From: Mikko Rasa <tdb@tdb.fi>
Date: Thu, 28 Nov 2013 12:51:23 +0000 (+0200)
Subject: Restore old samples value if create_targets fails
X-Git-Url: http://git.tdb.fi/?p=libs%2Fgl.git;a=commitdiff_plain;h=6cfe786e84d9d9474c7bd5a78d1b5c92e3868e4e

Restore old samples value if create_targets fails

An application could use try-catch to check if a certain level of
multisampling is available, and leaving samples to that value would
interfere with later operations.
---

diff --git a/source/pipeline.cpp b/source/pipeline.cpp
index 0df03ca7..d7e175de 100644
--- a/source/pipeline.cpp
+++ b/source/pipeline.cpp
@@ -49,8 +49,17 @@ void Pipeline::set_multisample(unsigned s)
 	if(s==samples)
 		return;
 
+	unsigned old_samples = samples;
 	samples = s;
-	create_targets(1);
+	try
+	{
+		create_targets(1);
+	}
+	catch(...)
+	{
+		samples = old_samples;
+		throw;
+	}
 }
 
 void Pipeline::set_camera(const Camera *c)