From ef4245572c832bd727d0965fcfbaa6b267d1e704 Mon Sep 17 00:00:00 2001
From: Matt <m.moninger.h@gmail.com>
Date: Sun, 22 Dec 2019 23:15:44 +0100
Subject: [PATCH] Use integer math for guest initial happiness calculation

---
 src/openrct2/world/Park.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/openrct2/world/Park.cpp b/src/openrct2/world/Park.cpp
index 855171e30a..42e22b7c92 100644
--- a/src/openrct2/world/Park.cpp
+++ b/src/openrct2/world/Park.cpp
@@ -657,7 +657,10 @@ uint8_t Park::CalculateGuestInitialHappiness(uint8_t percentage)
     // This sequence can be defined as PI*(9+n)/2 (the value is floored)
     for (uint8_t n = 1; n < 55; n++)
     {
-        if ((3.14159 * (9 + n)) / 2 >= percentage)
+        // Avoid floating point math by rescaling PI up.
+        constexpr int32_t SCALE = 100000;
+        constexpr int32_t PI_SCALED = 314159; // PI * SCALE;
+        if (((PI_SCALED * (9 + n)) / SCALE) / 2 >= percentage)
         {
             return (9 + n) * 4;
         }