MAMEWorld Forums - EmuChat - Re: Sony CXA2025AS US

> I'm out of town until tomorrow evening and I don't know if I'll have time then.
>
> But it's easy-peasey to write a shader that can (gamma correctly) encode/decode YIQ
> with whatever matrix you want and provides tint/color controls as well. I could have
> it let you chose between pre-defined decode matrices and/or let you provide your own.
>
> I can post a modified version of the hlsl.json along with the the new bgfx
> shaders/effect json files/source here if you want. I can also provide a simpler
> shader chain that applies only the color corrections without all the other stuff from
> the hlsl chain.
>
> Are there other matrices besides the standard matrix and the Sony IC that are worth
> pre-defining? I'll take a look around the interwebs and see.
>
> Of course, I'm not a MAMEDEV (or any dev) so don't expect MAME to adopt it.

Very cool and thank you. It is appreciated. It was a passing thought and wondered of the possibilities under MAME, especially considering other highly regarded emulators, such as Vice and Nestopia - which for several years contain video tweaking options including tint/hue control, saturation, brightness, contrast, etc., yet offer up the Sony CXA2025AS US decode matrix as an alternative relatively recently.

No other additional decode matrix for NTSC - either 'NTSC' or the 'NTSC Sony US' one appear to be present at this time that I am aware of; at the very least, none of which that has received the attention and consideration of "Sony CXA2025AS US".

Perhaps it is significant enough to warrant such an inclusion to MAMEDev, especially when understanding to simulate something similar under MAME, per your other excellent reply earlier, is evidently more than just a hue or saturation control adjustment.

The 'base' hues are indeed considerably different, the sky in SMB1 being one of the most obvious examples; additionally, contrasting color differences in the ground and pillars in Rygar, and skin tones in Double Dragon, are among a plethora of other noticeable hue base changes between 'NTSC' and 'NTSC Sony US'.

All adjustments cannot be aligned properly with the aforementioned typical consumer adjustment controls [Hence, the need for inclusion of this alternate decode matrix

]. One area may be tweaked, but it will throw off another due to these 'base' differences.

Regardless of the outcome, thank you again for your time and consideration.