Add background image support with modding fallback and UI toggle#380

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Sunnyl75 wants to merge 7 commits intoMUME:masterfrom

Sunnyl75:background-overlay-layer

Commits on Jun 2, 2025

Fix GMCP newline assertion crash with fallback logic
Sunnyl75
committed
Add background image rendering with OpenGL texture; groundwork for fixing depth layering issue
Sunnyl75
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Fix: render background image without depth issues (2025-05-12)
Sunnyl75
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Add toggle for background image and sync checkbox with config on load
Sunnyl75
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Load background image using existing texture system
Sunnyl75
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Fix crash on startup due to uninitialized background texture ID
Sunnyl75
committed
Restore showBackgroundImage config setting removed during drop shadow cleanup
Sunnyl75
committed