From 7f905cd9dc8dee8467a571f894f93da2bbefd924 Mon Sep 17 00:00:00 2001
From: Adubbz <Adubbz@users.noreply.github.com>
Date: Sun, 25 Feb 2018 12:43:19 +1100
Subject: [PATCH] Cleanup some math stuff

---
 Makefile.nx   | 2 +-
 common/math.c | 7 +------
 common/menu.c | 5 ++---
 3 files changed, 4 insertions(+), 10 deletions(-)

diff --git a/Makefile.nx b/Makefile.nx
index c765b15..933e98b 100644
--- a/Makefile.nx
+++ b/Makefile.nx
@@ -52,7 +52,7 @@ CXXFLAGS	:= $(CFLAGS) -fno-rtti -fno-exceptions -std=gnu++11
 ASFLAGS	:=	-g $(ARCH)
 LDFLAGS	=	-specs=$(DEVKITPRO)/libnx/switch.specs -g $(ARCH) -Wl,-Map,$(notdir $*.map)
 
-LIBS	:= -lnx
+LIBS	:= -lnx -lm
 
 #---------------------------------------------------------------------------------
 # list of directories containing libraries, this must be the top level containing
diff --git a/common/math.c b/common/math.c
index 23b86dc..67799b3 100644
--- a/common/math.c
+++ b/common/math.c
@@ -5,12 +5,7 @@ float approxSin(float x) {
     float ret;
 
     // always wrap input angle to -PI..PI
-    while (x<-3.14159265 || x>3.14159265) {
-        if (x<-3.14159265)
-            x += 6.28318531;
-        else if (x >3.14159265)
-            x -= 6.28318531;
-    }
+    x = fmod(x, M_PI*2.0)-M_PI;
 
     // compute sine
     if (x<0)
diff --git a/common/menu.c b/common/menu.c
index 704b75d..2accac3 100644
--- a/common/menu.c
+++ b/common/menu.c
@@ -68,12 +68,11 @@ static void drawEntry(menuEntry_s* me, int off_x, int is_active) {
     int shadow_inset;
     color_t shadow_color;
     uint8_t shadow_alpha_base = 80;
-    float highlight_multiplier, highlight_mod;
+    float highlight_multiplier;
     int shadow_size = 4;
 
     if (is_active) {
-        highlight_mod = timer - 1.0 * (int)(timer / 1.0);
-        highlight_multiplier = fmax(0.0, fabs(highlight_mod - 0.5) / 0.5);
+        highlight_multiplier = fmax(0.0, fabs(fmod(timer, 1.0) - 0.5) / 0.5);
         border_color = MakeColor(themeCurrent.highlightColor.r + (255 - themeCurrent.highlightColor.r) * highlight_multiplier, themeCurrent.highlightColor.g + (255 - themeCurrent.highlightColor.g) * highlight_multiplier, themeCurrent.highlightColor.b + (255 - themeCurrent.highlightColor.b) * highlight_multiplier, 255);
         border_start_x = start_x-5;
         border_end_x = end_x+5;