Blender Git Loki

USD: cmake capital NOT required

USD: build without USD if library cannot be found

support nicer drawing of sockets

new Multi Execute node

prevent trails and explosion in a the same particle system

remove unused code

Merge branch 'master' into functions

Merge branch 'greasepencil-object' into greasepencil-refactor

Merge branch 'master' into greasepencil-object

GPencil: Refactor: Speedup: Only blend pixels rendered in the layer

GPencil: Refactor: Implement Layer Masking

GPencil: Refactor: Fix Overlay Blend mode

There was a mistake in the implementation. The step were reversed and
alpha was affecting the blend result.

GPencil: Refactor: Add depth merge pass

This pass merge the stroke depth to the 3D depth buffer. This makes GP objs
to mask overlays correctly.

2D objects depth is using the object center depth only. This is to be
improved.

Cleanup: GPencil: CamelCase for uniforms

GPU: Framebuffer: Fix missing color mask

GPencil: Refactor: Fix 3D stroke offset

The offset was way too big.

GPencil: Refactor: Add depth test in the fragment shader

Now the GPencil object can correctly intersect the scene.

Previously (old implementation) 2D GPencil objects would poke through
in front meshes in certain situations (depending on stroke order). This is
now fixed.

This does not fix the intersection with the overlays.

GPencil: Refactor: Fix overlay blending math

A sign error in optimized code.

fix: find IDs used by output sockets as well

GPU: Texture: Fix mistake in format classification

sRGBA format is well defined for use with framebuffers (based on 3.3 spec).