From 31fe70019d96c79131c6047aeb08ce137aaa0208 Mon Sep 17 00:00:00 2001
From: Nathan Letwory <nathan@letworyinteractive.com>
Date: Wed, 26 May 2010 23:03:25 +0000
Subject: [PATCH] Add floating-point exception handler trap for Windows (MSVC).
 Now you can set breakpoint on fpe_handler on Windows too when debugging
 floating-point funkyness.

---
 source/creator/creator.c | 19 +++++++++++--------
 1 file changed, 11 insertions(+), 8 deletions(-)

diff --git a/source/creator/creator.c b/source/creator/creator.c
index 429646fe5b6..2d1125e75ce 100644
--- a/source/creator/creator.c
+++ b/source/creator/creator.c
@@ -142,8 +142,8 @@ char blender_path[FILE_MAXDIR+FILE_MAXFILE] = BLENDERPATH;
 /* Initialise callbacks for the modules that need them */
 static void setCallbacks(void); 
 
-/* on linux set breakpoints here when running in debug mode, useful to catch floating point errors */
-#if defined(__sgi) || defined(__linux__) || OSX_SSE_FPE
+/* set breakpoints here when running in debug mode, useful to catch floating point errors */
+#if defined(__sgi) || defined(__linux__) || defined(_WIN32) || OSX_SSE_FPE
 static void fpe_handler(int sig)
 {
 	// printf("SIGFPE trapped\n");
@@ -362,21 +362,24 @@ static int debug_mode(int argc, char **argv, void *data)
 
 static int set_fpe(int argc, char **argv, void *data)
 {
-#if defined(__sgi) || defined(__linux__) || OSX_SSE_FPE
+#if defined(__sgi) || defined(__linux__) || defined(_WIN32) || OSX_SSE_FPE
 	/* zealous but makes float issues a heck of a lot easier to find!
 	 * set breakpoints on fpe_handler */
 	signal(SIGFPE, fpe_handler);
 
-#if defined(__linux__) && defined(__GNUC__)
+# if defined(__linux__) && defined(__GNUC__)
 	feenableexcept(FE_DIVBYZERO | FE_INVALID | FE_OVERFLOW );
-#else
-#if OSX_SSE_FPE
+# endif	/* defined(__linux__) && defined(__GNUC__) */
+# if OSX_SSE_FPE
 	/* OSX uses SSE for floating point by default, so here 
 	 * use SSE instructions to throw floating point exceptions */
 	_MM_SET_EXCEPTION_MASK(_MM_MASK_MASK &~
 						   (_MM_MASK_OVERFLOW|_MM_MASK_INVALID|_MM_MASK_DIV_ZERO));
-#endif	/* OSX_SSE_FPE */
-#endif	/* defined(__linux__) && defined(__GNUC__) */
+# endif	/* OSX_SSE_FPE */
+# if defined(_WIN32) && defined(_MSC_VER)
+	_controlfp_s(NULL, 0, _MCW_EM); /* enables all fp exceptions */
+	_controlfp_s(NULL, _EM_DENORMAL | _EM_UNDERFLOW | _EM_INEXACT, _MCW_EM); /* hide the ones we don't care about */
+# endif /* _WIN32 && _MSC_VER */
 #endif
 
 	return 0;