Blender Git Loki

install_deps: update libraries versions.

- FFMPEG: 4.3.2
- OpenSubDiv: 3.4.3
- OpenXR SDK: 1.0.8
- Switch form SDL 1.2 to SDL 2.0

Re T77035, T77007, T77010 and T77011

Merge branch 'master' into tmp-widget-opti

# Conflicts:
# source/blender/gpu/shaders/gpu_shader_2D_widget_base_vert.glsl

Fix GL_TEXTURE_MAX_ANISOTROPY_EXT not being optional

Cleanup: typo

Merge branch 'master' into tmp-texture-sampler

Cleanup: GPU: Remove uneeded texture bind for texture sampling parameters

GPU: Texture: Enable support for multiple texture units bind.

This makes possible to bind a texture up to GPU_TEX_MAX_BIND texture units.
Multiple binds can be useful to sample a texture using different sampler
state.

GPU: Texture: Avoid using anisotropic filtering on all textures.

This limits anisotropic filtering to image textures (comming from
GPU_texture_from_bindcode).

GPU: Draw: Move filter parameters to sampler_state.

GPU: Texture: Replace internal sampler state by explicit state object

This is closer to vulkan design and allow for easier state management in
the future. For instance, adding the ability to bind the texture twice
with different sampler params.

Merge remote-tracking branch 'origin/blender-v2.83-release'

Fix T76897: Lamp Power Not Updating from Driver

Lamps were not tagged with `ID_RECALC_SHADING` when they were updated
from drivers. As a result, Cycles considered the lamp as unchanged. This
is resolved by having a (seemingly non-functional) callback in a new
`LIGHT_UPDATE` depsgraph node.

This patch unconditionally adds the `LIGHT_UPDATE` node + the relation
from the lamp's PARAMETERS node.

Differential Revision: https://developer.blender.org/D7822

Reviewed by: brecht

Fix crash when converting BMesh to Mesh with shape keys

The `BM_mesh_bm_to_me()` function copies shape keys from the BMesh to
the Mesh. However, it tries to copy the same number of shape keys as are
defined on the target mesh. Since the target mesh does not necessarily
have the same number of shape keys as the BMesh, this would crash if the
target Mesh has more.

Found while performing some tests for {D7785}.

Differential Revision: https://developer.blender.org/D7818

Reviewed by: brecht

Merge branch 'blender-v2.83-release'

Fix T77031: Blender as pymodule crashes when rendering

No longer enforce WITH_HEADLESS when building as a Python module
as it disables GPU access which is needed for rendering.

Merge branch 'blender-v2.83-release'

Merge branch 'blender-v2.83-release'

Cleanup: make format

CMake: disable WITH_USD with blender_lite configurations

Py Docs: Update Sphinx and Theme Dependencies

`sphinx_rtd_theme==0.5.0rc1` probably should not be used for 2.83 but it
would be nice to test