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[Core] Approximate equality

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Aaron Franke 2019-04-25 13:19:14 -04:00
parent cce2e4b07c
commit b2e1c9c276
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6 changed files with 34 additions and 26 deletions
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19
core/math/math_funcs.h
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@ -272,13 +272,20 @@ public:
return diff < epsilon;
}
static _ALWAYS_INLINE_ bool is_equal_approx(real_t a, real_t b, real_t epsilon = CMP_EPSILON) {
// TODO: Comparing floats for approximate-equality is non-trivial.
// Using epsilon should cover the typical cases in Godot (where a == b is used to compare two reals), such as matrix and vector comparison operators.
// A proper implementation in terms of ULPs should eventually replace the contents of this function.
// See https://randomascii.wordpress.com/2012/02/25/comparing-floating-point-numbers-2012-edition/ for details.
static _ALWAYS_INLINE_ bool is_equal_approx(real_t a, real_t b) {
real_t tolerance = CMP_EPSILON * abs(a);
if (tolerance < CMP_EPSILON) {
tolerance = CMP_EPSILON;
}
return abs(a - b) < tolerance;
}
return abs(a - b) < epsilon;
static _ALWAYS_INLINE_ bool is_equal_approx(real_t a, real_t b, real_t tolerance) {
return abs(a - b) < tolerance;
}
static _ALWAYS_INLINE_ bool is_zero_approx(real_t s) {
return abs(s) < CMP_EPSILON;
}
static _ALWAYS_INLINE_ float absf(float g) {