Improve 2D Particle Emission Mask dialog #101165
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In this PR I reworked the 2D particles emission mask dialog (C/GPUParticles2D → Load Emission Mask in the 2D viewport).
Screencast.From.2025-01-05.23-34-47.mp4
Before, it was only possible to let Godot generate an emission direction texture when using the "Directed Border Pixels" mode. With this PR, you can specify a custom normal map to use. Additionally, the "Centered" checkbox is now checked by default because all other emission shapes are also centered by default.
I refactored some code as well because I found some parts of it hard to read and understand due to undocumented abbreviations.
If you want to test this, make sure to also merge #101162 because emission mask textures are currently broken for GPUParticles2D.