Use QSurfaceFormat::defaultFormat for sample count

Enabling multisample in Scene3D currently uses a hardcoded number of
4 samples. This change uses QSurfaceFormat::defaultFormat().samples()
if this is different from -1, and 4 otherwise.

Change-Id: I9c0ab8beb056b435c9d1a80c5f35a44dc67d66e6
Reviewed-by: Paul Lemire <paul.lemire@kdab.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/src/quick3d/imports/scene3d/scene3drenderer.cpp b/src/quick3d/imports/scene3d/scene3drenderer.cpp
index a8684f329..86f8a7681 100644
--- a/src/quick3d/imports/scene3d/scene3drenderer.cpp
+++ b/src/quick3d/imports/scene3d/scene3drenderer.cpp
@@ -143,7 +143,10 @@ QOpenGLFramebufferObject *Scene3DRenderer::createMultisampledFramebufferObject(c
 {
     QOpenGLFramebufferObjectFormat format;
     format.setAttachment(QOpenGLFramebufferObject::CombinedDepthStencil);
-    format.setSamples(4);
+    int samples = QSurfaceFormat::defaultFormat().samples();
+    if (samples == -1)
+        samples = 4;
+    format.setSamples(samples);
     return new QOpenGLFramebufferObject(size, format);
 }