Migrate Texture To Texture mask for existing brushes #96708
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Reference: blender/blender#96708
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Texture painting brush uses two textures:
brush.mtex
)brush.mask_mtex
)Sculpt/Vertex painting only supports a single mask.
brush.mtex
)This is confusing when we combine the texture painting and vertex painting in the same mode.
Cleanups to be done:
BKE_brush_sample_tex_3d
currently only uses mtex, perhaps a reason why sculpt is using mtex as mask_tex. masktex only has a 2d variant.Approach
After doing some prototypes and detecting the different viewpoints about mtex by different developers, I was researching a solution that could sanitize this issue. Sanitation is required due to:
mtex
for masking. Newly created brushes that could benefit from color masks are hard to implement in a maintainable fashion.Main idea is that all functions that access mtex/mask_mtex would access it via a wrapper.
Different tools/modes would then be responsible to create and fill this struct.
Specific implementations would only access the mask via the wrapper that is suitable for the functionality.
For example
SCULPT_brush_strength_factor
should passMTextAccessor::mask
to theBKE_brush_sample_tex_3d
.After this is done we could migrate per mode/tool to the actual brush mtex attribute that is designed for it.
Changed status from 'Needs Triage' to: 'Confirmed'
Added subscriber: @Jeroen-Bakker