The Call To The CreateRender Function Failed, Causing The X Server To Report An Error When Enabling The Event

Mar 10, 2025 by ADMIN 110 views

The Call to the CreateRender Function Failed: A Comprehensive Analysis

When working with the SDL3 library on Linux arm64, particularly on UOS computers (all Chinese hardware), developers may encounter an error when enabling events after creating a window using the X11 handle. This issue arises when attempting to create a render using the CreateRender function, which returns a pointer to the render. However, an error occurs regarding the X server when enabling events. In this article, we will delve into the details of this issue, exploring the possible causes and solutions.

The problem occurs when using SDL3 to create a form using the X11 handle on Linux arm64, specifically on UOS computers. After creating the window, the CreateRender function is called with the window and NULL as arguments. However, an error is reported by the X server when enabling events. It is essential to note that if no render is created after creating the window, there are no errors when enabling events, and event reception is normal.

Upon investigation, we found four renderers in SDL3:

opengles2: The CreateRender function returns NULL.
vulkan: The CreateRender function returns a render, but an error occurs when polling events, and the X server reports an error. Additionally, the window size cannot be reset.
gpu: The CreateRender function returns NULL.
software: The CreateRender function returns NULL.

In contrast, we found three renderers in SDL2:

OpenGL: The CreateRender function returns a render, and rendering is normal. However, there are no errors when calling poll_event, indicating that mouse events cannot be received.
opengles2: The CreateRender function returns NULL.
software: The CreateRender function returns NULL.

Based on the investigation, the possible causes of this issue are:

Renderer compatibility: The issue may be related to the compatibility of the renderer with the X server or the Linux arm64 architecture.
X server configuration: The X server configuration may be causing the error when enabling events.
SDL3 library issues: The SDL3 library may have issues with the CreateRender function or the event handling mechanism.

To resolve this issue, we can try the following solutions:

Use a different renderer: Try using a different renderer, such as the software renderer, to see if the issue persists.
Update the SDL3 library: Ensure that the SDL3 library is up-to-date, as newer versions may have fixed the issue.
Configure the X server: Check the X server configuration and adjust it as necessary to resolve the issue.
Use a different event handling mechanism: Consider using a different event handling mechanism, such as the SDL2 event handling mechanism, to see if the issue persists.

In conclusion, the call to the CreateRender function failed, causing the X server to report an error when enabling events. This issue is specific to SDL3 on Linux arm64, particularly on UOS computers. By understanding the possible causes and solutions, developers can take steps to resolve this issue and ensure smooth event handling in their applications.

For further information and discussion on this issue, please refer to the following GitHub issue:

https://github.com/libsdl-org/SDL/issues/12221

The following images are referenced in this article:

The Call to the CreateRender Function Failed: A Q&A Article

In our previous article, we explored the issue of the call to the CreateRender function failing, causing the X server to report an error when enabling events. This issue is specific to SDL3 on Linux arm64, particularly on UOS computers. In this Q&A article, we will address some of the most frequently asked questions related to this issue.

A: The cause of the issue is not yet fully understood, but it is believed to be related to the compatibility of the renderer with the X server or the Linux arm64 architecture. Additionally, the X server configuration and the SDL3 library may also be contributing factors.

A: The issue affects the following renderers in SDL3:

opengles2: The CreateRender function returns NULL.
vulkan: The CreateRender function returns a render, but an error occurs when polling events, and the X server reports an error. Additionally, the window size cannot be reset.
gpu: The CreateRender function returns NULL.
software: The CreateRender function returns NULL.

A: Yes, there are a few workarounds that can be tried:

Use a different renderer: Try using a different renderer, such as the software renderer, to see if the issue persists.
Update the SDL3 library: Ensure that the SDL3 library is up-to-date, as newer versions may have fixed the issue.
Configure the X server: Check the X server configuration and adjust it as necessary to resolve the issue.
Use a different event handling mechanism: Consider using a different event handling mechanism, such as the SDL2 event handling mechanism, to see if the issue persists.

A: Yes, this issue is specific to UOS computers, which are all Chinese hardware. However, it is possible that the issue may also occur on other Linux arm64 systems.

A: Yes, you can report this issue to the SDL3 developers by creating a new issue on the SDL3 GitHub repository. Please provide as much detail as possible, including the steps to reproduce the issue and any relevant logs or error messages.

A: No, there are no known solutions to this issue at this time. However, the SDL3 developers are actively working on resolving the issue, and a fix may be available in a future version of the library.

For further information and discussion on this issue, please refer to the following resources:

https://github.com/libsdl-org/SDL/issues/12221
SDL3 GitHub repository: https://github.com/libsdl-org/SDL

The following images are referenced in this article: