From 879c789a0828ef86ebb1bd5c608420d3cdf89253 Mon Sep 17 00:00:00 2001
From: bjorn <tie.372@gmail.com>
Date: Thu, 20 Jun 2019 21:43:40 -0700
Subject: [PATCH] Polyfill M_PI;

It technically isn't part of C, which is causing problems on some systems.
---
 src/api/l_graphics.c               | 4 ++--
 src/core/util.h                    | 4 ++++
 src/modules/graphics/graphics.c    | 1 +
 src/modules/headset/desktop.c      | 1 +
 src/modules/math/randomGenerator.c | 2 +-
 5 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/src/api/l_graphics.c b/src/api/l_graphics.c
index a346c785..b501fcca 100644
--- a/src/api/l_graphics.c
+++ b/src/api/l_graphics.c
@@ -865,8 +865,8 @@ static int l_lovrGraphicsArc(lua_State* L) {
   float transform[16];
   index = luax_readmat4(L, index, transform, 1);
   float r1 = luax_optfloat(L, index++, 0.f);
-  float r2 = luax_optfloat(L, index++, 2.f * M_PI);
-  int segments = luaL_optinteger(L, index, 64) * (MIN(fabsf(r2 - r1), 2 * M_PI) / (2 * M_PI));
+  float r2 = luax_optfloat(L, index++, 2.f * (float) M_PI);
+  int segments = luaL_optinteger(L, index, 64) * (MIN(fabsf(r2 - r1), 2.f * (float) M_PI) / (2.f * (float) M_PI));
   lovrGraphicsArc(style, mode, material, transform, r1, r2, segments);
   return 0;
 }
diff --git a/src/core/util.h b/src/core/util.h
index 39d8c481..28c7b406 100644
--- a/src/core/util.h
+++ b/src/core/util.h
@@ -23,6 +23,10 @@
 #define LOVR_INLINE inline
 #endif
 
+#ifndef M_PI
+#define M_PI 3.14159265358979
+#endif
+
 #define MAX(a, b) (a > b ? a : b)
 #define MIN(a, b) (a < b ? a : b)
 #define CLAMP(x, min, max) MAX(min, MIN(max, x))
diff --git a/src/modules/graphics/graphics.c b/src/modules/graphics/graphics.c
index 4aeb5ef8..1fabbdcb 100644
--- a/src/modules/graphics/graphics.c
+++ b/src/modules/graphics/graphics.c
@@ -9,6 +9,7 @@
 #include "math/math.h"
 #include "core/maf.h"
 #include "core/ref.h"
+#include "core/util.h"
 #include <stdlib.h>
 #include <string.h>
 #include <math.h>
diff --git a/src/modules/headset/desktop.c b/src/modules/headset/desktop.c
index d5ce3e49..4044d4df 100644
--- a/src/modules/headset/desktop.c
+++ b/src/modules/headset/desktop.c
@@ -1,6 +1,7 @@
 #include "headset/headset.h"
 #include "graphics/graphics.h"
 #include "core/maf.h"
+#include "core/util.h"
 #include "platform.h"
 #include <math.h>
 #include <stdint.h>
diff --git a/src/modules/math/randomGenerator.c b/src/modules/math/randomGenerator.c
index 554b34ca..301a4b08 100644
--- a/src/modules/math/randomGenerator.c
+++ b/src/modules/math/randomGenerator.c
@@ -83,7 +83,7 @@ double lovrRandomGeneratorRandomNormal(RandomGenerator* generator) {
   double a = lovrRandomGeneratorRandom(generator);
   double b = lovrRandomGeneratorRandom(generator);
   double r = sqrt(-2. * log(1. - a));
-  double phi = 2 * M_PI * (1. - b);
+  double phi = 2. * M_PI * (1. - b);
   generator->lastRandomNormal = r * cos(phi);
   return r * sin(phi);
 }