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RoundScalar() use a lookup table to avoid calling powf(10.0f, x);

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ocornut 2015-08-05 16:17:11 -06:00
parent f0f2afa87d
commit cc8ff4c8d1
1 changed files with 2 additions and 2 deletions
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imgui.cpp
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@ -5990,10 +5990,10 @@ static inline int ParseFormatPrecision(const char* fmt, int default_precision)
static inline float RoundScalar(float value, int decimal_precision) static inline float RoundScalar(float value, int decimal_precision)
{ {
// Round past decimal precision // Round past decimal precision
// 0: 1, 1: 0.1, 2: 0.01, etc.
// So when our value is 1.99999 with a precision of 0.001 we'll end up rounding to 2.0 // So when our value is 1.99999 with a precision of 0.001 we'll end up rounding to 2.0
// FIXME: Investigate better rounding methods // FIXME: Investigate better rounding methods
float min_step = 1.0f / powf(10.0f, (float)decimal_precision); static const float min_steps[10] = { 1.0f, 0.1f, 0.01f, 0.001f, 0.0001f, 0.00001f, 0.000001f, 0.0000001f, 0.00000001f, 0.000000001f };
float min_step = (decimal_precision >= 0 && decimal_precision < 10) ? min_steps[decimal_precision] : (1.0f / powf(10.0f, (float)decimal_precision));
bool negative = value < 0.0f; bool negative = value < 0.0f;
value = fabsf(value); value = fabsf(value);
float remainder = fmodf(value, min_step); float remainder = fmodf(value, min_step);