Enable Mapbox GL plugin on MinGW builds

Qt CI is using MinGW 5.3.0 that should do the job compiling Mapbox GL.

For now, only the ANGLE OpenGL backend is supported on Windows for this
plugin. I.e. you need to set QT_OPENGL=angle or Qt::AA_UseOpenGLES.

Task-number: QTBUG-60110
Change-Id: Iebd4d1569191f47a14b264c489b5d3fb23338d78
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Paolo Angelelli <paolo.angelelli@qt.io>

1 files changed, 10 insertions, 0 deletions

diff --git a/src/plugins/geoservices/mapboxgl/qgeoserviceproviderpluginmapboxgl.cpp b/src/plugins/geoservices/mapboxgl/qgeoserviceproviderpluginmapboxgl.cpp
index 30c01f8c..fb8dd19e 100644
--- a/src/plugins/geoservices/mapboxgl/qgeoserviceproviderpluginmapboxgl.cpp
+++ b/src/plugins/geoservices/mapboxgl/qgeoserviceproviderpluginmapboxgl.cpp
@@ -38,6 +38,7 @@
 #include "qgeoserviceproviderpluginmapboxgl.h"
 #include "qgeomappingmanagerenginemapboxgl.h"
 
+#include <QtGui/QOpenGLContext>
 
 QT_BEGIN_NAMESPACE
 
@@ -54,6 +55,15 @@ QGeoCodingManagerEngine *QGeoServiceProviderFactoryMapboxGL::createGeocodingMana
 QGeoMappingManagerEngine *QGeoServiceProviderFactoryMapboxGL::createMappingManagerEngine(
     const QVariantMap &parameters, QGeoServiceProvider::Error *error, QString *errorString) const
 {
+#ifdef Q_OS_WIN
+    if (QOpenGLContext::openGLModuleType() != QOpenGLContext::LibGLES) {
+        qWarning("The Mapbox GL plugin only supports OpenGL ES on Windows. \
+            Try setting the environment variable QT_OPENGL to 'angle'.");
+
+        return 0;
+    }
+#endif
+
     return new QGeoMappingManagerEngineMapboxGL(parameters, error, errorString);
 }