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Fix error when deleting web item

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This commit is contained in:
Brad Davis 2015-05-13 11:58:18 -07:00
parent 9b6c20d93c
commit ad5f1214bf
2 changed files with 23 additions and 9 deletions
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29
libraries/entities-renderer/src/RenderableWebEntityItem.cpp
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@ -39,11 +39,21 @@ RenderableWebEntityItem::~RenderableWebEntityItem() {
if (_webSurface) {
_webSurface->pause();
_webSurface->disconnect(_connection);
if (_texture) {
_webSurface->releaseTexture(_texture);
_texture = 0;
}
_webSurface.clear();
// After the disconnect, ensure that we have the latest
_textureLock.lock();
_textureLock.unlock();
// The lifetime of the QML surface MUST be managed by the main thread
// Additionally, we MUST use local variables copied by value, rather than
// member variables, since they would implicitly refer to a this that
// is no longer valid
auto webSurface = _webSurface;
auto texture = _texture;
AbstractViewStateInterface::instance()->postLambdaEvent([webSurface, texture] {
if (texture) {
webSurface->releaseTexture(texture);
}
webSurface->deleteLater();
});
}
}
@ -51,16 +61,19 @@ void RenderableWebEntityItem::render(RenderArgs* args) {
QOpenGLContext * currentContext = QOpenGLContext::currentContext();
QSurface * currentSurface = currentContext->surface();
if (!_webSurface) {
_webSurface = QSharedPointer<OffscreenQmlSurface>(new OffscreenQmlSurface());
_webSurface = new OffscreenQmlSurface();
_webSurface->create(currentContext);
_webSurface->setBaseUrl(QUrl::fromLocalFile(PathUtils::resourcesPath() + "/qml/"));
_webSurface->load("WebEntity.qml");
_webSurface->resume();
updateQmlSourceUrl();
_connection = QObject::connect(_webSurface.data(), &OffscreenQmlSurface::textureUpdated, [&](GLuint textureId) {
_connection = QObject::connect(_webSurface, &OffscreenQmlSurface::textureUpdated, [&](GLuint textureId) {
_webSurface->lockTexture(textureId);
assert(!glGetError());
std::swap(_texture, textureId);
// TODO change to atomic<GLuint>?
withLock(_textureLock, [&] {
std::swap(_texture, textureId);
});
if (textureId) {
_webSurface->releaseTexture(textureId);
}

3
libraries/entities-renderer/src/RenderableWebEntityItem.h
View file

@ -28,9 +28,10 @@ public:
private:
void updateQmlSourceUrl();
QSharedPointer<OffscreenQmlSurface> _webSurface;
OffscreenQmlSurface* _webSurface;
QMetaObject::Connection _connection;
uint32_t _texture{ 0 };
QMutex _textureLock;
};