Скачать или смотреть Fixing the Black Screen in SDL2 OpenGL Window: Your Complete Guide

Experience the joy of OpenGL programming! This guide explains why your SDL2 OpenGL window may be black and how to fix it efficiently.
---
This video is based on the question https://stackoverflow.com/q/71865880/ asked by the user 'opfromthestart' ( https://stackoverflow.com/u/3449760/ ) and on the answer https://stackoverflow.com/a/71866453/ provided by the user 'rel' ( https://stackoverflow.com/u/5872574/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: SDL2 OpenGL Window is black

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Why is my SDL2 OpenGL Window Black?

If you’re new to OpenGL programming with SDL2, you may have encountered a frustrating issue: an OpenGL window that simply appears black without displaying your expected graphics. This is a common problem that can leave you perplexed, particularly when you expect to see an animated cube or some vibrant colors. Why does this happen, and how can you resolve it? Let's dive into the issue and break down the solution step by step.

Understanding the Problem: The Black Screen

When working with OpenGL, a few prerequisites must be satisfied before you can start rendering graphics. If you're not careful with your initialization order or missing essential calls, your rendering might not work as intended. In the case of a black screen, it usually indicates a lack of valid OpenGL context or incorrect setup.

Step-by-Step Solution to Initialize OpenGL Correctly

In order to fix the black screen issue, you should ensure that your OpenGL context is correctly initialized before any OpenGL function calls. Here's how to do that effectively:

1. Set Up Your SDL Window

First, you need to create your SDL window and OpenGL context properly. The order of these operations is crucial.

2. Update Your Initialization Order

Modify your initialization code to ensure that the OpenGL context is created before you call any OpenGL functions such as setup_opengl(). Here’s the corrected sequence:

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

3. Ensure Error Checks

After setting up the OpenGL context, it’s essential to check for errors. Adding error checks after key initialization steps can help diagnose issues as they arise.

4. Drawing the Scene

The proper initialization allows you to move on to rendering your scene correctly:

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

This loop processes events and continually redraws your scene.

Conclusion

By following the correct initialization sequence and ensuring that you are creating the OpenGL context before making any OpenGL calls, you resolve the problem of your SDL2 OpenGL window displaying a blank black screen.

This small adjustment can make all the difference in your OpenGL journey, allowing you to focus on creating and animating stunning graphics. If you follow these steps and still encounter issues, consider examining other parts of your code or checking for more specific OpenGL errors.

Start creating and rendering those beautiful cubes! Happy coding!