From 31c6d554458b27c88f432c2b9c37baacf5e4b454 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Samuel=20R=C3=B8dal?= <samuel.rodal@digia.com>
Date: Wed, 21 Nov 2012 14:32:30 +0100
Subject: [PATCH] Properly initialize glViewport() to appropriate value in
 QGLPixelBuffer.

Since we are using a hidden window in order to make the context current,
the viewport will end up with an arbitrary value. By setting it
explicitly we ensure compatibility with Qt 4.

Task-number: QTBUG-28115
Change-Id: I69fb5efda2b274b539c3d3b9fa842a2d32ad70b1
Reviewed-by: Sean Harmer <sean.harmer@kdab.com>
---
 src/opengl/qglpixelbuffer.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/opengl/qglpixelbuffer.cpp b/src/opengl/qglpixelbuffer.cpp
index 135f2edd01..d39ac3dea3 100644
--- a/src/opengl/qglpixelbuffer.cpp
+++ b/src/opengl/qglpixelbuffer.cpp
@@ -220,6 +220,7 @@ bool QGLPixelBuffer::makeCurrent()
             format.setSamples(d->req_format.samples());
         d->fbo = new QOpenGLFramebufferObject(d->req_size, format);
         d->fbo->bind();
+        glViewport(0, 0, d->req_size.width(), d->req_size.height());
     }
     return true;
 }