Solving the No context is current Error in Your LWJGL 3 Game Development

Описание: Discover why you encounter the `No context is current or a function that is not available in the current context was called` error in LWJGL 3. Learn the solution for setting up your OpenGL context correctly and ensuring smooth game development.
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This video is based on the question https://stackoverflow.com/q/72240452/ asked by the user 'TheAwesome98' ( https://stackoverflow.com/u/13397479/ ) and on the answer https://stackoverflow.com/a/72249012/ provided by the user 'TheAwesome98' ( https://stackoverflow.com/u/13397479/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Understanding the No context is current Error in LWJGL 3

When developing a game using LWJGL 3 (Lightweight Java Game Library), encountering errors is part of the journey. One common issue developers face is the No context is current or a function that is not available in the current context was called error. If you've stumbled upon this message, don’t worry—you're not alone, and there is a solution to this problem.

What Does This Error Mean?

This error generally means that OpenGL functions are being called without a valid OpenGL context set. This can happen in situations where the initialization sequence is not followed correctly or if a deprecated OpenGL function is being used. In your case, it seems that the method calls relevant to setting the OpenGL context are indeed present, but something is still off.

Let's examine the specific code causing the issue:

[[See Video to Reveal this Text or Code Snippet]]

The core lines to note are:

glfwMakeContextCurrent(this.window); - This sets the current OpenGL context.

GL.createCapabilities(); - Initializes the OpenGL capabilities.

Why Is This Error Occurring?

The error seems to be tied to the call of GL11.glGenLists, as indicated. The OpenGL 1.x functionality that glGenLists is a part of has been marked as deprecated, especially in the context of newer OpenGL cores. To function correctly, your program needs to leverage the core profile that OpenGL provides.

Solution: Use the GLFW OpenGL Compatibility Profile

Step 1: Change OpenGL Profile

To fix this error, your best move is to switch to using the GLFW_OPENGL_COMPAT_PROFILE. This will allow you to utilize older OpenGL functions without running into compatibility issues. Here’s how you do that:

When creating your OpenGL window using glfwCreateWindow, ensure you set the proper context attributes before making the context current.

Step 2: Code Example

Here's an example adjustment that ensures you're creating the window with the compatibility profile:

[[See Video to Reveal this Text or Code Snippet]]

Key Points in Your Code:

Ensure you set the major and minor version of OpenGL to the level you need.

Switching to GLFW_OPENGL_COMPAT_PROFILE allows the use of deprecated functions if absolutely necessary.

Conclusion

By adjusting your context creation hints to use the OpenGL compatibility profile, you should be able to resolve the No context is current error. Always remember to keep your graphics library updated for compatibility, and familiarize yourself with the modern OpenGL practices for smoother development experiences and better performance in your games.

By following this guide, you should be back on track to creating your game seamlessly using LWJGL 3. If you run into any more issues or have additional questions, feel free to reach out to the community or check the detailed documentation available online!