Method grab

Source/Node/Node.cpp:1663–1733

}

void Node::Grabber::grab(Node* target) {
	float width = std::floor(target->getWidth()); // init RT with integer size
	float height = std::floor(target->getHeight());

	AssertIf(width <= 0.0f || height <= 0.0f, "can not grab a node with size [{}x{}].", width, height);

	size_t rtCount = 1;
	if (_effect) {
		for (Pass* pass : _effect->getPasses()) {
			if (pass->isGrabPass()) {
				rtCount = 2;
				break;
			}
		}
	}
	if (rtCount < _renderTargets.size()) {
		for (size_t i = rtCount; i < _renderTargets.size(); i++) {
			_renderTargets.pop_back();
		}
	} else {
		for (size_t i = _renderTargets.size(); i < rtCount; i++) {
			_renderTargets.push_back(newRenderPair(width, height));
		}
	}
	for (size_t i = 0; i < _renderTargets.size(); i++) {
		const auto& rt = _renderTargets[i];
		if (rt.surface->getWidth() != width || rt.surface->getHeight() != height) {
			_renderTargets[i] = newRenderPair(width, height);
		}
		_renderTargets[i].surface->getEffect()->clear();
	}

	SharedView.pushInsertionMode(true, [&]() {
		target->markDirty();
		target->_flags.setOn(Node::IgnoreLocalTransform);
		_renderTargets[0].rt->setCamera(_camera);
		_renderTargets[0].rt->renderWithClear(target, _clearColor);
		_renderTargets[0].rt->setCamera(nullptr);
		target->_flags.setOff(Node::IgnoreLocalTransform);
		target->markDirty();

		size_t rtIndex = 0;
		if (_effect) {
			for (Pass* pass : _effect->getPasses()) {
				Effect* effect = _renderTargets[rtIndex].surface->getEffect();
				effect->add(pass);
				if (pass->isGrabPass()) {
					Sprite* surface = _renderTargets[rtIndex].surface;
					rtIndex = (rtIndex + 1) % 2;
					surface->setPosition({width / 2.0f, height / 2.0f});
					surface->setBlendFunc({BlendFunc::One, BlendFunc::Zero});
					_renderTargets[rtIndex].rt->render(surface);
					surface->getEffect()->clear();
					_renderTargets[rtIndex].surface->getEffect()->clear();
				}
			}
		}