Quasi-support for offscreen surface on WASM

Since context sharing is not currently supported with WebGL, offscreen
contexts have a limited usability on Qt for WASM.

If a context is shared, use the same underlaying WebGL context so that
the two can actually share resources. This is not full-blown context
sharing by any means but it makes e.g. the Open GL widget work as the
readback texture for it is 'shared' between the virtual Qt contexts.

If no sharing is desired, we use an OffscreenCanvas and actually create
a separate WebGL context.

Fixes: QTBUG-107558
Pick-to: 6.5
Change-Id: If57e44739ddb57c167d5f8881a74d8dee52531f6
Reviewed-by: Mikołaj Boc <Mikolaj.Boc@qt.io>

1 files changed, 9 insertions, 1 deletions

diff --git a/src/plugins/platforms/wasm/qwasmoffscreensurface.h b/src/plugins/platforms/wasm/qwasmoffscreensurface.h
index 88a64b775a..38a991f4ce 100644
--- a/src/plugins/platforms/wasm/qwasmoffscreensurface.h
+++ b/src/plugins/platforms/wasm/qwasmoffscreensurface.h
@@ -6,6 +6,10 @@
 
 #include <qpa/qplatformoffscreensurface.h>
 
+#include <emscripten/val.h>
+
+#include <string>
+
 QT_BEGIN_NAMESPACE
 
 class QOffscreenSurface;
@@ -14,8 +18,12 @@ class QWasmOffscreenSurface final : public QPlatformOffscreenSurface
 public:
     explicit QWasmOffscreenSurface(QOffscreenSurface *offscreenSurface);
     ~QWasmOffscreenSurface() final;
-private:
 
+    const std::string &id() const { return m_specialTargetId; }
+
+private:
+    std::string m_specialTargetId;
+    emscripten::val m_offscreenCanvas;
 };
 
 QT_END_NAMESPACE