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Added smoothstep built-in function

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(cherry picked from commit 514a3fb96a)
This commit is contained in:
Chaosus
2019-03-19 14:39:43 +03:00
committed by Hein-Pieter van Braam-Stewart
parent 340bf6e80c
commit 6ab01490f5
10 changed files with 91 additions and 1 deletions
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8
core/math/expression.cpp
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@@ -68,6 +68,7 @@ const char *Expression::func_name[Expression::FUNC_MAX] = {
"lerp",
"inverse_lerp",
"range_lerp",
"smoothstep",
"dectime",
"randomize",
"randi",
@@ -185,6 +186,7 @@ int Expression::get_func_argument_count(BuiltinFunc p_func) {
return 2;
case MATH_LERP:
case MATH_INVERSE_LERP:
case MATH_SMOOTHSTEP:
case MATH_DECTIME:
case MATH_WRAP:
case MATH_WRAPF:
@@ -392,6 +394,12 @@ void Expression::exec_func(BuiltinFunc p_func, const Variant **p_inputs, Variant
VALIDATE_ARG_NUM(4);
*r_return = Math::range_lerp((double)*p_inputs[0], (double)*p_inputs[1], (double)*p_inputs[2], (double)*p_inputs[3], (double)*p_inputs[4]);
} break;
case MATH_SMOOTHSTEP: {
VALIDATE_ARG_NUM(0);
VALIDATE_ARG_NUM(1);
VALIDATE_ARG_NUM(2);
*r_return = Math::smoothstep((double)*p_inputs[0], (double)*p_inputs[1], (double)*p_inputs[2]);
} break;
case MATH_DECTIME: {
VALIDATE_ARG_NUM(0);

1
core/math/expression.h
View File

@@ -66,6 +66,7 @@ public:
MATH_LERP,
MATH_INVERSE_LERP,
MATH_RANGE_LERP,
MATH_SMOOTHSTEP,
MATH_DECTIME,
MATH_RANDOMIZE,
MATH_RAND,

11
core/math/math_funcs.h
View File

@@ -208,6 +208,17 @@ public:
static _ALWAYS_INLINE_ double range_lerp(double p_value, double p_istart, double p_istop, double p_ostart, double p_ostop) { return Math::lerp(p_ostart, p_ostop, Math::inverse_lerp(p_istart, p_istop, p_value)); }
static _ALWAYS_INLINE_ float range_lerp(float p_value, float p_istart, float p_istop, float p_ostart, float p_ostop) { return Math::lerp(p_ostart, p_ostop, Math::inverse_lerp(p_istart, p_istop, p_value)); }
static _ALWAYS_INLINE_ double smoothstep(double p_from, double p_to, double p_weight) {
if (is_equal_approx(p_from, p_to)) return p_from;
double x = CLAMP((p_weight - p_from) / (p_to - p_from), 0.0, 1.0);
return x * x * (3.0 - 2.0 * x);
}
static _ALWAYS_INLINE_ float smoothstep(float p_from, float p_to, float p_weight) {
if (is_equal_approx(p_from, p_to)) return p_from;
float x = CLAMP((p_weight - p_from) / (p_to - p_from), 0.0f, 1.0f);
return x * x * (3.0f - 2.0f * x);
}
static _ALWAYS_INLINE_ double linear2db(double p_linear) { return Math::log(p_linear) * 8.6858896380650365530225783783321; }
static _ALWAYS_INLINE_ float linear2db(float p_linear) { return Math::log(p_linear) * 8.6858896380650365530225783783321; }