From 342b3c2b6048796d9e4ee9423c11dcdd57ead8c2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Vladim=C3=ADr=20Vondru=C5=A1?= <mosra@centrum.cz>
Date: Tue, 24 Nov 2015 16:07:55 +0100
Subject: [PATCH] Fix failing TransformFeedback GL test on Mesa.

---
 src/Magnum/Test/TransformFeedbackGLTest.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/Magnum/Test/TransformFeedbackGLTest.cpp b/src/Magnum/Test/TransformFeedbackGLTest.cpp
index b85df2485..9c41bdd04 100644
--- a/src/Magnum/Test/TransformFeedbackGLTest.cpp
+++ b/src/Magnum/Test/TransformFeedbackGLTest.cpp
@@ -434,6 +434,9 @@ void TransformFeedbackGLTest::interleaved() {
                 "void main() {\n"
                 "    output1 = inputData + vec2(1.0, -1.0);\n"
                 "    output2 = inputData.x - inputData.y + 5.0;\n"
+                /* Mesa drivers complain that vertex shader doesn't write to
+                   gl_Position otherwise */
+                "    gl_Position = vec4(1.0);\n"
                 "}\n").compile());
             attachShader(vert);
             bindAttributeLocation(Input::Location, "inputData");