Viewing Issue Advanced Details
|ID||Category [?]||Severity [?]||Reproducibility||Date Submitted||Last Update|
|06863||Graphics||Minor||Always||Feb 2, 2018, 11:21||Feb 12, 2018, 21:40|
|Tester||wuemura||View Status||Public||Platform||MAME (Official Binary)|
|Assigned To||Resolution||Open||OS||Windows 10 (64-bit)|
|Version||0.194||Fixed in Version||Build||64-bit|
|Summary||06863: vr: Video mode don't work|
|Description||Changing video mode from 16:9 to 4:3 does nothing.|
|Steps To Reproduce||Start emulation, press F2, change the setting|
|Additional Information||Can't test with other clones or model1 machines.|
|Affected Sets / Systems||vr|
mamedar.png (24,950 bytes) Feb 2, 2018, 21:52 Uploaded by wuemura
4:3 > 16:9
VR-arcade.jpg (169,576 bytes) Feb 4, 2018, 15:39 Uploaded by wuemura
vr-flier-wide.png (55,849 bytes) Feb 4, 2018, 16:23 Uploaded by wuemura
Correct DAR flyer source
vr-flier-wide2.png (52,301 bytes) Feb 4, 2018, 16:24 Uploaded by wuemura
Correct DAR flyer source
|There are no relationship linked to this issue.|
Feb 2, 2018, 13:29
|Are you sure this is a 'major' issue?|
Feb 2, 2018, 15:19
where is the option in vf?
it definitely works in vr, although you need to change the layout MAME uses to a 4:3 one to match the test mode setting if you select 4:3 (otherwise everything looks stretched with the default 16:9 layout)
Feb 2, 2018, 21:51
edited on: Feb 3, 2018, 12:47
The options is located at:
F2 > Game System > Monitor
Still, the reverse also doesn't work, if you set mame DAR to 4:3 and vr to 16:9 the screen are not adjusted properly.
If we set vr DAR to 4:3 and MAME to 16:9 keeping the screen proportions, you should see something like the screenshot, black bars on the side or cropped, none of this happens.
This are the calculations used with avisynth to generate that image:
function PadHeight(clip image, int width, int height, int AR_WIDTH, int AR_HEIGHT)
Feb 4, 2018, 15:39
Adding the VR arcade flyer from
Feb 4, 2018, 16:48
Using the arcade flyer as a reference, i've made a few samples using the same script above to create the same fake "wide" but keeping everything else in the correct proportion and aspect ratio. Note the red sign proportion is the same in the flyer, the same for the car. At the car doing a curve shot, the windmill, the car chassis, the tires, everything match proportion like the arcade flyer.
Looks like the machine can't do a real 16:9 aspect ratio because the video output has square pixels, so setting the "AR_WIDTH" and "AR_HEIGHT" to the correct ratio that is 4:3 DAR, we can use any wide resolution to create the exact same look the arcade does, that is moving from 640x480 to 720x480, I set the image to 1280x720 to extract a bigger image for illustration.
Mame show that this machine has a video of 496x384 @ 57.524160, 496x384 return a SAR of 1,25380710659898, PAR of 8,31744545659019
and a DAR of 247:197, it should be 4:3 unless the technical details of the hardware say otherwise.
Feb 4, 2018, 20:07
|You can't calculate the aspect ratio from the resolution, pixels aren't always square.|
Feb 4, 2018, 21:34
edited on: Feb 5, 2018, 00:20
Aspect Ratio = Width / Height
640 / 480 = 1,333333333333333
Max Common Divisor of 640 and 480 is 160.
640 / 160 = 4
480 / 160 = 3
Or a fraction of 1,333333333333333 is 4/3 or 4:3.
There are 8 pixels added to each side for padding so we can keep a 4:3 DAR portion inside our 720x480 video, 720 - 16 = 704
So 4:3 = (10*704)/(11*480) = 1,333333333333333
To check if our aspect ration is correct with the original DAR
704 * (10/11) = 640
There's online calculator that does this also:
Also we have calculations to deal with square and non-square pixel and adjust the screen accordingly, here are two examples:
640 x 480 DAR 4:3
720 x 480 DAR 4:3 stretched to 16:9 resolution, this is what the machine does to fake wide 16:9 image using the flyer as a reference, maybe it send a signal to the monitor to do this.
The point is, the machine pixels are square, changing the settings for aspect ratio does nothing to the pixels it self. If the video board sends a signal telling the display to stretch, mame screen is not reacting. Changing the aspect ratio on mame settings makes the image out of proportions.
Feb 6, 2018, 07:08
|Acknowledging for now while this is researched and figured out.|
Feb 7, 2018, 10:46
edited on: Feb 7, 2018, 10:47
the video board doesn't send a signal telling the display to stretch or anything like that, it just renders the graphics in a different way if 16:9 is selected or 4:3 is selected, it is up to you, as the operator / user to pick the correct monitor to match the configuration you've picked.
in MAME 'picking the correct' monitor means going into the display options and selecting normal/wide to match the option in service mode.
best I can tell this works fine, and as intended.. obviously if you run 16:9 in the game and have MAME set to think it has a 4:3 monitor it will look wrong (as it would on hardware) and likewise, if you set it in game to 4:3 and set MAME to 16:9 then it will look wrong, as it would on real hardware..
also, as I said in my first post, this seems to be very much a 'vr' report, not a 'vf' report.