Blender Git Loki

Gawain: rename AttribBinding clear for consistency

AttribBinding is only used internally by Gawain.

Part of T51219

Fix missing manipulator update after undo

Steps to recreate the error were:
* Enter edit mode
* Change Vertex positions
* Undo -> Manipulator position isn't updated

Cleanup: lattice drawing had mesh include & names

Cleanup: GPU header guards

GPU matrix: add back type checks

Without this gpuGet functions would cast everything
(no type or size checks and override const variables).

Remove redundant declaration

Fix T51149: Joining curves allows 2D curves in 3D

Object.raycast: error in previous commit

This is taking longer than I expected.

GPU Matrix API: clean up after 2D-3D unification

See GPU_matrix.h & gpu_matrix.c for the important changes. Other files are mostly just updated to use the latest API.

- remove unused functions, defines, enums, comments
- remove "3D" from function names
- init to Identity transform (otherwise empty stack)
- gpuMatrixReset lets outside code return to initial state

Part of T49450
Follow up to D2626 and 49fc9cff3b90

Fix: Object.raycast: error to free treedata

Object.raycast: Also test distance from BoundBox

If `isect_ray_aabb_v3_simple` provides this information, why not take advantage of it?

Cleanup: Use doxy-groups for draw-cache

Cleanup: explicit names for return arguments and position last

Object.raycast: Test the hit on the BoundBox first

This avoids the unnecessary creation of bvhtree, which can be highly inefficient in some cases
(for example: in the `operator_modal_view3d_raycast.py` template)

Fix Player stubs (tm)

Fix T51216: SSAO attenuation not being scale invariant.

Unfortunately this does break compatibility in that the viewport will look a
bit different depending on the settings, but the old behavior was simply not
usable for higher distances.

Alembic import: fixed dupligroup export when the dupli-empty has a parent

Alembic export: fixed flattened dupligroup import

GPU Matrix API: Remove ModelView/Projection 3D suffix

GPU Matrix API refactor: Stick to a single 4x4 stack for 2D and 3D

* Brings us closer to core profile, all matrices are working, and apart
from a problem with text drawing, Blender is working fine.

* Reduce the coding overhead of having to setup/teardown when
alternating between 2D and 3D drawing sessions.

* Gives us fewer modes and states we need to keep track of.

Unfortunatelly this also "rejects a fundamental change" the original
design was trying to make - that 2D is different from 3D and
deserves its own best implementation.

That said, it is still aligned with the function API design as
originally implemented (i.e., it still uses gpuTranslate2D, ...).

Finally, if you build with core profile and this patch you get:
https://developer.blender.org/F545352

[The text glitch is an unrelated issue].

Reviewers: merwin, sergey, brecht

Differential Revision: https://developer.blender.org/D2626