Citra (Nintendo 3DS emulator) - SBS to 3D Vision -

3D Vision fix for Citra, the Nintendo 3DS emulator. This fix converts the native SBS (side by side) 3D mode to 3D Vision, thanks to the OpenGL wrapper that Helifax made (using the "OpenGL3DVision-v10.1.Beta" 64 bit version).


Update (2020-02-07): fix updated with performance optimizations (basically, deleted unnecessary code for this fix from the files in the "StereoShaders" folder). You may see 10-20% lower GPU usage now. Still higher than not using this fix, but better than before.

Update (2019-08-17): fix updated to improve the "less than 0.5" convergence case, to not clip the screen in "Large Screen" layout. I have added hotkeys and updated some sections.


Installation of the fix
- Download this file and extract its contents in the folder where "citra-qt.exe" is, like "Citra\nightly-mingw" if you use nightly builds.
- Open the properties of the "citra-qt.exe" file and check the "Run as administrator" checkbox. Just in case, do it for the other Citra exe files. This will allow the wrapper to create a profile for the emulator.


Configuration and running games
- Preferably, use Nvidia DSR to put your desktop at 4x your native resolution to avoid the pixelation of this 3D conversion (pixels will be twice as wide due to stretching, but DSR will hide that).
- Configure the emulator 3D options, setting "Stereoscopic 3D Mode" to "Side by Side" and whatever depth you like. I prefer 100%.

- You can also choose the "Background Color" you prefer for unused screen space.

- Make sure that in the current windows (or drivers) session you have used something in 3D at least once. Sometimes OpenGL refuses to trigger 3D Vision otherwise. For example, open a 3D screenshot, put it in fullscreen, enable 3D, exit fullscreen, and enable 3D again in windowed mode.

- IMPORTANT: open two instances of Citra and play in the second one. This is necessary to make 3D Vision work.

- After that, when you are ready to launch a game, preferably put the emulator window in fullscreen.

- Launch a game, and preferably press F11 to make it completely fullscreen (the first time. For next game launches, it's preferable to let them use fullscreen directly to avoid distortion). You may need to turn on 3D manually, if the emulator doesn't trigger it automatically.

Emulator window depth

You will see the game window at screen depth as the base depth. If the game doesn't use 3D or anything, you won't need the glasses. However, I made a screen depth feature that uses convergence as a modifier. It moves only the right eye image whe you push the screen to depth (+convergence) and the left eye image when you make it pop out (-convergence), to avoid image cropping in the "Large Screen" layout.

The Nvidia convergence I set for this fix is 0.50. This puts the game window at screen depth, with the formula I use. If you reduce convergence, the screen will pop out. If you increase convergence, it will be at more depth. This last thing is useful for games that use low separation, like "The Legend of Zelda: A Link Between Worlds".

If you exceed the useable limits, the image will break and you will see how this 3D mode conversion works.

Increasing Citra separation

First make sure you don't have any emulator instance or process running. Then go to "C:\Users\YOURUSERNAME\AppData\Roaming\Citra\config", open "qt-config.ini", and edit the "factor_3d" setting to something higher than 100. The limit is 255. This way you can have a much higher separation than what the console allows.

Use it alongside pop out screen (see the section above) to make the game will effectively have more convergence, compensating the maximum separation of the infinite plane. At the cost of changing the depth of the HUD.

Touchscreen

The emulator expects you to click on the original squished touchscreen. However, due to this conversion, the screen won't have the same shape, so the ingame buttons you'll try to press won't be where you think they should be.

Hotkeys (not the numpad)

- 1: default convergence, 0.5. This puts the emulator screens at screen depth.

- 2 to 5: different pop out presets, from more pop out to less pop out.

- 6 to 0: different presets that push the screens to depth, from less to more.

Warning

In my experience, you can only play one game in one emulator session. If you want to play another game, close the emulator and open it again.

If a game can't be played in 3D on the real Nintendo 3DS, it can't be played in 3D at all. At most you can push the flat image to depth, if you like it.

For those interested in how I did this

To make this conversion, I needed to modify the "StereoShaders\stereo_frag.c" file. They are a few lines of code starting from line 60 ("//SBS to 3D Vision."). If you need to flip the eyes, just change the content of those "if/else" conditions.

I also changed some settings in "3DVisionWrapper.ini".