Gl_Hp_Supersample Extension - HP b2600 Supplementary Manual

overview of OpenGL
OpenGL extensions

GL_HP_supersample extension

This supersample extension defines a mechanism for enabling and
disabling a full scene anti-aliasing method. It is supported on Visualize
fx-10b, FireGL-UX and FireGL T2/X1/X3 graphics hardware. On the
FireGL hardware the X Server must be configured to enable this
capability in order for the extension to be present.
On the FireGL-UX graphics hardware, this extension is enabled by using
SAM to adjust the Display->X Server Configuration->Screen Options set
the "FSAA" option to a supersample resolution (eg. 2.0x2.0) which results
in four samples per screen pixel.
On the FireGL T2/X1/X3 this extension is enabled in a similar manner
by using SAM to adjust the Display->X Server Configuration->Screen
Options set the "FSAAScale" option to a super sample resolution (e.g. 2,
4, or 6) which results in the number of samples per screen pixel. The
actual number of samples used will depend on the availability of video
memory to implement the supersample function and will vary based on
screen resolutions and other functionality that has been also enabled
such as stereo display and offscreen pixmaps.
This extension can be enabled either via the OpenGL API using the
glEnable(GL_SUPERSAMPLE_HP) call or via the environment variable
HPOGL_FORCE_SCENEAA=1 (when in direct rendering mode). The
call glDisable(GL_SUPERSAMPLE_HP) can be used to disable this
mode. These calls need to be made in the same OpenGL rendering
context that is to be supersampled.
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