Integrate RmlUi

[p2004a]

Main RmlUi integration PR into engine. It is replacing https://github.com/beyond-all-reason/spring/pull/1076 and https://github.com/beyond-all-reason/spring/pull/1304.

To contribute to this work, please open separate PRs with clean git history into https://github.com/beyond-all-reason/spring/tree/rmlui-integration branch.

The branch is rebased on top of the stable BAR engine release version.

We will be periodically making Game Dev facing preview builds, and those are available in BAR launcher as "Engine RmlUi", latest: https://github.com/beyond-all-reason/spring/releases/tag/rmlui-integration-preview-v5

so they can test functionality and API before it fully lands into engine.

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This description will be rewritten focusing on the summary of changes when we get close to merging.

[blaisemccourtney]

In case it is of help to anyone, RmlUi's main documentation: https://mikke89.github.io/RmlUiDoc/ .

[ChrisFloofyKitsune]

PR to clean up whitespaces

• 1418

[ChrisFloofyKitsune]

PR to push forward the "this could be a standalone change" stuff

• 1419

[ChrisFloofyKitsune]

Note that this needs done:

Implement the RmlUi font interface

https://mikke89.github.io/RmlUiDoc/pages/cpp_manual/interfaces/font_engine.html This will allow the RmlUI library to not link to FreeType as a dependency

[blaisemccourtney]

What does BAR usually use to draw text with? Or does it use its own internal FreeType dependency?

For anyone looking at implenting the RmlUi font interface, there are some samples for implementing a Rml::FontEngineInterface in RmlUi's repository:

• Using bitmaps: https://github.com/mikke89/RmlUi/tree/559d84ab274b8e480d9106f17602d439bf759b0e/Samples/basic/bitmapfont/src .
• Using HarfBuzz and FreeType: https://github.com/mikke89/RmlUi/tree/559d84ab274b8e480d9106f17602d439bf759b0e/Samples/basic/harfbuzzshaping/src .

RmlUi's default implementation for font handling, including FreeType: https://github.com/mikke89/RmlUi/tree/559d84ab274b8e480d9106f17602d439bf759b0e/Source/Core/FontEngineDefault .

[ChrisFloofyKitsune]

What does BAR usually use to draw text with? Or does it use its own internal FreeType dependency?

... \<snip>

BAR uses it's own FreeType dependency Thank you for the links, I'll probably be needing those later

[ChrisFloofyKitsune]

another batch of clean up changes and a bugfix

• 1427

[p2004a]

This will allow the RmlUI library to not link to FreeType as a dependency

Engine already links to freetype so that doesn't matter.

[blaisemccourtney]

I wonder, should a click inside one widget "fall through" to a different widget that is visually "beneath" (z-level) and overlapping the first widget? I don't know BAR well, but in many UI systems, a click doesn't "fall through" like that. EDIT: Is this question relevant for BAR? I don't know BAR well enough to answer that.

[sprunk]

that should be for the widget to specify (you could put a panel covering any empty space to absorb clicks)

[ChrisFloofyKitsune]

PR for README + License issues in /Rml/SolLua folder

• 1431

[ChrisFloofyKitsune]

improvement to \<texture> custom element

• 1440

https://discord.com/channels/549281623154229250/1228831114143993896/1228950232587305003

[ChrisFloofyKitsune]

another round of fixes

• 1457

[lhog]

Folks, is this the PR you want to merge to the main line?

[p2004a]

Yes @lhog this is the main RMLUI integration PR worked by @ChrisFloofyKitsune