From c1282964c5d834f8872ed6042a928a741802efae Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Vladim=C3=ADr=20Vondru=C5=A1?= <mosra@centrum.cz>
Date: Fri, 3 Jan 2014 00:11:55 +0100
Subject: [PATCH] Verify that version retrieval went right.

Sometimes the context is created improperly and all gl* functions are
causing errors. Added check for that case.
---
 src/Context.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/Context.cpp b/src/Context.cpp
index 7c7d31929..33d8c87b1 100644
--- a/src/Context.cpp
+++ b/src/Context.cpp
@@ -295,6 +295,9 @@ Context::Context() {
     #endif
     _version = static_cast<Version>(_majorVersion*100+_minorVersion*10);
 
+    CORRADE_ASSERT(Renderer::error() == Renderer::Error::NoError,
+        "Context: cannot retrieve OpenGL version", );
+
     #ifndef MAGNUM_TARGET_GLES
     CORRADE_ASSERT(isVersionSupported(Version::GL210), "Context: unsupported OpenGL version" << Int(_version), );
     #elif defined(MAGNUM_TARGET_GLES2)