Add workaround for GL on Android emulator

On the Android Emulator, the shaders will be compiled by a desktop
GL driver, since the GL driver in the emulator is just a thin
wrapper. The GL driver does not necessarily support the precision
qualifiers, which can cause applications to break. We detect this
at runtime in the platform plugin and set a workaround flag to

Task-number: QTBUG-32557
Change-Id: Ied00cfe8e804d1f7862697dd379a14f3bed3d980
Reviewed-by: Gunnar Sletta <gunnar.sletta@digia.com>

2 files changed, 16 insertions, 0 deletions

diff --git a/src/plugins/platforms/android/src/opengl/qandroidopenglcontext.cpp b/src/plugins/platforms/android/src/opengl/qandroidopenglcontext.cpp
index 4d741807d0..9d6d4003f7 100644
--- a/src/plugins/platforms/android/src/opengl/qandroidopenglcontext.cpp
+++ b/src/plugins/platforms/android/src/opengl/qandroidopenglcontext.cpp
@@ -46,6 +46,8 @@
 #include <QtCore/qdebug.h>
 #include <qpa/qwindowsysteminterface.h>
 
+#include <QtGui/private/qopenglcontext_p.h>
+
 QT_BEGIN_NAMESPACE
 
 QAndroidOpenGLContext::QAndroidOpenGLContext(const QAndroidPlatformIntegration *integration,
@@ -75,4 +77,17 @@ void QAndroidOpenGLContext::swapBuffers(QPlatformSurface *surface)
     }
 }
 
+bool QAndroidOpenGLContext::makeCurrent(QPlatformSurface *surface)
+{
+    bool ret = QEglFSContext::makeCurrent(surface);
+
+    const char *rendererString = reinterpret_cast<const char *>(glGetString(GL_RENDERER));
+    if (rendererString != 0 && qstrncmp(rendererString, "Android Emulator", 16) == 0) {
+        QOpenGLContextPrivate *ctx_d = QOpenGLContextPrivate::get(context());
+        ctx_d->workaround_missingPrecisionQualifiers = true;
+    }
+
+    return ret;
+}
+
 QT_END_NAMESPACE
diff --git a/src/plugins/platforms/android/src/opengl/qandroidopenglcontext.h b/src/plugins/platforms/android/src/opengl/qandroidopenglcontext.h
index c4c5a430ad..c419ae8392 100644
--- a/src/plugins/platforms/android/src/opengl/qandroidopenglcontext.h
+++ b/src/plugins/platforms/android/src/opengl/qandroidopenglcontext.h
@@ -58,6 +58,7 @@ public:
                           EGLenum eglApi = EGL_OPENGL_ES_API);
 
     void swapBuffers(QPlatformSurface *surface);
+    bool makeCurrent(QPlatformSurface *surface);
 
 private:
     const QAndroidPlatformIntegration *m_platformIntegration;