c2ec20b226
The native WebGL context is tied to a single canvas, and can only be used with that canvas. (Qt creates one canvas per QPlatformWindow). This means that we need new native contexts in cases where a QWindow is repeatedly created and destroyed. It can be tempting to just create a new WebGL context "behind the scenes" on the makeCurrent() call in this case, but this does not work since GL resources created by user code with the original WebGL context in place are now invalid. Inform user code that this has happened by signaling a context loss. This is done by returning false from makeCurrent(), and then making sure isValid() returns false as well. The context becomes invalid whenever the owning platform window is destroyed; add a call from ~QWasmWindow() which handles that bookkeeping. Pick-to: 6.10 Task-number: QTBUG-120138 Change-Id: I929b9bb51153007c16630b1a991399f01ebffa62 Reviewed-by: Morten Johan Sørvig <morten.sorvig@qt.io>