Provide a default SurfaceFormat for our Context

Since we are not using OpenGL the content of the SurfaceFormat does not
matter to us.  Instead it gives us a way to expose the fact that we are
rendering to a raster surface.  Using the OpenGLInfo API from QML allows
you to check the properties of the SurfaceFormat and see that the
QSurfaceFormat::RenderableType is not OpenGL or OpenGLES.

Change-Id: Iac087dd89115f3455b4fb1941385352cadd2a364
Reviewed-by: Lars Knoll <lars.knoll@digia.com>

2 files changed, 10 insertions, 2 deletions

diff --git a/softwarecontext/context.cpp b/softwarecontext/context.cpp
index 6b72bbfaad..33dc7e87e4 100644
--- a/softwarecontext/context.cpp
+++ b/softwarecontext/context.cpp
@@ -164,6 +164,15 @@ QSGLayer *Context::createLayer(QSGRenderContext *renderContext)
     return new SoftwareLayer(renderContext);
 }
 
+QSurfaceFormat Context::defaultSurfaceFormat() const
+{
+    QSurfaceFormat format = QSurfaceFormat::defaultFormat();
+    format.setRenderableType(QSurfaceFormat::DefaultRenderableType);
+    format.setMajorVersion(0);
+    format.setMinorVersion(0);
+    return format;
+}
+
 void RenderContext::initialize(QOpenGLContext *context)
 {
     Q_UNUSED(context)
diff --git a/softwarecontext/context.h b/softwarecontext/context.h
index 0e685fdfa9..88fe4e447f 100644
--- a/softwarecontext/context.h
+++ b/softwarecontext/context.h
@@ -90,8 +90,7 @@ public:
     virtual QSGGlyphNode *createGlyphNode(QSGRenderContext *rc, bool preferNativeGlyphNode);
     virtual QSGNinePatchNode *createNinePatchNode();
     virtual QSGLayer *createLayer(QSGRenderContext *renderContext);
-
-private:
+    virtual QSurfaceFormat defaultSurfaceFormat() const;
 };
 
 } // namespace