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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
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