Use one float-precision PI constant

- move PI_F into hl2h.h as constexpr 3.14159265f and remove the duplicated
  long-double-style literals from hl2h.cpp/esp.cpp
- extra digits are compile-time only; float operations cost the same

1 files changed, 5 insertions, 0 deletions

diff --git a/src/hl2h.h b/src/hl2h.h
index 37c849f..b86fe84 100644
--- a/src/hl2h.h
+++ b/src/hl2h.h
@@ -11,6 +11,11 @@
 #include <pthread.h>
 #include <unistd.h>
 
+// Shared float-precision constant. More digits than a float can hold are
+// rounded at compile time and have no runtime cost; a coarse value would only
+// hurt angular accuracy, never performance.
+constexpr float PI_F = 3.14159265f;
+
 // ---------------------------------------------------------------------------
 // logging
 // ---------------------------------------------------------------------------