Blender Git Loki

Removed unused codegen_begin/end functions.

Define a separate node function module for every compiler type.

This means we can have differing implementations for every potential use
of nodes, such as plain value functions vs. dual values with derivatives.

Node functions for each compiler type are stored in a static map and are
lazy-initialized on the first node graph compilation.

Pass texture arguments and return values as dual values.

Currently only the value part is actually accessed. Using dual values
allows the node graph to handle input/output arguments are single a
single llvm::Value instance.

Preparatory changes for differing node compiler implementations.

Uses some virtual functions of the node compiler to allow different
implementation of values. This will be used for calculating values
and partial derivatives in texture nodes.

Use a TypeSpec pointer for structure fields rather than direct storage.

Type system refactor: Use a global type definition map instead of defining each type locally.

Merge branch 'master' into object_nodes

Cleanup: removed some unused code.

Enable the new depsgraph by default.

The blenvm system depends on the new depsgraph, so it doesn't make sense
to have to enable it every time.

The legacy depsgraph can still be switched back on by the --enable-legacy-depsgraph option.

Internal definition of commonly used node functions, so that LLVM can optimize better.

This currently includes just a few 'value' nodes, but should be extended as much as feasible.
In particular many vector functions can be split component-wise.

Implemented common procedural texture patterns for LLVM.

Include all module functions in a single header for convenience.

Simple coordinate input node for texture nodes.

Handle all node type kinds appropriately.

The LLVM backend also supports PASS nodes, even though these are usually
removed from the node graph in a preprocessing step for clarity.

ARG nodes have their output values mapped in advance, so no extra code
needs to be generated for them.

Fix incorrect argument order for vector/color constructor functions.

Replaced mix of bool type flags for node types with a single enum for special kinds of nodes.

Implemented math functions for the LLVM backend.

Fix for missing notifier application on texture node trees.

The pynodes tree does not have the static NTREE_TEXTURE type set.

Fix node socket update callbacks exiting early because of missing output connection.

Outputs are currently identified in the nodes via the DO_OUTPUT flag. This is not
nicely accessible for pynodes and needs to be reimplemented in a proper way.
Until then this optimization for node recalculation should just be ignored for texnodes,
so nodes now have a callback for checking usage, and will always be considered used by default.

Remove redundant dependency declaration from pynodes, which creates a circular dependency.

Previously the "parameters" depsnode was the POST operation for node trees, but has now
been supplanted by the cache invalidation node. Making an explicit dependency on the component
thus creates a cycle.