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Name
MESA_copy_sub_buffer
Name Strings
GLX_MESA_copy_sub_buffer
Contact
Brian Paul (brian 'at' mesa3d.org)
Status
Shipping since Mesa 1.2.8 in May, 1996.
Version
Last Modified Date: 8 June 2000
Number
???
Dependencies
OpenGL 1.0 or later is required.
GLX 1.0 or later is required.
Overview
Since Mesa allows RGB rendering into drawables with PseudoColor,
StaticColor, GrayScale and StaticGray visuals, Mesa needs a colormap
in order to compute pixel values during rendering.
The colormap associated with a window can be queried with normal
Xlib functions but there is no colormap associated with pixmaps.
The glXCreateGLXPixmapMESA function is an alternative to glXCreateGLXPixmap
which allows specification of a colormap.
IP Status
Open-source; freely implementable.
Issues
None.
New Procedures and Functions
GLXPixmap glXCreateGLXPixmapMESA( Display *dpy, XVisualInfo *visual,
Pixmap pixmap, Colormap cmap );
New Tokens
None.
Additions to Chapter 3 of the GLX 1.3 Specification (Functions and Errors)
Add to section 3.4.2 Off Screen Rendering
The Mesa implementation of GLX allows RGB rendering into X windows and
pixmaps of any visual class, not just TrueColor or DirectColor. In order
to compute pixel values from RGB values Mesa requires a colormap.
The function
GLXPixmap glXCreateGLXPixmapMESA( Display *dpy, XVisualInfo *visual,
Pixmap pixmap, Colormap cmap );
allows one to create a GLXPixmap with a specific colormap. The image
rendered into the pixmap may then be copied to a window (which uses the
same colormap and visual) with the expected results.
GLX Protocol
None since this is a client-side extension.
Errors
None.
New State
None.
Revision History
8 June 2000 - initial specification
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