Blender Git Commits

Cleanup: Update comments to follow coding style

https://wiki.blender.org/wiki/Style_Guide/C_Cpp#Comments

Blender v2.93.2 candidate version bump.

Merge branch 'master' into soc-2021-vse-strip-thumbnails

fix

Cleanup: Added license headers.

Merge remote-tracking branch 'origin/master' into lineart-bvh

Added shader compiler abstration.

The shader_compiler is an abstration layer for in case we need to switch
between other shader compilers in the future.

The shader compiler uses a CPP Api as it will only be accessed from GPU
module.

```
const char *source = "#version 450nvoid main() {}";
shader_compiler::Compiler *compiler = shader_compiler::Compiler::create_default();
shader_compiler::Job job;
job.source = source;
job.name = __func__;
job.source_type = shader_compiler::SourceType::GlslComputeShader;
job.compilation_target = shader_compiler::TargetType::SpirV;

shader_compiler::Result *result = compiler->compile(job);
EXPECT_EQ(result->type, shader_compiler::TargetType::SpirV);
EXPECT_EQ(result->status_code, shader_compiler::StatusCode::Ok);
EXPECT_GT(result->bin.size(), 0);
EXPECT_EQ(result->error_log, "");
delete result;
delete compiler;
```

The CMakeFiles need some attention as it currently works when linking to
the shaderlib_combined. On linux it picks up the shaderlib from the
vulkan SDK, eventually it needs to pick up from our prebuild libraries.

Merge branch 'master' into temp-attribute-processor

Merge branch 'master' into xr-controller-support

XR: Add fly navigation operator

Navigates the scene by moving/turning relative to navigation space
or the XR viewer/controller. Users can select from a variety of
these modes as well as specify the min/max speed and whether to lock
elevation.

Also: pass float threshold to XR action events.

XR: Update controller data again in viewer update

This is needed to draw the controllers with correct transforms in the
event that an operator changed the navigation.

Merge branch 'master' into soc-2021-knife-tools

Knife: Added visible distance and angle measurements

Pressing M while using the knife tool will now cycle through showing various measurements related to the current cut.

The different modes are:
Just Distance - Shows the length of the current cut segment
Just Angles - If the cut segment is touching any edges the corresponding angle is displayed
Both - Shows both distance and angles

Merge branch 'master' into asset-browser-poselib

LineArt: Versioning for smooth surface crease.

adaptive_cloth: mesh: abstract out read over MeshReader and fix compiler errors

LineArt: Remove auto smooth for crease.

LineArt: Mark sharp as crease.

LineArt: Update deps for selecting camera/light

LineArt: Use Smooth/AutoSmooth for crease.