What does an OS need a GPU for?
My current laptop only has integrated Intel GPU. I'm not missing Nvidia, with its proprietary drivers, high power consumption, and corresponding extra heat and shorter battery life...
An 8K 32bpp framebuffer is ... omg 126MB for a single copy. I was going to argue that a software rasterizer running on vcache would be doable, but not for 8k.
For 4k, with 32MB per display buffer, it could be possible but heavy compositing will require going out to main memory. 1440p would be even better at only 15MB per display buffer.
For 1440p at 144Hz and 2TB/s (vcache max), best case is an overdraw of 984 frames/frame
I was doing a11y work for an application a few months back and got interested into the question of desktop screen sizes. I see all these ads for 4k and bigger monitors but they don't show up here
https://gs.statcounter.com/screen-resolution-stats/desktop/w...
And on the steam hardware survey I am seeing a little more than 5% with a big screen.
Myself I am swimming in old monitors and TV to the point where I am going to start putting Pepper's ghost machines in my windows. I think I want to buy a new TV, but I get a free old TV. I pick up monitors that are in the hallway and people are tripping on them and I take them home. Hypothetically I want a state-of-the-art monitor with HDR and wide gamut and all that but the way things are going I might never buy a TV or monitor again.
If the above-linked website uses data reported by the browser, I wonder how this scenario might be taken into consideration (or even if such a thing is possible)
The PC I'm typing this on has two 27in 4k screens. I'm sitting so that I look at them from about 75cm away (that's 2.5 feet in weird units).
I archive most of my video files in 720p, because I genuinely don't see that big of a difference between even 720p and 1080p. It is definitely visible, but usually, it does not add much to the experience, considering that most videos today are produced to be watchable on smartphones and tablets just as much as cinema screens or huge TVs. I only make an exception here for "cinematic" content that was intended for the very big screen. That does not necessarily mean movies, but also certain YouTube videos, like "Timelapse of the Future": https://youtube.com/watch?v=uD4izuDMUQA - This one hits differently for me in 4K vs. just 1080p. Having to watch this in just 720p would be tragic, because its cinematography relies on 4K's ability to resolve very fine lines.
So why would I make a point to have both my screens be 4K? Because where else do you look at fine lines a lot? You're looking at it right now: Text. For any occupation that requires reading a lot of text (like programming!), 4K absolutely makes a difference. Even if I don't decrease the font size to get more text on screen at once, just having the outlines of the glyphs be sharper reduces eye strain in my experience.
A complex desktop web form with several pages, lots of combo boxes, repeating fields, etc. I cleaned up the WCAG AA issues and even the S, but the AAA requirement for click targets was out of scope but had me thinking that I wanted to make labels (say on a dropdown menu bar) as big as I reasonably could and that in turn got me thinking about how much space I had to work with on different resolution screens so I looked up those stats and tried to see what would fit in which constraints.
“Ubuntu 7.10 is the first version of Ubuntu that ships with Compiz Fusion enabled by default on supported hardware. Compiz Fusion, which combines Compiz with certain components developed by the Beryl community, is a compositing window manager that adds a wide range of visual effects to Ubuntu's desktop environment. The default settings for Compiz enable basic effects—like window shadows and fading menus—that are subtle and unobtrusive. For more elaborate Compiz features, like wobbling windows, users can select the Extra option on the Visual Effects tab of the Appearance Preferences dialog.”
MacOS in 2000 was still old MacOS, with no compositing at all. The NeXT derived version of MacOS was still in beta, and I tried it back then, it was very rough. Even once OSX shipped in 2001, it was still software composited. Quartz Extreme implemented GPU compositing in 10.2, which shipped in 2002.
Windows finally got a composited desktop in Vista, released in 2007. It was GPU accelerated from day one.
It actually separates the OS from the GPU. Before WDDM your GFX device driver was the only software that could use GFX acceleration. After WDDM the GPU is another "processor" in your computer that can read and write to RAM and the application can use the GPU in user space any way it wants, and then the compositor can to the same (in user space) and in the end all the OS is managing communication with the GPU.
For that approach to work you need to have enough fill rate that you can redraw the screen several times per frame. Microsoft wanted to have enough they could afford some visual bling, but Intel didn't give to them.
Which is far more powerful than the ones that caused problems almost two decades ago.
As people noted, most of your GUI is being rendered by it. Every video you watch is accelerated by it, and if it has some compute support, some applications are using it for faster math at the background (mostly image editors, but who knows).