What is the point of the pseudo hi-res mode?

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Ronian53
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What is the point of the pseudo hi-res mode?

Post by Ronian53 » Thu Oct 22, 2020 6:48 am

Some games like Kirby Dreamland 3 use a psuedo hi res mode that makes the dithering on the layer high resolution to fake transparency. But why do this if the SNES has real transparency?

tepples
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Re: What is the point of the pseudo hi-res mode?

Post by tepples » Thu Oct 22, 2020 8:13 am

One difference I know is that pseudo-hires allows mixing 50% sub with 25% main and 25% COLDATA, or 75% sub with 25% main. Another difference that might (I'm not 100% sure) be relevant is limits on how sprites participate in color math, including which sprite palettes can and can't.

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Nikku4211
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Re: What is the point of the pseudo hi-res mode?

Post by Nikku4211 » Thu Oct 22, 2020 8:46 am

Pseudo hi-res mode can also be used to get a 512px horizontal resolution in modes other than 5 or 6. It does require joining 2 layers, so you still might as well use modes 5 and 6, but at least you can get 2 2BPP layers with mode 0 if you want both layers' tileset graphics to take less space(which is important when your tiles have to be twice as wide in memory just to take the same amount of space in 512px horizontal resolution).
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LucianoTheWindowsFan
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Re: What is the point of the pseudo hi-res mode?

Post by LucianoTheWindowsFan » Wed Nov 18, 2020 10:33 am

The SNES has real transparency. It was the half mode of color math.
The SNES is my favorite console, not only because it is an upgrade to the NES, but because it had some quality games as well (e.g. EarthBound and Kirby's Dream Land 3).

93143
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Re: What is the point of the pseudo hi-res mode?

Post by 93143 » Wed Nov 18, 2020 5:45 pm

No, Kirby and some other games used pseudo-hires to fake half transparency. The advantage is that while it uses up the subscreen the same as a real half blend, it doesn't use up the colour math hardware, so you can still do math with the constant colour in addition to the fake blend (which looks like a real blend on a period TV).

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Nikku4211
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Re: What is the point of the pseudo hi-res mode?

Post by Nikku4211 » Wed Nov 18, 2020 6:05 pm

93143 wrote:
Wed Nov 18, 2020 5:45 pm
No, Kirby and some other games used pseudo-hires to fake half transparency. The advantage is that while it uses up the subscreen the same as a real half blend, it doesn't use up the colour math hardware, so you can still do math with the constant colour in addition to the fake blend (which looks like a real blend on a period TV).
And would still look like a real blend even on a modern HDTV if you're still using composite or RF.

Not sure about S-Video, though.
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Re: What is the point of the pseudo hi-res mode?

Post by tepples » Wed Nov 18, 2020 6:52 pm

On S-Video you can see the vertical stripes, which are 60% finer than the vertical stripes you already see in half of the Genesis library.

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