would it be possible to lit alternatively 1/4 pixels of a 4k monitor to quadruple the refresh rate at 1080p ?

Talk about overclocking displays at a higher refresh rate. This includes homebrew, 165Hz, QNIX, Catleap, Overlord Tempest, SEIKI displays, certain HDTVs, and other overclockable displays.
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Re: would it be possible to lit alternatively 1/4 pixels of a 4k monitor to quadruple the refresh rate at 1080p ?

Post by Chief Blur Buster » 13 Jun 2021, 15:33

BeamCoder wrote:
13 Jun 2021, 09:09
Close enough, the name is about the Beam Synchronized Processor of the Amiga called "Copper". I'm aware of your work since I use WinUAE and currently learning how to program on the Amiga :D . I use the BeamRaced feature sometimes however it jitters on my 2010ish mid range laptop even at 4 slices...
Cool! Do you know how to program other platforms, such as C# or C++ on Windows?

P.S. I presume you have tried Performance Mode while on AC power, while running emulator at 1 level higher process priority. That often helps the jitter a lot. The battery management really kills beam racing accuracy.
BeamCoder wrote:
13 Jun 2021, 09:09
Chief Blur Buster wrote:
11 Jun 2021, 17:45
BeamCoder wrote:
11 Jun 2021, 01:50
Hmmm interesting... I've started to be interested on FPGA's and this could be an interesting project to do.

What do you think is the theoretical minimum an LCD GtG time should be to not get smearing on a 1000Hz LCD? Also I found that the panel use by Asus is M250HAN03.0 which is around 5ms response time according to Panelook.

If LCD GtG is one of the bottlenecks, then with a 360Hz OLED monitor, it would be probably be possible to achieve 1000Hz if the panel architecture allows it.
I notice your nickname BeamCoder. Does that have anything to do with racing the beam (raster interrupts)? If so, you might be interested in reading about my Tearline Jedi work...
Close enough, the name is about the Beam Synchronized Processor of the Amiga called "Copper". I'm aware of your work since I use WinUAE and currently learning how to program on the Amiga :D . I use the BeamRaced feature sometimes however it jitters on my 2010ish mid range laptop even at 4 slices...

Not to take away from your tearline algorithm, but I kind of thought it would be better to have a beam synchronized hardware like the Amiga and Atari 800 has instead of using a CPU thread to busy wait. Also since PC has many different configurations, it probably won't be time-exact, just like with my laptop for example so with a dedicated hardware it would be expected to be time-exact if you have one. But since there's no demand for this, your algorithm is the best option though.
Great to hear from you!

Beamracing-knowledgeable person who still programs today and works with high Hz monitor.... People like you are rare around here!

Do you have your 360 Hz monitor yet?

There's some long term projects I'm interested in collaborators for:

1. Firstly, over the last couple years, the pandemic and other distractions delayed my public release of Tearline Jedi. I'm still looking for collaborators to work on my private github of Tearline Jedi for some potential future submission to a demoscene compo (e.g. Assembly 2021 or 2022). If you have enough spare time, I'd like code beta-testers and at least some minor contributions to improve its crossplatformness to inherit some of Tom Harte's Mac beamracing work, as well as add potentially more "demo segments" to it. After it's hit a demo competition or similar, can publicly release the source code.

2. Secondly, I'm looking for potential collaborators to begin an open source CRT electron beam emulator. For example, for a 360Hz, executes 1/360sec worth of CRT electron beam (rolling scan, like a single computer-generated frame metaphorically similar to a 360fps high speed video of a CRT). This could be a codebase that be used for future RetroArch BFIv3 or MAME Temporal HLSL.

One thing that I'd like to see happen by the ~2025 date range is a CRT electron beam emulator, like the RetroArch BFIv3 or the MAME HLSL concept (rejected by the MAME team as fairy tale)

These projects would be something that can be begun already on an 8-bit 240Hz IPS or 360Hz IPS monitor, as 1/4 and 1/6 refresh cycle software-based rolling-scan emulation should now be at sufficient theoretical quality to look more CRT-realistic than plain BFI.
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