Mame2013 core - wrong aspect

Libretro Cores
#1

Hey guys, anyone know what’s the deal with aspect ratio on mame2013 core? See here:

https://github.com/libretro/mame2013-libretro/issues/11

Would really love a fix for this :slight_smile:

#2

I believe setting the AR to ‘auto’ will spit out whatever the core reports with square pixels. If you want it to stretch to 4:3, you’ll need to select that AR.

#3

Yeah but the bug is valid I guess, the core may be reporting the wrong AR or something neogeo games look squished

#4

maybe squarepusher can point me how to handle this properly , in 2003 RA is set like : (float)videoConfig.aspect_x / (float)videoConfig.aspect_y in 2013 i hard-coded 4/3 because i don’t know how to change this after emulation start.

like by changing game by the mame osd how to re-set the correct aspect ratio (in retro_system_av_info) in other words , if i load first a 640480 games , then change after with osd for a 320224 games ,how to change geometry.aspect_ratio ?

Edit : gkranis fix the above issue in recents commits . only the question of above remain for me , is there a way to change this on the fly ?

#5

I’ve rebuilt with the latest commits, the aspect is still wrong :frowning:

#6

Show some screenshots of mainline MAME vs. RetroArch MAME core and some kind of explanation as to why it is “wrong” - this doesn’t help at all.

#7

I was looking for a “cycle aspect ratio” hotkey to get around this problem but there is none, right? (on the windows version)

#8

For sure , gkranis have not done a pull request yet , but is second attempt seems to works great for me.

for the story ,in their second attempt he add a co_switch tricks : switch to emu thread at the end of retro_load_game and then switch back to main thread at the end of osd_init. Seems to do the job and then core report the correct AR .

ex: with pacman (224*288) mame2013-libretro with this patch report well 3/4 (but you can also use RGUI to switch to 7/9 PAR 1:1 if you want to switch from STANDARD mode to the PIXEL ASPECT one , like official mame ).

edit : not related but he had also correct the rotation pb on certain games, by just comment the prep_retro_rotation since it’s seem the core render of mame 0151 handle this by it self.

#9

I tried this with the new fixes tonight. Now I no longer need an add on config for vertical games :). I just had to delete the manual 4:3 aspect ratio setting from my main MAME cfg file and add video_aspect_ratio_auto = “true” so games run at arcade monitor aspect. They’re rotated properly without needing video_allow_rotate = “false” too.

There is still one game I tried that needs an add on config to get the aspect right, Warrior Blade. It’s one of those dual monitor games, so I set the aspect with video_aspect_ratio = “2.666600” and in MAME’s OSD have it set to dual side by side (gapless).

Also, the nonag patch works again and now doesn’t make the loading screen look weird. Great stuff!

#10

Sorry for not including screens, but there was one in the original issue and I just thought it was obvious something wrong with the aspect. Any way the latest changes fixed it thanks a bunch guys :smiley:

#11

Great work for most games. :slight_smile:

Still some problems with multiple screens like said before. You can check Darius / Darius 2 which are triple screens (you have to activate “Triple Side by side” in Mame GUI video options).

Another question concerning vertical games (shooters or contra games): the shader effect still gets applied horizontally and makes me wonder what can be done to have vertical scanlines now. Can Retroarch automatically invert x and y for processing or do we need a modified shader?

edit: my question was quite stupid. :slight_smile: I noticed I can do “rotate 90°” in Mame, then “90° CCW” in Retroarch, makes the scanlines vertical. It would be nice to have this done automatically.