Togl Stereo Modes
Contents
There are lots of stereo modes in Togl because there are many ways to
draw stereo with different tradeoffs.
All of the stereo modes are chosen with the
-stereo configuration option.
All of the non-native stereo techniques
are software-only and can be changed at anytime.
When using a non-native stereo mode, the OpenGL
glDrawBuffer, glClear,
glFrustum, and glOrtho calls
should be replaced with the Togl
Tcl or
C versions
for seemless stereo rendering.
The various stereo modes are:
-
none or "" or any false boolean value
-
Turn off stereo.
native or any true boolean value
-
Use native OpenGL hardware accelerated stereo
(single- or double-buffered for both the left and the right eyes).
Each eye is drawn at full window resolution
which gives the best stereo image.
This mode requires support from the graphics driver and is
typically only supported on workstation-class graphics cards, e.g.,
NVidia Quadro,
ATI FireGL,
Matrix Parhelia,
3DLabs Wildcat
graphics cards
and SGI workstations.
The video refresh rate is changed automatically by the windowing system
except on SGI workstations.
Developers for SGI workstations can either switch the video manually with
/usr/gfx/setmon or /usr/bin/X11/xsetmon, or use the
autostereo package.
Currently, there is a limitation that a togl widget can not be
reconfigured in or out of the native stereo mode.
And if/when it is supported,
some graphics drivers might not allow it.
-
anaglyph
-
Draw the left eye in the red part of the color buffer
and the right eye in the blue and green parts.
Designed to be viewed with inexpensive red-blue or red-cyan glasses.
Works best with gray scale and non-saturated color images.
-
cross-eye
-
Draw right eye image on the left half of screen,
and draw left eye image on the right half of screen.
So each eye is drawn at less than half of the window resolution.
-
wall-eye
-
Draw left eye image on the left half of the screen,
and draw right eye image on the right half of the screen.
So each eye is drawn at less than half of the window resolution.
-
dti
-
Designed for DTI displays.
If you look at the window unassisted,
you'll see horizonally squished images
with the left eye image on the left,
and right eye image on the right.
So each eye is drawn at half of the window resolution.
-
row interleaved
-
Designed for
VRex,
Zalman, and
Hyundai displays.
Where the right eye is on the even scanlines
and the left is on the odd ones.
Requires that there be a stencil buffer
and uses the most significant stencil bit.
Changes to the stencil state should be placed within
glPushAttrib(GL_STENCIL_BUFFER_BIT) and glPopAttrib() calls.
-
left eye
-
Only draw left eye view at full resolution.
-
right eye
-
Only draw right eye view at full resolution.
-
sgioldstyle
-
Support older-style SGI stereo where you lose half of the vertical resolution.
This uses the SGIStereo X extension,
that is only available on SGI workstations,
to tell the X server to duplicate non-stereo windows into both eyes.
This option only works when the monitor has been changed to the one
of the
str_top, str_bot, or str_rect video output modes.
