diff options
| author | Mikolaj Boc <mikolaj.boc@qt.io> | 2022-11-28 16:35:24 +0100 |
|---|---|---|
| committer | Mikolaj Boc <mikolaj.boc@qt.io> | 2023-01-30 20:10:25 +0100 |
| commit | 0eea2238f37a5eaa83ada6cd262eceaed20e415c (patch) | |
| tree | 02f88e6033c5bb4ef08ebe4bc88b932725a576f4 /src/plugins/platforms/wasm/qwasmoffscreensurface.cpp | |
| parent | 39daa368d47bc676efb19a8e7478ef1c270ae959 (diff) | |
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: MikoĊaj Boc <Mikolaj.Boc@qt.io>
Diffstat (limited to 'src/plugins/platforms/wasm/qwasmoffscreensurface.cpp')
| -rw-r--r-- | src/plugins/platforms/wasm/qwasmoffscreensurface.cpp | 19 |
1 files changed, 17 insertions, 2 deletions
diff --git a/src/plugins/platforms/wasm/qwasmoffscreensurface.cpp b/src/plugins/platforms/wasm/qwasmoffscreensurface.cpp index 31adc73cf5f..0191e0b2165 100644 --- a/src/plugins/platforms/wasm/qwasmoffscreensurface.cpp +++ b/src/plugins/platforms/wasm/qwasmoffscreensurface.cpp @@ -6,10 +6,25 @@ QT_BEGIN_NAMESPACE QWasmOffscreenSurface::QWasmOffscreenSurface(QOffscreenSurface *offscreenSurface) - :QPlatformOffscreenSurface(offscreenSurface) + : QPlatformOffscreenSurface(offscreenSurface), m_offscreenCanvas(emscripten::val::undefined()) { + const auto offscreenCanvasClass = emscripten::val::global("OffscreenCanvas"); + // The OffscreenCanvas is not supported on some browsers, most notably on Safari. + if (!offscreenCanvasClass) + return; + + m_offscreenCanvas = offscreenCanvasClass.new_(offscreenSurface->size().width(), + offscreenSurface->size().height()); + + m_specialTargetId = std::string("!qtoffscreen_") + std::to_string(uintptr_t(this)); + + emscripten::val::module_property("specialHTMLTargets") + .set(m_specialTargetId, m_offscreenCanvas); } -QWasmOffscreenSurface::~QWasmOffscreenSurface() = default; +QWasmOffscreenSurface::~QWasmOffscreenSurface() +{ + emscripten::val::module_property("specialHTMLTargets").delete_(m_specialTargetId); +} QT_END_NAMESPACE |