Blender Git Loki

Node inputs now have a 'value type' to specify how input connections are treated.

VALUE_CONSTANT inputs can not have connections, their values are known at compile time.
bvm stores these values directly in the instruction list.

VALUE_VARIABLE inputs store values at evaluation time. bvm stores a stack index for them
which is used to load and store from/to the evaluation stack.

VALUE_FUNCTION inputs are passed to kernels to be called internally when needed.
bvm stores an instruction index and allows a jump to this instruction (TODO).

Merge branch 'master' into GPencil_Editing_Stage3

Added an 'entry point' instruction number to functions.

This is currently always 0, but will be used in the future to allow
storing per-element functions along with the main code. These can then
be called within kernels.

Enabled generic math nodes for modifier node trees.

Fix for static empty mesh variable, used as default value of meshes on the stack.

This creates a (minor) mem leak when statically creating the mesh. Instead it
should be constructed in a init/free pair of functions.

Because this variable is used in all different compile units, each of them has
to create their own global 'empty_mesh' variable.

Fixed missing delete call for unused nodes.

Free the modifier bvm function after use.

Note that eventually these should be cached to avoid unnecessary
recompilation, but for now they get compiled on every modifier eval.

Use the guardedalloc new/delete overloads for relevant classes.

Fixed overzealous assert for input stack assignments in codegen.

For constant inputs no stack index is needed. Previous to node pruning
this did not trigger the assert because there were still pass nodes
allocating the stack indices.

Node tree pruning function for removing unused nodes.

This also removes the placeholder 'pass' nodes, which were already
being skipped and made unused.

Changed node instance storage in the node graph to pointers.

This makes it much easier to optimize the graph by removing and reconnecting nodes.

BGE: Set render flag true on game start.

Fixes this bug:
1. add `logic.setRender(False)`
2. run game, exit game
3. remove the `logic.setRender` line
4. run game ... the render is still off

Now the render flag will be on by default on game start.

Note: during the game, the render flag stays unchanged across
game restart/load. It's only on initial game start that it is
initialized on.

Skip hidden widgets when updating widget size

Cleanup: Mixed code and declarations are allowed now o/

(And other cleanup)

Merge branch 'master' into id-remap

Clean up use of old OGL extensions (correction to previous commit)

Somehow managed to not include this in rB72b2de3fa6ac.

Merge branch 'master' into openvdb

Merge branch 'master' into id-remap

Merge branch 'master' into object_nodes

Conflicts:
source/blender/blenkernel/intern/softbody.c

Cleanup: Use of old OGL extensions, use `rna_enum_` prefix for RNA enums

Just to apply to latest changes in master.