Blender Git Commits

Added "show_brush" option for hair edit settings, expected by common paint UI.

This setting has no effect yet for hair editing, but the UI script expects it.

Merge branch 'master' into object_nodes

Merge branch 'master' into strand_nodes

Merge branch 'master' into strand_editmode

Merge branch 'object_nodes' into strand_nodes

Added a number of addition matrix manipulation nodes.

Removed the "effects" settings for statically defined fiber displacement effects.

These things will now be possible using nodes.

Fix shader updating, needs a tag reset after invalidating the shader.

Fix debug geometry shader for strands.

This geometry shader must be used regardless of the "use geometry shader" setting
for the primary shader.

Fallback displacement function for the strands shader if no nodetree is available.

Depsgraph integration for hair strand nodes (horrible).

The depsgraph now invalidates the strand shader when the nodes are changed.
As mentioned in the previous commit, this happens through an operation in
the object GEOMETRY component for each strand modifier. This is messy, only
useful until we have truly granular modifier integration in the depsgraph.

Invalidating the shader is currently done just by setting a flag. The actual
freeing and subsequent lazy-rebuild of the shader is done in the drawing
thread, because during the threaded depsgraph update we don't have a valid
OpenGL context. This needs to be sorted out for future viewport recode.

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

This reverts commit ca85cb436db7dc9ff5e8df3172987b09f5a071c4.

Reverting the commit will break depsgraph updates for regular bvm functions again, but is necessary
for making shader updates working. The problem here is that the update operations for _dependent_
data (bvm functions, shaders, etc.) should not actually be part of the node tree, but of the
respective dependent data components! So the previous method of invalidating shaders as part
of the node tree operations is incorrect and the operation should be moved to some other place.
Perhaps we need a dedicated depsnode for the bvm function cache, since there is no single "owner"
of these functions that could take care of invalidation in the depsgraph.

Implementation of basic math functions for GLSL code generation from nodes.

Each node gets expanded to two function calls for autodiff.

The value is calculated without any derivative inputs (this is not a differential equation).
The derivatives in both variables also depend on the partial derivatives of the inputs.

Incorporate the generated GLSL code for hair displacement into the strands vertex shader.

Emit function calls for each node.

Base functions are yet to be defined.

Support dual values for autodiff'ing in GLSL codegen right from the start.

Note that for the hair displacement function we would only be interested
in a single derivative (the tangent). For now we just use the existing
2-variable duals, later on this can be generalized to avoid unnecessary
and confusing code emission.

First steps for the GLSL code generator and hair displacement nodes.

Node API for generating hair deformation GLSL code.

This is just a stub atm. The BVM system will use nodes to generate
a GLSL function, which can then be inserted into and compiled with
a framework shader. The deformation function itself is just a simple
expression (with autodiff for tangents), so it doesn't need to know
about the topology of index buffers and the like.

Smarter handling of debug_mode enum in the debugging utility script.