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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
+