How to Set Up CRT Shaders in RetroArch

This guide walks you through the process of enabling and configuring CRT shaders within RetroArch to replicate the authentic look of classic televisions. You will learn how to access the shader menu, load popular preset packs like CRT Royale or Guest, and adjust specific parameters such as scanline intensity and screen curvature. By following these steps, you can enhance your retro gaming experience with minimal performance impact on most modern hardware.

Accessing the Shader Menu

To begin, load any core and content within RetroArch. Once the game is running, open the Quick Menu by pressing the designated hotkey combination, typically F1 on keyboard or Select plus X on a controller. Navigate down to the Shaders option and select it. Ensure that the Video Shaders switch is toggled to On. If this switch remains off, no visual effects will be applied regardless of your other settings.

Loading a CRT Preset

Inside the Shaders menu, select Load Preset. You will see a list of directories containing shader files. For a CRT effect, look for folders named crt, crt-guest, or crt-royale. Select a preset file ending in .slangp or .glslp depending on your video driver. Slang shaders are generally recommended for modern hardware as they offer better performance and visual fidelity. Once selected, the screen should immediately update to reflect the scanlines and phosphor glow of a simulated cathode ray tube.

Fine-Tuning Parameters

After loading a preset, you may want to customize the look. Return to the main Shaders menu and select Parameters. Here you can adjust individual settings such as Scanline Intensity, Bloom, and Curvature. Increasing the curvature adds a realistic bend to the edges of the screen, while adjusting the bloom controls the glow around bright objects. Take your time to tweak these values until the image matches your preference without obscuring game details.

Saving the Configuration

To avoid repeating this process every time you launch a game, you must save your configuration. Go back to the main Shaders menu and select Save Preset. Choose Save Core Preset to apply these shaders to all games running on the current emulator core. Alternatively, select Save Game Preset to apply the effect only to the specific title you are currently playing. This ensures your preferred CRT look is automatically loaded in the future.

Performance Considerations

CRT shaders can be demanding on system resources, particularly on low-powered devices like the Raspberry Pi or older smartphones. If you experience frame rate drops or audio stuttering, try switching to a simpler shader preset. Shaders labeled as lightweight or those using the glsl format instead of slang often require less processing power. Balancing visual authenticity with smooth performance is key to maintaining a playable retro gaming environment.