From d2113dc9f5aaf465f4c5135743ca0dee320be4e8 Mon Sep 17 00:00:00 2001
From: Camilla Berglund <elmindreda@elmindreda.org>
Date: Mon, 27 Jul 2015 16:04:21 +0200
Subject: [PATCH] Remove ad-hoc M_PIs and enable VC++ macro

Fixes #564.
---
 examples/boing.c     | 10 +++++-----
 examples/gears.c     |  8 ++++----
 examples/particles.c | 10 +++++-----
 examples/splitview.c |  9 +++++----
 examples/wave.c      |  9 +++++----
 tests/cursor.c       |  5 +++++
 6 files changed, 29 insertions(+), 22 deletions(-)

diff --git a/examples/boing.c b/examples/boing.c
index ec313596..0dd7b577 100644
--- a/examples/boing.c
+++ b/examples/boing.c
@@ -27,6 +27,11 @@
  * a hidden computer or VCR.
  *****************************************************************************/
 
+#if defined(_MSC_VER)
+ // Make MS math.h define M_PI
+ #define _USE_MATH_DEFINES
+#endif
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <math.h>
@@ -102,11 +107,6 @@ double  dt;
  #define RAND_MAX 4095
 #endif
 
-/* PI */
-#ifndef M_PI
- #define M_PI 3.1415926535897932384626433832795
-#endif
-
 
 /*****************************************************************************
  * Truncate a degree.
diff --git a/examples/gears.c b/examples/gears.c
index 2d445964..55d2f672 100644
--- a/examples/gears.c
+++ b/examples/gears.c
@@ -21,6 +21,10 @@
  *   - Enabled vsync
  */
 
+#if defined(_MSC_VER)
+ // Make MS math.h define M_PI
+ #define _USE_MATH_DEFINES
+#endif
 
 #include <math.h>
 #include <stdlib.h>
@@ -28,10 +32,6 @@
 #include <string.h>
 #include <GLFW/glfw3.h>
 
-#ifndef M_PI
-#define M_PI 3.141592654
-#endif
-
 /* If non-zero, the program exits after that many seconds
  */
 static int autoexit = 0;
diff --git a/examples/particles.c b/examples/particles.c
index 64f2e831..175468d0 100644
--- a/examples/particles.c
+++ b/examples/particles.c
@@ -24,6 +24,11 @@
 //
 //========================================================================
 
+#if defined(_MSC_VER)
+ // Make MS math.h define M_PI
+ #define _USE_MATH_DEFINES
+#endif
+
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
@@ -43,11 +48,6 @@
 #define GL_SEPARATE_SPECULAR_COLOR_EXT    0x81FA
 #endif // GL_EXT_separate_specular_color
 
-// Some <math.h>'s do not define M_PI
-#ifndef M_PI
-#define M_PI 3.141592654
-#endif
-
 
 //========================================================================
 // Type definitions
diff --git a/examples/splitview.c b/examples/splitview.c
index 6c911969..9e25a742 100644
--- a/examples/splitview.c
+++ b/examples/splitview.c
@@ -14,14 +14,15 @@
 #define GLFW_INCLUDE_GLEXT
 #include <GLFW/glfw3.h>
 
+#if defined(_MSC_VER)
+ // Make MS math.h define M_PI
+ #define _USE_MATH_DEFINES
+#endif
+
 #include <math.h>
 #include <stdio.h>
 #include <stdlib.h>
 
-#ifndef M_PI
-#define M_PI 3.14159265358979323846
-#endif
-
 
 //========================================================================
 // Global variables
diff --git a/examples/wave.c b/examples/wave.c
index bafe4652..3c6038f9 100644
--- a/examples/wave.c
+++ b/examples/wave.c
@@ -8,6 +8,11 @@
  * 2010-10-24: Formatting and cleanup - Camilla Berglund
  *****************************************************************************/
 
+#if defined(_MSC_VER)
+ // Make MS math.h define M_PI
+ #define _USE_MATH_DEFINES
+#endif
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <math.h>
@@ -15,10 +20,6 @@
 #define GLFW_INCLUDE_GLU
 #include <GLFW/glfw3.h>
 
-#ifndef M_PI
- #define M_PI 3.1415926535897932384626433832795
-#endif
-
 // Maximum delta T to allow for differential calculations
 #define MAX_DELTA_T 0.01
 
diff --git a/tests/cursor.c b/tests/cursor.c
index 6f165213..7a932501 100644
--- a/tests/cursor.c
+++ b/tests/cursor.c
@@ -32,6 +32,11 @@
 
 #include <GLFW/glfw3.h>
 
+#if defined(_MSC_VER)
+ // Make MS math.h define M_PI
+ #define _USE_MATH_DEFINES
+#endif
+
 #include <math.h>
 #include <stdio.h>
 #include <stdlib.h>