Implement public utility function for AA setup

qDefaultSurfaceFormat() can be used to set up antialiasing for QML
apps in just two lines:

...
viewer.setFormat(QtDataVisualization::qDefaultSurfaceFormat());

Task-number: QTRD-2734
Change-Id: I3f7ba728cef6310d794256e1dc4c28cc33b2f9a3
Reviewed-by: Pasi Keränen <pasi.keranen@digia.com>

5 files changed, 59 insertions, 13 deletions

diff --git a/src/datavisualization/engine/qabstract3dgraph.cpp b/src/datavisualization/engine/qabstract3dgraph.cpp
index 3aada9cf..01974e54 100644
--- a/src/datavisualization/engine/qabstract3dgraph.cpp
+++ b/src/datavisualization/engine/qabstract3dgraph.cpp
@@ -21,6 +21,7 @@
 #include "abstract3dcontroller_p.h"
 #include "qabstract3dinputhandler_p.h"
 #include "q3dscene_p.h"
+#include "qutils.h"
 
 #include <QGuiApplication>
 #include <QOpenGLContext>
@@ -65,19 +66,15 @@ QAbstract3DGraph::QAbstract3DGraph(QAbstract3DGraphPrivate *d, const QSurfaceFor
     QSurfaceFormat surfaceFormat;
     if (format) {
         surfaceFormat = *format;
-    } else {
-        surfaceFormat.setDepthBufferSize(24);
+        // Make sure renderable type is correct
 #if !defined(QT_OPENGL_ES_2)
-        surfaceFormat.setSamples(8);
-#endif
-        surfaceFormat.setSwapBehavior(QSurfaceFormat::DoubleBuffer);
-    }
-
-#if !defined(QT_OPENGL_ES_2)
-    surfaceFormat.setRenderableType(QSurfaceFormat::OpenGL);
+        surfaceFormat.setRenderableType(QSurfaceFormat::OpenGL);
 #else
-    surfaceFormat.setRenderableType(QSurfaceFormat::OpenGLES);
+        surfaceFormat.setRenderableType(QSurfaceFormat::OpenGLES);
 #endif
+    } else {
+        surfaceFormat = qDefaultSurfaceFormat();
+    }
 
     d_ptr->m_context = new QOpenGLContext(this);
     setSurfaceType(QWindow::OpenGLSurface);
diff --git a/src/datavisualization/global/datavisualizationglobal_p.h b/src/datavisualization/global/datavisualizationglobal_p.h
index 86b454c9..8ff36a90 100644
--- a/src/datavisualization/global/datavisualizationglobal_p.h
+++ b/src/datavisualization/global/datavisualizationglobal_p.h
@@ -59,4 +59,4 @@ static const GLfloat gradientTextureWidth = 2.0f;
 
 QT_DATAVISUALIZATION_END_NAMESPACE
 
-#endif // DATAVISUALIZATIONGLOBAL_P_H
+#endif
diff --git a/src/datavisualization/global/qdatavisualizationglobal.h b/src/datavisualization/global/qdatavisualizationglobal.h
index 1c118664..a125e4b2 100644
--- a/src/datavisualization/global/qdatavisualizationglobal.h
+++ b/src/datavisualization/global/qdatavisualizationglobal.h
@@ -64,4 +64,4 @@
 #  define QT_DATAVISUALIZATION_USE_NAMESPACE
 #endif
 
-#endif // QVIS3DGLOBAL_H
+#endif
diff --git a/src/datavisualization/utils/qutils.h b/src/datavisualization/utils/qutils.h
new file mode 100644
index 00000000..9ae66e6b
--- /dev/null
+++ b/src/datavisualization/utils/qutils.h
@@ -0,0 +1,48 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 Digia Plc
+** All rights reserved.
+** For any questions to Digia, please use contact form at http://qt.digia.com
+**
+** This file is part of the QtDataVisualization module.
+**
+** Licensees holding valid Qt Enterprise licenses may use this file in
+** accordance with the Qt Enterprise License Agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia.
+**
+** If you have questions regarding the use of this file, please use
+** contact form at http://qt.digia.com
+**
+****************************************************************************/
+
+#ifndef QUTILS_H
+#define QUTILS_H
+
+#include <QtGui/QSurfaceFormat>
+
+namespace QtDataVisualization {
+
+inline static QSurfaceFormat qDefaultSurfaceFormat(bool antialias = true)
+{
+    QSurfaceFormat surfaceFormat;
+
+    surfaceFormat.setDepthBufferSize(24);
+    surfaceFormat.setSwapBehavior(QSurfaceFormat::DoubleBuffer);
+#if !defined(QT_OPENGL_ES_2)
+    surfaceFormat.setRenderableType(QSurfaceFormat::OpenGL);
+#else
+    // Antialias not supported for ES
+    antialias = false;
+    surfaceFormat.setRenderableType(QSurfaceFormat::OpenGLES);
+#endif
+
+    if (antialias)
+        surfaceFormat.setSamples(8);
+
+    return surfaceFormat;
+}
+
+}
+
+#endif
diff --git a/src/datavisualization/utils/utils.pri b/src/datavisualization/utils/utils.pri
index cef5ebf0..8ce8794e 100644
--- a/src/datavisualization/utils/utils.pri
+++ b/src/datavisualization/utils/utils.pri
@@ -6,7 +6,8 @@ HEADERS += $$PWD/meshloader_p.h \
            $$PWD/texturehelper_p.h \
            $$PWD/utils_p.h \
            $$PWD/abstractobjecthelper_p.h \
-           $$PWD/surfaceobject_p.h
+           $$PWD/surfaceobject_p.h \
+           $$PWD/qutils.h
 
 SOURCES += $$PWD/meshloader.cpp \
            $$PWD/vertexindexer.cpp \