Question 1

How to integrate RmlUi with my own rendering engine?

Accepted Answer

You need to implement the RenderInterface abstract class to handle vertices and draw commands, or use a provided backend like OpenGL 3 from the included samples. The README shows a basic example with a custom render interface in main.cpp.

Question 2

RmlUi vs libRocket, which is better for new projects?

Accepted Answer

RmlUi is a fork of libRocket with active development, bug fixes, and added features like data binding and enhanced CSS3 support (e.g., flexbox and filters). It's generally the preferred choice for new C++ UI work due to its ongoing improvements.

Question 3

Can I use RmlUi for a mobile game on Android?

Accepted Answer

Yes, RmlUi supports Android, but you'll need to handle platform-specific input and rendering, potentially using the SDL backend with touch support or implementing custom interfaces. The library's cross-platform design facilitates this.

Question 4

How to style basic elements like buttons in RmlUi?

Accepted Answer

You must define all styles in RCSS files; for instance, the window.rcss example in the README styles an input element with properties like background-color and border, as RmlUi provides no default styling.

Question 5

Does RmlUi support JavaScript or only C++?

Accepted Answer

RmlUi uses C++ for logic, but offers an optional Lua scripting plugin for simplified scripting. There's no built-in JavaScript support, keeping the library lightweight and focused on native integration.

Question 6

What's the performance impact of using data binding in RmlUi?

Accepted Answer

Data binding is efficient as it synchronizes data automatically, but complex documents with many bindings or frequent updates can affect performance. The library's lightweight design helps mitigate this, but profiling is recommended for intensive use.

RmlUi

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