events
+    when the back color buffer cannot be damaged by other windows.
+
+IP Status
+
+    Open-source; freely implementable.
+
+Issues
+
+    None.
+
+New Procedures and Functions
+
+    void glXCopySubBufferMESA( Display *dpy, GLXDrawable drawable,
+			       int x, int y, int width, int height );
+
+New Tokens
+
+    None.
+
+Additions to Chapter 3 of the GLX 1.3 Specification (Functions and Errors)
+
+    Add to section 3.3.10 Double Buffering:
+
+    The function
+
+	 void glXCopySubBufferMESA( Display *dpy, GLXDrawable drawable,
+				    int x, int y, int width, int height );
+
+    may be used to copy a rectangular region of the back color buffer to
+    the front color buffer.  This can be used to quickly repaint 3D windows
+    in response to expose events when the back color buffer cannot be
+    damaged by other windows.
+
+    <x> and <y> indicates the lower-left corner of the region to copy and
+    <width> and <height> indicate the size in pixels.  Coordinate (0,0)
+    corresponds to the lower-left pixel of the window, like glReadPixels.
+
+    If dpy and drawable are the display and drawable for the calling
+    thread's current context, glXCopySubBufferMESA performs an
+    implicit glFlush before it returns.  Subsequent OpenGL commands
+    may be issued immediately after calling glXCopySubBufferMESA, but
+    are not executed until the copy is completed. 
+
+GLX Protocol
+
+    None at this time.  The extension is implemented in terms of ordinary
+    Xlib protocol inside of Mesa.
+
+Errors
+
+    None.
+
+New State
+
+    None.
+
+Revision History
+
+    12 January 2009 Ian Romanick - Added language about implicit flush
+                                   and command completion.
+    8 June 2000     Brian Paul   - initial specification
+