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| author | Alexander Gavrilov <angavrilov@gmail.com> | 2018-09-15 15:32:40 +0300 |
|---|---|---|
| committer | Alexander Gavrilov <angavrilov@gmail.com> | 2018-09-18 13:25:28 +0300 |
| commit | bf2a54b0584c1e568af7ecf67ae2a623bc5263fe (patch) | |
| tree | f123a9ca55d475dd676351d635bf944a31a27200 /source/blender/blenloader | |
| parent | 34ee9ab97c0cf629987f8f3f72b529ca7e73e027 (diff) | |
Support evaluating simple driver expressions without Python interpreter.
Recently @sergey found that hard-coding evaluation of certain very
common driver expressions without calling the Python interpreter
produces a 30-40% performance improvement. Since hard-coding is
obviously not suitable for production, I implemented a proper
parser and interpreter for simple arithmetic expressions in C.
The evaluator supports +, -, *, /, (), ==, !=, <, <=, >, >=,
and, or, not, ternary if; driver variables, frame, pi, True, False,
and a subset of standard math functions that seem most useful.
Booleans are represented as numbers, since within the supported
operation set it seems to be impossible to distinguish True/False
from 1.0/0.0. Boolean operations properly implement lazy evaluation
with jumps, and comparisons support chaining like 'a < b < c...'.
Expressions are parsed into a very simple stack machine program
that can then be safely evaluated in multiple threads.
Reviewers: sergey, campbellbarton
Differential Revision: https://developer.blender.org/D3698
Diffstat (limited to 'source/blender/blenloader')
| -rw-r--r-- | source/blender/blenloader/intern/readfile.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/source/blender/blenloader/intern/readfile.c b/source/blender/blenloader/intern/readfile.c index b774bb8d1f6..db6dacd2064 100644 --- a/source/blender/blenloader/intern/readfile.c +++ b/source/blender/blenloader/intern/readfile.c @@ -2675,6 +2675,7 @@ static void direct_link_fcurves(FileData *fd, ListBase *list) /* compiled expression data will need to be regenerated (old pointer may still be set here) */ driver->expr_comp = NULL; + driver->expr_simple = NULL; /* give the driver a fresh chance - the operating environment may be different now * (addons, etc. may be different) so the driver namespace may be sane now [#32155] |