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From: Lawrence D'Oliveiro <ldo@nz.invalid>
Newsgroups: comp.arch
Subject: Re: Misc: Applications of small floating point formats.
Date: Sat, 3 Aug 2024 05:33:01 -0000 (UTC)
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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.