4b4ed8bccc
For paint modes the selection and visibility were encoded in in the W component of the normals. Separating the normals into a separate vertex buffer, though it increases memory usage a bit in those paint modes, means the status doesn't need to be computed outside of paint modes, and the whole system becomes less convoluted and easier to optimize. The particular optimization I have in mind is better caching of vertex buffers, which gets much more complicated when the normals VBO contains data like selection and visibility and depends on the paint mode. Internally, a there are now three mesh draw batches that are specific to the paint overlay. The GPU subdivision normals buffer is now just three components rather than 4 components. Pull Request: https://projects.blender.org/blender/blender/pulls/140156
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