Is screen tilt possible with the HDMI buffer?

Discussion about displays and related hardware including MiSTer filters and video settings.
JayBee
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Is screen tilt possible with the HDMI buffer?

Unread post by JayBee »

I am currently exploring the possibilities of making an open source portable MiSTer, and I found a possible screen for it.
It has a resolution of 1440x1600@60Hz (just under the max HDMI bandwidth limit), probably the same as the one used in a recent very hard to get portable device :lol:
I was able to create a custom video mode for it and it works nicely, but as you might have guessed already, it has one big flaw; the screen is actually vertical, not horizontal :?

So I was wondering if there was a way to tilt the screen globally with the HDMI framebuffer.
I won't be using framerate match functions (I am already limited to vsync_adjust=0 with that screen).
Of course I understand that it's probably not currently implemented on MiSTer, and cores maybe won't like it, I just wanted to know if it was possible/doable or if I'd better go for a natively horizontal 1080p screen instead.

Thanks :)
lexthehex
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Re: Is screen tilt possible with the HDMI buffer?

Unread post by lexthehex »

You can rotate the framebuffer globally by using osd_rotate in MiSTer.ini.
Set it to 0 for no rotation, 1 to rotate right through 90 degrees, and 2 to rotate left. So far I haven't found any way to rotate the display for each core, so this is of limited use. Can anyone else help?
JayBee
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Re: Is screen tilt possible with the HDMI buffer?

Unread post by JayBee »

It doesn't rotate the framebuffer tho, it just tilts the osd ;)
JayBee
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Re: Is screen tilt possible with the HDMI buffer?

Unread post by JayBee »

Since screen tilt is not a simple thing to do, and it's an uncommon use case scenario, nobody seems to be interested in it, which I can totally understand.
I also contacted several distributors for those screens, and they aren't interested either in making them horizontal oriented in hardware, and just tell me to change the tilt in windows/Linux...
Well, I guess I'll have to go to the 1080p route then.
lexthehex
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Re: Is screen tilt possible with the HDMI buffer?

Unread post by lexthehex »

It's a neat idea though - it reminds me of portrait-aspect Apple Macs of the early 90s. Arcade games that use a portrait mode would look better on such a screen.
JayBee
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Re: Is screen tilt possible with the HDMI buffer?

Unread post by JayBee »

lexthehex wrote: Sat Mar 19, 2022 9:48 am It's a neat idea though - it reminds me of portrait-aspect Apple Macs of the early 90s. Arcade games that use a portrait mode would look better on such a screen.
Yeah I'm sure it can work with arcade games in portrait mode.
But it's not really the goal here, what I want to do is being able to tilt it in landscape instead to be able to play every other games on it ;)
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