46
Sun Fire V880z Server and Sun XVR-4000 Graphics Accelerator Installation and User’s Guide • May 2003
Multisampling
Multisample allocation occurs at startup/configuration load time. The configuration
samples-per-pixel parameter specifies the depth that is pre-allocated.
describes the
fbconfig -multisample
options.
-multisample
[
forceon | available | disable
]
Sample Sizes
-samples
specifies the number of samples per pixel to allocate when multisample is
not set to
disable
. The maximum sample size is 16 samples per pixel. Using
fbconfig -samples max
, sample size is automatically allocated based on the
frame buffer memory and video resources available to the stream as the window
system starts up. Allowable choices are 1 to 16 or
max
, but a very high sample
density can be allocated only at low resolution. Setting sample density to 1 is not
equivalent to disabling multisampling; samples will still be subject to filtering and
jitter. See “Disabling Multisampling” on page 48.
lists how many samples per pixel are supported at various resolutions:
TABLE 6-1
Multisample Option Descriptions
Option
Description
forceon
All Sun OpenGL for Solaris applications are rendered using
multisampling.
forceon
is the default. (
force
is an acceptable
abbreviation for this option.)
auto
is an alias for
forceon
.
available
Multisample is possible but is selected on a per application basis.
enable
is an alias for
available
.
disable
No multisample is possible. Filter and jitter are also disabled. This
option, therefore, differs from
-samples 1
option.
TABLE 6-2
Representative Multisampling Support
Resolution
Single Display
Dual Display
Stereo
Stereo (Dual)
1920
×
1200
4
2
1600
×
1200
5
2 and 3
(2 at 75 hz)
1600
×
1000
6
3
1280
×
1024
8
(7 at 85 hz)
4
(3 at 85 Hz)
4
2