Lumagen had a mode for Non Linear Stretch which might help for wide FOV gaming. It allow custom stretch where the side is stretch more than the center pixel which might be a good fit for Palmer custom HMD. So far my experiment show that NLS only work for different aspect ratio, eg. 4:3 to 16:9 or 16:9 to 21:9 (widescreen). Will check with the engineer if it is possible for similar aspect ratio. Basically if this mode work, I think the hardware solution will be the easy route to make Rift HMD compatible to all PC games.
NLS streching.JPG
Extract from Lumagen manual.
Non-linear Stretch
Non-linear-stretch (NLS) is used to horizontally stretch a 4:3 aspect ratio source to fit a 16:9 aspect-ratio display or
to stretch a 16:9/1.85 source to fit a 2.35 aspect-ratio display. The image is stretched by a constant amount in the
center and by an increasing amount approaching the left and right edges. This eliminates the black sidebars
normally seen when viewing lower aspect material on a higher aspect display. To use non-linear stretch press the
“4:3”, “16:9” or “1.85” button and then press the “NLS” button.
The goal is to stretch the image to fill the screen in a way that looks as natural as possible. The Lumagen NLS
command is very flexible and allows the image to be adjusted to user preferences to achieve this goal. The NLS
adjustments are center width, center stretch, top cropping and bottom cropping. The center section of the image
is stretched by a constant ratio from 100% to 124%. The width of the center section can be set from 15% to 70%
of the display width. By programming the center section width and stretch amount, the amount of non-linear
stretch in the left and right sections can be optimized. In addition, the top and bottom cropping can be set from 0
to 12%. Increasing the amount of cropping reduces the amount of stretch near the left and right edges of the
image. When setting the cropping parameters, it is recommended that the satellite/cable box menu be checked to
assure that critical parameters remain visible.
Some 4:3 sources fill the entire source image (e.g. DVD 16:9 movies), but other sources place a 4:3 image in the
center of a 16:9 image (e.g. HDTV with up-scaled SD source). This latter case is seen as a “pillar-boxed” image
with black bars on the left and right. The “PILLARBOXED” parameter must be enabled for this case. The Lumagen
will then crop the pillbox bars and stretch the active 4:3 image.
For a 16:9 display, when 4:3 NLS is enabled, the image will fill the screen with a 4:3 (1.33) source for any output
aspect ratio up to 1.85. If the output aspect ratio is greater than 1.85, software limits the maximum width to the
equivalent of 1.78 and adds left and right sidebars.
For a 2.35 display, when 16:9 NLS is enabled, the image will fill the screen with a 16:9 or 1.85 source for any
output aspect ratio up to 2.40. If the output aspect ratio is greater than 2.40, software limits the maximum width
to the equivalent of 2.40 and adds left and right sidebars.
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