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Added some tests.

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This commit is contained in:
Acrimon 2019-09-24 11:36:35 +02:00
parent 7e768b84e4
commit 3db0b2946d
1 changed files with 19 additions and 3 deletions
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22
common/src/util/mod.rs
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@ -2,9 +2,10 @@ pub const GIT_HASH: &str = include_str!(concat!(env!("OUT_DIR"), "/githash"));
use vek::{Mat3, Rgb, Rgba, Vec3};
/// This is a fast approximation of powf. This should only be used when minor accuracy loss is acceptable.
#[inline(always)]
#[allow(unsafe_code)]
fn fast_powf(b: f32, e: f32) -> f32 {
fn approx_powf(b: f32, e: f32) -> f32 {
unsafe {
let b = b as f64;
let e = e as f64;
@ -19,6 +20,21 @@ fn fast_powf(b: f32, e: f32) -> f32 {
}
}
#[cfg(test)]
mod approx_powf_tests {
fn close_ei(a: f32, b: f32) -> bool {
(a - b < 1.0 && a - b > 0.0) || (b - a < 1.0 && b - a > 0.0)
}
#[test]
fn accuracy_1() {
let test_values: Vec<f32> = vec!(3.0, 2.5, 1.5, 2.2);
test_values.windows(2).for_each(|a| {
assert!(close_ei(a[0].powf(a[1]), super::approx_powf(a[0], a[1])));
});
}
}
#[inline(always)]
pub fn srgb_to_linear(col: Rgb<f32>) -> Rgb<f32> {
#[inline(always)]
@ -26,7 +42,7 @@ pub fn srgb_to_linear(col: Rgb<f32>) -> Rgb<f32> {
if x <= 0.04045 {
x / 12.92
} else {
fast_powf((x + 0.055) / 1.055, 2.4)
approx_powf((x + 0.055) / 1.055, 2.4)
}
}
col.map(to_linear)
@ -38,7 +54,7 @@ pub fn linear_to_srgb(col: Rgb<f32>) -> Rgb<f32> {
if x <= 0.0031308 {
x * 12.92
} else {
fast_powf(x, 1.0 / 2.4) * 1.055 - 0.055
approx_powf(x, 1.0 / 2.4) * 1.055 - 0.055
}
}
col.map(to_srgb)