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From: "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com>
Newsgroups: comp.arch
Subject: Re: Misc: Applications of small floating point formats.
Date: Sat, 3 Aug 2024 11:44:51 -0700
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On 8/2/2024 10:33 PM, Lawrence D'Oliveiro wrote:
> On Fri, 2 Aug 2024 21:14:33 -0500, BGB wrote:
> 
>> On 8/2/2024 8:35 PM, Lawrence D'Oliveiro wrote:
>>
>>> On Fri, 2 Aug 2024 17:18:17 -0700, Chris M. Thomasson wrote:
>>>
>>>> Taking a screen shot? glReadPixels is okay, right?
>>>
>>> That means grabbing the whole screen, regardless of what else it might
>>> be showing, assuming your window it not occluded, and it further
>>> assumes you have a screen to grab from. This kind of precludes running
>>> the renderer as a batch, background process.
>>
>> The glReadPixels call doesn't grab an image from the OS desktop, but
>> rather from one of the internal framebuffers associated with the OpenGL
>> context.
> 
> Still lousy performance, though. That is simply not considered a serious
> usage scenario for OpenGL. And not for any other on-screen 3D API, as far
> as I’m aware.

Afaict, it's fine for taking a snapshot. I used it to create the 
following animation as a series of frames:

Fractal Boom Box:

https://youtu.be/n13GHyYEfLA