advanced translate

1 files changed, 23 insertions, 0 deletions

diff --git a/evc/src/format/ser.rs b/evc/src/format/ser.rs
index 731a7a3..817cafe 100644
--- a/evc/src/format/ser.rs
+++ b/evc/src/format/ser.rs
@@ -246,6 +246,29 @@ impl Ser for Small<Vec2<isize>> {
     }
 }
 
+pub fn map_scalar8(v: i8) -> f32 {
+    match v {
+        0 => 0.0,
+        x if x > 0 => 2f32.powf((x as f32).abs() / 2.0 - 2.0),
+        x => -2f32.powf((-x as f32).abs() / 2.0 - 2.0),
+    }
+}
+// const SCALAR8: [f32; 256] = gen_scalar8_lookup();
+// const fn gen_scalar8_lookup() -> [f32; 256] {
+//     let mut a = [0.0; 256];
+//     let mut i = 0usize;
+//     while i < 256 {
+//         a[i as usize] = if i == 0 {
+//             0.0
+//         } else {
+//             let x = i as i8 as f32;
+//             x.signum() * 2f32.powf(x.abs() / 2.0 - 2.0)
+//         };
+//         i += 1;
+//     }
+//     a
+// }
+
 #[cfg(test)]
 mod test {
     use super::{Ser, Sink};