Graphics Glitches After Enabling Hardware Shader
Many Citra MMJ users turn on Hardware Shaders with the expectation that it will increase frame rates so they can enjoy their games more. But sometimes, things go the other way. After enabling this setting, frame rates drop, weird texture bugs appear, or even the graphics disappear completely, leaving you with only a black screen. If this also happens to you, then don’t worry. This is a common issue on some Android devices, and there’s a simple reason behind it.
Hardware shaders are small programs executed by the GPU that reduce CPU load by performing many shader calculations themselves. The CPU no longer has to emulate or process those shader calculations in software. Instead, the GPU handles this graphical work faster than the CPU.
With reduced CPU load and faster GPU graphics execution, performance improves, frame rates become higher, and stutters are reduced on high-end devices.
However, on some older or low-end devices, due to GPU or graphics driver limitations, turning on this setting can cause graphical glitches and lower performance.
After enabling Hardware Shaders, it is quite normal for the game to stutter for a while. During this time, Citra MMJ compiles new shaders, which can cause temporary frame drops and small stutters. However, once the shaders are compiled, the game becomes stable. If the game continues to stutter or starts showing graphical glitches, then follow the troubleshooting methods below.
The Game Is Incompatible with Your Phone’s GPU
The most common reason a game starts glitching after enabling Hardware Shaders is that the game is not fully compatible with your phone’s GPU. Some Nintendo 3DS games use special graphic effects that don’t work well with Hardware Shaders on certain Android devices.
Hardware Shaders work best on powerful phones. If your phone has a fast GPU, games usually run without any problems. But if you are using an older or low-end phone, the GPU may not be able to handle some graphics properly. As a result, you may see glitches such as flickering, missing textures, or a black screen.
Another reason is that different Android phones use different GPUs. So, one game may run perfectly on one device but show graphical glitches on another device after Hardware Shaders are enabled.
Because of incompatibility between the game and your device’s GPU, you may experience one or more of the following issues:
- Flickering screen
- Missing or invisible textures
- Broken or distorted 3D models
- Random colorful shapes on the screen
- Characters missing arms, legs, or other body parts
- Whole areas of the map disappearing
- A completely black screen
None of this means that your phone is too weak or that the emulator is broken. It’s simply a compatibility issue between the game, your GPU, and the Hardware Shaders setting.
Fix
Turn off Hardware Shaders from the Citra MMJ Graphics settings and restart the game.
If the game runs stably without any graphical glitches, then it means that your phone’s GPU is not handling that game’s shader effects properly. If you want to play that game on your device, then it’s better to play it with the Hardware Shaders setting turned off (while being ready to sacrifice some frame rates).
Also, prefer using a mid-to-high-end phone if you want to play games with improved frame rates by using this feature.
The Setting Has Not Been Fully Applied Yet
When you enable Hardware Shaders while the game is running, it changes the graphics settings, and the emulator has to reload all the game graphics and compile a new shader cache according to the new graphics settings. This process does not happen correctly while the game is running. Therefore, it is necessary to restart the game so that the emulator can load everything properly from the beginning.
Fix
So, if you turned on this setting during gameplay, then:
- Completely close Citra MMJ.
- Reopen the emulator.
- Launch the game again.
The emulator reloads all textures and shaders correctly, and in many cases, the graphical glitches disappear.
An Outdated or Corrupted Shader Cache
When you turn on the Hardware Shaders setting for any game, the emulator compiles new shaders and stores them in the shader cache folder so that it doesn’t have to recompile the same shaders every time you play that game.
Every game has its own shader cache.
However, when you change some graphics settings or update Citra MMJ, the shader cache may become outdated or corrupted, which can cause visual bugs.
Fix
Locate and delete the shader cache in the Citra MMJ internal folder, then launch the game again. The emulator will automatically rebuild a fresh shader cache.
Texture Filtering Is Conflicting with Hardware Shaders
For some games, Texture Filtering conflicts with Hardware Shaders. If you turn on both settings together, then they may cause graphical glitches.
Fix
- Open Graphics Settings.
- Lower the Texture Filtering setting and select from the given options.
- Restart the game.
This simple fix often works for games that only show texture problems without other graphical issues.
You’re Running an Older Version of Citra MMJ
In older versions of Citra MMJ, many graphical bugs were reported that were later fixed in newer versions. So, it’s quite possible that you are using an outdated or very early build of the Citra MMJ Android emulator and are experiencing graphical bugs because of it. The graphical bug may be specific to that particular Citra MMJ build.
Fix
Update to the latest version of Citra MMJ.
Newer versions generally include:
- Better GPU compatibility
- Improved shader rendering
- Fewer texture problems
- Better compatibility with Nintendo 3DS games
- Fewer graphical glitches
After updating, enable Hardware Shaders again and test your game.
Conclusion
Hardware Shaders is one of the most useful Citra MMJ Android features/settings. It improves shader rendering on high-end devices by moving shader processing from the CPU to the GPU, allowing Citra users to enjoy their games with better visuals and higher frame rates.
However, sometimes after enabling this setting, the game starts causing problems. This can be due to:
- A specific game being incompatible with your device’s GPU
- A corrupted shader cache
- Using an older version of Citra MMJ
- Using an older or low-end device
Try each fix one by one. Simply restarting the emulator, clearing the shader cache, updating Citra MMJ, or disabling Hardware Shaders for that particular game can solve the problem and get your game running normally again.
