Forcing DC/Naomi to 240p on CRT (don't user shaders)?

RetroArch General
#1

Hi all,

I know this can be done: Reicast 240p and mame roms support

But I don’t use shaders as use the cores with CRT switchres on a PVM. How can I force the DC and /or Naomi to 240p for games like SFZero 3 Upper and Bangai O on the DC?

Cheers

#2

if you’re using CRT switchres, you can’t AFAIK, as it’s going to send the exact same resolution that the game requests.

#3

The Naomi (and DC) ran in 15hz and 31hz, the former outputting 240p. By default the resolution is 640x480i at 31khz, so 480i. There was a switch on the Naomi board, there’s obviously not an option to do this in the RA core, so I’m wondering if I can specify an internal resolution or anything like that?

#4

With CRT switchres, you would need the core to support forcing that, which is a reasonable request, so maybe open a feature-request issue on the reicast-libretro github repo.

Otherwise, you could maybe do a config override to disable the switchres feature and instead force a video_fullscreen_x/y res of 320x240 or whatever it needs. As long as the modeline already exists on your system, it should snap to it.

#5

Thanks for the help. Is it somewhere in the .ini I would need to edit that? Yes, modeline is in already.

#6

Pardon me if I’m missing something, but I don’t see why it isn’t an option already as 320x240 works when added to libretro.cpp like this:
"Internal resolution (restart); 320x240|640x480|…

#7

Sorry could you explain further how to do that for a noob!

#8

Sorry, I sould have replied to @hunterk to avoid confusion. If they change that line and it doesn’t mess anything up, you won’t have to worry about it :slight_smile:

#9

Thanks for the clarification. Where do I need to post my request to include this?

#10

No need. Twinaphex just added it. If you can download the new core and try it out, I’ll be curious to hear if it does what you need.

1 Like
#11

@Lordbarker Yeah let us know, I’m interested to see how this works. It should work great as its a standard 320x240. However, if there are parts that should be 640x480 you’ll probably have missing lings and things will look a bit weird.

#12

Great. Is this in the nightlies? Couldn’t see it. Do you have a direct link please? Will test tomorrow if so when home and report back :slight_smile:

#13

It should be available in the online updater now.

#14

Great. All tested. Bangai-O runs perfectly now. Naomi games seem to get sprite corruption on Zero 2 Upper, still runs just odd textures around the character models.

#15

Seems to cause graphical corruption on Alpha 3 on the Dreamcast too.