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Use r128.h for high precision snapping

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This commit is contained in:
Aaron Franke
2025-08-12 04:02:26 -07:00
parent eee7ce635b
commit af8bdac5a9
2 changed files with 24 additions and 2 deletions
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25
scene/gui/range.cpp
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@@ -30,6 +30,28 @@
#include "range.h"
#include "thirdparty/misc/r128.h"
double Range::_snapped_r128(double p_value, double p_step) {
if (p_step != 0) {
// All these lines are the equivalent of: p_value = Math::floor(p_value / p_step + 0.5) * p_step;
// Convert to String to force rounding to a decimal value (not a binary one).
String step_str = String::num(p_step);
String value_str = String::num(p_value);
R128 step_r128;
R128 value_r128;
const R128 half_r128 = R128(0.5);
r128FromString(&step_r128, step_str.ascii().get_data(), nullptr);
r128FromString(&value_r128, value_str.ascii().get_data(), nullptr);
r128Div(&value_r128, &value_r128, &step_r128);
r128Add(&value_r128, &value_r128, &half_r128);
r128Floor(&value_r128, &value_r128);
r128Mul(&value_r128, &value_r128, &step_r128);
p_value = value_r128;
}
return p_value;
}
PackedStringArray Range::get_configuration_warnings() const {
PackedStringArray warnings = Control::get_configuration_warnings();
@@ -140,9 +162,8 @@ void Range::_set_value_no_signal(double p_val) {
double Range::_calc_value(double p_val, double p_step) const {
if (p_step > 0) {
// TODO: In the future, change `step` to a more suitable type for more robust precise calculations.
// Subtract min to support cases like min = 0.1, step = 0.2, snaps to 0.1, 0.3, 0.5, etc.
p_val = Math::snapped(p_val - shared->min, p_step) + shared->min;
p_val = _snapped_r128(p_val - shared->min, p_step) + shared->min;
}
if (_rounded_values) {

1
scene/gui/range.h
View File

@@ -62,6 +62,7 @@ class Range : public Control {
void _set_value_no_signal(double p_val);
protected:
static double _snapped_r128(double p_value, double p_step);
double _calc_value(double p_val, double p_step) const;
virtual void _value_changed(double p_value);
void _notify_shared_value_changed() { shared->emit_value_changed(); }