Blender Git Loki

GPUBatch: Merge phase and ownership flags and cleanup there usage

Also add new flags to communicate specific behavior to future backend.

DRW: InstanceData: Remove hacks of batch freeing callback

We instead use a handle reference counter on the GPUVertBufs used by
the instancing batches. This make sure that if an update happens on the
GPUVertBuf used to contruct the batch, they will never have the same
memory address than the previously allocated ones (since they are still
pending deletion thanks to the refcounter).

This avoid the linear search to update the GPUBatch in the case a
batch is deleted (which was even a bad option since they could be only
cleared)

GPU: Use GPU_vertbuf_create & GPU_indexbuf_calloc instead of manual alloc

GPUVertBuf: Add handle refcount

A handle refcount is here to avoid freeing of the GPUVertBuf datablock
if it is still referenced somewhere else.

This does not prevent deleting the actual data. This is to avoid too
much zombie data usage.

This is in order to avoid most hacks inside `draw_instance_data.c`.

GPUBatch: Remove most use of GPU_batch_draw_advanced()

This is in order to better encapsulate / isolate the drawing code.

Cleanup: GPUBatch: Remove GL functions from uniform assignment

Cleanup: GPUBatch: Move gpu_batch_private.h to CPP header

Cleanup: GPUShader: Remove unused code

GPUShader: Change shader state tracking to be part of the GPUContext

This remove the use of batch->program and replace it with batch->shader.

This will allow GL abstraction latter.

GPUBatch: Remove usage of gl_prim_type outside of GPU module

GPUDrawList: GL backend isolation

GPencil: Make Selected as default for SVG export

Instead to use Active, it's better use Selected.

Fix T65148: Drivers can't access shape keys

It was impossible for drivers to use shape key properties, modifiers
generate a new mesh. After mesh evaluation the shape keys are no longer
necessary, and because of this the `key` pointer was not copied. As
drivers work on evaluated data, however, they do need this `key`
pointer.

This commit makes the `key` pointer available in evaluated meshes, but
this is somewhat dangerous. There was an explicit reason why the key on
result was kept at null pointer: to have the evaluated mesh in a
consistent state. Assigning this pointer makes it potentially
inconsistent, as the evaluated mesh and the original shape key may have
different topologies.

Reviewed By: sergey

Differential Revision: https://developer.blender.org/D7785

GPencil: Use Layer thickness esporting SVG polyline

GPencil: Change default SVG special groups name

This allows to skip them if the file is imported again.

Merge branch 'blender-v2.90-release'

Preferences: correct property description for keyitem restore

Spotted while checking T79657.

Reviewers: brecht

Differential Revision: https://developer.blender.org/D8517

Fix T79743: baking still uses cage object after removal

GPencil: Hide Gray Scale in SVG export

This option is only valid in Storyboards.

GPencil: Make format