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SmokeMonsterPacks / Mega-Sg-Jailbreak

Custom "Jailbreak" firmware for the Analogue Mega Sg
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Game Gear 4:3 width presets incorrect #11

Closed kingpost closed 1 year ago

kingpost commented 5 years ago

In jailbreak 7.3 using the Game Gear core, the width presets for "4:3 for 16:9" are not correct.

Here are the values they should be for each height preset:

Height | 4:3 Width
5.0x      960
5.5x     1056
6.0x     1152
6.5x     1248
7.0x     1344
7.5x     1440
frederic-mahe commented 5 years ago

The Game Gear resolution is 160 ×144. I think you are applying the following formula:

height = 144 multiplier 4/3

It seems to me that formula is valid only for the width, not the height, but I might be wrong. Could someone please confirm this?

kingpost commented 5 years ago

I'm specifically discussing the width values, not height. The existing presets for width labeled "4:3" are not 4:3 at all, but more like 13:9.

For example, for 7.0x height, the 4:3 width preset is 1456. 1456/1008 = 13:9 or 1.44:1.

kingpost commented 5 years ago

Mr. Mahe, is there any other confirmation you need? Please note I have reaffirmed the issue is with the "4:3" horizontal/width presets, not the height. Thanks.

frederic-mahe commented 5 years ago

@kingpost I need another Mega Sg user to confirm your observations so I can tag this issue as a bug. But don't worry, tagged or not, all open issues are considered when preparing a new firmware release.

frederic-mahe commented 5 years ago

Somewhat related to your issue @kingpost , FirebrandX has posted a video on that topic. He says that the correct values for Game Gear at 7.0x are 1310 by 1008 px (see https://youtu.be/dzVu05ACVhc?t=2890), corresponding to "square pixels", and the closest you can get to the actual ratio of a Game Gear screen.

Brianvgplayer commented 5 years ago

Firebrand X later suggested 1344x1008 for GG instead of 1310x1008.

Firebrandx commented 4 years ago

My original preset was based on someone else's crude measurements of the Game Gear screen. However, I later found the service manual PDF, and the actual dimensions almost perfectly match 960x720 at 5x and 1344x1008 at 7x. So each integer scale should follow that graph. The OP is correct so long as the vertical scale is also honored.

zxtheproto commented 4 years ago

1428 by 1071, in my experience, fills the screen in the 1.33:1 aspect ratio without cutting off detail.

tjanas commented 1 year ago

@kingpost Please re-test with JB7.9 and if it is still an issue, open a ticket at https://github.com/analoguejb/Analogue-Mega-Sg-JB