From 745efab6c4ac0886c03a0387f669226d078b5386 Mon Sep 17 00:00:00 2001
From: "Steinar H. Gunderson" <sgunderson@bigfoot.com>
Date: Sat, 19 Jan 2013 00:04:37 +0100
Subject: [PATCH] Force the LC_NUMERIC locale temporarily to C in finalize(),
 to avoid problems with locales messing with %f.

---
 effect_chain.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/effect_chain.cpp b/effect_chain.cpp
index 933553c..8767f7e 100644
--- a/effect_chain.cpp
+++ b/effect_chain.cpp
@@ -3,6 +3,7 @@
 #include <stdio.h>
 #include <math.h>
 #include <string.h>
+#include <locale.h>
 #include <assert.h>
 #include <GL/glew.h>
 
@@ -1307,6 +1308,10 @@ Node *EffectChain::find_output_node()
 
 void EffectChain::finalize()
 {
+	// Save the current locale, and set it to C, so that we can output decimal
+	// numbers with printf and be sure to get them in the format mandated by GLSL.
+	char *saved_locale = setlocale(LC_NUMERIC, "C");
+
 	// Output the graph as it is before we do any conversions on it.
 	output_dot("step0-start.dot");
 
@@ -1399,6 +1404,7 @@ void EffectChain::finalize()
 	assert(phases[0]->inputs.empty());
 	
 	finalized = true;
+	setlocale(LC_NUMERIC, saved_locale);
 }
 
 void EffectChain::render_to_fbo(GLuint dest_fbo, unsigned width, unsigned height)
-- 
2.39.2