maths/fast: add minimal explanation of estrin function

2021-05-12 15:29:12 +10:00 · 2021-05-12 15:29:12 +10:00 · 41f444a943
commit 41f444a943
parent 15ee2f5f58
1 changed files with 2 additions and 0 deletions
--- a/maths/fast.hpp
+++ b/maths/fast.hpp
@ -12,6 +12,8 @@
 #include "../debug/assert.hpp"

 namespace cruft::maths::fast {
+    // computes: a + t * b + t^2 * c + t^3 * d, but hopefully a little more
+    // efficiently than typing out the above directly.
    constexpr float
    estrin (float t, float a, float b, float c, float d)
    {