Commit 3867fa4c authored by Brian Paul's avatar Brian Paul
Browse files

added info about overlay planes

parent a6922cb8
......@@ -163,7 +163,7 @@ X Display Modes:
$ export MESA_RGB_VISUAL="PseudoColor 8"
Double buffering (X11 only):
Double buffering:
Mesa can use either an X Pixmap or XImage as the backbuffer when in
double buffer mode. Using GLX, the default is to use an XImage. The
MESA_BACK_BUFFER environment variable can override this. The valid
......@@ -177,7 +177,7 @@ Double buffering (X11 only):
your application.
Colormaps (X11 only):
Colormaps:
When using Mesa directly or with GLX, it's up to the application writer
to create a window with an appropriate colormap. The aux, tk, and GLUT
toolkits try to minimize colormap "flashing" by sharing colormaps when
......@@ -192,7 +192,7 @@ Colormaps (X11 only):
variable MESA_PRIVATE_CMAP. The value isn't significant.
Gamma correction (X11 only):
Gamma correction:
To compensate for the nonlinear relationship between pixel values
and displayed intensities, there is a gamma correction feature in
Mesa. Some systems, such as Silicon Graphics, support gamma
......@@ -231,6 +231,15 @@ Gamma correction (X11 only):
http://www.inforamp.net/~poynton/notes/colour_and_gamma/GammaFAQ.html
Overlay Planes
Overlay planes in the frame buffer are supported by Mesa but require
hardware and X server support. To determine if your X server has
overlay support you can test for the SERVER_OVERLAY_VISUALS property:
xprop -root | grep SERVER_OVERLAY_VISUALS
HPCR glClear(GL_COLOR_BUFFER_BIT) dithering
If you set the MESA_HPCR_CLEAR environment variable then dithering
......@@ -304,4 +313,4 @@ Summary of X-related environment variables:
----------------------------------------------------------------------
$Id: README.X11,v 3.1 1998/07/29 01:19:15 brianp Exp $
$Id: README.X11,v 3.2 1998/10/03 12:48:50 brianp Exp $
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