Transfers gpu buffer data to cpu

Added some code to retrieve the data in the gpu back to a cpu pointer
in the opengl helpers.

Added a framegraph node which specifies if any data must be downloaded
from the gpu

Added a flag in the buffer object to specify if the data from that
buffer must be downloaded.

Added a job to send the data back to the frontend.

Added a path in the renderer to download the gpu data.

Task number: QTBUG-57727

Change-Id: I315a9221e5116c7d07f818e00c654fe1901144f4
Reviewed-by: Sean Harmer <sean.harmer@kdab.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/src/render/framegraph/framegraphnode_p.h b/src/render/framegraph/framegraphnode_p.h
index ccdc47f12..c7b399f89 100644
--- a/src/render/framegraph/framegraphnode_p.h
+++ b/src/render/framegraph/framegraphnode_p.h
@@ -98,6 +98,7 @@ public:
         ComputeDispatch,
         Surface,
         RenderCapture,
+        BufferCapture,
         MemoryBarrier
     };
     FrameGraphNodeType nodeType() const { return m_nodeType; }