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added info about overlay planes

This commit is contained in:
Brian Paul 1998-10-03 12:48:50 +00:00
parent a6922cb8c3
commit 3867fa4cfa
1 changed files with 13 additions and 4 deletions
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17
docs/README.X11
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@ -163,7 +163,7 @@ X Display Modes:
$ export MESA_RGB_VISUAL="PseudoColor 8" $ 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 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 double buffer mode. Using GLX, the default is to use an XImage. The
MESA_BACK_BUFFER environment variable can override this. The valid MESA_BACK_BUFFER environment variable can override this. The valid
@ -177,7 +177,7 @@ Double buffering (X11 only):
your application. your application.
Colormaps (X11 only): Colormaps:
When using Mesa directly or with GLX, it's up to the application writer 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 to create a window with an appropriate colormap. The aux, tk, and GLUT
toolkits try to minimize colormap "flashing" by sharing colormaps when 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. variable MESA_PRIVATE_CMAP. The value isn't significant.
Gamma correction (X11 only): Gamma correction:
To compensate for the nonlinear relationship between pixel values To compensate for the nonlinear relationship between pixel values
and displayed intensities, there is a gamma correction feature in and displayed intensities, there is a gamma correction feature in
Mesa. Some systems, such as Silicon Graphics, support gamma 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 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 HPCR glClear(GL_COLOR_BUFFER_BIT) dithering
If you set the MESA_HPCR_CLEAR environment variable then 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 $