4b6b601638
The default implementation of the virtual is of course just memcopying into beginFullDynamicBufferUpdateForCurrentFrame()'s result, so not very useful for any backend except OpenGL where (for non-uniform buffers) it is implemented rather with glBufferSubData (leaving it up to the OpenGL implementation what's going to happen internally). The value is somewhat limited in practice, however one user is going to be Qt Quick: to get as identical as possible results to Qt 5 in artificial "benchmark" scenes, it becomes important to go directly to glBufferSubData (just as Qt 5 did) when updating geometry for a large number of items in every frame, and skip any intermediate resource update logic. Task-number: QTBUG-125087 Change-Id: I780a1431e021b90590b493e1fb82334cd71bd75b Reviewed-by: Andy Nichols <andy.nichols@qt.io> (cherry picked from commit cdaa4c317cf1969330e3ad148e7cb0a7cb01d859) Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>