HUD formatting ​

swofty/hud_format.hpp turns numbers into the text a HUD shows. It is pure: no game access, no allocation unless you ask for a std::string.

cpp
#include <swofty/hud_format.hpp>

namespace fmt = swofty::hud::format;

auto s = fmt::speed(83.333f);                     // {kph 300, mph 186}, rounded; reversing reads 0

char b[24];
fmt::gap(5199, b, sizeof b);                      // "+5.1"      tenths cut, as a timing screen does
fmt::gap(5199, b, sizeof b, fmt::GapStyle::round_tenths);   // "+5.2"
fmt::gap(65333, b, sizeof b);                     // "+1:05.3"
fmt::gap(65333, b, sizeof b, fmt::GapStyle::thousandths);   // "+1:05.333"
fmt::lapped(3, b, sizeof b);                      // "+3 LAPS"   ("+1 LAP" for one, empty for none)
fmt::lap_time(106123, b, sizeof b);               // "1:46.123"
fmt::sector_time(28412, b, sizeof b);             // "28.412"

fmt::session_label(6);                            // "Q2"   (1..4 P, 5..9 Q, 10..14 SQ, 15..17 R, 18 TT)
fmt::is_race(15);                                 // true
fmt::fit("Pérez", 2);                             // "P": never cuts a UTF-8 character

char code[4];
fmt::driver_code("", "Max Verstappen", code);     // "VER": the game's code when given, else the family name
  • Header: swofty/hud_format.hpp, namespace swofty::hud::format. Functions that fill a buffer return the length written (snprintf semantics, the capacity includes the NUL).
  • Gap and lap time styles are Project Halo's timing tower text.

Parts of this header are the generic pieces of Project Halo's HUD code, ported with permission. Uses work from Project Halo by nyannoying, https://github.com/nyannoying1337/f1-25-project-halo.

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