Godot vs. libGDX: Surprising results!

Introduction

This tutorial explores the performance differences between Godot and libGDX while migrating a game from libGDX to Godot Kotlin/JVM. The results show that the Godot version runs 40% faster. This guide will walk you through the key steps of the migration process, highlight the advantages of using Godot, and provide insights from the comparison.

Step 1: Understanding the Game Environment

Before starting the migration, it's important to set up the development environment correctly.

• Hardware Specifications:
  • CPU: Ryzen 5 5500
  • GPU: RTX 3050
  • RAM: 32GB
  • OS: Windows 11
• Game Specs:
  • 300 instanced KayKit skeletons
  • 8192x8192 single shadow map
  • Both versions written in Java

Step 2: Setting Up Godot Kotlin/JVM

To migrate your game to Godot, follow these steps to set up the Godot Kotlin/JVM environment.

1. Download Godot:

   • Visit the Godot website and download the latest version of Godot Kotlin/JVM (v4.3).

2. Install Godot:

   • Follow the installation instructions specific to your operating system.

3. Configure Kotlin:

   • Ensure that you have the Kotlin plugin installed in Godot for Java compatibility.

Step 3: Migrating Code from libGDX to Godot

The migration process involves transferring the game code and assets.

• Extract Assets:

  • Gather all game assets (images, sounds, etc.) from your libGDX project.

• Code Migration:

  • Rewrite the game logic in Godot using Kotlin. This may involve adapting some functions to align with Godot's architecture.

• Example Code Snippet:

  class MyGame : Node() {
      fun _ready() {
          // Initialize game objects here
      }
  }
  

Step 4: Performance Optimization

After migrating your game, optimize it for better performance.

• Profile Your Game:

  • Use Godot's built-in profiling tools to monitor performance metrics.

• Adjust Settings:

  • Fine-tune settings such as shadow maps and instancing options to maximize FPS.

Step 5: Testing and Comparison

After completing the migration and optimization, it's essential to test both versions of the game.

1. Run the libGDX Version:

   • Test the libGDX game version in a browser by visiting this link.

2. Run the Godot Version:

   • Play the Godot version to assess frame rates and overall performance.

3. Compare Results:

   • Record FPS:
     • Godot average: 500 FPS
     • libGDX average: 350-355 FPS
   • Analyze the differences to understand the benefits of using Godot.

Conclusion

Migrating a game from libGDX to Godot Kotlin/JVM can yield significant performance benefits, as evidenced by the 40% increase in FPS. By following the outlined steps, developers can effectively transition their projects, taking advantage of Godot's capabilities. For next steps, consider exploring additional optimizations in Godot or experimenting with other features to enhance your game further.