Alexander Gavrilov
fc1f5bded4
The dependency graph has to know whether a driver must be re-evaluated
every frame due to a dependency on the current frame number. For python
drivers it was using a heuristic based on searching for certain sub-
strings in the expression, notably including '('.
When the expression is actually evaluated using Python, this can't be
easily improved; however if the Simple Expression evaluator is used,
this check can be done precisely by accessing the parsed data.
Differential Revision: https://developer.blender.org/D6624
62 lines
2.2 KiB
C++
62 lines
2.2 KiB
C++
/*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* The Original Code is Copyright (C) 2018 Blender Foundation, Alexander Gavrilov
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* All rights reserved.
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*/
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#ifndef __BLI_EXPR_PYLIKE_EVAL_H__
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#define __BLI_EXPR_PYLIKE_EVAL_H__
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/** \file
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* \ingroup bli
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*/
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#ifdef __cplusplus
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extern "C" {
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#endif
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/** Opaque structure containing pre-parsed data for evaluation. */
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typedef struct ExprPyLike_Parsed ExprPyLike_Parsed;
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/** Expression evaluation return code. */
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typedef enum eExprPyLike_EvalStatus {
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EXPR_PYLIKE_SUCCESS = 0,
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/* Computation errors; result is still set, but may be NaN */
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EXPR_PYLIKE_DIV_BY_ZERO,
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EXPR_PYLIKE_MATH_ERROR,
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/* Expression dependent errors or bugs; result is 0 */
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EXPR_PYLIKE_INVALID,
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EXPR_PYLIKE_FATAL_ERROR,
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} eExprPyLike_EvalStatus;
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void BLI_expr_pylike_free(struct ExprPyLike_Parsed *expr);
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bool BLI_expr_pylike_is_valid(struct ExprPyLike_Parsed *expr);
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bool BLI_expr_pylike_is_constant(struct ExprPyLike_Parsed *expr);
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bool BLI_expr_pylike_is_using_param(struct ExprPyLike_Parsed *expr, int index);
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ExprPyLike_Parsed *BLI_expr_pylike_parse(const char *expression,
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const char **param_names,
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int param_names_len);
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eExprPyLike_EvalStatus BLI_expr_pylike_eval(struct ExprPyLike_Parsed *expr,
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const double *param_values,
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int param_values_len,
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double *r_result);
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#ifdef __cplusplus
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}
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#endif
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#endif /* __BLI_EXPR_PYLIKE_EVAL_H__ */
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