diff options
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/blenlib/CMakeLists.txt | |
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/blenlib/CMakeLists.txt')
-rw-r--r-- | source/blender/blenlib/CMakeLists.txt | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/source/blender/blenlib/CMakeLists.txt b/source/blender/blenlib/CMakeLists.txt index 9621a759f3c..9dd89834bbd 100644 --- a/source/blender/blenlib/CMakeLists.txt +++ b/source/blender/blenlib/CMakeLists.txt @@ -104,6 +104,7 @@ set(SRC intern/rct.c intern/scanfill.c intern/scanfill_utils.c + intern/simple_expr.c intern/smallhash.c intern/sort.c intern/sort_utils.c |