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Add screenshot FAQs

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Pk11 2021-09-18 20:22:11 -05:00
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@ -46,3 +46,17 @@ Your cheat probably uses that type. It is not a fault of the cheat database, but
For more info on cheats, check the [Action Replay cheats section of the Retail ROMs page](https://wiki.ds-homebrew.com/ds-index/retail-roms#action-replay-cheats).
#### How do I take screenshots?
You can take screenshots of the main screen from the in-game menu. By default the in-game menu is opened by pressing <kbd class="l">L</kbd> + <kbd>Down</kbd> + <kbd>SELECT</kbd>, then select `Screenshot...`, change the VRAM bank if needed, and press <kbd class="face">A</kbd> to save the screenshot.
To view your screenshots on your PC you will need to extract `sd:/_nds/nds-bootstrap/screenshots.tar`, inside will be all of your screenshots in BMP format. There will also be additional empty BMP files to pad the TAR file out to 50, these can simply be ignored or deleted.
nds-bootstrap can only fit 50 screenshots in the `screenshots.tar`, so once you're getting close you should extract them and delete the TAR, nds-bootstrap will then generate a new TAR next time you load a game.
#### What is the main screen and why can only it have screenshots?
The "main" screen is whichever screen is being drawn using the main engine, which can be either physical screen. Typically it's the screen where the main gameplay is happening and if one screen has 3D that's always the main screen. It'll always be the top screen when in the in-game menu.
The reason screenshots can only be taken of the main screen is a hardware limitation of the Nintendo DS, it doesn't have a framebuffer but it does have a display capture feature which allows main engine's output to be captured. This is most often used by games to render 3D to both screens but can also be used to take screenshots.
#### What is the "VRAM bank" I'm asked to select when taking a screenshot?
When taking a screenshot using nds-bootstrap it needs to use the DS's display capture feature to capture a frame from the main engine, however this display capture can only write to VRAM and requires one of the first four banks. nds-bootstrap will try to select a bank that isn't being used for the main engine so usually you can simply ignore this, however in some case all four of the possible VRAM banks will be in use for the main engine and thus it's not possible to take a perfect screenshot and you will need to select the bank you find looks best.