File 0001-Add-missing-guard-required-for-GLES-to-disable-stere.patch of Package vtk

From a9c31af9e6edd45ae01fb2712ad7a3c0d3e3cc37 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Stefan=20Br=C3=BCns?= <stefan.bruens@rwth-aachen.de>
Date: Sat, 4 Jul 2020 21:04:52 +0200
Subject: [PATCH] Add missing guard required for GLES to disable stereo
 rendering

fmt.stereo() will evaluate to false for GLES, guard the whole block
so GL_BACK_* is not used.
Qt already includes the OpenGL/GLES headers, so GL_ES_VERSION_2_0 will
be defined for Qt GLES builds.
---
 GUISupport/Qt/QVTKOpenGLWindow.cxx | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/GUISupport/Qt/QVTKOpenGLWindow.cxx b/GUISupport/Qt/QVTKOpenGLWindow.cxx
index 335feb581c..b692b5490a 100644
--- a/GUISupport/Qt/QVTKOpenGLWindow.cxx
+++ b/GUISupport/Qt/QVTKOpenGLWindow.cxx
@@ -231,6 +231,7 @@ void QVTKOpenGLWindow::paintGL()
 
     const QSize deviceSize = this->size() * this->devicePixelRatioF();
     const auto fmt = this->context()->format();
+#ifndef GL_ES_VERSION_2_0
     if (fmt.stereo() && this->RenderWindow->GetStereoRender() &&
       this->RenderWindow->GetStereoType() == VTK_STEREO_CRYSTAL_EYES)
     {
@@ -240,6 +241,7 @@ void QVTKOpenGLWindow::paintGL()
         this->defaultFramebufferObject(), GL_BACK_RIGHT, QRect(QPoint(0, 0), deviceSize));
     }
     else
+#endif
     {
       this->RenderWindowAdapter->blit(
         this->defaultFramebufferObject(), GL_BACK, QRect(QPoint(0, 0), deviceSize));
-- 
2.27.0