Blender Git Loki

OpenSubdiv: Add regression tests for mesh topology

While this looks trivial it already allowed to catch issues in one
of previous attempt to optimize memory usage. It will totally be
useful for an upcoming refactor of face topology storage.

Fix T76926: Crash with Full Screen file browser window preference

Alternative fix for T75292 & T73579 (see b75ce05c3b0f), that does not
cause this crash.

The crash happened because cancelling the file browser removes its
screen (as in bScreen). Before rBb75ce05c3b0f, the file browser event
wouldn't be handled any further then. After it, it would still be passed
to other areas, while the screen pointer was dangling.
Now the event is only skipped for UI handlers.

Reviewed by: Julian Eisel

Curves: Implement Handles for selected points only

When editing a complex curve is very annoying to have all handles at a time. Also, this is a requirement for the current GSoC Edit Grease Pencil using curves.
I have seen that this improvement can be used in any other area of blender, so I have decided to publish the option in the overlay panel..

Reviewed By: fclem, #user_interface, billreynish, Severin

Differential Revision: https://developer.blender.org/D7754

OpenSubdiv: Hide individual topology elements

Move all API to happen via MeshTopology.

This is a preparation for an upcoming memory optimization.

OpenSubdiv: Cleanup, remove unused code

There is no need in edge map anymore.

OpenSubdiv: Add TODO avoid checking face-varying topology for equality

OpenSubdiv: Move preliminary geometry counters check to mesh topology

OpenSubdiv: Keep explicit storage of base mesh faces

Allows to perform comparison by doing linear comparison of indices.

Before cyclic match was used to deal with possibly changed winding from
OpenSubdiv side.

Speeds up comparison (and hence improves FPS), makes code more reliable
nut uses more memory.

OpenSubdiv: Compare edge topology

This change makes it so topology refiner comparison will check vertices
of all existing/provided edges.

The initial claim that due to manifold nature of mesh there is no need
in "deep" edges check was wrong: some areas might only provide edges
with non-zero creases. So if crease of one edge goes changes from 1.0
to 0.0 and crease of other edge goes from 0.0 to 1.0 the old comparison
code would not have caught it.

OpenSubdiv: Refactor, move mesh topology comparison to own file

Makes it easier to follow and extend.

OpenSubdiv: Use explicit storage for edge sharpness

Similar to previous change in vertex sharpness, explicitly store value
provided by the converter.

Allows to avoid rather fragile check for boundary edges.

Also allows to avoid need in constructing edge map. This lowers memory
footprint of the comparison process and avoids memory allocations
during the comparison (which is an extra benefit from the performance
point of view).

OpenSubdiv: Allow use of regular ordered map

OpenSubdiv: Refactor, move comparison to own file

OpenSubdiv: Compare sharpness based on converter

This change starts the transition of topology refiner comparison
to compare actual values given by the converter, which will not be
affected by the refinement or face winding synchronization steps.

Currently is only implemented for vertex sharpness, but will be
extended further as followup development.

Fixes T71908: Subdiv: Incorrect topology comparison, leading to poor performance

OpenSubdiv: Add explicit storage for mesh topology

The idea is to use this explicit storage for topology comparison rather
than using base level. While this will have memory overhead it allows
to simplify comparison of such things as:

- Vertex sharpness (where base level from topology refiner will have it
refined, meaning it will be different from what application requested
for non-manifold and corner vertices).

- It will allow to simplify face-vertices comparison, where currently
O(N^2) algorithm is used due to possible difference in face winding.

- It will also allow to avoid comparison-time allocation of edge map.

Currently no functional changes, just preparing for development which
will happen next.

OpenSubdiv: Add move semantic to the namespace

OpenSubdiv: Refactor, pass higher level object through comparison

OpenSubdiv: Refactor, move utils to base

Also split them across utilities and types.

OpenSubdiv: Refactor, move base C-API file to base folder

OpenSubdiv: Cleanup, use C++ range based loop

Avoid indirection via define.