This is intended to be a sort of dev topic if anybody is interested.

I've just released WIP89.2 in which the graphics API dll's are capable of loading an external dll for hooking purposes. The graphics API dll's searches for 'sampleaddon.dll' and load it if it's found.
The only hookable functionality at the moment is the image presentation, and only through D3D12.
I updated the dgVoodoo API package with a sample addon hooking the image output, recoloring the image to a sepia color and applying an old dirty glass texture to it all (not the "feautre" is the point but the addon itself as a sample):

http://dege.fw.hu/temp/dgVoodooAPI_WIP89_2.zip

I know that there is ReShade and alikes for this functionality and I obviously do not intend this to replace them.

But, for example, if you are an enterprising dev person then you can write your super antialiasing shader for dgVoodoo (that can work on the original, unscaled image) which is often missed.
I do not expect a significant interest for this, to put it mildly, but the possibility now is at least given.

If you are interested anyway then look at the documentation included in the zip and compile the sample for yourself (VS2022 is needed I think). It's the very first version and I want to add some things into it and improve it but it's a good start.